作者: M. Haile-Mariam , J.M. Morton , M.E. Goddard
DOI: 10.1017/S1357729800053297
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摘要: Fertility data collected on 17131 Holstein-Friesian cows from 158 dairy herds in Australia were used to estimate heritabilities for and correlations among several fertility traits using a sire model. Pregnancy rate (PR), survival (Surv), calving interval (CI), first service (CFS), insemination (coded as 1 if cow received or 0 otherwise) (InsemR) non-return (FNRR) the main analysed six-trait Among traits, CFS had highest h(2) (0.13) FNRR lowest (0.01). Genetic higher than environmental all cases. The genetic of PR with InsemR, FNRR, CFS, CI Surv 0.74, 0.79 -0.84, -0.57, 0.67, respectively. correlation between InsemR was high (-0.95) indicating that they almost measure same trait. Analysis did not return after despite being pregnant (so-called 'phantom' syndrome) showed syndrome is heritable. relatively such can be extracted milk recording obtained mating suggests routine evaluation sires daughter based these implemented national selection programs.