Genetic parameters for milk yield, lactation length and calving intervals of Murrah buffaloes from Brazil
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Tarih
2013
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Revista Brasileira Zootecnia Brazilian Journal Animal Sci
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The major objective of this study was to estimate heritability and genetic correlations between milk yield (MY) and calving interval (CI) and lactation length (LL) in Murrah buffaloes using Bayesian inference. The database used belongs to the genetic improvement program of four buffalo herds from Brazil. To obtain the estimates of variance and covariance, bivariate analyses were performed with the Gibbs sampler, using the program MTGSAM. The heritability coefficient estimates were 0.28, 0.03 and 0.15 for MY, CI and LL, respectively. The genetic correlations between MY and LL was moderate (0.48). However, the genetic correlation between MY and CI showed large HPD regions (highest posterior density interval). Milk yield was the only trait with clear potential for genetic improvement by direct mass selection. The genetic correlation between MY and LL indicates that indirect selection using milk yield is a potentially beneficial strategy. The interpretation of the estimated genetic correlation between MY and CI is difficult and could be spurious.
Açıklama
Anahtar Kelimeler
genetic correlation, Gibbs sampler, heritability
Kaynak
Revista Brasileira De Zootecnia-Brazilian Journal of Animal Science
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
42
Sayı
8
