Article
Relationships between conception rate in Holstein heifers and cows and milk yield at various stages of lactation.
Animal : an international journal of animal bioscience - 1 Sept 2013
Hagiya K, Terawaki Y, Yamazaki T, Nagamine Y, Itoh F, Yamaguchi S, Abe H, Gotoh Y, Kawahara T, Masuda Y, Suzuki M
Abstract excerpt
We investigated the relationships between conception rates (CRs) at first service in Japanese Holstein heifers (i.e. animals that had not yet had their first calf) and cows and their test-day (TD) milk yields. Data included records of artificial insemination (AI) for heifers and cows that had calved for the first time between 2000 and 2008 and their TD milk yields at 6 through 305 days in milk (DIM) from first...
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