Feeding method for shortening involution time of uterus of ewe Tibetan sheep

Abstract

The invention discloses a feeding method for shortening the involution time of the uterus of an ewe of Tibetan sheep. The feeding method comprises the steps that the ewe after delivery and lambs are transferred to a special breeding house provided with barriers; all the lambs are transferred into the fences at the first feeding time every day, and the ewes are fed with feed composed of concentrated feed supplements and coarse feed; after the lambs are fed with coarse fodder for a certain period of time, the lambs are released from the barriers, and the lambs and the ewes are driven into the playground together; driving the ewes and the lambs into the special breeding house before the second feeding time every day; all the lambs are transferred into the fences at the second feeding time every day, and the ewes are fed with feed composed of concentrated feed supplements and coarse feed; the lambs are released from the fences after being fed with coarse fodder for a certain period of time; and repeating the steps until the uterus of the ewe is involution. The method has the advantages that the non-pregnant period and the breeding interval of the ewes are shortened, and the breeding rate of the ewes is increased.

Description

Technical Field

[0001] The invention relates to the technical field of Tibetan sheep breeding, and in particular to a breeding method for shortening the uterine involution time of Tibetan sheep ewes. Background Art

[0002] Tibetan sheep, also known as Tibetan sheep, is a dominant local species on the Qinghai-Tibet Plateau. It mainly lives in high-altitude and cold areas with an altitude of more than 3,000 meters and can adapt to the harsh environment of cold, hypoxia, and shortage of forage nutrition in high-altitude and cold areas.

[0003] Tibetan sheep have obvious seasonality in reproduction. Ewes mate in summer and autumn, give birth in winter, and lactate in spring, repeating the cycle, which is manifested as "one birth per year". The gestation period is 5 months, and the empty period is as long as 6 months. Studies have reported that Tibetan sheep are short-day seasonal estrus animals. The shortened daylight hours increase the secretion of melatonin by the pineal gland of Tibetan sheep, which stimulates the gonadotropin-releasing hormone secreted by the hypothalamus to be released in a pulsed manner into the pituitary portal circulation, stimulating the synthesis and release of pituitary follicle-stimulating hormone and luteinizing hormone, regulating the gonads to produce gametes and synthesize gonadal hormones, thereby making the reproductive function of Tibetan sheep excited and vigorous, and completing breeding.

[0004] With the continuous deepening of research on Tibetan sheep ewe reproduction, more and more researchers believe that Tibetan sheep estrus does not entirely depend on the sunshine time, and the nutritional level also greatly affects the estrus and breeding of ewes. Due to the harsh climatic conditions of the Qinghai-Tibet Plateau, the green grass period of pasture is only 3-4 months, while the dry grass period is as long as 8-9 months. The nutrient content of pasture shows periodic changes accordingly, that is, the quality of pasture is good and the nutrient content is high during the green grass period, and vice versa during the dry grass period. The lactation period of Tibetan sheep ewes coincides with the dry grass season, and the nutrient supply of natural pasture pasture is seriously insufficient, resulting in nutritional estrus in ewes after delivery, delayed ovarian cycle function recovery and uterine involution, and prolonged the breeding interval of ewes, resulting in "one birth per year" and poor reproductive performance. At present, it has been reported that the rapid recovery of Tibetan sheep ewes' reproductive function after delivery can be achieved by regulating the amount of concentrate feed, especially the recovery of ovarian cycle function and completion of uterine involution. However, there are still problems such as high unit price of concentrate feed, large feeding amount, and irregular feeding management, which leads to a significant increase in breeding costs.

[0005] Uterine involution refers to the physiological process in which the state and function of the uterus of a female animal after giving birth return to a state similar to that before pregnancy. Studies have shown that appropriate nutritional levels can increase the secretion of reproductive hormones, thereby improving reproductive efficiency; the energy and protein intake of lactating ewes is crucial to their reproductive performance. The appropriate amount of energy and protein intake can increase the level of reproductive hormones, promote uterine involution, and shorten the reproductive interval. It is reported that supplementary feeding during lactation has a significant effect on the reproductive performance of ewes, and can significantly increase the levels of follicle-stimulating hormone (FSH), luteinizing hormone (LH) and estrus conception rate of ewes; supplementary feeding during lactation also has an important effect on uterine involution, which can shorten the time of uterine involution and reduce the incidence of dystocia during delivery. Under natural grassland grazing conditions, supplementary feeding of Tibetan ewes using a breeding model of grazing plus supplementary feeding can promote uterine involution after delivery.

