Summer “Stress” and Reproduction Indicators in the Cow for Milk Production

Ermal Yzeiraj, Vangjel Ceroni, Erinda Lika


The cow breeding sector is evolving continuously in response to the rapid growth in demand for livestock products. Increased environment temperature in summer season affect the overall clinical indicators and displays negative consequences on the production and reproduction of animals. In condition of our country, the greatest impact of heat stress in summer affect in the overall clinical indicators. Animal temperature increase by 0.2 to 0.4 ° C, frequency of breathing increases by 3.2 to 4.3 acts on the respiratory minute and the average value of the pulse increases to 2.4 to 4.1 pulsacione per minute. Under the influence of heat stress in the summer season varying the reproductive indexes. The duration of the oestral cycle is increased by 1.2 to 2.2 days, the time of oestrus decreases by 2 to 5 hours, the percentage of fertilization decreases by 20%, but the average time of the first heat show is not affected (before the service period).  

Keywords: "stress" of heat, milk cow, clinical indication, oestrus, paraservis period, percentage of fertilization.

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Al-Haidary, A. A., D. E. Spiers, G. E. Rottinghaus, and G. B. Garner. (1995). Effect of administration of ergovaline on the thermoregulatory functions of beef calves under heat stress. J. Anim. Sci. 73(Suppl. 1):132.

Alvarez, M. B., and H. D. Johnson. (1973). Environmental heat exposure on cattle plasma catecholamine and glucocorticoids. J. Dairy Sci. 56:189−194.

Berman, A. (2005). Estimates of heat stress relief needs for Holstein dairy cows. J. Anim. Sci. 83:1377-1384.

Chose L. E. (2007); Heat stress in dairy cattle. ppt.

Fox, D.G. and T.P. Tylutki. (1998). Accounting for the effects of environment on the nutrientrequirements of dairy cattle. J. Dairy Sci. 81:3085-3095.

Joe W. West. (1999). Nutritional Strategies for Managing the Heat-Stressed Dairy Cow1. J. anim. Sci.77:21-35.

Kibler, H. H., and S. Brody. (1953). Influence of humidity on heat exchange and body temperature regulation in Jersey, Holstein, Brahman and Brown Swiss cattle. Missouri Agric. Exp. Sta. Bull. No. 522. Columbia.

Kume, S., M. Kurihara, S. Takahashi, M. Shibata, and T. Aii. (1987). Effect of hot environmental temperature on major mineral balance in lactating cows. Jpn. J. Zootech. Sci. 58:764−770.

Larry E. (2007). Climate Change Impacts on Dairy Cattle. Department of Animal ScienceCornell University, Ithaca, NY 14853

Maust, L. E., R. E. McDowell, and N. W. Hooven. (1972). Effect of summer weather on performance of Holstein cows in three stages of lactation. J. Dairy Sci. 55:1133−1139.

NRC. (1989). Nutrient Requirements of Dairy Cattle. 6th rev. ed.Natl. Acad. Sci., Washington, DC.

West, J. W., G. M. Hill, P. Mandebvu, J. M. Fernandez, and B. G. Mullinix. (1998). Effects of dietary fiber on intake, milk yield, and digestion by lactating dairy cows during cool or hot, humid weather. J. Dairy Sci. (In press).

Yadav B, Singh G, Verma AK, Dutta N and Sejian V. (2013). Impact of heat stress on rumen functions.Veterinary World,6 (12): 992-996.



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