Biogas slurry is a nutrient-rich byproduct that contains essential trace elements such as copper, iron, magnesium, manganese, and zinc. It also includes amino acids like lysine and tryptophan, along with vitamins such as cobalt acid, niacin, and riboflavin. The organic materials used in rural biogas digesters—such as animal manure, hemicellulose, crude protein, and crude fat—are broken down by various bacteria into simpler compounds like glucose, fructose, amino acids, and fatty acids during the fermentation process. As a result, the resulting biogas slurry is rich in nutrients, including ethanol, organic nitrogen compounds, phosphorus, and potassium. Moreover, the slurry hosts a diverse and abundant microbial community, which contributes to the production of bacterial proteins through metabolic activity, making the nutritional content of the slurry highly valuable.
**Feeding Method**
1. When chickens reach a live weight of 0.3 kg or more, they can be fed with biogas slurry mixed with regular feed. The mixing ratio should be carefully adjusted to avoid excessive moisture.
2. Fresh biogas slurry should be taken from the middle layer of the digester outlet, after removing the floating foam on top. The liquid should then be filtered through gauze before being mixed thoroughly with chicken feed.
3. Only slurry from digesters that have been functioning properly for over three months should be used. Avoid using slurry from non-functional or sick digesters.
4. The amount of biogas slurry added to the feed should be moderate. If the ratio exceeds 1:1, it may cause diarrhea in the chickens.
**Feeding Effect**
1. The presence of amino acids and trace elements in biogas slurry helps stimulate the ovary function in hens, enhancing their egg-laying capacity.
2. Hens raised with biogas slurry begin laying eggs earlier—about 20 days ahead of schedule. Their laying period is extended by approximately 50 days compared to control groups, with an average egg-laying duration of 250 days. In contrast, hens fed only with conventional feed lay eggs for about 200 days, showing a 25% increase in productivity when fed with biogas slurry.
3. Eggs from chickens fed with biogas slurry weigh an average of 46.7 grams each, while those from hens fed only with standard feed weigh 39.6 grams. This represents a 17.9% increase in egg weight.
4. Chickens raised with biogas slurry reach an average weight of 1.8 kg within 10 months, compared to 1.4 kg for those not fed with biogas slurry. This indicates a 28.75% improvement in growth rate.
5. Using biogas slurry in feeding can increase annual income by more than 15 yuan per hen, offering both economic and nutritional benefits.
In summary, integrating biogas slurry into poultry feed not only improves the health and growth of the birds but also boosts egg production and economic returns, making it a sustainable and effective feeding strategy for small-scale farmers.
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