[0006] In summary, all existing studies have explored the effects of supplementary feeding during lactation on uterine involution in ewes, but have not made a clear statement on the effect of nutritional level on uterine involution in ewes. Therefore, in order to shorten the uterine involution time of Tibetan sheep ewes, thereby shortening their empty period and improving their reproductive rate, systematically exploring the effect of nutritional level of Tibetan sheep during lactation on uterine involution has become an effective way to solve the above problems. Summary of the invention

[0007] In view of the deficiencies in the prior art, the object of the present invention is to provide a feeding method for shortening the uterine involution time of Tibetan sheep ewes, shortening the uterine involution time of ewes through nutritional regulation during the lactation period, so that their body condition and reproductive organs can return to normal as soon as possible after parturition, meet the conditions for breeding and conception, thereby shortening the empty period and breeding interval, and improving the reproductive rate of ewes.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A feeding method for shortening the uterine involution time of Tibetan sheep ewes comprises the following steps:

[0010] Step 1: Transfer the ewes and lambs after delivery to a special pen, wherein the special pen is equipped with fences inside and a playground outside;

[0011] Step 2: at the first feeding time of the day, all lambs are transferred to the stalls, and the ewes are fed with a diet consisting of concentrate supplement and roughage. The concentrate supplement is fed first, and the roughage is fed after the concentrate supplement is finished;

[0012] Step 3, after feeding roughage for a certain period of time, the lamb is released from the stall, and is driven into the exercise field together with the ewe, so that the lamb can eat breast milk and follow the ewe's activities;

[0013] Step 4: Drive the ewes and lambs into the special pen before the second feeding time of the day;

[0014] Step 5: At the second feeding time of the day, all lambs are transferred to the stalls, and the ewes are fed with a diet consisting of concentrate supplement and roughage. The concentrate supplement is fed first, and the roughage is fed after the concentrate supplement is finished;

[0015] Step 6: After feeding roughage for a certain period of time, the lambs are released from the stalls to feed on breast milk;

[0016] Step 7: Repeat steps 2 to 6 until the ewe's uterus is restored.

[0017] Furthermore, the raw material composition of the concentrate supplement is as follows by weight percentage: 32% corn, 7% wheat, 30% palm meal, 4% soybean meal, 18% rapeseed meal, 2% cottonseed meal, 1% salt, 1% stone powder, 4% first premix, and 1% second premix.

[0018] Furthermore, the first premix contains NaHCO 3 、CaHPO 4 , glucose, medical stone and ammonium niacin.

[0019] Furthermore, each kilogram of the first premix contains NaHCO 3 85 g, CaHPO 4 85 grams, 500 grams of glucose, 300 grams of medical stone, and 125 mg of ammonium nicotinate.

[0020] Furthermore, the second premix contains CuSO 4 、MnSO 4 、ZnO、Na 2 SeO 3 , Ca(IO 3 ) 2 、CoSO 4 ,VA,VD 3 , VE, antioxidant iron.

[0021] Further, each kilogram of the second premix contains CuSO 4 1.5 g, MnSO 4 4 g, ZnO 5 g, Na 2 SeO 3 1 g, Ca(IO 3 ) 2 1.5g, CoSO 4 0.5g, VA145000IU, VD 3 34000IU, VE 250mg, antioxidant iron 5g.

[0022] Furthermore, the roughage is prepared by mixing oat hay and wheat straw in a ratio of 7:3 based on dry matter weight.

[0023] Furthermore, in step 1, there are no more than 24 ewes in each of the special pens, and the area of ​​the exercise field is not less than 60 square meters.

