Connectedness in Across Herd Genetic Evaluations
نویسنده
چکیده
Across herd genetic evaluation using BLUP procedures allows individuals from different herds to be validly compared in their relative genetic merit. The potential advantages of across herd analyses to the industry as a whole has meant that such analyses are routinely conducted in Canada and European countries. In Australia, across herd evaluations will become a major tool for small scale breeders wishing to maintain their competitiveness against larger, more economically efficient breeding companies.
منابع مشابه
Effect of unfavourable population structure on estimates of heritability, systematic effects and breeding values (In memory of the beloved colleague Alexandros Argyrokastritis)
Empirical estimations of heritability, systematic effects and predictions of sires’ breeding values (BVs) were obtained under various population structures for simulated populations consisted of n=400 animals in 5 herds for a trait of medium heritability (h=0.30). An infinitesimal additive genetic animal model was assumed while simulating data. Population structure was varied to allow for good ...
متن کاملTrends of the genetic connectedness measures among Nelore beef cattle herds.
Validity of comparisons between expected breeding values obtained from best linear unbiased prediction procedures in genetic evaluations is dependent on genetic connectedness among herds. Different cattle breeding programmes have their own particular features that distinguish their database structure and can affect connectedness. Thus, the evolution of these programmes can also alter the connec...
متن کاملFactors influencing genetic evaluations of linebred Hereford cattle in diverse environments.
Data from four closely related Line 1 Hereford herds were used to estimate variance components and predict EPD for birth weight (BWT), weaning weight (WWT), and postweaning gain (PWG). Herds were located in diverse environments and differed in level of phenotypic performance. Within-herd BWT analyses considered effects of inbreeding of calf and dam, sex, age of dam (AOD), and contemporary group...
متن کاملEFFECT OF SMALL-HERD CLUSTERING ON THE GENETIC CONNECTEDNESS OF THE PORTUGUESE HOLSTEIN CATTLE POPULATION J.Vasconcelos and J.Carvalheira
no. 424; Session G4.44 [email protected] EFFECT OF SMALL-HERD CLUSTERING ON THE GENETIC CONNECTEDNESS OF THE PORTUGUESE HOLSTEIN CATTLE POPULATION J.Vasconcelos and J.Carvalheira Centro Investigação em Biodiversidade e Recursos Genéticos (CIBIO), Universidade do Porto, Rua Padre Armando Quintas, 4485-661 Vairão, PORTUGAL, ICBAS-Universidade do Porto INTRODUCTION Accuracy of genetic evaluat...
متن کاملGenetic evaluation of herd life in Canada: Current status and future outlook
Official genetic evaluations for dairy sires have been published in Canada since the winter of 1996. Evaluations are available for five major breeds (Ayrshire, Brown Swiss, Guernsey, Holstein, and Jersey). The most recent evaluation for Holsteins included records from 1,652,884 daughters of 80,197 sires, of which 5900 were eligible for official publication. Published evaluations combine informa...
متن کامل