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Article

Bivariate analysis of conception rates and test-day milk yields in Holsteins using a threshold-linear model with random regressions.

Journal of dairy science - 1 Jun 2009

Tsuruta S, Misztal I, Huang C, Lawlor T J

Abstract excerpt

The objective of this study was to estimate genetic correlations between conception rates (CR) and test-day (TD) milk yields in Holsteins for different days in milk (DIM) in small and large herds. The data included 217,213 first-parity service records of 94,984 cows in New York State between 1999 and 2003. The CR was defined as the outcome of a single insemination. Conception rate and TD milk were analyzed using...

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PMID: 19448025
DOI: 10.3168/jds.2008-1707

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