[0024] Furthermore, the first feeding time is 8:00-8:30 in the morning every day, and the second feeding time is 16:30-17:00 in the afternoon every day.

[0025] Furthermore, in step 3 and step 6, the lambs are released from the stalls after 2 hours of feeding the roughage to feed on breast milk.

[0026] The remarkable effects of the present invention are:

[0027] 1. The feeding method of the present invention shortens the uterine involution time of ewes through nutritional regulation during lactation, so that their body condition and reproductive organs return to normal as soon as possible after delivery, meet the conditions for breeding and conception, thereby shortening the empty period and breeding interval, and improving the reproductive rate of ewes. After using the feeding method of the present invention, Tibetan sheep ewes can complete uterine involution 68 days after delivery, and successfully mate within 1 month after uterine involution, and their empty period can be shortened to 3 months, realizing a balanced production mode of "two years and three productions", and the reproductive rate is increased by 50%.

[0028] 2. Compared with the traditional feeding and management method, the feeding method of the present invention can increase the reproduction rate of ewes by 50%, that is, compared with the traditional feeding and management method, 100 breeding ewes can produce 50 more lambs. If the unit price of lambs after weaning is 500 yuan / head, the income can be increased by 25,000 yuan. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a flow chart of the feeding method of the present invention;

[0030] Figure 2 This is a diagram showing the effect of nutritional levels on the development of ovarian follicles in lactating Tibetan sheep ewes;

[0031] Figure 3 This is an anatomical diagram of the degree of uterine involution of a Tibetan sheep ewe. DETAILED DESCRIPTION

[0032] The specific implementation manner and working principle of the present invention are further described in detail below with reference to the accompanying drawings.

[0033] Embodiment 1:

[0034] This embodiment proposes a concentrate supplement and a preparation process thereof, wherein the raw material composition of the concentrate supplement is as follows by weight percentage: 32% corn, 7% wheat, 30% palm meal, 4% soybean meal, 18% rapeseed meal, 2% cottonseed meal, 1% salt, 1% stone powder, 4% first premix, and 1% second premix.

[0035] Specifically, each kilogram of the first premix contains NaHCO 3 85 g, CaHPO 4 85 g, glucose 500 g, medical stone 300 g, ammonium nicotinate 125 mg; each kilogram of the second premix contains CuSO 4 1.5 g, MnSO 4 4 g, ZnO 5 g, Na 2 SeO 3 1 g, Ca(IO 3 ) 2 1.5g, CoSO 4 0.5g, VA145000IU, VD3 34000IU, VE 250mg, antioxidant iron 5g.

[0036] The composition and nutritional ingredients of the concentrate supplement are shown in Table 1:

[0037] Table 1 Composition and nutritional value of concentrate supplement

[0038]

[0039] Note: Crude protein, crude fat, neutral detergent fiber, acid detergent fiber, calcium and total phosphorus in feed nutrients are measured values, while digestible energy is calculated value.

[0040] The preparation process of the concentrate supplement is as follows:

[0041] Step A, weigh corn, wheat, palm meal, soybean meal, rapeseed meal, and cottonseed meal according to proportion, then crush and stir to mix evenly;

[0042] Step B, adding salt and stone powder in proportion to the crushed material obtained in step A, and stirring and mixing evenly;

[0043] Step C, adding the first premix to the mixture obtained in step B in proportion, stirring and mixing evenly;

[0044] Step D: adding the second premix in proportion to the mixture obtained in step C, stirring and mixing evenly to obtain the concentrate supplement.

