Feed formula for Wenchang chicken and Wenchang chicken feeding method

Abstract

The invention discloses a Wenchang chicken feed formula and a Wenchang chicken feeding method, the Wenchang chicken feed formula comprises a feed formula and a feeding mode, the feed formula comprises corn, rice bran, soybean meal, fish meal, bran, vegetable oil, stone powder, calcium hydrogen phosphate, salt, L-lysine salt, DL-methionine, choline chloride and a premix; the feed formula comprises the following components in percentage by air-dried basis: 69.45%-74.24% of corn, 0-12% of rice bran, 17.29%-1.12% of soybean meal, 2% of fish meal, 5% of bran, 2.91%-1.95% of vegetable oil, 0.82%-0.88% of mountain flour, 0.97%-1% of calcium hydrophosphate, 0.3% of table salt, 0.05%-0.24% of L-lysine salt, 0.11%-0.17% of DL-methionine, 0.1% of choline chloride and 1% of premix. According to the Wenchang chicken feed formula and the Wenchang chicken feeding method, the rice bran is added, the protein content of the rice bran is high, the contents of vitamins and minerals are similar to those of other cake and meal feeds, in addition, the rice bran further contains active substances such as flavonoids and phenols, and the Wenchang chicken feed formula and the Wenchang chicken feeding method are more suitable for improving the Wenchang chicken breeding benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of poultry breeding, in particular to a Wenchang chicken feed formula and a Wenchang chicken breeding method. BACKGROUND

[0002] Wenchang chicken is a specific chicken breed, which belongs to a small meat chicken breed, has a small body size, and most of the feathers are yellow-brown or black-brown, and has a dark feather crest on the head. It is named "Wenchang chicken" because it is originally from Tianci Village, Tanzhou Town, Wenchang City. Since Wenchang chicken is a broiler, it has higher requirements for its abdominal fat rate and meat flavor during breeding.

[0003] In the prior art, a Chinese patent with application number CN202411063075.4 discloses a method for factory breeding of Wenchang chicken, which comprises the following steps: brooding period: the chicken house is disinfected by spraying disinfectant and ventilated, and the bedding is laid. Wenchang chicks hatched for 1-3 days are fed, fed with brooding feed and placed with drinking water. The brooding feed contains 4-6% of additives by weight, and the drinking water contains 20-35% of adjusting agents by weight. Middle chicken period: during the feeding process, middle chicken feed and drinking water are fed. The middle chicken feed contains 8-12% of additives by weight, and the drinking water contains 12-18% of adjusting agents by weight. Large chicken period: during the feeding process, large chicken feed and drinking water are fed. The large chicken feed contains 16-20% of additives by weight, and the drinking water contains 6-9% of adjusting agents by weight. The addition of additives and adjusting agents during different breeding periods during the factory breeding of Wenchang chicken can meet the nutritional needs of Wenchang chicken during different breeding periods, promote growth, improve immunity, reduce the incidence of disease, and improve the quality of factory breeding.

[0004] For example, in the prior art, a Chinese patent with application number CN202011448215.1 discloses a breeding and cultivation method for Wenchang chicken, which comprises the following steps: step (1), building a chicken house; step (2), disinfecting the chicken house; step (3), hatching and vaccination; step (4), chick management; step (5), management of breeding and cultivation of adult chickens. Through detailed management of chicks, scientific control of temperature and humidity, and provision of scientific breeding space density, the environment for the growth of chicks is ensured. The ingredients and proportions of feed are reasonably adjusted, and the feeding and watering time is scientifically managed to ensure the absorption of nutrients by chicks during the growth stage, greatly improving the survival rate of chicks. Through detailed management of breeding and cultivation of adult chickens, reasonable setting of breeding space density, sufficient lighting during the breeding process, and ensuring ventilation effect, reasonable adjustment of feed ingredients and proportions, and detailed management of feeding and watering time, regular disinfection is ensured to ensure the fattening degree of adult chickens.

