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Regulation of Estrous Behaviour in Dairy Cows
W.J. Silvia, K.K. Schillo
Department of Animal and Food Sciences
Project Description
An experiment to examine the relationship between endogenous concentrations of estradiol and intensity of estrus expression has been initiated. Sampling was completed on the last of 50 cows in January 2008. At this point, concentrations of hormones in blood samples are being measured. Estrus and ultrasound data are being evaluated. The data analysis phase of this project should be completed in June, 2008.
Impact
Previous studies from this project have demonstrated that experimentally induced endocrine deficiencies can result in reduced estrus expression and poor fertility. Results from the ongoing experiment will help to determine if these deficiencies occur naturally and if they contribute to reduced intensity and duration of estrus expression and poor fertility observed in modern dairy cows.