Effect of climate factors on conception rate of lactating dairy cows in Mexico
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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.
KeywordsDairy cows Reproduction Conception rate Climate factors
- National Research Council, 1971. A guide to environmental research on animals, National Academy Press, Washington, DCGoogle Scholar
- National Research Council, 1981. Effect of environment on nutrient requirements of domestic animals, National Academy Press, Washington, DCGoogle Scholar
- Royal, M.D., Darwash, A.O., Flint, A.P.F., Webb, R., Woolliams, J.A. and Lamming, G.E., 2000. Declining fertility in dairy cattle: changes in traditional and endocrine parameters of fertility. Animal Science, 70, 487–501Google Scholar
- Silvia, W.J., 1998. Changes in reproductive performance of Holstein dairy cows in Kentucky from 1972 to 1996, Journal of Dairy Science, 81, 244Google Scholar