[0005] For example, in the prior art, a Chinese patent with application number CN202310401062.2 discloses a Wenchang chicken feeding method, which includes the following steps: (1) Chicks feeding stage: 1-12 day-old chicks are fed with chick feed, and 3-5% by weight of mixed material A is mixed in the chick feed; 13-30 day-old chicks are fed with chick feed, and 6-12% by weight of mixed material A is mixed in the chick feed; (2) Pasture stage: chicken chicks from 31 days to 115 days are raised in slope land and under forest, and 15-20% by weight of mixed material B is mixed in the grower feed; (3) Cage raising stage: from 116 days of age, the chickens are raised in cages for intensive and large-scale breeding, and 22-25% by weight of mixed material C is mixed in the grower feed. After 1-2 months of cage feeding, the chickens are sold, and different mixed materials are fed according to different growth stages of the chicks to improve the growth quality of the chicks, which not only improves the appetite of the chicks and increases the feed intake, but also improves the intestinal tract of the grower broiler and improves the digestive absorption capacity of the broiler, and the chickens are quickly marketed.

[0006] In combination with the above materials, it is known that protein feed needs to be added to the feed of Wenchang chicken during breeding, and meal (usually soybean meal) is used to provide the required protein for growth. However, at present, the resources of feed such as soybean meal are in short supply, need to be imported in large quantities, and the price fluctuates greatly, so it is urgent to explore protein feed resources with tropical characteristics to alleviate the shortage of feed resources such as soybean meal and reduce costs and increase efficiency. SUMMARY

[0007] The purpose of the present application is to provide a Wenchang chicken feed formula and a Wenchang chicken feeding method to solve the problem that the feed has little effect on improving the breeding efficiency in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a Wenchang chicken feed formula, comprising: corn, rice bran, soybean meal, fish meal, bran, vegetable oil, stone powder, calcium hydrogen phosphate, salt, L-lysine salt, DL-methionine, choline chloride and premix; The proportion of the feed formula is based on the dry basis: corn 69.45%-74.24%, rice bran 0-20%, soybean meal 17.29%-1.12%, fish meal 2%, bran 5%, vegetable oil 2.91%-1.95%, stone powder 0.82%-0.88%, calcium hydrogen phosphate 0.97%-1%, salt 0.3%, L-lysine salt 0.05%-0.24%, DL-methionine 0.11%-0.17%, choline chloride 0.1%, and premix 1%.

[0009] Further, the premix provides Cu-10mg, Fe-80mg, Mn-60mg, Zn-70mg, I-2mg, Se-0.40mg, VA-10000IU, VD-32000IU, VE-10mg, VB1-2mg, VB2-3mg, VB3-3.50mg, nicotinic acid-15mg, folic acid-0.50mg, pantothenic acid-10mg, biotin-0.15mg, cyanocobalamin-10ug per kg of feed.

[0010] Further, the proportion of rice bran is 15-20%.

[0011] The application also provides a Wenchang chicken breeding method, comprising the following steps: S1, a certain number of Wenchang chickens are selected and randomly divided into multiple treatment groups, each treatment group has the same number of Wenchang chickens with consistent genetic background and similar body weight; S2, the Wenchang chicken feed formula is used to configure feed, and the prepared feed is divided into multiple parts corresponding to the number of treatment groups, and the proportion of rice bran in each part of feed is different; S3, artificial light and natural light are combined, free feeding and drinking are adopted, and routine immunization and breeding management are performed; S4, test records and detection are performed.

[0012] Further, in the S1 step, the Wenchang chickens are randomly divided into 5 treatment groups.

[0013] Further, in the S2 step, the feed is set to 5 parts, and the proportion of rice bran in the 5 parts of feed is 0%, 5%, 10%, 15% and 20% respectively.

[0014] Further, the S4 step comprises the following sub-steps: S41, the weight of the test Wenchang chickens is weighed at the beginning and end of the test, the feed amount and the remaining amount are recorded every day, and the daily weight gain, daily feed intake and feed weight ratio are calculated; S42, after the test, the same number and similar weight of Wenchang chickens are selected from each treatment group and slaughtered according to the specified requirements, including measuring the abdominal fat and calculating the abdominal fat rate; S43, the stomach of the slaughtered Wenchang chicken is taken out, excess water and blood are absorbed with filter paper, and the weight is weighed after removing excess tissue and fat, and the stomach index is obtained; S44, the meat quality and nutrient content are detected and calculated to obtain the test results.

