New use of corn dry vinasse and its soluble, feed for egg duck, salted egg

Abstract

The present application belongs to the field of feed, and discloses a use of corn dry distiller's grains and soluble as a feed additive for reducing the malondialdehyde content of duck egg yolk, the corn dry distiller's grains and soluble (DDGS) is used as a feed additive, which can positively correlate to reduce the malondialdehyde content of duck egg yolk, and further reduce the hard core rate of salted duck egg, and meanwhile, the elasticity, gum adhesion and chewiness of the salted duck egg can be improved. Meanwhile, the present application also provides a feed for laying ducks and a salted duck egg.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of feed, and particularly relates to a new use of corn dry distiller's grains and soluble thereof, a duck egg feed and a salted egg. BACKGROUND

[0002] The applicant previously applied for a patent application with the subject of a pickling material, a pickling method of salted eggs, a salted egg and a new use of proanthocyanidins, and the patent application with the publication number CN118402602A discloses that the pickling material for pickling salted eggs contains an antioxidant, and the content of proanthocyanidins in the pickling liquid is 0.01wt% to 0.05wt%.

[0003] Proanthocyanidins have obvious contribution to the hard core of salted eggs, and can reduce the hard core rate by 50% or more compared with the blank group.

[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 liquid, but also includes various factors, such as:

[0005] The performance of the pickling method and the fresh duck egg itself; the existing research proves that the increase of the sulfur content in the duck egg, the positive correlation between the iron content and the black ring degree of the yolk, and the selenium and vitamin E in the feed can reduce the hard core rate of the yolk of the salted egg.

[0006] Therefore, in order to further improve the quality of the salted egg, the quality of the salted egg is improved through other non-pickling liquid ways. SUMMARY

[0007] In view of the deficiencies of the prior art, the purpose of the present application is to provide a new use of corn dry distiller's grains and soluble thereof, and the corn dry distiller's grains and soluble thereof (DDGS) are used as a feed additive, which can positively reduce the malondialdehyde content of the yolk of the fresh duck egg, and further reduce the hard core rate of the salted egg, and can improve the elasticity, adhesion and chewiness of the salted egg.

[0008] Meanwhile, the present application also provides a duck egg feed and a salted egg.

[0009] In order to achieve the purpose of the present application, the following technical solutions are adopted:

[0010] The corn dry distiller's grains and soluble thereof are used as a duck egg feed additive for reducing the malondialdehyde content of the yolk of the duck egg.

[0011] The corn distiller's grains are a very common feed raw material, and can be seen in the patent applications such as CN109007320A, a corn distiller's grains feed and a preparation method thereof; CN109511789A, a preparation method of a cattle feed containing corn distiller's grains, etc.

[0012] In the poultry breeding, the following documents can be seen: CN110583897A, a chicken feed containing corn distiller's grains and its preparation method and feeding method; CN111602748A, a meat big duck compound feed for reducing the proportion of weak ducks under limited feeding conditions. Among them, in CN107821844A, a feed for improving duck egg quality and its preparation method; CN104642816A, a feed for preventing egg duck egg reduction syndrome, most of which use corn distiller's grains as ordinary feed, which can only improve the egg production rate, feed utilization rate, etc.

[0013] Through the in-depth research of the present application, it is found that the use of DDGS as a feed additive can significantly reduce the malondialdehyde content of duck egg yolk, and the fresh duck eggs obtained based on this use can significantly reduce the hard core rate when used to prepare salted eggs.

[0014] Meanwhile, the present application also discloses a duck feed containing 14wt%-20wt% of corn distiller's grains and its solubles.

[0015] In addition, the present application also discloses a salted egg, which is fed to the duck by using the duck feed as described above, collects the duck eggs produced by the duck, and uses the duck eggs to pickle to obtain the salted egg.

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

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

[0018] In the above-mentioned salted egg, the duck egg is pickled in a pickling liquid;

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

[0020] More specifically, the general composition of the pickling liquid of the present application is: 20% of salt water added with 0-0.02wt% of curcumin additive

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

[0022] 1. The present application discloses the use of corn distiller's grains and its solubles (DDGS) as a feed additive, which can positively correlate to reduce the malondialdehyde content of duck egg yolk in fresh duck eggs, and further reduce the hard core rate of salted eggs, while improving the elasticity, adhesion and chewiness of salted eggs.

