Abstract

LOPEZ, María V.; ARIAS MANOTTI, Adolfo A.  and  SLOBODZIAN, Ana. Parámetros genéticos y ambientales para caracteres de crecimiento en bovinos de raza Hereford en la provincia de Corrientes, Argentina. BAG, J. basic appl. genet. [online]. 2007, vol.18, n.2, pp.39-49. ISSN 1852-6233.

The objective of this research was to estimate genetic and environmental dispersion parameters of Hereford cattle raised in Corrientes, a subtropical province in Northeastern Argentina. Data were taken in INTA EEA Corrientes between 1974 to 2002. Records were 4990 weaning weights adjusted to 210 days (WW210) and 3440 weights adjusted to 570 days of age (W570). Data were analyzed using single trait animals models with maternal effects for WW210. For WW210 the model included fixed effects of contemporary group (herd by year of birth by sex subclasses), month of birth, age of dam, prior lactation status of the cow. Whereas for W570 the fixed effects were contemporary group, month of birth, and age in days of the individual at final weight as a covariable. The method of estimation was REML by means of the derivative free algorithm implemented in the MTDFREML package. The random effects were direct and maternal breeding values and permanent environment of the dam for WW210, and direct breeding values for W570. The estimates of (co)variance components, and genetic and environmental parameters obtained were: a) For W210: ó²_a = 68,45, ó²_m = 113,29, ó_am = -14,51, ó²_pe = 54,73, ó²_e = 214,93, ó²_p = 436,90, h²_a = 0,16, h²_m = 0,26, r_am = -0,16, c² = 0,12, e² = 0,49; b) For weight adjusted to 570 days: ó²_a = 480,03, ó²_e = 320,47, ó²_p = 800,50, h²_a = 0,60, e² = 0,40. The estimated values of the (co)variance components suggest that selection for growth traits is feasible in this subpopulation.

Keywords : Modelo animal; Parámetros genéticos y ambientales; Bovinos para carne; Hereford; Peso ajustado a 210 días; Peso ajustado a 570 días.

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