Compound feed for cage-rearing laying hens to produce selenium-rich eggs as well as preparation method and application of compound feed

Abstract

The invention discloses a compound feed for cage-rearing laying hens to produce selenium-rich eggs as well as a preparation method and application of the compound feed. The compound feed comprises the following components in percentage by weight: 50%-65% of corn, 10%-20% of soybean meal, 5%-15% of rumex hanus powder, 3%-10% of fish meal, 1%-5% of a selenoprotein nutrient solution, 2%-8% of glucose, 1%-3% of zeolite powder, 5%-9% of stone powder, 1%-1.5% of calcium hydrophosphate, 0.2%-0.4% of table salt and 0.5%-1% of a laying hen premix. The preparation method comprises the steps of raw material crushing, mixing, selenoprotein nutrient solution spraying, final mixing and the like. The method is characterized in that through the synergistic effect of the rumex hanus powder, the selenoprotein nutrient solution, the glucose and the zeolite powder, the deposition efficiency and stability of selenium in the eggs are remarkably improved. The feed is fed to laying hens (for example, the laying hens are 300 days old) in the egg producing period, selenium-rich eggs with the selenium content reaching 0.42 mg / Kg can be stably produced, the national standard is met, and the feed is high in safety and easy to popularize.

Description

Technical Field

[0001] This invention relates to the field of poultry farming and feed technology, specifically to a compound feed formula that can significantly increase the selenium content in eggs, its preparation method, and its application in the large-scale production of selenium-enriched eggs. Background Technology

[0002] Selenium is an essential trace element for the human body, participating in the formation of various antioxidant enzymes and playing an important role in maintaining immune system function, preventing Keshan disease, Kashin-Beck disease, and fighting cancer. Selenium deficiency in the human body can lead to a series of health problems. Because the soil in most parts of my country is selenium-deficient, the intake of selenium in daily food is generally insufficient. Therefore, developing selenium-enriched foods has become an important way to solve the problem of selenium deficiency in the human body.

[0003] Eggs, as a high-quality protein source for daily consumption, are ideal for selenium fortification when produced using biotransformation technology. Currently, the main technology for producing selenium-enriched eggs involves adding selenium sources to the diets of laying hens, including inorganic selenium (such as sodium selenite) and organic selenium (such as selenium yeast and selenomethionine). However, inorganic selenium suffers from drawbacks such as low absorption and utilization rates, high toxicity, unstable deposition in eggs, and a tendency to exceed residue limits. While existing organic selenium additives offer higher safety, they are expensive, and the deposition efficiency and stability of selenium in eggs under different feeding models still need improvement.

[0004] Chinese invention patent application CN201810XXXXXX.X discloses a method for producing selenium-enriched eggs, but it mainly relies on selenium yeast as the selenium source, resulting in high costs. Patent application CN202010XXXXXX.X discloses the synergistic effect of traditional Chinese medicines such as astragalus and angelica with sodium selenite, but it still involves the use of inorganic selenium, posing safety risks.

[0005] Therefore, developing a feed formula that utilizes a novel, efficient, and safe organic selenium source and employs scientific nutrient ratios to enable caged laying hens to stably and efficiently produce selenium-enriched eggs that meet national standards has significant practical importance and market value. Summary of the Invention

[0006] The purpose of this invention is to provide a compound feed with high selenium deposition efficiency, good safety, and stable production of selenium-enriched eggs, so as to overcome the shortcomings of the prior art.

[0007] Another object of the present invention is to provide a method for preparing the above-mentioned compound feed.

[0008] Another object of the present invention is to provide the application of the above-mentioned compound feed in the preparation of selenium-enriched eggs.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] In a first aspect, the present invention provides a compound feed for caged laying hens to produce selenium-enriched eggs, comprising, by weight percentage:

[0011] Corn 50%–65%,

[0012] · Soybean meal 10%–20%,

[0013] ·Leaf grass powder 5% to 15%,

[0014] Fish meal 3%–10%,

[0015] • Selenium protein nutrient solution 1%–5%,

[0016] • Glucose 2%–8%,

[0017] ·Zeolite powder 1%–3%,

[0018] • Stone powder 5%–9%,

[0019] • 1%–1.5% dicalcium phosphate

[0020] • Salt content: 0.2%–0.4%

[0021] • 0.5%–1% of laying hen premix.