[0015] Compared with the prior art, the Wenchang chicken feed formula and the Wenchang chicken breeding method have the following beneficial effects: 1. Adding an appropriate amount of rice bran to replace soybean meal and corn is more suitable for improving the breeding efficiency of Wenchang chickens because rice bran has high nutritional value. The protein content of defatted rice bran is as high as 15.10%, which is a rich and inexpensive plant protein resource. The vitamin and mineral content of rice bran is similar to that of other oilseed cakes and meals. In addition, rice bran also contains active substances such as flavonoids and phenols. Furthermore, the intramuscular fat content directly affects the flavor of the muscle. Muscle with a higher crude fat content has a better flavor. Inosinic acid is generally considered to be a determining factor in the flavor of meat products and directly affects the sensory experience of consumers. This study shows that the inosinic acid content of the 20% group of Wenchang chickens was significantly higher than that of the group without added rice bran, and the intramuscular fat content was also higher, which is beneficial to improving the flavor of the leg muscle and making the leg muscle flavor better.

[0016] 2. Fatty acids play an important role in the flavor of meat. The rich unsaturated fatty acids in chicken can make it taste delicious and have high nutritional value. This study found that adding rice bran can significantly increase the content of γ-linolenic acid methyl ester and docosahexaenoic acid methyl ester in Wenchang chicken leg muscle, thereby increasing the nutritional value and delicious taste of the leg muscle. Furthermore, amino acids are the building blocks of proteins, and their composition and content in meat represent the quality of meat protein. In addition, the content of amino acids also plays an important role in the flavor of meat. For example, arginine and leucine give meat a bitter taste, alanine and glycine give meat a sweet taste, and glutamic acid and aspartic acid give meat a umami taste. This feeding study shows that adding rice bran significantly increases the levels of total amino acids, essential amino acids, and sweet amino acids in Wenchang chicken muscle, thereby improving protein quality and enhancing muscle flavor. Attached Figure Description

[0017] Figure 1 This is a table showing the composition and nutrient levels of the experimental diets for this invention; Figure 2 This is a comparative table showing the effects of different levels of rice bran addition on the growth performance of Wenchang chickens according to the present invention; Figure 3 Comparative table of the effects of adding different levels of rice bran on abdominal fat percentage and gastric index of Wenchang chicken in this invention; Figure 4 This is a comparative table showing the effects of different levels of rice bran on the amino acid content of Wenchang chicken breast muscle. Figure 5 This is a comparative table showing the effects of different levels of rice bran on the conventional nutritional components and inosinic acid content of Wenchang chicken leg muscle according to the present invention. Figure 6 This is a comparative table showing the effects of different levels of rice bran on fatty acids in the leg muscles of Wenchang chickens. Figure 7 This is a comparative table showing the effects of different levels of rice bran on the amino acids in the breast muscle of Wenchang chicken. Figure 8Table for comparison of effects of different levels of rice bran on amino acids in drumstick of Wenchang chicken of the present application Figure 9 Table for comparison of effects of different levels of rice bran on histological traits of breast muscle of Wenchang chicken of the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] Embodiment one: please refer to Figures 1-4 The present application provides the following technical solution: a feed formula for Wenchang chicken, the feed formula comprising corn, rice bran, soybean meal, fish meal, bran, vegetable oil, stone powder, calcium hydrogen phosphate, salt, L-lysine salt, DL-methionine, choline chloride and premix. The proportions (percentages) of the feed formula on a dry basis are as follows: corn 69.45%-74.24%, rice bran 0-12%, soybean meal 17.29%-1.12%, fish meal 2%, bran 5%, vegetable oil 2.91%-1.95%, stone powder 0.82%-0.88%, calcium hydrogen phosphate 0.97%-1%, salt 0.3%, L-lysine salt 0.05%-0.24%, DL-methionine 0.11%-0.17%, choline chloride 0.1% and premix 1%.

[0020] The premix provides Cu-10 mg, Fe-80 mg, Mn-60 mg, Zn-70 mg, I-2 mg, Se-0.40 mg, VA-10000 IU, VD-32000 IU, VE-10 mg, VB1-2 mg, VB2-3 mg, VB3-3.50 mg, nicotinic acid-15 mg, folic acid-0.50 mg, pantothenic acid-10 mg, biotin-0.15 mg and cyanocobalamin-10 ug per kg of feed. The nutritional levels in the feed formula are as follows: metabolic energy 12.74 MJ / kg, crude protein 15.83%, crude fat 5.87%-6.11%, calcium 0.83%, total phosphorus 0.64%, available phosphorus 0.36%, lysine 0.89%, methionine 0.36%, methionine+cystine 0.60-0.63% and the nutritional levels in the feed formula are calculated values.

