Factors affecting AB conception rates in cattle
A. Visser, P. Shannon and B.W. Wickham
Livestock Improvement Division, New Zealand Dairy Board,
Hamilton
Proceedings of the New Zealand Society of Animal Production.
1988, 48: 61-64
Mating records from Dairy Board files for 1984 were analysed.
First inseminations with liquid semen were considered, and the effect of
several factors on conception analysed. Conception was scored as 1 if a
calving occurred 272 to 293d after insemination, and 0 if a calving
occurred outside that interval. Only records from animals with a known
calving date were included. The data were analysed by linear model
techniques, with conception as a dependent variable.
The factors contributing to variation in conception were (in order of
declining importance): herd, technician, post-partum interval, service
sire and age of cow. The R2 was 0.072 indicating that most of the
variation is caused by binomial error.
Keywords: NZSAPAB;
Conception rate
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Last Updated 18-03-1997
