Effects of the temperature-humidity index on conception rates in Holstein heifers and cows receiving in vitro-produced Japanese Black cattle embryos.

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-04-03 DOI:10.1262/jrd.2022-112

Takamasa Nishisozu, Jaswant Singh, Akinori Abe, Kazuo Okamura, Osamu Dochi

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引用次数: 3

Abstract

We investigated the effect of the temperature-humidity index (THI) on the conception rate (CR) in Holstein heifers and cows receiving in vitro-produced (IVP) Japanese Black cattle fresh embryos. IVP embryos were transferred to Holstein heifers (n = 1,407) and cows (n = 3,189) on 245 commercial farms. The monthly average ambient temperature (AT) and THI ranged from 4.7 to 29°C and 41 to 81, respectively; both were the highest in August. The monthly CR ranged from 16.3% to 46.7% in cows and 23.8% to 74.1% in heifers. The CR of heifers was unaffected by THI, AT, or the month of embryo transfer. However, these parameters affected the CR of cows. The CR at THI values of 61-65 and 71-75 was greater than that at THI > 75, whereas other THI values had no effect. The CR at temperatures > 25°C was lower (P = 0.008) than that at temperatures of 15-20°C and 20-25°C. Moreover, the CR was lowest (P = 0.003) in July. THI and parity (P = 0.057 and P = 0.001, respectively) and AT and parity (P = 0.019 and P = 0.001, respectively) showed significant effects on CR; however, there was no interaction between these two factors. In conclusion, AT > 25°C and THI > 75 adversely affect the CR outcome in cows but not in heifers.

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温湿指数对荷斯坦母牛和母牛接受日本黑牛体外胚胎受孕率的影响。

研究了温度湿度指数(THI)对荷斯坦母牛和母牛体外生产的日本黑牛新鲜胚胎受孕率(CR)的影响。IVP胚胎被移植到245个商业农场的荷斯坦小母牛(n = 1,407)和奶牛(n = 3,189)。月平均环境温度(AT)和THI分别在4.7 ~ 29℃和41 ~ 81℃之间;两者都是8月份最高的。月产率奶牛为16.3% ~ 46.7%，小母牛为23.8% ~ 74.1%。母牛的CR不受THI、AT或胚胎移植月份的影响。但这些参数对奶牛的CR均有影响。THI值为61 ~ 65和71 ~ 75时的CR大于THI > 75时的CR，其他THI值对CR无影响。温度> 25℃时的CR低于温度为15-20℃和20-25℃时(P = 0.008)。7月CR最低(P = 0.003)。THI和宇称(P = 0.057和P = 0.001)、AT和宇称(P = 0.019和P = 0.001)对CR有显著影响;然而，这两个因素之间没有相互作用。综上所述，温度> 25°C和温度> 75°C对奶牛的CR结果有不利影响，但对小母牛没有不利影响。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.