[0021] The present application also provides a Wenchang chicken breeding method, comprising the following steps: S1, a certain number of Wenchang chickens are selected and randomly divided into multiple treatment groups, each treatment group having the same number of Wenchang chickens selected with consistent genetic background and similar body weight.

[0022] In the S1 step: the Wenchang chickens are randomly divided into 5 treatment groups.

[0023] S2, using the above-mentioned feed formula for reducing the abdominal fat rate of Wenchang chickens and improving the flavor of meat quality, the feed is configured into multiple portions corresponding to the number of treatment groups, and the rice bran proportion in each portion of the feed is different.

[0024] In the S2 step: the feed is set to 5 portions, and the proportion (percentage) of rice bran in the 5 portions of the feed is 0%, 5%, 10%, 15% and 20% respectively.

[0025] S3, artificial light and natural light are combined, free feeding and drinking water are adopted, and routine immunization and feeding management are carried out.

[0026] In the S3 step, the space layout adopts the ground flat feeding mode, the breeding density is 10-12 per square meter, the breeding field temperature is maintained at 21-24℃, the temperature maintaining mode adopts the combination of heat preservation lamps and cool air, the illumination time is 12-16 hours, the illumination adopts the combination of natural light and artificial light, the immunity selects newcastle disease vaccine, avian influenza vaccine and infectious bursal disease vaccine, the newcastle disease vaccine is injected every 3-6 months, and the avian influenza vaccine is inoculated every 3-4 months.

[0027] S4, test records and detection.

[0028] The S4 step includes the following sub-steps: S41, the weight of the Wenchang chickens is weighed at the beginning and end of the test, the feed amount and the remaining amount are recorded every day, and the daily weight gain, daily feed intake and feed weight ratio are calculated; S42, after the test, the same number and close weight of Wenchang chickens are selected from each treatment group according to the specified requirements for slaughter determination, including determination of abdominal fat and calculation of abdominal fat rate; S43, the stomach of the slaughtered Wenchang chicken is taken out, the excess water and blood are absorbed with filter paper, the excess tissue and fat are removed, and the weight is weighed to obtain the stomach index; S44, the meat quality and nutrient content are detected and calculated to obtain the test results.

[0029] Example two: please refer to Figures 1-9 The breeding test process of the Wenchang chicken feeding method of the present application is as follows: 1. Materials and methods 1.1 Test animals and grouping 500 healthy Wenchang chickens with consistent genetic background and similar weight are selected, and randomly divided into 5 treatment groups, 5 replicates are set in each treatment group, and 20 in each replicate. Different levels (0%, 5%, 10%, 15% and 20%) of rice bran are added to the daily ration.

[0030] 1.2 Diet composition and nutritional level The diet was formulated according to the Poultry Feeding Standard (2004). The nutritional composition and nutritional level are shown in Table 1.

[0031] 1.3 Feeding management Artificial light and natural light were combined. Free access to feed and water was provided. Routine immunization was performed, and other routine feeding management was performed.

[0032] 1.4 Test site The feeding trial was conducted at the Yongfa Research Base of the Institute of Animal Science and Veterinary Medicine, Hainan Academy of Agricultural Sciences.

[0033] 1.5 Test indices 1.5.1 Production performance 1) Growth performance The test chickens were weighed at the beginning and end of the trial. The feed intake and residual feed were recorded daily, and the average daily gain, average daily feed intake, and feed conversion ratio were calculated.

[0034] 2) Slaughter performance At 08:00 on the last day of the trial, two test chickens with similar average body weight were selected from each replicate, and the slaughter was performed according to the requirements specified in the Poultry Growth Performance Nomenclature and Measurement Statistics Method (NY / T 823-2004). The abdominal fat weight was measured, and the abdominal fat rate was calculated.

[0035] 1.5.2 Organ index After the test chickens were slaughtered, the stomach was taken, excess water and blood were absorbed with filter paper, and excess tissue and fat were removed, and the weight was measured.

[0036] Stomach index (g / kg) = Organ weight (g) / Live weight (kg) 1.5.3 Meat quality and nutrient content 1) The pH value, drip loss rate, cooking loss, cooked meat rate, and shear force of the pectoral muscle were measured.