[0045] Embodiment 2:

[0046] like Figure 1As shown, a feeding method for shortening the uterine involution time of Tibetan sheep ewes comprises the following steps:

[0047] Step 1, transfer the ewes and lambs after delivery to a special pen, which has three small pens, each of which has 24 ewes, and each small pen has 8 ewes. The special pen is equipped with fences, and a 60-square-meter playground is equipped outside the special pen;

[0048] Step 2: at the first feeding time of each day, all lambs are transferred to the stalls, and a diet consisting of concentrate supplement and roughage is used to feed the ewes, wherein the concentrate supplement is fed first, and then the roughage is fed after the concentrate supplement is finished. In this example, the first feeding time is 8:00-8:30 a.m. every day, and the concentrate supplement is the concentrate supplement described in Example 1;

[0049] Step 3, after feeding the roughage for 2 hours, the lamb is released from the stall, and is driven into the playground together with the ewe, so that the lamb can eat breast milk and follow the ewe's activities;

[0050] Step 4, driving the ewes and lambs into the special pen before the second feeding time of the day, that is, 16:30, the second feeding time is 16:30-17:00 every afternoon;

[0051] Step 5: At the second feeding time of the day, all lambs are transferred to the stalls, and the ewes are fed with a diet consisting of concentrate supplement and roughage. The concentrate supplement is fed first, and the roughage is fed after the concentrate supplement is finished;

[0052] Step 6: After feeding the roughage for 2 hours, the lambs are released from the stalls to feed on breast milk;

[0053] Step 7, repeat step 2 to step 6 until the ewe's uterus is restored, then adopt the grazing plus supplementary feeding feeding management method, put rams in the ratio of ewes to rams at 10:1, and breeding can be completed within 1 month.

[0054] Next, a comparative test was performed on the feeding method described in this embodiment:

[0055] 1. Experimental Animals

[0056] 96 healthy pregnant Tibetan sheep ewes with 3-4 parities, weighing 45-50kg, and expecting to give birth were selected as feeding test animals, and they were randomly divided into 4 groups after giving birth, including a control group, which was fed by the traditional grazing + supplementary feeding method, that is, each ewe was fed 50g of concentrate supplement before grazing at 9:00 in the morning, and then grazed on the pasture, and fed 50g of concentrate supplement after returning to grazing at 17:00 in the afternoon; the other three groups were experimental groups, and were fed according to the method described in Example 2. During the feeding process, drinking water was free and uniform management was carried out.

[0057] 2. Experimental Design

[0058] The control group used commercially available concentrate supplements, and its raw material composition was as follows: 64% corn, 10% wheat, 10% soybean meal, 9% rapeseed meal, 1% salt, 1% stone powder, 1% baking soda, and 4% premix. The experimental diets of the three experimental groups were all composed of concentrate supplements and roughage. The composition and nutrient levels of the concentrate supplements are shown in Table 1. The purpose of adding concentrate supplements to the control group was to simulate the nutritional level of the feed consumed by ewes in the traditional grazing + supplementary feeding method. The purpose of adding concentrate supplements to the three experimental groups was to explore the effects of different nutritional levels on uterine involution under different amounts of concentrate supplements. During the experimental period, the ewes in the experimental group were fed 1.4 kg of roughage (dry matter level, oat hay and wheat straw 7:3 mixture) every day, and the feeding amount of concentrate supplements was 100 g (control group), 440 g (group I), 620 g (group II), and 800 g (group III). The nutritional level of the experimental ewe diet was designed according to the "Standards for Meat Sheep Feeding" (NY / T 816-2004), as shown in Table 2.

[0059] Table 2 Nutritional intake of Tibetan sheep ewes during lactation

[0060]

[0061] Note: The ewes in the control group ate about 1.11 kg (dry matter basis) of natural forage every day. The digestible energy, crude protein, crude fat, neutral detergent fiber, acid detergent fiber, calcium and phosphorus contents in natural forage were 7.56 MJ / kg, 6.9%, 2.2%, 70%, 44%, 0.5% and 0.18%, respectively.

[0062] 3. Feeding and management

[0063] The control group adopted the feeding and management method of grazing + supplementary feeding, and the feeding and management methods of the three experimental groups were the same, as follows:

[0064] After giving birth, the ewes in the experimental group were moved to a special pen with their lambs. Each group had three small pens, and each small pen housed eight ewes.

