Studies on slowly released natural agent with immune enhancement for chicks: effects of incrtsing ill-resistance of chicks and anti-bactrinl drugs to white flux and colibacillosis

• 鸡用天然缓释免疫增强剂的研究--对提高雏鸡抵抗力及与抗菌药物治疗鸡白痢和大肠杆菌病的效果