Comparison of pregnancy rates, progesterone concentrations, and expression of genes associated with progesterone synthesis in heifers and mature cows
It has been reported world wide that over the past fifty years production has dramatically increased in dairy cattle but at the same time fertility rates have steadily declined, particularly in mature cows. Fertility of heifers that were bred for the first time has not been affected. One of the maj...
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| Language: | English |
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University of British Columbia
2008
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| Online Access: | http://hdl.handle.net/2429/1508 |