[0037] 2) Muscle nutrient content: The crude protein, intramuscular fat, inosinic acid, fatty acid, and amino acid contents of the pectoral muscle were measured.

[0038] 2) All are calculated values.

[0039] 1.5.4 Muscle fiber morphology After the trial, two pieces of pectoral muscle were taken, fixed with 4% formaldehyde solution for 24 hours, sliced, and stained with HE for light microscopy observation of the tissue morphology, including the pectoral muscle fiber diameter, muscle fiber density, and cross-sectional area.

[0040] 1.6 Data processing The data were analyzed by one-way ANOVA using SAS 8.02 software, and Duncan's multiple comparison was used to determine the differences between means, with P<0.05 being considered significant.

[0041] 2. Results 2.1 Effects of different levels of rice bran on the growth performance of Wenchang chickens 2.1.1 Effects of different levels of rice bran on the growth performance of Wenchang chickens From Figure 2 it can be seen that the final weight of the 5% group was significantly higher than that of the 20% group (P<0.05), while there was no significant difference between the other groups (P>0.05). The average feed intake of the 10%, 15%, and 20% groups was significantly higher than that of the 0% group (P<0.05), while there was no significant difference between the 5% group (P>0.05). The feed conversion rate of the 0%, 5%, and 10% groups was significantly lower than that of the 20% group (P<0.05), while there was no significant difference between the 15% group (P>0.05).

[0042] 2.1.2 Effects of different levels of rice bran on the abdominal fat rate and stomach index of Wenchang chickens From Figure 3 it can be seen that the abdominal fat rate of the 15% group was significantly lower than that of the 0%, 5%, and 10% groups (P<0.05), while there was no significant difference between the 20% group (P>0.05); the abdominal fat rate of the 20% group was also significantly lower than that of the 0% and 10% groups (P<0.05), while there was no significant difference between the 5% group (P>0.05). The stomach index of the 15% and 20% groups was significantly higher than that of the 0% group (P<0.05), while there was no significant difference between the 5% and 10% groups (P>0.05).

[0043] 2.4 Effects of different levels of rice bran on the meat quality and nutrient content of Wenchang chickens 2.4.1 Effects of different levels of rice bran on the meat quality of Wenchang chickens From Figure 4 it can be seen that the redness of the leg muscle of the 15% group was significantly higher than that of the 0%, 5%, 10%, and 20% groups (P<0.05), and the 20% group was also significantly higher than the 10% group (P<0.05), while there was no significant difference between the 0% and 5% groups (P>0.05).

[0044] 2.4.2 Effects of different levels of rice bran on the nutrient content of Wenchang chicken meat From Figure 5 it can be seen that the inosinic acid content of the 15% and 20% groups was significantly higher than that of the 0% group (P<0.05), while there was no significant difference between the 5% and 10% groups (P<0.05). Although there was no significant difference in the intramuscular fat content of the leg muscle of Wenchang chickens among the groups (P>0.05), the content of the 10% group was the highest.

[0045] 2.4.3 Effects of different levels of rice bran on the fatty acid content of the leg muscle of Wenchang chicken From Figure 6 It can be seen that the content of γ-linolenic acid methyl ester and docosahexaenoic acid methyl ester in the 10% group was significantly higher than that in the 0%, 5%, and 15% groups (P < 0.05), and the content of γ-linolenic acid methyl ester in the 10% group was also significantly higher than that in the 20% group, while the content of docosahexaenoic acid methyl ester showed no significant difference (P > 0.05); the content of γ-linolenic acid methyl ester in the 5% group was also significantly higher than that in the 15% group (P < 0.05).

[0046] 2.4.4 Effects of different levels of rice bran on the amino acid content of the muscle of Wenchang chicken From Figure 7 It can be seen that the total amino acid content, essential amino acid content, EAA / TAA ratio, and sweet amino acid content of the breast muscle in the rice bran groups were significantly higher than those in the control group (P < 0.05) and increased with the increase of the rice bran addition level.

[0047] From Figure 8 It can be seen that the total amino acid content, essential amino acid content, EAA / TAA ratio, and sweet amino acid content of the leg muscle in the rice bran groups were significantly higher than those in the control group (P < 0.05) and increased with the increase of the rice bran addition level.

