复合益生菌对提高蛋鸡产蛋性能和蛋品质的作用研究

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中图分类号：S816.7 文献标识码：A 文章编码：1005-8567（2025）04-0001-07

Abstract：Thisstudy aimed to investigate the effects of dietarysupplementation with different doses of compound probiotics on production performance，egg quality，reproduction-related traitsand organ indices in old aged laying hens.A totalof288 Jingfen layinghensaged 68 weeks withnormal egg production were selectedandrandomlydivided into 4 groups based on similar laying rates.The basal diet was supplemented with O，2OO，3OO，and 400mg/kg of compound probiotics，respectively.Theresultsshowed that：dietary supplementation with compound probiotics exhibited certain trends in affecting the laying rate and daily egg mass（EM）（ P <0.10）．With the dietary supplementation level of probiotics increased，the laying rate demonstrated a significant linear increase（ P =0.047）， while daily EM showed a tendency toward linear increase （ P=0.092 ）.Meanwhile，the unqualified egg rate exhibited a tendency toward linear decrease（ P =0.078）.Eggs from the 300mg/kg group had the highest eggshell strength， significantly exceeding the other 3 groups （ P<0.05 ）.With increasing dietary probiotic levels，Haugh unit displayed a significant quadratic effect characterizedbyan initial increase followed bya slight decrease （ P=0.005 ）. The number of dominant follicles also showed a trend of initial increase followed by decrease（ P =0.078）.Dietary probiotics significantly affected abdominal fat percentage（AF % ）（ P =0.037），with the lowest value observed in the 300mg/kg （204号 group.Based on the significance（ P values）and correlation coefficients（ R2 ）of quadratic polynomial or broken-line modelsestablished for Haughunitand AF % inresponse to probiotic dosage，and considering all experimental indicators comprehensively，theoptimal dietary supplementation levelof compound probiotics for aged laying hens was determined to be 300mg/kg

Keywords：Probiotics;Laying hen;Laying performance;Eggquality;Reproductive traits

蛋鸡超过60周龄通常被认为是位于老龄化阶段，随着蛋鸡产蛋后期鸡群日龄增加，老龄蛋鸡面临产蛋率下降，鸡蛋蛋壳强度下降、破蛋率升高等问题已成为蛋鸡产业提质、降本增效的瓶颈[1-3]。（剩余9702字）