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O efeito direto da raça Red Angus (<img width=32 height=32 id="_x0000_i1026" src="../../../../img/revistas/rbz/v28n3/a10s1.gif" align=absbottom>), computado como desvio a partir do efeito direto Nelore (<img width=32 height=32 id="_x0000_i1027" src="../../../../img/revistas/rbz/v28n3/a10s2.gif" align=absbottom>), e os efeitos das heterozigoses individual (<img width=32 height=32 id="_x0000_i1028" src="../../../../img/revistas/rbz/v28n3/a10s6.gif" align=absbottom>) e materna (<img width=32 height=32 id="_x0000_i1029" src="../../../../img/revistas/rbz/v28n3/a10s4.gif" align=absbottom>), resultantes do cruzamento entre essas duas raças, foram estimados. Foi usado o método da regressão múltipla para analisar os pesos ao nascimento (PNT), à desmama (PDS) e aos 12 meses (P12M) e os ganhos de peso médios diários do nascimento à desmama (GMD_ND) e da desmama aos 12 meses (GMD_DA). Um total de 410 bezerros dos grupos Nelore, 1/2 Red Angus+1/2 Nelore, 3/4 Nelore+1/4 Red Angus e 3/4 Red Angus+1/4 Nelore, nascidos no período de 1985 a 1995, na Estação Experimental Paranavaí, no Noroeste do Estado do Paraná-Brasil, forneceu os dados para estudo. O PDS e o GMD_ND foram corrigidos para 205 dias de idade e o P12M e o GMD_DA, para 365 dias de idade. O efeito direto da raça Angus (<img width=32 height=32 id="_x0000_i1030" src="../../../../img/revistas/rbz/v28n3/a10s5.gif" align=absbottom>) não mostrou significância para qualquer característica analisada. O efeito da heterozigose indivdual (<img width=32 height=32 id="_x0000_i1031" src="../../../../img/revistas/rbz/v28n3/a10s6.gif" align=absbottom>) foi significativo para todas as características, exceto para o PNT. Os coeficientes de regressão parcial do PDS, GMD_ND, P12M e GMD_DA sobre a fração esperada de loci heterozigotos no genótipo do bezerro foram: 31±6 kg, 0,143±0,028 kg, 55±7 kg e 0,126±0,032 kg. O efeito da heterozigose materna (<img width=32 height=32 id="_x0000_i1032" src="../../../../img/revistas/rbz/v28n3/a10s7.gif" align=absbottom>) mostrou significância para PNT, PDS, GMD_ND e P12M. Os correspondentes coeficientes de regressão parcial foram 2,8±0,7 kg, 27±4 kg, 0,117±0,019 kg e 19±5 kg. The direct effect of Red Angus (<img width=32 height=32 id="_x0000_i1034" src="../../../../img/revistas/rbz/v28n3/a10s1.gif" align=absbottom>), computed as deviation from the direct effect of Nellore (<img width=32 height=32 id="_x0000_i1035" src="../../../../img/revistas/rbz/v28n3/a10s2.gif" align=absbottom>), and the effects of individual (<img width=32 height=32 id="_x0000_i1036" src="../../../../img/revistas/rbz/v28n3/a10s6.gif">) and maternal (<img width=32 height=32 id="_x0000_i1037" src="../../../../img/revistas/rbz/v28n3/a10s4.gif" align=absbottom>) heterozygosity, resulting from crossing these breeds were estimated. The multiple regression method was used to analyze birth weight (PNT), weaning weight (PDS), yearling weight (P12M), and for the daily weight gain from birth to weaning time (GMD_ND) and from weaning to 12 months (GMD_DA). A total of 410 calves from the groups of Nellore, 1/2 Red Angus+1/2 Nellore, 3/4 Nellore+1/4 Red Angus and 3/4 Red Angus+1/4 Nellore, raised at Estação Experimental Paranavaí, in the North-West of Paraná State-Brazil, from 1985 to 1995, supplied the data for the study. Weaning weight and GMD_ND were corrected for 205 days of age and P12M and GMD_ DA were corrected for 365 days of age. The direct effect of the Angus breed (<img width=32 height=32 id="_x0000_i1038" src="../../../../img/revistas/rbz/v28n3/a10s1.gif" align=absbottom>) did not show significance for any of the studied traits. The individual heterozygosity effect (<img width=32 height=32 id="_x0000_i1039" src="../../../../img/revistas/rbz/v28n3/a10s6.gif" align=absbottom>) was significant for all traits, except for PNT. The partial regression coefficients of PDS, GMD_ND, P12M and GMD_DA upon the expected fraction of heterozygous loci in the genotypes of the calves were 31±6 kg, .143 ± .028 kg, 55±7 kg and .126± .032 kg. The maternal heterozygosity effect (<img width=32 height=32 id="_x0000_i1040" src="../../../../img/revistas/rbz/v28n3/a10s7.gif" align=absbottom>) was significant for PNT, PDS, GMD_ND and P12M. The corresponding partial regression coefficients were 2.8±0.7 kg, 27±4 kg, .117±.019kg and19±4 kg

Efeitos da raça e da heterozigose sobre características ponderais de bezerros Nelore e mestiços Red Angus x Nelore