New application of corn distillers dried grains and soluble substances thereof, laying duck feed and salted eggs

Abstract

The invention belongs to the field of feed, and discloses application of corn distillers' grains and soluble substances thereof as a laying duck feed additive for reducing the malondialdehyde content of yolk of duck eggs, the corn distillers' grains and the soluble substances thereof are used as the feed additive, the malondialdehyde content of the yolk in fresh duck eggs can be reduced in a positive correlation manner, and the malondialdehyde content of the yolk of the duck eggs can be reduced. Furthermore, the hard heart rate of the salted eggs is reduced, and meanwhile, the elasticity, the stickiness and the chewiness of the salted eggs can be improved. Meanwhile, the invention further provides laying duck feed and salted eggs.

Description

Technical Field

[0001] The present invention belongs to the field of feeds, and particularly relates to a new use of corn distillers dried grains with solubles, a feed for laying ducks, and salted eggs. Background Art

[0002] The applicant previously applied for a patent application with a publication number of CN118402602A, and the theme is the pickling materials, the pickling method of salted eggs, salted eggs, and the new use of procyanidins. It discloses that the pickling materials for pickling salted eggs contain antioxidants, and the content of procyanidins in the pickling solution is 0.01 wt% - 0.05 wt%.

[0003] Procyanidins significantly contribute to the hard core of salted eggs. Compared with the blank group, it can reduce the hard core rate by 50% or more.

[0004] In the further research of the applicant, it is found that the influence on the hard core of salted eggs is not only the influence of the pickling solution, but also includes various factors, such as:

[0005] The pickling method and the performance of fresh duck eggs themselves; existing research has proved that the sulfur content in duck eggs increases, the iron content is positively correlated with the degree of yolk black circles, and selenium and vitamin E in the feed can reduce the hard core rate of salted duck yolks.

[0006] Therefore, in order to further improve the quality of salted eggs in this case, the quality of salted eggs is improved through other non - pickling solution ways. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a new use of corn distillers dried grains with solubles. When corn distillers dried grains with solubles (DDGS) are used as a feed additive, it can positively reduce the content of malondialdehyde in the egg yolk of fresh duck eggs, thereby reducing the hard core rate of salted eggs, and at the same time can improve the elasticity, adhesiveness and chewiness of salted eggs.

[0008] At the same time, the present invention also provides a feed for laying ducks and salted eggs.

[0009] To achieve the purpose of this invention, the following technical solutions are adopted:

[0010] Use corn distillers dried grains with solubles as a feed additive for laying ducks to reduce the content of malondialdehyde in the egg yolk of duck eggs.

[0011] Corn distillers grains are a very common feed raw material. Specifically, it can be seen in patent applications such as CN109007320A, a corn distillers grains feed and its preparation method; CN109511789A, a preparation method of a cattle feed containing corn distillers grains, etc.

[0012] In poultry farming, the following documents can be seen: CN110583897A, a chicken feed containing corn distillers grains and its preparation method and feeding method; CN111602748A, a compound feed for meat ducks that reduces the proportion of weak ducks under restricted feeding conditions. Among them, in patent applications such as CN107821844A, a feed for improving duck egg quality and its preparation method; CN104642816A, a feed for preventing egg drop syndrome in laying ducks, etc., most of them use corn distillers grains as ordinary feed, which can only improve the egg production rate, nutrient utilization rate, etc.

[0013] Through in-depth research of the present invention, it is found that using DDGS as a feed additive can significantly reduce the malondialdehyde content in the egg yolks of duck eggs. Using the fresh duck eggs obtained based on this use to prepare salted eggs can significantly reduce the hardening rate.

[0014] Meanwhile, the present invention also discloses a feed for laying ducks, which contains 14wt% - 20wt% of corn dried distillers grains and solubles.

[0015] In addition, the present invention also discloses a salted egg. The laying ducks are fed with the feed for laying ducks as described above, the duck eggs produced by the laying ducks are collected, and the salted eggs are obtained by pickling the duck eggs.

[0016] In the above-mentioned salted eggs, the malondialdehyde content in the egg yolks of the duck eggs is 2.0 - 2.8 mmol / g.

[0017] In the above-mentioned salted eggs, the malondialdehyde content in the egg yolks of the duck eggs is 2.05 - 2.25 mmol / g.

[0018] In the above-mentioned salted eggs, the duck eggs are pickled in a pickling solution;

[0019] The pickling solution contains 0 - 0.02wt% of curcumin.

[0020] More specifically, the general composition of the pickling solution of the present invention is: 20% brine added with 0 - 0.02wt% of curcumin additive

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention discloses the use of corn dried distillers grains and solubles (DDGS) as a feed additive, which can positively reduce the malondialdehyde content in the egg yolks of fresh duck eggs, thereby reducing the hardening rate of salted eggs. At the same time, it can improve the elasticity, adhesiveness and chewiness of salted eggs.

[0023] 2. Using the fresh duck eggs obtained based on this use to prepare salted eggs can significantly reduce the hardening rate;

[0024] 3. When used in combination with curcumin, it can further reduce the hardening rate. Detailed implementation manners

[0025] The technical solution of the present invention will be further described below through specific implementation manners. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0026] Example 1

[0027] Experimental design: 756 peak-period laying ducks (25 wk) were randomly selected for the experiment and divided into 9 treatments, with 6 replicates for each treatment and 14 ducks for each replicate. They were fed corn-soybean meal diets (the usage amounts of corn DDGS and brewer's grains were both 0), 14%, 16%, 18%, and 20% corn DDGS and brewer's grains diets. After feeding for 16 weeks, 3 duck eggs were taken from each replicate to measure the malondialdehyde (MDA) content in the fresh egg yolks.

