Abstract

HERNANDEZ, A. et al. Genetic parameters in milk production and longevity traits of Mambí de Cuba cows. Arch. zootec. [online]. 2011, vol.60, n.231, pp.513-520. ISSN 1885-4494.  https://dx.doi.org/10.4321/S0004-05922011000300040.

Data from 6335 cows of the Mambí de Cuba (3/4 Holstein 1/4 Zebu) breed from four genetic enterprises, with calving in the years from 1980 to 2005 were used to estimate the heritabilities and the genetic and phenotypic correlations of milk production in the first lactation (LPL), the total milk production accumulated for life (LTV), productive life (VP) and stayability for 36 month of productive life (HP36). The MTDFREML program was used to estimate the variance component using uni or bivariate animal model that included the fixed effect of herd-years-season of first calving, the age to first calving as lineal and quadratic covariable, and as random effect the animal and the residual. The means for LPL, LTV, VP and P36 were of 1990.9 kg, 9749.5 kg, 69.7 month, 0.77% and the heritabilities were of 0.15±0.03, 0.10±0.03, 0.05±0.02, 0.008±0.013. The genetic correlations of milk production acumulated for life with the longevity traits were high (0.59 and 0.80) and those between milk production in the first lactation and the longevity traits were low and antagonic (-0.13 and -0.16). In the genetic improvement of breed for selecting the future sire, besides milk production, traits that guarantee the stayability of the animals in the herd should be included.

Keywords : Genetic correlation; Tropic.

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