Abstract

LOPEZ, María V.; ARIAS MANOTTI, Adolfo A.  and  SLOBODZIAN, Ana. Análisis multicaracter para estimar parámetros genéticos para crecimiento en bovinos de raza Braford en Corrientes. BAG, J. basic appl. genet. [online]. 2007, vol.18, n.1, pp.31-37. ISSN 1852-6233.

This study was carried out at INTA Corrientes Experimental Station with data from a stabilized Braford 3/8 Brahman x 5/8 Hereford herd. The objective was to estimate the genetic and environmental parameters for birth weight (PNAC), weight adjusted to 210 days of age (P_AJ_210), and weight adjusted to 570 days of age (P_AJ_570). We used a Multivariate Animal Model and MTDFREML software. A database of growth and genealogy data from 658 samples of Braford males and females corresponding to the period 1992-2004 was processed. Estimates of variance and covariance components and the genetic and environmental parameters were: a) For PNAC: s²_a = 6,57, s² m = 2,21, s_am = -0,32, s²_pe = 0,72, s²_e = 7,31, s²_p = 16,50, h²_a = 0,40, h²_m = 0,13, r_am = -0,09, c² = 0,04, e² = 0,44; b) For P_AJ_210: s²_a = 153,89, s²_m = 62,18, s_am = -56,47, s²_pe = 10,35, s²_e = 223,05, s²_p = 393,02, h²_a = 0,39, h²_m = 0,16, r_am = -0,58, c² = 0,02, e² = 0,57; c) For P_AJ_570: s²_a = 292,95, s²_e = 419,02, s²_p = 711,97, h²_a = 0,41, e² = 0,59. Genetic correlations among the characters analyzed were also calculated: PNAC-P_AJ_210: 0,83, PNAC-P_AJ_570: 0,31, P_AJ_210-P_AJ_570: 0,74. Finally, the genetic value of each individual was obtained (Expected Progeny Differences - EPDs). The combination of these values will allow to improve the characteristics of this breed.

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

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