Estudo de sistemas polimórficos em bovinos da raça Nelore (Bos taurus indicus L.) associados à produção de carne. I. Hemoglobinas: Pesos e ganho de peso, do nascimento ao segundo parto

A sample of 114 females, from the herds of the Zertaozinho's Experiment Station (SP), maintained on range conditions, was used to observe the Castle-Hardy-Weingberg equilibrium for hemoglobin polymorphism. Another objective was to verify a possible relationship with growth traits like birth (PN), weaning (PD) and yearling weight (P18), gain from birth to weaning (GPND) and also 1st parturition (PAP1) and 2nd parturition (PAP2) weights. Statistical analyses were performed by least square means for unbalanced subclass numbers and the chi-square test was utilized to check the Castle-Hardy-Weinberg equilibrium. Adjusted means and standard errors for PN, PD, P18, PAP1, PAP2 and GPND were respectively: AA = 28,66 ± 1,39 kg; AB = 27,05 ± 1,27 kg; BB = 30,35 ± 2,82 kg; AA = 165,74 ± 6,11 kg; AB = 162,13 ± 5,62 kg; BB = 171,90 ± 12,42 kg; AA = 258,45 ± 6,74 kg; AB = 258,43 ± 6,20 kg; BB = 295,85 ± 13,71 kg; AA = 367,42 ± 9,71 kg; AB - 373,47 ± 8,97 kg; BB = 431,24 ± 19,77 kg; AA = 405,83 ± 17,85 kg; AB = 411,83 ± 16,38 kg; BB = 451,84 ± 34,37 kg; AA = 0,69 ± 0,02 kg; AB = 0,65 ± 0,02kg; BB = 0,75 ± 0,05 kg. The hemoglobin type influenced significantly the yearling weight and 1st parturition, and the highest means were for Hb-BB hemoglobin type. The phenotypic frequencies for the hemoglobin types were in equilibrium of Castle-Hardy-Weinberg.