Abstract
The objective of the present study was to estimate the allele and genotype frequencies of the CSN3/HinfI and LGB/HaeIII gene polymorphisms in beef cattle belonging to different genetic groups, and to determine the effects of these polymorphisms on growth and carcass traits in these animals, which are submitted to an intensive production model. Genotyping was performed on 79 Nelore, 30 Canchim (5/8 Charolais + 3/8 Zebu) and 275 crossbred cattle originating from the crosses of Simmental (n = 30) and Angus (n = 245) sires with Nelore females. Body weight, weight gain, dressing percentage, longissimus dorsi area and backfat thickness were fitted using the GLM procedure, and least square means of the genotypes were compared by the F test. The results showed that the CSN3/HinfI and LGB/HaeIII polymorphisms did not have any effect on growth or carcass traits (p > 0.05).
Highlights
“Super-young” steers are animals finished on feedlot immediately after weaning and slaughtered as 13 montholds at the most, weighing at least 450 kg
The κ-casein (CSN3) and β-lactoglobulin (LGB) genes are expressed in milk and are important in the evaluation of the milk production potential and milk fat and protein percentage, indicating a maternal ability in beef cattle and representing candidate genes for growth traits
At the beginning of the study, the animals were individually identified, treated against endoand ectoparasites, divided into groups of five animals each in pen according to breed and size, and fed diets formulated according to the recommendations of the National Research Council (NRC, 1996) for an average daily gain higher than 1.2 kg
Summary
“Super-young” steers are animals finished on feedlot immediately after weaning and slaughtered as 13 montholds at the most, weighing at least 450 kg. The objectives of the present study were to estimate the allele and genotype frequencies of CSN3 and LGB gene polymorphisms in beef cattle belonging to different genetic groups and to determine the effects of these polymorphisms on production traits in these animals which are submitted to a “super-young” production model.
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