[0028] In this case, corn dried distillers grains with solubles (corn DDGS) and brewer's grains were both purchased from Guangzhou Hope Feed Co., Ltd.; the CP content of corn DDGS was 25.6%, and the CP content of brewer's grains was 26.5%.

[0029] The malondialdehyde level in the egg yolks of fresh duck eggs refers to Table 1;

[0030] Table 1 Effects of dietary addition of different levels of corn DDGS and brewer's grains on the malondialdehyde content in duck egg yolks

[0031]

[0032]

[0033] As can be seen from Table 1, compared with the control group, the addition of corn DDGS and brewer's grains to the diet can reduce the MDA content in fresh duck egg yolks (P<0.05). It shows a linear and quadratic decrease with the increase of corn DDGS (L<0.01, Q<0.05), a linear decrease with the increase of brewer's grains (L<0.05), and the decreasing effect of corn DDGS is significantly better than that of brewer's grains (P<0.01).

[0034] Example 2

[0035] According to the test results of MDA in fresh duck egg yolks, five groups of corn DDGS were selected for salted duck egg pickling experiments. A 5×2 two-factor experiment was used, and the pickling solution was only 20% brine or 20% brine with curcumin (0.02 wt%) added. Each replicate had 40 duck eggs, and there were 6 replicates in each group. Fresh duck eggs were washed, checked for cracks, and placed in a bucket waiting to be pickled. The pickling solution for each group was made into a 20% brine pickling solution by adding 4.2 kg to 16.8 L of water, and 0 - 0.02 wt% of curcumin additive was added. All duck eggs were soaked, sealed with plastic wrap, cooked after 30 days of pickling maturity, and the hard heart rate, hard heart mass ratio, and texture properties of the salted duck egg yolks were measured.

[0036] The hard heart conditions and texture properties of salted duck eggs are referred to Table 2 and Table 3;

[0037] Table 2 Effects of different corn DDGS contents in the diet and curcumin content in the pickling solution on the hard heart mass ratio and hard heart rate of salted duck eggs

[0038]

[0039]

[0040] As can be seen from Table 2, different corn DDGS contents in the diet do not affect the hard heart mass ratio of salted duck eggs, but reduce the hard heart rate. The hard heart rate of the group using 20% corn DDGS is significantly lower than that of the non - used group (P < 0.05). Adding curcumin to the pickling solution significantly reduces the hard heart mass ratio and hard heart rate of salted duck eggs (P < 0.05).

[0041] Table 3 Effects of different corn DDGS contents in the diet and curcumin content in the pickling solution on the texture properties of salted duck egg yolks

[0042]

[0043] As can be seen from Table 3, using different levels of corn DDGS in the diet significantly reduces the hardness, elasticity, adhesiveness, and chewiness of salted duck egg yolks. The hardness of the 20% corn DDGS group is the smallest, the elasticity is the largest, and the adhesiveness and chewiness are the lowest (P < 0.05). Adding curcumin to the pickling solution does not affect the texture properties of salted duck egg yolks (P > 0.05).

[0044] Result analysis:

[0045] 1. As can be seen from Example 1, after using corn DDGS and brewer's grains in raising laying ducks, the malondialdehyde in the fresh duck eggs produced by them both decreases. Among them, corn DDGS causes linear and quadratic decreases, while brewer's grains can only linearly decrease, indicating that the performance of corn DDGS is significantly better than that of brewer's grains;

[0046] 2. As can be seen from Example 2, after the development of duck eggs produced using corn DDGS, their hardening rate decreased significantly; adding curcumin to the pickling solution significantly reduced the hard heart mass ratio and hardening rate of salted duck eggs. In contrast, in terms of texture characteristics, the effect of curcumin was not obvious.

[0047] Based on the above conclusions, it can be seen that using corn DDGS can significantly improve the quality of fresh duck eggs and salted duck eggs.

[0048] The applicant declares that the present invention uses the above embodiments to illustrate the process method of the present invention, but the present invention is not limited to the above process steps, nor does it mean that the present invention must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent substitution of the raw materials selected for the present invention, the addition of auxiliary components, and the selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. Use of corn distillers dried grains with solubles as a feed additive for laying ducks to reduce the malondialdehyde content in the egg yolks of duck eggs.

2. The use according to claim 1, characterized in that, The corn distillers dried grains with solubles are added to the duck feed in an amount not less than 14 wt%.

3. A feed for laying ducks, characterized in that, It contains 14 wt% - 20 wt% of corn distillers dried grains with solubles.

4. A salted duck egg, characterized in that, Feed the laying ducks with the laying duck feed as described in claim 2 or 3, collect the duck eggs produced by the laying ducks, and use these duck eggs for pickling to obtain the salted eggs.

5. The salted duck egg according to claim 4, wherein, The malondialdehyde content in the egg yolks of the duck eggs is 2.0 - 2.8 mmol / g.

6. The salted duck egg according to claim 5, wherein The malondialdehyde content in the egg yolks of the duck eggs is 2.05 - 2.25 mmol / g.

7. The salted duck egg according to claim 5, wherein The duck eggs are pickled in a pickling solution; The pickling solution contains 0 - 0.02 wt% of curcumin.

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