Observations on the effect of method of management at mating on bovine fertility

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Abstract
1. The fertility records of two groups of bulls, one group used for controlled service, and one group used for free service, were compared over a period of one year.2. The fertility of the free-service group was consistently better except during the months of December, January, February and March.3. The difference in fertility between the two groups was correlated with the varying length of the oestral periods of the cows at different seasons of the year.4. It is suggested that the higher fertility in the free-service group was due to a closer relationship of service to the end of heat and thus to ovulation.

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