Browsing College of Agriculture by Author "El-Zarkouny, S. Z."

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Increasing pregnancy rates at first service in dairy cows exposed to high ambient temperatures before and after calving

Cartmill, J. A.; Rozell, T. G.; El-Zarkouny, S. Z.; Smith, J. F.; Stevenson, J. S. (Kansas Agricultural Experiment Station and Cooperative Extension Service, 1999)

Cows exposed to heat stress before or after calving or both are prone to reduced fertility because of reduced expression of estrus and less embryonic survival if pregnant. Cows calving on three dairy farms during the ...
Pregnancy rates in dairy cattle after three different, timed, breeding protocols

Cartmill, J. A.; El-Zarkouny, S. Z.; Lamb, G. C.; Stevenson, J. S. (Kansas Agricultural Experiment Station and Cooperative Extension Service, 1999)

Synchronizing ovulation enables dairy producers to inseminate cows by appointment rather than after detected estrus. Three different, timed artificial insemination protocols using different combinations of prostaglan ...
Supplemental progesterone increases pregnancy rates and embryo survival in lactating dairy cows

El-Zarkouny, S. Z.; Cartmill, J. A.; Stevenson, J. S. (Kansas Agricultural Experiment Station and Cooperative Extension Service, 1999)

Administering progesterone to lactating dairy cows has sometimes proven effective in increasing pregnancy rates. In this study, cows were treated with the Ovsynch protocol in addition to supplemental progesterone given ...

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