[0048] 2.5 Effects of different levels of rice bran on the muscle fiber morphology of Wenchang chicken From Figure 9 It can be seen that the fiber diameter of the breast muscle in the 20% rice bran group was significantly lower than that in the 0%, 5%, 10%, and 15% groups (P < 0.05), and that in the 10% group was also significantly lower than that in the 0% group (P < 0.05), while there was no significant difference among the 0%, 5%, and 15% groups (P > 0.05); the average cross-sectional area of the breast muscle in the 10%, 15%, and 20% groups was significantly lower than that in the 5% group (P < 0.05), while there was no significant difference with the 0% group (P > 0.05); although there was no significant difference in the muscle fiber density among the groups (P > 0.05), the muscle fiber density in the 15% group was relatively large.

[0049] 3. Discussion 3.1 Effects of different levels of rice bran on the growth performance of Wenchang chicken As chicken feed, rice bran contains high protein and amino acid content, and is rich in B vitamins, mineral elements and fatty acids required by chickens daily. Zhang et al. (2021) found that replacing corn with different levels (0%, 15%, and 30%) of rice bran could linearly reduce the final weight, weight gain, and weight gain ratio of broilers. This study showed that as the level of rice bran added increased, the final weight and daily weight gain of Wenchang chickens first increased and then decreased, while the feed conversion ratio first decreased and then increased, which was inconsistent with the above report, which may be related to the different animal varieties, feeding conditions, and rice bran design gradients. This study also found that the addition of rice bran increased the average feed intake of Wenchang chickens, which was consistent with the results of Sun Xiwens research, which used 15% rice bran to replace corn to feed chickens, and the chickens' feed intake increased. This may be because rice bran contains a certain amount of dietary fiber, which increases the volume and taste of the feed, thereby stimulating the appetite of the chickens. It has also been reported that the metabolic rate of feed nutrients plays an important role in broiler production, and the level of its metabolic rate directly affects the growth rate and growth performance of broilers. When the crude fiber content in the diet is too high, it will seriously affect the digestibility of other substances, reduce the utilization of feed, and increase the cost of breeding.

[0050] 3.2 Effects of different levels of rice bran on the abdominal fat rate and stomach index of Wenchang chickens The level of abdominal fat rate reflects the amount of fat deposition in animal carcass tissue, which affects animal meat production performance. Experiments have shown that the fat deposition of meat ducks decreases significantly with the increase of dietary fiber level, because the mRNA expression levels of genes related to lipid deposition such as liver fatty acid synthase, acetyl-CoA carboxylase, and active oxygen binding protein-1 are significantly down-regulated with the increase of dietary fiber level. As a biological characteristic index of chickens, organ index can reflect the development status of body system organs, and directly affects the body metabolism level. Studies have shown that fiber can promote the development of gizzard, increase its weight and volume. This study found that with the increase of rice bran addition level, the stomach index first increased and then decreased, and the 15% and 20% groups increased significantly compared with the control group, which was the same as the above research results.

[0051] 3.3 Effects of different levels of rice bran on the meat quality of Wenchang chickens Meat quality is an important indicator for evaluating meat quality. The redness and yellowness values of muscle are closely related to the oxidation-reduction state of myoglobin and the degree of conversion to high iron myoglobin. Chicken muscle is exposed to air after slaughter, and the L* value is high at this time, which is the most preferred by consumers, and the b* value gradually increases with further exposure to air, and the meat color cannot be irreversibly deteriorated

[13] . The higher the a* value and the lower the b* value, the better the meat color of muscle. This study found that the addition of 15% rice bran could significantly increase the redness of Wenchang chicken leg muscle, with the highest brightness and lower yellowness, which improved the meat quality.

[0052] The content of intramuscular fat directly affects the flavor of muscle, and the muscle with high crude fat content has better flavor. Inosinic acid is generally considered to be the determinant of meat product flavor, which directly affects the consumer's sensory experience. This experiment shows that the inosinic acid content of the 20% group is significantly higher than that of the group without rice bran, and the intramuscular fat content is also higher, which is beneficial to improve the flavor of leg muscle and make the leg muscle flavor better.

[0053] Fatty acids play an important role in meat flavor. Studies have shown that the rich unsaturated fatty acids in duck meat can make it delicious and high in nutritional value. This study found that the addition of rice bran can significantly increase the content of γ-linolenic acid methyl ester and docosahexaenoic acid methyl ester in the leg muscle of Wenchang chicken, thereby increasing the nutritional value and delicious taste of the leg muscle.

