Villa-Mancera Abel, Méndez-Mendoza Maximino, Huerta-Crispín Rubén, Vázquez-Flores Felicitas, Córdova-Izquierdo Alejandro
Laboratorio de Genética y Reproducción, Facultad de Medicina Veterinaria y Zootecnia, Benemérita Universidad Autónoma de Puebla, 4 Sur 304 Col. Centro, CP 75482, Tecamachalco, Puebla, Mexico.
Trop Anim Health Prod. 2011 Mar;43(3):597-601. doi: 10.1007/s11250-010-9737-5. Epub 2010 Nov 18.
The purpose of this study was to investigate the relationship between conception rate (CR) and climate variables. Data consisted of 24,380 inseminations of Holstein dairy herd in Hidalgo, Mexico. Weather records, including daily temperature (T), relative humidity (RH), rainfall, wind speed, and solar radiation, were obtained from a nearby weather station. Means for each climatic variable from 2 days before artificial insemination (AI) to the AI day were calculated for each conception date represented in the study. A significant negative correlation was observed between the CR and mean and minimum T, mean and minimum RH, mean and minimum temperature-humidity index (THI), and rainfall. The overall mean CR was 34.3%. The CR in lactating dairy cows followed a seasonal pattern, lower CRs were observed in summer months than during winter (32.1% vs. 36.9%; P<0.01). The variables that had the greatest influence on CR were minimum and maximum T, minimum RH, minimum THI, wind speed, and rainfall.
本研究的目的是调查受胎率（CR）与气候变量之间的关系。数据包括墨西哥伊达尔戈州荷斯坦奶牛群的24380次人工授精记录。天气记录，包括每日温度（T）、相对湿度（RH）、降雨量、风速和太阳辐射，来自附近的气象站。对于研究中每个受孕日期，计算从人工授精（AI）前2天到AI当天的每个气候变量的平均值。观察到CR与平均和最低温度、平均和最低相对湿度、平均和最低温湿度指数（THI）以及降雨量之间存在显著负相关。总体平均CR为34.3%。泌乳奶牛的CR呈现季节性模式，夏季的CR低于冬季（32.1%对36.9%；P<0.01）。对CR影响最大的变量是最低和最高温度、最低相对湿度、最低THI、风速和降雨量。
