Genetic parameters for growth, reproductive and maternal traits in a multibreed meat sheep population.
AUTOR(ES)
LÔBO, A. M. B. O.
FONTE
Genetics and Molecular Biology
DATA DE PUBLICAÇÃO
2011
RESUMO
The genetic parameters for growth, reproductive and maternal traits in a multibreed meat sheep population were estimated by applying the Average Information Restricted Maximum Likelihood method to an animal model. Data from a flock supported by the Programa de Melhoramento Genético de Caprinos e Ovinos de Corte (GENECOC) were used. The traits studied included birth weight (BW), weaning weight (WW), slaughter weight (SW), yearling weight (YW), weight gain from birth to weaning (GBW), weight gain from weaning to slaughter (GWS), weight gain from weaning to yearling (GWY), age at first lambing (AFL), lambing interval (LI), gestation length (GL), lambing date (LD - number of days between the start of breeding season and lambing), litter weight at birth (LWB) and litter weight at weaning (LWW). The direct heritabilities were 0.35, 0.81, 0.65, 0.49, 0.20, 0.15 and 0.39 for BW, WW, SW, YW, GBW, GWS and GWY, respectively, and 0.04, 0.06, 0.10, 0.05, 0.15 and 0.11 for AFL, LI, GL, LD, LWB and LWW, respectively. Positive genetic correlations were observed among body weights. In contrast, there was a negative genetic correlation between GBW and GWS (-0.49) and GBW and GWY (-0.56). Positive genetic correlations were observed between AFL and LI, LI and GL, and LWB and LWW. These results indicate a strong maternal influence in this herd and the presence of sufficient genetic variation to allow mass selection for growth traits. Additive effects were of little importance for reproductive traits, and other strategies are necessary to improve the performance of these animals.
ASSUNTO(S)
genética animal herdabilidade peso ao nascer ovino peso de leitegada genetic correlation sheep age heritability body weight litter weight
ACESSO AO ARTIGO
http://www.alice.cnptia.embrapa.br/handle/doc/578074Documentos Relacionados
- Genetic parameters for growth, reproductive and maternal traits in a multibreed meat sheep population
- Aromatase gene and its effects on growth, reproductive and maternal ability traits in a multibreed sheep population from Brazil
- Genetic parameters of wool colour and skin traits in Corriedale sheep
- Estimation of genetic parameters for weight traits and Kleiber Index in a Brahman cattle population
- Genetic parameters, genetic trends, and principal component analysis for productive and reproductive traits of Guzera beef cattle