Estimation of lactation yield from repeated measures of test day yields

D.L. Johnson

Livestock Improvement Corporation, Private Bag 3016, Hamilton, New Zealand.

Proceedings of the New Zealand Society of Animal Production, 1996, 56: 16-18

Test day production records were combined into a measure of lactation yield for the purposes of genetic evaluation of lactation production in dairy cattle. The lactation yield estimation adjusts for test day environment, standardises lactation length, takes account of culling and weights test day records according to number of tests, stage of lactation at test and intervals between tests. Any combination of tests can be used allowing for inclusion of records in progress or incomplete lactation in genetic evaluation.

Keywords: NZSAPAB; animal model; dairy; lactation yield; genetic evaluation.

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Last Updated 18-03-1997