Biogas slurry is a rich and comprehensive feed additive containing 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 raw materials used in rural household biogas digesters mainly consist of organic substances like feces, hemicellulose, crude protein, and crude fat from livestock and poultry. These materials are broken down by various bacteria into simpler compounds such as glucose, fructose, amino acids, and fatty acids during the fermentation process. As a result, the biogas slurry becomes rich in nutrients, including ethanol, organic nitrogen compounds, phosphorus, potassium, and other beneficial derivatives.
Moreover, the biogas slurry contains a diverse and abundant microbial community that has strong reproductive capabilities. These microbes produce large amounts of bacterial proteins during their metabolic processes, significantly enhancing the nutritional value of the slurry. This makes it an excellent supplement for animal feed, particularly for poultry.
**Feeding Methods**
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 mixture should be well-blended, and the amount of slurry added should not be excessive to avoid digestive issues.
2. Fresh biogas slurry should be collected from the middle layer of the digester outlet, after removing the floating foam on top. After filtering through gauze, it should be thoroughly mixed into the chicken feed before feeding.
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 quantity of biogas slurry should be moderate. If the ratio of slurry to feed exceeds 1:1, it may cause diarrhea in the chickens.
**Feeding Effects**
1. The presence of various active components such as amino acids and trace elements in biogas slurry can effectively stimulate the ovary function of hens, improving their egg-laying capacity.
2. Hens raised with biogas slurry tend to start laying eggs earlier—about 20 days ahead of schedule. Their laying period is extended by approximately 50 days compared to control groups, resulting in an average laying period of 250 days. In contrast, hens fed only with conventional feed have an average laying period of 200 days. This represents a 25% increase in egg production for the former group.
3. Eggs produced by hens fed with biogas slurry have an average weight of 46.7 grams per egg, while those from hens fed only with regular feed weigh 39.6 grams. This means the eggs from the biogas-fed group are 17.9% heavier.
4. Within 10 months, hens fed with biogas slurry reach an average weight of 1.8 kg, whereas those without it only reach 1.4 kg. This results in a 28.75% increase in body weight for the former group.
5. Feeding hens with biogas slurry can increase annual income by more than 15 yuan per hen, making it a cost-effective and beneficial practice for small-scale farmers.
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