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

doi:10.16431/j.cnki.1671-7236.2020.05.015

Abstract

Abstract: 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%.

Key words: dietary CP level; Dawu Golden Phoenix commercial laying hens; peak egg production; production performance; egg quality

CLC Number:

S815.1

WANG Shaojing, DONG Tianlai, MA Qiugang, ZHU Yubo, ZHAO Lihong, ZHANG Jianyun, JI Cheng. 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[J]. China Animal Husbandry and Veterinary Medicine, 2020, 47(5): 1421-1427.

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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

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