宁都黄鸡育成期限制饲养对前期产蛋的影响OA

To optimize breeding techniques for parent chickens,this study aimed to investigate the regulatory effects of restricted feeding during the growing period on the body condition and egg production performance of Ningdu yellow chicken replacement pullets.A total of 880 healthy 70-day-old replacement pullets from the Ningdu yellow chicken breeding farm were randomly divided into four groups,with four replicates per group and 55 birds per replicate.Different diet types and daily feeding amounts were applied,and observations continued until 30 weeks of age.The growth performance during the growing period and early egg production performance were measured to examine their specific effects on body condition indicators at the end of the growing period and early egg production performance.The results showed that the fourth group exhibited significantly superior body condition indicators,including body weight at first egg(1416.88±166.07 g),chest circumference at the end of the growing period(28.68±1.49 cm),and keel length(8.53±0.49 cm),compared to the other groups(P<0.05).During the early egg production stage,the cumulative egg production rate at 30 weeks of age in the fourth group reached 66.57±6.92％,significantly higher than that of the control group(47.27±7.19％)and the second group(48.46±7.94％)(P<0.05).The feed-to-egg ratio was as low as 3.69±0.43％,significantly lower than that of the other groups(P<0.01).Additionally,egg quality indicators such as Haugh unit(88.76±7.17)and eggshell weight(4.22±0.48 g)were optimal in the fourth group.The results indicate that implementing a restricted feeding regimen for Ningdu yellow breeder hens—feeding them grower feed before 20 weeks of age and switching to layer feed starting at 21 weeks—effectively optimizes their body condition development and significantly enhances early egg production performance as well as feed utilization efficiency.This study provides theoretical and technical support for enhancing the breeding efficiency of Ningdu yellow chicken replacement pullets.