动物营养学报2017，Vol.29Issue(7)：2315-2324,10.DOI:10.3969/j.issn.1006-267x.2017.07.014
动态氨基酸供给对肉鸡生长性能、屠宰性能、营养物质采食量及肠道发育的影响
Effects of Dynamic Supply of Amino Acids on Growth Performance, Carcass Performance, Nutrient Intake and Intestine Development of Broilers
摘要
Abstract
This experiment was conducted to investigate the effects of dynamic supply of amino acids on growth performance, carcass performance, nutrients intake and intestine development of broilers according to the amino acid requirement model.A total of 192 one-day-old Arbor Acres broilers were randomly assigned into 4 groups as group A (2 phases), group B (3 phases), group C (6 phases) and group D (12 phases), respectively.Each group was represented by 6 replicates with 8 broilers per replicate.The experiment lasted for 42 days.The results showed that: 1) average daily gain of broilers in group A was significantly higher than those in groups B, C and D (P<0.05).Average daily feed intake of broilers among groups A, B and C showed no significant differences (P>0.05), while was all significantly higher than those in group D (P<0.05).The ratio of feed to gain of broilers in group A was significantly lower than those in groups B, C and D (P<0.05).2) Slaughter rate of broilers in group B was significantly higher than those in groups A, C and D (P<0.05).Eviscerated percentage of broilers in group B was significantly higher than those in groups C and D (P<0.05), meanwhile showed no significant differences compared with group A (P>0.05).Percentage of breast muscle of broilers in group A was significantly higher than those in groups B, C and D (P<0.05), however percentage of abdominal fat of broilers in group A was significantly lower than those in groups B, C and D (P<0.05).3) The metabolizable energy intake of broilers in group D was significantly lower than those in groups A, B and C (P<0.05).The protein and lysine intakes of broilers in group A were significantly higher than those in groups B, C and D (P<0.05), which in groups B and C were significantly higher than those in group D (P<0.05), too.The methionine intake of broilers in group A was significantly higher than those in groups B and D (P<0.05).Sulfur-containing amino acid intake of broilers in group A was significantly higher than those in groups B and D (P<0.05).The threonine intake of broilers in group D was significantly lower than those in groups A and C (P<0.05).4) Villus height and the ratio of villous height to crypt depth (V/C) in duodenum of broilers in group A were significantly higher than those in groups B, C and D (P<0.05).However there were no significant differences among 4 groups in villus height, crypt depth and V/C in both jejunum and ileum (P>0.05).5) At 42 days of age, body weight of broilers in group A was significantly higher than that in groups B, C and D (P<0.05), while which in groups B and C was significantly higher than that in group D (P<0.05).The cost of unit live weight gain of broilers in groups B, C and D showed no significant differences compared with group A (P>0.05).In conclusion, the findings in this study reveal that 2 phases feeding can promote the development of duodenum and improve the feed intake of broilers.Comprehensive consideration of growth performance, carcass performance and unit weight gain cost, it is recommended to adopt 2 phases feeding in broilers.关键词
肉鸡/动态氨基酸/生长性能/屠宰性能/肠道发育Key words
broilers/dynamic amino acids/growth performance/carcass performance/intestine development分类
农业科技引用本文复制引用
黄向阳,刘国华,常文环,张姝,蔡辉益..动态氨基酸供给对肉鸡生长性能、屠宰性能、营养物质采食量及肠道发育的影响[J].动物营养学报,2017,29(7):2315-2324,10.基金项目
国家肉鸡产业技术体系(CARS-42) （CARS-42）
