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Conception rates of Holstein bulls for artificial insemination on a California dairy

, : Conception rates of Holstein bulls for artificial insemination on a California dairy. Journal of Dairy Science 63(4): 621-626

Data of milk yield and reproduction were collected from a 2500-cow dairy farm in California to measure conception rates of bulls for AI. The bulls were placed into groups of low, medium, or high conception rates. Mean conception rates were 38.2%, 55.7%, and 66.1%, range 34-70%. To predict the conception-rate group of a bull required 30 services. There was no differences in av. number of lactations and days to 1st service of cows bred to the 3 groups of bulls.


PMID: 7381086

DOI: 10.3168/jds.S0022-0302(80)82981-X

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