[0054] Amino acids are the building blocks of proteins, and their composition and content in meat represent the quality of meat protein. In addition, the content of amino acids also plays an important role in meat flavor, such as arginine and leucine imparting bitterness to meat, alanine and glycine imparting sweetness to meat, and glutamic acid and aspartic acid imparting umami to meat. This experiment shows that the addition of rice bran significantly increases the levels of total amino acids, essential amino acids and sweet amino acids in Wenchang chicken muscle, thereby improving protein quality and improving muscle flavor.

[0055] Studies have found that the smaller the muscle fiber diameter, the better the tenderness of the muscle; the larger the muscle fiber area, the worse the water-holding capacity of the muscle. This study found that the muscle fiber diameter of the 20% and 10% groups was significantly lower than that of the non-addition group, and the muscle fiber cross-sectional area was significantly lower than that of the 5% addition group and the non-addition group, indicating that the muscle tenderness and water-holding capacity were better.

[0056] 4. Conclusion The addition of rice bran can reduce the abdominal fat rate of Wenchang chicken, increase the inosinic acid content in muscle, increase the redness of muscle, reduce the content of some saturated fatty acids, and increase the content of total amino acids and essential amino acids, thereby improving meat quality and increasing the nutritional value of Wenchang chicken. It is appropriate to add 15%-20% rice bran.

Claims

1. A feed formulation for broiler chickens, characterized in that, Comprise: corn, rice bran, soybean meal, fish meal, bran, vegetable oil, stone powder, calcium hydrogen phosphate, salt, L-lysine salt, DL-methionine, choline chloride and premix; The proportion of the feed formula is based on the dry basis: corn 69.45%-74.24%, rice bran 0-20%, soybean meal 17.29%-1.12%, fish meal 2%, bran 5%, vegetable oil 2.91%-1.95%, stone powder 0.82%-0.88%, calcium hydrogen phosphate 0.97%-1%, salt 0.3%, L-lysine salt 0.05%-0.24%, DL-methionine 0.11%-0.17%, choline chloride 0.1%, and premix 1%.

2. A feed formulation for Wenchang chicken according to claim 1, characterized in that, The premix provides Cu-10mg, Fe-80mg, Mn-60mg, Zn-70mg, I-2mg, Se-0.40mg, VA-10000IU, VD-32000IU, VE-10mg, VB1-2mg, VB2-3mg, VB3-3.50mg, nicotinic acid-15mg, folic acid-0.50mg, pantothenic acid-10mg, biotin-0.15mg, cyanocobalamin-10ug per kg of feed.

3. A feed formulation for Wenchang chicken according to claim 1, characterized in that, The proportion of the rice bran is 15-20%.

4. A method of raising a chicken as a Silkie, characterized by, Comprise the following steps: S1, select a certain number of Wenchang chicken and randomly divide into multiple treatment groups, each treatment group has the same number, select the same genetic background and similar weight of multiple Wenchang chickens; S2, use the feed formula for Wenchang chicken as claimed in any one of claims 1 to 3 to prepare feed, the prepared feed is divided into multiple parts corresponding to the number of treatment groups, and the proportion of rice bran in each part of the feed is different; S3, adopt artificial light and natural light combination, free feeding and drinking water, routine immunization and feeding management; S4, test recording and detection.

5. The method for raising Wenchang chickens according to claim 4, characterized in that, In S1 step: the Wenchang chicken is randomly divided into 5 treatment groups.

6. The method for raising Wenchang chickens according to claim 5, characterized in that, In S2 step: the feed is set to 5 parts, and the proportion of rice bran in the 5 feeds is 0%, 5%, 10%, 15% and 20% respectively.

7. The method for raising Wenchang chickens according to claim 6, characterized in that, S4 step comprises the following substeps: S41, weigh the test Wenchang chicken at the beginning and end of the test, record the feed amount and remaining amount every day, calculate the daily weight gain, daily feed intake and feed conversion ratio; S42, after the test, select the same number and close weight of Wenchang chicken from each treatment group according to the specified requirements for slaughter determination, including determination of abdominal fat and calculation of abdominal fat rate; S43, take out the stomach of the slaughtered Wenchang chicken, absorb excess water and blood with filter paper, remove excess tissue and fat, weigh, and obtain the stomach index; S44, detect and calculate meat quality and nutrient content to obtain the test results.

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