北京地区夏季体温变化对奶牛泌乳性能的影响分析

发布时间：2018-03-27 05:25

本文选题：奶牛　切入点：直肠温度　出处：《黑龙江畜牧兽医》2017年03期

【摘要】：为了探究夏季热应激状态下奶牛体温变化对产奶量和乳成分的影响,试验测定北京地区5个牛场1 691头中国荷斯坦泌乳母牛连续2 d上午和下午的直肠温度(RT)、体况评分(BCS)以及当月泌乳性能(DHI数据),在固定模型中考虑了测定年、场(年场效应)、胎次和泌乳阶段三个分类效应,且将下午直肠温度(RT_2)、上午下午直肠温度差(△RT)和BCS作为回归协变量。结果表明:校正奶量和日奶量对RT_2回归均极显著(P0.01);△RT_2对日奶量有显著(P0.05)的影响,对校正奶量有极显著(P0.01)的影响;RT_2、△RT对乳脂率、乳蛋白率和脂蛋比均有显著(P0.05)或极显著(P0.01)影响,乳脂率和脂蛋比随着RT_2的升高而增大,随着△RT的增大而减小;而乳蛋白率随着RT_2的升高而减小,随着△RT的增大而增大。说明直肠温度作为奶牛热应激反应较好的量化指标,同时与奶牛泌乳性能有密切关系,可以将其作为管理指标,密切监测提高管理效率。
[Abstract]:In order to investigate the effect of body temperature change on milk yield and milk composition under summer heat stress, The rectal temperature of 1 691 Chinese Holstein lactating cows in 5 cattle farms in Beijing area were measured for 2 consecutive days in the morning and afternoon. The body condition score (BCSS) and the DHI data of the month's lactation performance were measured. The determination years were taken into account in the fixed model. Field (annual field effect), birth order and lactation stage, The rectum temperature in the afternoon and rectum temperature difference (RTT) and BCS in the afternoon were taken as covariables. The results showed that the corrected milk quantity and daily milk quantity had significant effects on the RT_2 regression, and RT_2 had a significant effect on the daily milk output. The effects of RT on milk fat rate, milk protein rate and fat / egg ratio were significant (P 0.05) or extremely significant (P 0.01). The milk fat ratio and fat / egg ratio increased with the increase of RT_2, but decreased with the increase of RT. The rate of milk protein decreased with the increase of RT_2 and increased with the increase of RT, which indicated that rectal temperature was a good quantitative index of thermal stress reaction in dairy cows, and had a close relationship with milk performance of dairy cows, which could be taken as management index. Monitor closely to improve management efficiency.
【作者单位】：中国农业大学;首农畜牧发展有限公司;
【基金】：现代农业(奶牛)产业技术体系建设专项资金项目(CAR-37) “十二五”国家科技支撑计划项目(2011BAD28B02) 2014年北京市科技计划项目“奶牛抗热应激综合措施研究与科技示范”(Z151100001015012) 中央高校基本科研业务费专项资金项目长江学者和创新团队发展计划项目(IRT1191)
【分类号】：S823.91

【相似文献】