动物营养学报2017，Vol.29Issue(10)：3541-3550,10.DOI:10.3969/j.issn.1006⁃267x.2017.10.015
饲喂高淀粉饲粮时不同瘤胃降解淀粉水平对奶牛泌乳性能、营养物质表观消化率和氮平衡的影响
Effects of Different Ruminally Degradable Starch Levels on Lactation Performance, Nutrient Apparent Digestibility and Nitrogen Balance of Dairy Cows Fed High Starch Diets
摘要
Abstract
This trial was performed to examine the effects of different ruminally degradable starch levels on lac?tation performance, nutrient apparent digestibility and nitrogen balance of dairy cows fed high starch diets. Ten multiparous Holstein cows [(average lactation days: (214±38) d; average milk yield: (26.2±2.4) kg/d;average body weight: (727±65) kg] were randomly assigned to 2 groups, and each group had 5 dairy cows. Two types of diets with different ruminally degradable starch levels were formulated, one of them contained 62.3% ( percentage of total starch) ruminally degradable starch which named as low?ruminally degradable starch diet ( L?RDS) , and the other contained 72.1% ( percentage of total starch) ruminally degradable starch which named as high?ruminally degradable starch diet ( H?RDS) . A crossover experimental design was applied. There were two experimental periods, the transition period lasted for 7 d, and each period lasted for 21 d (14 d of pretrial period, and 7 d of sampling period). The results showed as follows:1) the apparent digesti?bility of starch and organic matter was significantly increased (P<0.05), the apparent digestibility of neutral detergent fiber and acid detergent fiber was significantly decreased ( P<0.05) , and the apparent digestibility of dry matter had a rising trend (P=0.07) for H?RDS group compared with L?RDS group, but no significant difference in the apparent digestibility of crude protein among them (P>0.05). 2) Compared with L?RDS group, urinary urea?nitrogen and the proportion of urinary urea?nitrogen in nitrogen intake had a decrease trend for H?RDS group (P=0.09). The nitrogen intake, milk nitrogen, urinary nitrogen, fecal nitrogen, nitrogen retention and the proportions of them in nitrogen intake were not significantly affected by dietary ruminally de?gradable starch level (P>0.05), and the urinary excretion of purine derivatives and microbial protein yield were also not significantly affected by dietary ruminally degradable starch level ( P>0.05) . 3) Dry matter in?take, milk yield and milk composition of dairy cows were not significantly affected by dietary ruminally de?gradable starch level ( P>0.05) . Results of this study show that different ruminally degradable starch levels can affect the nutrient apparent digestibility of dairy cows fed high starch diets, with no significant influences on lactation performance and nitrogen balance.关键词
奶牛/瘤胃降解淀粉/乳产量/氮平衡/表观消化率Key words
dairy cows/ruminally degradable starch/milk yield/nitrogen balance/apparent digestibility分类
农业科技引用本文复制引用
雒国彬,孙凯晶,王馨影,张广宁,刘岩,王利军,徐宏建,张永根..饲喂高淀粉饲粮时不同瘤胃降解淀粉水平对奶牛泌乳性能、营养物质表观消化率和氮平衡的影响[J].动物营养学报,2017,29(10):3541-3550,10.基金项目
国家奶牛产业技术体系项目( CARS?37) （ CARS?37）