[0065] After the experiment started, a 3-day pre-feeding period was carried out to allow the ewes to adapt to the diet and recover their body condition as quickly as possible;

[0066] After the pre-feeding period, the formal experiment was carried out. Each group of ewes was fed twice a day (8:00-8:30 and 16:30-17:00), and they were free to drink water all day. Before each feeding, the concentrate and roughage were weighed separately. The concentrate was fed first, and the roughage was fed after the concentrate was finished. Before the next feeding, the leftovers were collected, weighed, and the feed intake was recorded. In order to prevent the lambs from eating the ewe feed, that is, the lambs only ate ewe milk during the experimental period, all special pens were equipped with fences, and the lambs were transferred to the fences before feeding the ewes. 2 hours after the first roughage feeding every day, the lambs are released from the stalls and driven into the exercise field with the ewes to allow them to feed on breast milk and follow the ewes; before the second feeding, the lambs and ewes are driven from the exercise field into the special pen, and after the lambs are driven into the stalls, the ewes are fed; 2 hours after the first roughage feeding every day, the lambs are released from the stalls to allow them to feed on breast milk.

[0067] Each pen is equipped with a 60-square-meter exercise field. The ewes in the three small pens in the same group enter the exercise field in turn for activities. The ewes and lambs enter the exercise field at 10:30 am every day and are driven into the pen before feeding at 16:30 pm to ensure that the ewes have sufficient exercise time every day.

[0068] 4. Sample collection and index testing

[0069] Six Tibetan sheep ewes were selected from each group (two ewes in each pen in the group) and weighed before morning feeding 68 days after parturition (the fourth estrus period after parturition) to calculate their average weight changes during lactation. After slaughter, the uterus and ovaries were removed to observe their recovery. The specific evaluation and measurement methods of the uterus and ovaries are as follows:

[0070] (1) Determination of uterine and ovarian phenotypic indicators

[0071] The uterus was weighed, and the diameter of the uterine body was measured with a vernier caliper. The cervix was then cut open, and the length of the uterine body and uterine horn was measured with a ruler. The diameters of the upper third (close to the fallopian tube), middle and lower third (close to the uterine body) of the pregnant and non-pregnant uterine horns were measured with a vernier caliper. The uterine body and uterine horns were cut open with scissors, photographed, and the recovery of the endometrium was recorded. The ovaries on both sides were weighed, the development of follicles was observed, and the number of follicles and erythroblast formation were recorded.

[0072] (2) Conditions for determining uterine involution:

[0073] Judging the cleanliness of the uterus: Cut open the uterus and observe whether the mucus in the uterus is completely discharged. If the mucus is completely discharged, it means that the uterus has returned to normal.

[0074] Judgment of endometrial color: An uninvolved uterus appears dark brown, while a normally involved uterus appears light brown or flesh-colored.

[0075] Morphology of the uterine caruncle: Observe the shape of the uterine caruncle. If it is full in shape and the center and the surrounding area are the same color, it indicates that the uterus has returned to normal.

[0076] 5. Test results

[0077] (1) Growth indicators of Tibetan sheep ewes during lactation

[0078] As shown in Table 3, the nutritional level during lactation significantly affected the final body weight, average daily weight gain and average dry matter intake of Tibetan sheep ewes (P < 0.05). The final body weight and average daily weight gain of ewes in groups I, II and III were significantly higher than those in the control group (P < 0.05). There were significant differences in the average dry matter intake of ewes in the control group, I, II and III groups (P < 0.05). Among the three experimental groups, only the ewes in group III did not lose weight.

[0079] Table 3 Growth indicators of Tibetan sheep ewes during lactation

[0080]

[0081] Note: Different capital letters and lowercase letters in the same row indicate significant differences (P<0.05), while no capital letters or the same letters indicate no significant differences (P>0.05). The same applies to the following table.

[0082] (2) Effects of nutritional level on ovarian function of lactating Tibetan sheep ewes

[0083] As shown in Table 4, the nutritional level of Tibetan sheep ewes during lactation significantly affected the number of follicles and red bodies (P < 0.05). Among them, the number of red bodies in the ovaries of ewes in groups Ⅰ, Ⅱ, and Ⅲ was significantly higher than that in the control group (P < 0.05), indicating that the ovarian function of ewes in groups Ⅰ, Ⅱ, and Ⅲ had recovered 68 days after delivery.

