47 research outputs found

    Population genetic evaluation for weaning weight of different beef cattle breeds

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    Population genetic analysis was performed on data from 42,695 purebred beef calves from seven breeds born from 1981 to 2005 in Hungary. Animal model were used for the estimations. Sire, herd, age of dam at calving, birth year, season of birth and sex of calf had significant effects on 205-day calf weaning weight for each breed. Direct heritability value estimates (h2d) were 0.18 to 0.61, the maternal heritability values (h2m) from 0.07 to 0.38, and the total heritability values were between 0.09 and 0.35. The direct-maternal genetic correlations (rdm) were high and negative for all the breeds varying from -0.63 to -0.88

    HĂșshasznĂș tenyĂ©szbikĂĄk rangsora ivadĂ©kaik teljesĂ­tmĂ©nye alapjĂĄn becsĂŒlt tenyĂ©szĂ©rtĂ©kek alapjĂĄn

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    The objective of this study was to rank Limousin sires by their different breeding values based on the weaning weight of their progeny. 205-day weaning weight record of altogether 18746 purebred and crossbred calves sired by breeding bulls of the mentioned breed were used for the estimation. Calves were belonging to three different groups by their genotype. Three different BLUP animal models were used for the estimation. According the results the direct heritability (h2 d ) estimates of 205-day weight ranged between 0.49 and 0.59, while that of the maternal heritability (h2 m) between 0.24 and 0.45. The estimated breeding value of the given sires differed by the genotype (purebred or crossbred) of their progeny calves and the method of estimation. Also, there were differences in the rank of the sires depending on the genotype of their progeny, as well as the estimation methodsA munka cĂ©lja limousin apĂĄk rangsorĂĄnak a meghatĂĄrozĂĄsa volt ivadĂ©kaik vĂĄlasztĂĄsi sĂșlyadataibĂłl becsĂŒlt tenyĂ©szĂ©rtĂ©kek alapjĂĄn. A szĂĄmĂ­tĂĄsokhoz 18746 fajtatiszta Ă©s keresztezett borjĂș 205 napra korrigĂĄlt vĂĄlasztĂĄsi sĂșlyadatĂĄt hasznĂĄltĂĄk fel. A borjakat genotĂ­pusuk alapjĂĄn hĂĄrom csoportra osztottĂĄk. A szĂĄmĂ­tĂĄsokat hĂĄrom kĂŒlönbözƑ BLUP egyedmodellel vĂ©geztĂ©k. Az eredmĂ©nyek alapjĂĄn a 205 napra korrigĂĄlt vĂĄlasztĂĄsi sĂșly direkt öröklƑdhetƑsĂ©ge (h2 d) 0,49 - 0,59 között vĂĄltozott. Az anyai öröklƑdhetƑsĂ©g (h2 m) 0,24 - 0,45 közötti volt. Az apĂĄk tenyĂ©szĂ©rtĂ©ke között szĂĄmottevƑ kĂŒlönbsĂ©get talĂĄltak annak a fĂŒggvĂ©nyĂ©ben, hogy azt milyen adatbĂĄzison, melyik mĂłdszerrel becsĂŒltĂ©k. Az eredmĂ©nyek alapjĂĄn megĂĄllapĂ­thatĂł, hogy az apĂĄk tenyĂ©szĂ©rtĂ©keik alapjĂĄn felĂĄllĂ­tott rangsora eltĂ©rt egymĂĄstĂłl
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