Estimativas de (co)variâncias e predições de valores genéticos do consumo alimentar residual e características associadas em touros da raça nelore
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Data
2013-05-24
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Universidade Federal de Goiás
Resumo
Among various measures for assessing feed efficiency, consumption
residual feed (CAR) has highlighted as lacking correlation with
growth characteristics. Animals that exhibit negative CARs are
more efficient when compared to animals with positive CAR due to
consume less than the predicted amount for the same weight gain.
Selecting more efficient animals, have been not only reducing costs
production as well as reduced environmental impact because of the dimiuição
emission of greenhouse gases, manure production and pasture area.
The aim of this study was to estimate (co) variances, parameters and values
Genetic CAR and associated features, aiming at their inclusion in
breeding programs. Data from 238 bulls were analyzed
Nellore, from the breeding program Nellore
Qualitas. The MTDFREML application was used to estimate the components of
(co) variances, heritability and genetic and phenotypic correlations of
characteristics analyzed. The heritability values found for the
characteristics were generally moderate to low, probably by
small sample size of animals evaluated (n = 238). The inclusion of the
contemporary group of animals allowed to obtain results more
consistent estimates of parameters and predictions of genetic values
for the measures assessed. Comparison of phenotypic values and
predictions of genetic value for CAR showed that the phenotype of own
animal is a poor indicator of their genetic value, especially in cases
like this that the heritability of the trait analyzed was low (h² = 0.10).
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MORAIS, Lorraine Cristina Oliveira de. Estimativas de (co)variâncias e predições de valores genéticos do consumo alimentar residual e características associadas em touros da raça nelore. 2013. 64 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2013.