[0022] Preferably, the total selenium content in the compound feed is 1.0 to 1.5 mg / kg, and this content is tested according to the standard method of GB5009.93-2017.

[0023] Secondly, the present invention provides a method for preparing the above-mentioned compound feed, comprising the following steps:

[0024] (1) Raw material pretreatment: Crush corn and soybean meal separately and pass them through a 60-80 mesh sieve;

[0025] (2) Initial mixing: According to the above proportions, put the crushed corn, soybean meal, leafy grass powder, fish meal, zeolite powder and glucose into a twin-shaft paddle mixer and mix for 5 to 10 minutes.

[0026] (3) Liquid addition: Under continuous stirring, the selenium protein nutrient solution is evenly sprayed into the mixed dry material in step (2) through an atomizing nozzle;

[0027] (4) Final mixing: Add stone powder, dicalcium phosphate, salt, and laying hen premix to the mixer and mix with the material obtained in step (3) for 10 to 15 minutes until completely uniform;

[0028] (5) Packaging and storage: Pack the well-mixed finished feed and store it in a cool and dry place.

[0029] Thirdly, this invention provides the application of the above-mentioned compound feed in enabling caged laying hens to produce selenium-enriched eggs. Feeding healthy caged laying hens at their peak egg production period (e.g., around 300 days old) with the feed of this invention for more than 10 consecutive days can stably produce eggs with selenium content meeting the standards for selenium-enriched foods.

[0030] The beneficial effects of this invention are as follows:

[0031] 1. Significant Synergistic Effect of the Formula: This invention creatively combines edible herb powder, selenium protein nutrient solution, glucose, and zeolite powder. Edible herb powder is rich in protein, vitamins, and minerals, providing an excellent nutritional foundation for selenium metabolism; the selenium protein nutrient solution, as the core organic selenium source, has high biocompatibility; glucose provides rapid energy, potentially optimizing the metabolic energy level of laying hens and promoting selenium absorption and transport to follicles; zeolite powder, as an intestinal conditioner, can adsorb toxins, maintain intestinal health, and may improve the bioavailability of selenium through ion exchange. These four key components produce an unexpected synergistic effect, enabling selenium to be deposited into eggs efficiently and stably.

[0032] 2. Product safety and compliance with standards: This invention completely eliminates inorganic selenium, using only natural or organic raw materials, fundamentally avoiding toxicity risks and residue issues. Specific implementation cases demonstrate that eggs produced using this feed have a stable selenium content at an average level of 0.42 mg / kg, meeting and exceeding common national standards for selenium-enriched eggs (typically ≥0.15-0.50 mg / kg), with minimal batch-to-batch variation and consistent quality.

[0033] 3. High production efficiency and strong practicality: The raw materials for this feed formula are widely available, the cost is relatively controllable, the preparation process is simple, and it is easy to scale up and promote in the feed industry, providing a reliable technical guarantee for a stable supply of high-quality selenium-enriched eggs to the market. Attached Figure Description

[0034] Figure 1 This is a flowchart of the preparation process of the compound feed of the present invention. Detailed Implementation

[0035] The present invention will be further illustrated by the following embodiments, but the scope of protection of the present invention is not limited to these embodiments.

[0036] Example 1: Formulation of Compound Feed

[0037] To prepare 1000 kg of the feed of this invention, the specific proportions (by weight) are as follows:

[0038] Corn: 600kg

[0039] Soybean meal: 120kg

[0040] ·Leaf-eating grass powder: 80kg

[0041] Fish meal: 60kg

[0042] • Selenium-protein nutrient solution (brand name, organic selenium content ≥5000mg / Kg): 30kg

[0043] • Glucose: 50kg

[0044] Zeolite powder: 15kg

[0045] • Stone powder: 70kg

[0046] • Calcium hydrogen phosphate: 12kg

[0047] Salt: 3kg

[0048] • Laying hen premix (meeting NRC laying hen nutritional requirements): 8kg

[0049] The feed was processed according to the aforementioned preparation method: first, corn and soybean meal were crushed and passed through a 60-mesh sieve, then mixed with leafy grass powder, fish meal, zeolite powder, and glucose in a mixer for 7 minutes; subsequently, selenium protein nutrient solution was sprayed in while stirring; finally, limestone powder, dicalcium phosphate, salt, and premix were added, and the mixture was stirred for another 12 minutes. The finished product was tested according to GB5009.93-2017 standard, and the selenium content in the feed was 1.19 mg / Kg.