[0084] Table 4 Recovery of ovarian function of Tibetan sheep during lactation

[0085]

[0086]

[0087] like Figure 2 As shown in the figure, the arrows point to follicles. In this experiment, the number of primary follicles, secondary follicles and mature follicles in the ovaries of Tibetan sheep ewes in each group had no significant difference with the increase of nutritional level during lactation (P>0.05). Figure 2 A shows the primary follicle, with a clear basement membrane separating the follicle from the interstitial cells; Figure 2B shows a secondary follicle with a distinct basement membrane, complete follicular structure and zona pellucida; Figure 2 C shows mature follicles and primary follicles; Figure 2 D shows mature follicles, atretic follicles and secondary follicles.

[0088] (3) Effect of nutritional level on uterine morphological recovery of lactating Tibetan sheep ewes

[0089] As shown in Table 5, the nutritional level of Tibetan sheep ewes in lactation period significantly affected the uterine length, uterine body diameter, lower diameter of pregnant uterine horn, upper diameter of non-pregnant uterine horn, and lower diameter of non-pregnant uterine horn of Tibetan sheep ewes (P < 0.05). Among them, the uterine length of the control group ewes was significantly higher than that of groups Ⅰ, Ⅱ, and Ⅲ (P < 0.05); there were significant differences in uterine body diameter among the four groups (P < 0.05); the lower diameter of the pregnant uterine horn of the control group ewes was significantly higher than that of groups Ⅱ and Ⅲ (P < 0.05); the upper diameter of the non-pregnant uterine horn of the control group ewes was significantly higher than that of group Ⅲ (P < 0.05); the lower diameter of the non-pregnant uterine horn of the ewes in groups Ⅱ and Ⅲ was significantly lower than that of the control group and group Ⅰ (P < 0.05).

[0090] Table 5 Uterine recovery of Tibetan sheep during lactation

[0091]

[0092] (4) Effect of nutritional level on uterine involution in lactating Tibetan sheep ewes

[0093] like Figure 3 As shown, Figure 3 A is an uninvoluted uterus, with a dark brown endometrium and a large amount of undischarged lochia attached to the uterus; Figure 3 B is a basically involuted uterus, with a light brown endometrium, no lochia in the uterus, and most of the uterine caruncle is plump; Figure 3 C is a completely involuted uterus, with flesh-colored endometrium, no lochia in the uterus, and a full uterine caruncle. In this experiment, there were 7 ewes with uninvoluted uterus (6 in the control group and 1 in group I), 16 ewes with basically involuted uterus (5 in group I, 6 in group II, and 5 in group III), and 1 ewe with completely involuted uterus (1 in group IV), and the uterus of ewes in groups II and III was completely involuted.

[0094] In summary, when Tibetan sheep ewes are fed 620g (dry matter basis) of concentrated feed and 1.4kg (dry matter basis) of roughage during their lactation period, their uterus can complete involution and meet the conditions for breeding and conception. If breeding can be completed within 1 month and conception is successful, the empty period of Tibetan sheep ewes will be shortened to within 3 months after delivery.

[0095] Under the traditional feeding method, the empty-stomach period of Tibetan sheep ewes is as long as 150 days, which is manifested as "one birth per year". During the empty-stomach period, farmers and herdsmen usually buy a large amount of concentrated feed supplements and fodder to supplement the ewes. Due to insufficient nutritional levels, the uterine involution time of the ewes is prolonged, the empty-stomach period time increases accordingly, and the breeding cost increases. After using the feeding method of the present invention (i.e., when the ewe is fed 620g of concentrated feed and 1.4kg of roughage), the Tibetan sheep ewes can complete uterine involution 68d after delivery, and can be successfully bred within 1 month after uterine involution, and their empty-stomach period can be shortened to 3 months, realizing the balanced production model of "three productions in two years", and the reproduction rate is increased by 50%.

