Effects of Dietary Sterol-Enriched Yeast Hydrolysate on Ovar-ian Development, Reproductive Endocrine Status, Im-mune-Inflammatory Responses, Antioxidant Indices, and Egg Quality in Late-Laying Yellow-Feathered Broiler Breeder Hens

The present study investigated the effects of graded dietary supplementation with sterol-enriched yeast hydrolysate (SYH) on reproductive performance, egg quality, ovarian development, reproductive endocrine status, immune-inflammatory responses, antioxidant status, and ovarian gene expression in late-laying yellow-feathered broiler breeder hens. A total of 720 55-week-old hens were assigned to four dietary treatments containing 0, 0.2, 0.5, or 0.8 g/kg SYH and were evaluated over a six-week feeding period.本研究考察了分级日粮添加甾醇富集酵母水解物（sterol-enriched yeast hydrolysate, SYH）对产蛋后期黄羽肉鸡种母鸡的繁殖性能、蛋品质、卵巢发育、生殖内分泌状态、免疫炎症反应、抗氧化机能以及卵巢基因表达的影响。试验共选取720只55周龄的种母鸡，将其分为4个日粮处理组，各组分别添加0、0.2、0.5、0.8 g/kg的SYH，试验周期为6周。