[0050] Example 2: Verification Experiment on the Production Effect of Selenium-Enriched Eggs

[0051] Experimental Design:

[0052] • Experimental animals: 500 Hy-Line Brown laying hens aged 300 days, in good health, and with similar egg production rates were randomly divided into one group.

[0053] • Experimental feed: The compound feed prepared in Example 1 was fed to the animals.

[0054] • Feeding and management: Stacked cages are used, with free access to feed and water. Lighting and immunization programs are carried out according to standard protocols.

[0055] • Sampling and Testing: Starting from day 10 of feeding the experimental diet, sampling points were established every 10 days (i.e., days 10, 20, 30, 40, 50, and 60), with 30 eggs randomly collected each day. After removing the shells, the collected eggs were thoroughly homogenized, and the selenium content in the whole egg was determined according to the method specified in GB5009.93-2017 National Food Safety Standard for the Determination of Selenium in Food.

[0056] Experimental results:

[0057] Selenium content (mg / Kg) of eggs from the tested batches after feeding (days) 1 10 0.38 2 20 0.41 3 30 0.43 4 40 0.44 5 50 0.42 6 60 0.42

[0064] The arithmetic mean is 0.42.

[0065] Conclusion: Experimental data show that after feeding laying hens with the feed of this invention for 10 days, the selenium content in the eggs reached 0.38 mg / kg, then rapidly increased and stabilized at 0.42 mg / kg. Throughout the 60-day experimental period, the average selenium content in the eggs was 0.42 mg / kg with minimal fluctuations, proving that the feed of this invention can continuously and stably produce eggs that meet selenium enrichment standards, solving the problems of unstable deposition and large batch-to-batch variations in existing technologies.

Claims

1. A compound feed for producing selenium-enriched eggs in caged laying hens, its preparation method, and its application, characterized in that, It consists of the following components by weight percentage: Corn 50%–65%, Soybean meal 10%–20%, Leaf-eating grass powder 5% to 15%, Fish meal 3%–10%, Selenium protein nutrient solution 1%–5%, Glucose 2%–8%, 1%–3% zeolite powder Stone powder 5%–9%, 1%–1.5% dicalcium phosphate Salt content: 0.2%–0.4%. 0.5%–1% of the premixed feed for laying hens.

2. The compound feed according to claim 1, characterized in that, The total selenium content in the compound feed is 1.0–1.5 mg / kg.

3. A method for preparing the compound feed as described in claim 1 or 2, characterized in that, Includes the following steps: a. Raw material pretreatment: Crush the corn and soybean meal separately; b. Mixing: Add the crushed corn, soybean meal, leafy grass powder, fish meal, zeolite powder, and glucose to a mixer according to the specified ratio and mix. c. Liquid addition: While stirring, spray the selenoprotein nutrient solution into the mixture obtained in step b; d. Final mixing: Add stone powder, dicalcium phosphate, salt and laying hen premix to the mixer and mix with the material obtained in step c until uniform.

4. The method according to claim 3, characterized in that, In step a, the pulverization is performed by passing the material through a 60-80 mesh sieve.

5. The method according to claim 3, characterized in that, The mixing time in step b is 5 to 10 minutes, and the mixing time in step d is 10 to 15 minutes.

6. The application of the compound feed as described in claim 1 or 2 in the preparation of selenium-enriched eggs.

7. The application according to claim 6, characterized in that, The selenium content in the selenium-enriched eggs is not less than 0.30 mg / kg.

8. The application according to claim 6, characterized in that, The application involves feeding the compound feed to caged laying hens during their egg-laying period.

9. The application according to claim 8, characterized in that, The laying hens mentioned are those around 300 days old.

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