中国畜牧兽医 ›› 2022, Vol. 49 ›› Issue (9): 3362-3371.doi: 10.16431/j.cnki.1671-7236.2022.09.010

• 生理生化 • 上一篇    下一篇

北京地区泌乳牛夏季鼓膜温度昼夜节律及影响因素研究

许静漪1, 罗汉鹏1, 付琪1, 胡羽飏1, 段禹交1, 黄思琪1, 周月玲1, 杨桐桐1, 张亚一2, 郭刚2, 刘巧香3, 王雅春1   

  1. 1. 中国农业大学动物科技学院, 农业农村部动物遗传育种与繁殖(家畜)重点实验室, 畜禽育种国家工程实验室, 北京 100193;
    2. 北京首农畜牧发展有限公司, 北京 100029;
    3. 北京生物种业创新联合体, 北京 101206
  • 收稿日期:2022-03-27 出版日期:2022-09-05 发布日期:2022-08-24
  • 通讯作者: 王雅春 E-mail:wangyachun@cau.edu.cn
  • 作者简介:许静漪,E-mail:ed-adam@foxmail.com。
  • 基金资助:
    财政部和农业农村部:国家现代农业产业技术体系(CARS-36);长江学者和创新团队发展计划(IRT_15R62)

Circadian Rhythm and Influencing Factors of Tympanic Temperature in Lactating Cows in Summer in Beijing

XU Jingyi1, LUO Hanpeng1, FU Qi1, HU Yuyang1, DUAN Yujiao1, HUANG Siqi1, ZHOU Yueling1, YANG Tongtong1, ZHANG Yayi2, GUO Gang2, LIU Qiaoxiang3, WANG Yachun1   

  1. 1. National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of Ministry of Agriculture and Rural Affairs, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
    2. Beijing Sunlon Livestock Development Company Limited, Beijing 100029, China;
    3. Beijing Innovation Consortium of Bio-breeding, Beijing 101206, China
  • Received:2022-03-27 Online:2022-09-05 Published:2022-08-24

摘要: 【目的】 试验旨在揭示北京地区荷斯坦泌乳牛鼓膜温度的群体特征及其随昼夜和环境温湿度指数(temperature-humidity index,THI)的变化规律,探究中度热应激下泌乳牛鼓膜温度的影响因素及其与直肠温度的关系。【方法】 2021年8月对北京地区某规模化牧场638头荷斯坦泌乳牛的鼓膜温度、直肠温度及环境温湿度进行测定,并对其进行描述性统计;对161头荷斯坦泌乳牛6 h鼓膜温度和直肠温度进行相关性分析;利用混合线性模型分析THI、测定时间、胎次、泌乳阶段和繁殖状态等因素对鼓膜温度和直肠温度的影响。【结果】 北京地区荷斯坦泌乳牛夏季鼓膜平均温度为(39.01±0.40)℃;测定时间内THI为76.11~83.18,此时泌乳牛处于中度热应激。泌乳牛鼓膜温度昼夜变化较大,昼夜节律表现为上午低、下午和傍晚均较高且在早晨和下午出现不正常峰值,鼓膜温度的变化滞后于THI变化。鼓膜温度与直肠温度呈显著正相关关系(P<0.05,r=0.35),且两种体温均随着THI的升高而升高,回归系数分别为0.09(P<0.05,R2=0.09)和0.10(P<0.05,R2=0.08)。测定时间和胎次对泌乳牛鼓膜温度有显著影响(P<0.05),胎次和泌乳阶段对泌乳牛直肠温度有显著影响(P<0.05),且THI对两部位温度的回归均显著(P<0.05)。【结论】 本研究揭示了奶牛体温的节律变化和影响因素,鼓膜温度可有效反映奶牛实时体温,可为精细化管理牛群提供理论依据。

关键词: 泌乳牛; 鼓膜温度; 直肠温度; 昼夜节律

Abstract: 【Objective】 The objectives of current study were to reveal the population characteristics of tympanic temperature in lactating cows and its change with temperature-humidity index (THI).Further, the influence factors of tympanic temperature and its correlation with rectal temperature under moderate heat stress were investigated.【Method】 The records of tympanic temperature, rectal temperature, as well as environmental temperature and humidity were measured from 638 Holstein dairy cows from Beijing in August, 2021.Descriptive statistics of tympanic temperature, rectal temperature and THI were summarized.Then the correlations between 6 h tympanic temperature and rectal temperature in 161 Holstein dairy cows were analyzed.Finally, a linear mixed model was employed to test the significances of effects, such as collecting time, parity, lactation stage, and reproductive status on tympanic temperature and rectal temperature.【Result】 In Beijing, the average tympanic temperature of Holstein cows in summer was 39.01 ℃±0.40 ℃ under moderate heat stress (THI was 76.11 to 83.18) during the measurement time.Under this circumstance, tympanic temperature was differed between day and night, and when THI changed, it showed a slight delay.To be specific, tympanic temperature was lowest in the forenoon and stay heated in the afternoon and nightfall, with 2 abnormal peak values in the morning and afternoon.The tympanic temperature and rectal temperature were significantly correlated (P<0.05, r=0.35).In addition, tympanic temperature and rectal temperature rose gradually with THI increasing, and the regression coefficients of tympanic temperature and rectal temperature on THI were 0.09 (P<0.05, R2=0.09) and 0.10 (P<0.05, R2=0.08), respectively.Collecting time and parity had significant effects on tympanic temperature, while parity and lactation stage significantly affected rectal temperature (P<0.05).THI had significant regression on both tympanic temperature and rectal temperature of lactating cows (P<0.05).【Conclusion】 The results of current study revealed the rhythmic changes and influencing factors of cow body temperature.The tympanic temperature could effectively reflect the real-time body temperature of lactating cows, which provided a theoretical basis for the fine management of farm.

Key words: lactating cow; tympanic temperature; rectal temperature; circadian rhythms

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