First heat detection in relation to moment of first insemination in lactating cows.
Keywords:
fertility traits, heritabilities, genetic correlations, dairy cows, first heatAbstract
Genetic parameters for the fertility traits interval between calving and first heat (ICH) and interval between calving and first insemination (ICI) were estimated. Data on ICH was derived from the Ovalert® system introduced by CRV. This system is using pedometers and registers the activity pattern of a cow. From this pattern the moment of estrus can be derived. The average ICH was at 55 days, ranging from 15 to 200 days. The average ICI was 78 days, ranging from 15 to 308 days. The heritability for ICH was 0.06, for ICI the heritability was 0.10. The genetic correlation between ICH and ICI was very strong (0.95). The correlation shows that the moment of first insemination is a close representation of the moment of the first heat.
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