日粮氨基酸平衡条件下大午金凤商品代蛋鸡产蛋高峰期粗蛋白质需要量研究

本试验通过研究日粮粗蛋白质（CP）水平对大午金凤商品代蛋鸡产蛋高峰期生产性能和蛋品质的影响，确定其CP需要量。试验选取31周龄大午金凤商品代蛋鸡480只，随机分入4个处理组，每组12个重复，每个重复10只蛋鸡，4个处理CP水平分别为13.5%、14.5%、15.5%、16.5%。预试期7 d，正试期63 d。试验期间每天记录蛋鸡产蛋数、蛋重和不合格蛋数，每2周以重复为单位统计采食量，计算平均日采食量（ADFI）和料蛋比（F/E）；试验第6周时，每个重复取3枚鸡蛋测定蛋品质。结果表明：①日粮CP水平对蛋鸡日产蛋量、日采食量、料蛋比有显著影响（P<0.05）。16.5% CP组的日产蛋量、平均日采食量均显著高于13.5%和14.5% CP组（P<0.05），且随着日粮CP水平的提高日产蛋量呈线性增加（P<0.05）；16.5% CP组的料蛋比显著低于13.5%、14.5%和15.5% CP组（P<0.05）。②日粮CP水平对蛋壳占比、蛋黄颜色有显著影响（P<0.05），13.5% CP组的蛋壳占比显著高于16.5% CP组（P<0.05），且随着日粮CP水平的提高呈线性降低（P<0.05）；13.5% CP组的蛋黄颜色显著高于16.5% CP组（P<0.05），且随着日粮CP水平的提高蛋黄颜色呈线性降低（P<0.05）。建立料蛋比与日粮CP水平之间的回归曲线（y＝275x²-86.4x+8.7356），经计算，获得最小料蛋比的日粮CP需要量为15.7%。结合本试验生产性能和蛋品质，推荐大午金凤商品代蛋鸡产蛋高峰期CP需要量为15.7%。

Study on Dietary Protein Requirements of Dawu Golden Phoenix Commercial Generation Laying Hens During Peak Egg Production Period Under the Condition of Dietary Amino Acid Balance

In this study,the effects of dietary crude protein (CP) level on the production performance and egg quality of Dawu Golden Phoenix commercial layer were studied to determine the CP requirement.In the experiment,480 31-week-old Dawu Golden Phoenix commercial layers were selected and randomly divided into 4 treatment groups with 12 replicates in each group and 10 layers in each replicate.The CP levels of the 4 treatment groups were 13.5%,14.5%,15.5% and 16.5%,respectively.The pre-test period was 7 d,and the formal period was 63 d.During the experiment,the number of eggs laid by layers,egg weight and unqualified eggs were recorded every day.Feed intake was counted by repetition every 2 weeks,and average daily feed intake (ADFI) and feed-to-egg ratio (F/E) were calculated.At week 6 of the experiment,three eggs were taken for each iteration to determine egg quality.The results showed that:① The CP level in the diet had a significant impact on the daily egg production,average daily feed intake and feed-to-egg ration of laying hens (P<0.05).The average daily feed intake and the daily egg production of laying hens in 16.5% CP group was significantly higher than that in 13.5% and 14.5% CP groups (P<0.05),and the daily egg production increased linearly with the increase of the CP level in the diet (P<0.05).The feed-to-egg ratio in 16.5% CP group was significantly lower than that in 13.5%,14.5% and 15.5% CP groups (P<0.05).②Dietary crude protein level had a significant effect on the proportion of egg shell and yolk color (P<0.05).The proportion of egg shell in the 13.5% CP group was significantly higher than that in the 16.5% CP group (P<0.05),and the proportion of egg shell decreased linearly with the increase of the dietary CP level (P<0.05).The yolk color in 13.5% CP group was significantly higher than that in 16.5% CP group (P<0.05),and the yolk color decreased linearly with the increase of diet CP level (P<0.05).By establishing the regression curve between feed-to-egg ratio and protein level (y＝275x²-86.4x+8.7356),the protein level for the minimum feed-to-egg ratio was 15.7%.Therefore,considering the results of production performance and egg quality,the dietary crude protein level of Dawu Golden Phoenix commercial layer during peak egg production period was recommended to be 15.7%.