Calving Interval and Survival Breeding Values as Measure of Cow Fertility in a Pasture-Based Production System with Seasonal Calving
نویسندگان
چکیده
منابع مشابه
Prediction Of Calving Interval And Survival Breeding Values For Foreign Bulls Without Daughters In Ireland
Poor cow fertility has been identified as a growing problem in Irish dairy herds. In this seasonal calving and the grass based production system, poor fertility results in a significant loss in farm income (Veerkamp et al., 2001) due to forced culling or a shift in calving pattern. In order to arrest this trend, subsequent calving interval (CIV) and survival to the next lactation (SUV) has been...
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Records of 594 calving dates and 493 calving intervals collected from a herd of Retinta beef cows in southwest Spain were studied. Their efficacy as reproductive measures were compared when a long breeding season was utilized. Variables used were date of present calving (DOC), date of subsequent calving (DOSC), time from start of breeding season to calving (TBSC), interval to next calving (CI),...
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Whether to select for longer life in the herd or shorter calving interval depends on the genetic and phenotypic relationships among herd life, amount of milk in first lactation, and calving interval. Herd life and average calving intmwal are essentially phenotypically uncorrelated. The phenotypic and genetic correlations of herd life and milk in first lactation ranged from .19 to .25 and from ....
متن کاملG enetic relationships between calving date, calving interval, age at first calving and type traits in beef cattle
In this paper the genetic relationships between major reproductive traits in beef cattle (Calving Date, Calving Interval and Age at First Calving) and type traits have been estimated to evaluate the usefulness of type classification in predicting reproductive performance in beef cattle. We estimated favourable genetic correlations between Calving Interval and type traits ranging from 2 0.027 to...
متن کاملManaging the Cow at Calving Time
Despite increased emphasis in recent years on declining dairy cow reproductive performance, there has been very little focus on the management of the periparturient dairy heifer and cow at calving time. Perhaps as a result, US producers are now reporting increasing perinatal calf losses at calving. A critical determinant in reducing periparturient losses is good calving management. The tenets o...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 2002
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(02)74125-8