[0023] 2. The fresh duck eggs obtained based on this use can significantly reduce the hard core rate when used to prepare salted eggs;

[0024] 3. When used together with curcumin, the hard core rate can be further reduced. Detailed Implementation

[0025] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0026] Example 1

[0027] Experimental Design: 756 peak-laying ducks (25 weeks old) were randomly selected and divided into 9 treatments, with 6 replicates per treatment and 14 ducks per replicate. The ducks were fed corn-soybean meal diets (0% corn DDGS and brewer's grains), 14%, 16%, 18%, and 20% corn DDGS and brewer's grains diets, respectively. After 16 weeks of feeding, 3 duck eggs were collected from each replicate, and the malondialdehyde (MDA) content in the fresh egg yolks was determined.

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

[0029] Reference Table 1: Malondialdehyde (MDA) levels in fresh duck egg yolks;

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

[0031]

[0032]

[0033] As shown in Table 1, compared with the control group, the addition of corn DDGS and brewer's grains to the diet can reduce the content of MDA in fresh duck egg yolks (P<0.05). The reduction is linear and quadratic with the increase of corn DDGS (L<0.01, Q<0.05), and linear with the increase of brewer's grains (L<0.05). Moreover, the reduction 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 yolk, five groups of corn DDGS were selected for pickling test of salted duck eggs, using 5x2 double factor test, using 20% salt water or adding curcumin (0.02wt%) in 20% salt water as pickling liquid, 40 duck eggs per repeat, 6 repeats per group, fresh duck eggs were washed, checked for cracks, put into barrels for pickling, 16.8L water was added to each group to make 20% salt water pickling liquid, 0-0.02wt% curcumin additive was added, all duck eggs were soaked, sealed with plastic wrap, cooked after 30 days of pickling, and the hard core rate, hard core mass ratio and texture properties of salted egg yolk were determined.

[0036] The hard core condition and texture properties of salted duck eggs are shown in Table 2 and Table 3;

[0037] Table 2 Effect of different corn DDGS content in feed and curcumin content in pickling liquid on hard core mass ratio and hard core rate of salted duck eggs

[0038]

[0039]

[0040] As shown in Table 2, different corn DDGS content in feed does not affect the hard core mass ratio of salted duck eggs, but reduces the hard core rate, and the hard core rate of the group using 20% corn DDGS is significantly lower than that of the group without using (P<0.05). The addition of curcumin in the pickling liquid significantly reduces the hard core mass ratio and hard core rate of salted duck eggs (P<0.05).

[0041] Table 3 Effect of different corn DDGS content in feed and curcumin content in pickling liquid on texture properties of salted duck egg yolk

[0042]

[0043] As shown in Table 3, different levels of corn DDGS in feed significantly reduce the hardness, elasticity, gumminess and chewiness of salted egg yolk, and the hardness of 20% corn DDGS is the smallest, the elasticity is the largest, and the gumminess and chewiness are the lowest (P<0.05), and the addition of curcumin in the pickling liquid does not affect the texture properties of salted egg yolk (P>0.05).

[0044] Results analysis:

[0045] 1. As shown in Example 1, the use of corn DDGS and beer lees in breeding egg ducks can reduce the content of MDA in fresh duck eggs, and corn DDGS can cause linear and quadratic reduction, while beer lees can only cause linear reduction, indicating that the performance of corn DDGS is significantly better than that of beer lees;

[0046] 2. As seen from Example 2, the hard center rate of the duck eggs produced by using corn DDGS was significantly reduced after development; the addition of curcumin in the pickling solution significantly reduced the hard center mass ratio and hard center rate of the salted duck eggs. However, the influence of curcumin on the texture characteristics was not obvious.

[0047] In summary, the use of corn DDGS can significantly improve the quality of fresh duck eggs and salted duck eggs.

[0048] The applicant states that the process of the present application is illustrated by the above examples, but the present application is not limited to the above process steps, nor does it mean that the present application must rely on the above process steps to be implemented. It should be understood by those skilled in the art that any improvement on the present application, equivalent replacement of the raw materials selected by the present application, addition of auxiliary ingredients, selection of specific methods, etc. fall within the scope of protection and disclosure of the present application.

Claims

1. Use of corn dried distillers' grains and its soluble matter as a feed additive for laying ducks for reducing the malondialdehyde content of the yolk of duck eggs, characterized in that, The corn dry distiller's grains and soluble are added to the egg duck feed in an amount of 16wt%-20wt%, and the egg duck feed is corn-soybean meal feed.

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