[0096] Economic benefit analysis found that compared with traditional feeding and management methods, the feeding method of the present invention can increase the reproductive rate of ewes by 50%, that is, compared with the traditional feeding and management method, 100 breeding ewes can produce 50 more lambs. If the unit price of weaned lambs is 500 yuan / head, an additional income of 25,000 yuan can be achieved. At present, there are about 7.8 million breeding Tibetan sheep ewes in Qinghai Province. If the reproductive rate is increased by 50%, 3.9 million more lambs can be produced, which will increase income by 3.9 billion yuan.

[0097] The technical solution provided by the present invention is described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A feeding method for shortening the uterine involution time of Tibetan sheep ewes, characterized in that: The steps include: Step 1: Transfer the ewes and lambs after delivery to a special pen, wherein the special pen is equipped with fences inside and a playground outside; Step 2: at the first feeding time of the day, all lambs are transferred to the stalls, and the ewes are fed with a diet consisting of concentrate supplement and roughage. The concentrate supplement is fed first, and the roughage is fed after the concentrate supplement is finished; Step 3, after feeding roughage for a certain period of time, the lamb is released from the stall, and is driven into the exercise field together with the ewe, so that the lamb can eat breast milk and follow the ewe's activities; Step 4: Drive the ewes and lambs into the special pen before the second feeding time of the day; Step 5: At the second feeding time of the day, all lambs are transferred to the stalls, and the ewes are fed with a diet consisting of concentrate supplement and roughage. The concentrate supplement is fed first, and the roughage is fed after the concentrate supplement is finished; Step 6: After feeding roughage for a certain period of time, the lambs are released from the stalls to feed on breast milk; Step 7: Repeat steps 2 to 6 until the ewe's uterus is restored.

2. The method for shortening the uterine involution time of Tibetan sheep ewes according to claim 1, characterized in that: The raw material composition of the concentrate supplement is as follows by weight percentage: 32% corn, 7% wheat, 30% palm meal, 4% soybean meal, 18% rapeseed meal, 2% cottonseed meal, 1% salt, 1% stone powder, 4% first premix, and 1% second premix.

3. The method for shortening the uterine involution time of Tibetan sheep ewes according to claim 2, characterized in that: The first premix contains NaHCO3, CaHPO4, glucose, medical stone and ammonium nicotinate.

4. The method for shortening the uterine involution time of Tibetan sheep ewes according to claim 3, characterized in that: Each kilogram of the first premix contains 85 grams of NaHCO3, 85 grams of CaHPO4, 500 grams of glucose, 300 grams of medical stone, and 125 milligrams of ammonium nicotinate.

5. The method for shortening the uterine involution time of Tibetan sheep ewes according to claim 1, characterized in that: The second premix contains CuSO4, MnSO4, ZnO, Na2SeO3, Ca(IO3)2, CoSO4, VA, VD3, VE, and antioxidant iron.

6. The method for shortening the uterine involution time of Tibetan sheep ewes according to claim 1, characterized in that: Each kilogram of the second premix contains 1.5 grams of CuSO4, 4 grams of MnSO4, 5 grams of ZnO, 1 gram of Na2SeO3, 1.5 grams of Ca(IO3)2, 0.5 grams of CoSO4, 5000 IU of VA14, 34000 IU of VD3, 250 milligrams of VE, and 5 grams of antioxidant iron.

7. The method for shortening the uterine involution time of Tibetan sheep ewes according to claim 1, characterized in that: The roughage is prepared by mixing oat hay and wheat straw in a ratio of 7:3 based on dry matter weight.

8. The method for shortening the uterine involution time of Tibetan sheep ewes according to claim 1, characterized in that: In step 1, there are no more than 24 ewes in each of the special pens, and the area of ​​the exercise field is not less than 60 square meters.

9. The method for shortening the uterine involution time of Tibetan sheep ewes according to claim 1, characterized in that: The first feeding time is 8:00-8:30 in the morning every day, and the second feeding time is 16:30-17:00 in the afternoon every day.

10. The method for shortening the uterine involution time of Tibetan sheep ewes according to claim 1, characterized in that: In steps 3 and 6, the lambs were released from the stalls 2 hours after feeding the roughage and allowed to feed on breast milk.

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