Genetic parameters and trends for birth weight, birth coat score and weaning weight in Merino lines divergently selected for ewe multiple rearing ability

afrique du sud agneau birth weight comportamiento maternal comportement maternel cordero distance génétique distancia genética genetic distance genetic parameters gestation multiple heritability héritabilité laine lambs lana maternal behaviour multiple births ovin ovinos paramètre génétique partos múltiples parámetros genéticos peso al destete peso al nacimiento poids au sevrage poids à la naissance sheep south africa sudáfrica weaning weight wool