日粮添加高比例过瘤胃脂肪对生长肉用绵羊采食行为的影响

Effect of High Proportion Rumen Bypass Fat Diet on Feeding Behavior of Growing Mutton Sheep

旨在研究高比例过瘤胃脂肪日粮对生长期呼伦贝尔羊采食量和采食行为的影响。试验选取12只平均体重为(20±1.9)kg的呼伦贝尔羊随机分配到对照组(CON)和高脂组(23.65%过瘤胃高脂日粮,HF),每组6只,并用摄像头连续记录各试验呼伦贝尔羊的行为活动。连续观察并记录试验羊正试期第83和84天的行为,包括:采食、反刍、饮水、站立、卧倒行为,计算每个行为活动在24 h内的总分钟数,并通过干物质、脂肪、粗蛋白采食量来计算每千克日粮采食时间、采食次数、干物质采食速度、脂肪采食速度、粗蛋白采食速度等指标。结果表明,日粮添加高比例过瘤胃脂肪显著降低生长呼伦贝尔羊精料采食量、干物质采食量和粗蛋白的采食量及采食速度(P<0.05),降低呼伦贝尔羊的采食次数、每日反刍时间、每千克日粮的反刍时间和饮水时间(P<0.05),增加粗脂肪采食量和采食速度(P<0.01)。综上表明,日粮添加高比例过瘤胃脂肪可能通过影响生长肉羊采食次数来降低精料采食量,并减少其饮水行为。

The main purpose of this experiment was to explore the effect of high proportion rumen bypass fat diet on feed intake and feeding behavior of Hulun Buir sheep during growth.Twelve Hulun Buir sheep with an average weight of(20±1.9)kg were randomly assigned to the control group(CON,n=6)and the high fat group(23.65%high rumen bypass fat diet,HF,n=6).And continuously record the behavioral activities of each Hulun Buir sheep during the experiments using a camera.The behaviors of the experimental sheep on the 83 d and 84d were continuously observed and recorded,including feeding,ruminating,drinking,standing,and lying.The time spent on each activity over a 24 h period had been recorded.Based on the feed intake,the rate of dry matter,fat,and crude protein intake were calculated.The results showed that dietary supplementation with high proportion of rumen bypass fat significantly decreased the concentrate feed intake,dry matter intake,crude protein intake and feeding speed(P<0.05),the feed intake times,daily rumination time,rumination time per kilogram of diet and drinking time(P<0.05)of growing Hulun Buir sheep(P<0.05),but increased the intake and feed speed of crude fat(P<0.01).The results suggested that dietary supplementation of high proportion of rumen bypass fat may reduce concentrate intake by affecting the feeding frequency of growing sheep,accompanied by a decrease in drinking behavior.