动物营养学报2023，Vol.35Issue(12)：7714-7723,10.DOI:10.12418/CJAN2023.701
低蛋白质饲粮对罗曼粉蛋鸡产蛋后期生产性能、蛋品质、氨基酸代谢率及排泄参数的影响
Effects of Low Protein Diet on Performance,Egg Quality,Amino Acid Metabolic Rates and Excretion Parameters of Lohmann Pink Laying Hens during Late Laying Period
摘要
Abstract
This experiment was conducted to study the effects of low protein diet on performance,egg quality,amino acid metabolic rates and excretion parameters of Lohmann Pink laying hens during late laying period.A total of 3 024 healthy 61-week-old Lohmann Pink laying hens with similar laying rate were randomly divided into 4 groups with 6 replicates per group and 126 hens per replicate.The control group was formulated with 17.3％crude protein(CP)level in a corn-soybean type diet,and the other three low protein groups were for-mulated with 16.4％(LCP1 group),15.3％(LCP2 group)and 13.2％(LCP3 group)CP levels,respective-ly.All groups had the same levels of lysine(Lys),sulfur-containing amino acid(TSAA)and threonine(Thr)in diets.The experiment lasted for 8 weeks with 1-week adaptation.After the experiment,two hens in each replicate were randomly selected and placed in a metabolic cage,and the metabolic experiment was car-ried out by total fecal collection method,including a 3-day pre-test period and a 4-day fecal collection period.The results showed as follows:1)compared with the control group,the laying rate and feed to egg ratio in low protein groups were no significant differences(P＜0.05),and the average egg weight was significantly de-creased(P＜0.05);the daily egg mass and average daily feed intake(ADFI)in LCP3 group were significant-ly decreased(P＜0.05).2)Compared with the control group,the albumen height,Haugh unit and eggshell strength in low protein groups were no significant differences(P＜0.05);the eggshell thickness at week 4 in LCP3 group was significantly increased(P＜0.05),but there were no significant differences in eggshell thick-ness at week 8 among all groups(P＞0.05).3)Compared with the control group,the plasma total protein content in LCP3 group was significantly increased(P＜0.05);the plasma contents of albumin(ALB)and globulin(GLB)in low protein groups were no significant differences(P＞0.05),and the plasma uric acid(UA)content was significantly decreased(P＜0.05).4)Compared with the control group,the metabolic rates of Lys,methionine(Met)and Thr in LCP1 and LCP2 groups were significantly increased(P＜0.05),and the metabolic rates of CP,Lys,Met and Thr in LCP3 group had no significant differences(P＞0.05).5)Compared with the control group,the average daily nitrogen excretion in low protein groups was significantly decreased(P＜0.05),and the fecal contents of CP,UA and urea nitrogen(UN)in LCP3 group were signifi-cantly decreased(P＜0.05).In conclusion,under the premise of balancing dietary levels of Lys,TSAA and Thr levels,dietary CP level decreasing to 15.3％for Lohmann Pink laying hens during the late laying period(62 to 70 weeks of age)has no significant effects on performance and egg quality,but can improve the meta-bolic rates of CP and AA,and reduce fecal nitrogen excretion.[Chinese Journal of Animal Nutrition,2023,35(12):7714-7723]关键词
低蛋白质饲粮/蛋鸡/生产性能/蛋品质/氨基酸代谢率/排泄参数Key words
low protein diet/laying hens/performance/egg quality/amino acid metabolic rates/excretion parameters分类
农业科技引用本文复制引用
王江水,张家才,王永强,齐德生,郭吉余..低蛋白质饲粮对罗曼粉蛋鸡产蛋后期生产性能、蛋品质、氨基酸代谢率及排泄参数的影响[J].动物营养学报,2023,35(12):7714-7723,10.基金项目
广州市高水平企业研究院自主选题项目专题(202205110006) （202205110006）
