Genetic analysis of dairy cattle has been undertaken using an animal model including pedigree records since 1940 and performance records since 1986. The animal model analyses all breeds and breed crosses simultaneously allowing accurate estimation of hybrid vigour effects for milk production, liveweight, four survival traits and 16 linear type traits. The animal model allows the effects of induction, age at calving and herd- year-season to be taken into account when estimating an animal
Proceedings of the New Zealand Society of Animal Production, Volume 56, , 12-15, 1996
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