Breed and selection line differences in the temperament of beef cattle
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Universidade Estadual de Maringá
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The temperament of four beef cattle breeds were measured using a flight time test (FT) anda behavior score test (BST). FT was defined as the time taken by animals to cross a distance of 2 m afterweight scale. The BST used a visual assessment of cattle behavior in which the results of four categoriesdefined the score: movements, breathing intensity, vocalization and kicking. FT and BST coefficients ofheritability were estimated using the restricted maximum likelihood, considering half siblings. Caracupresented a lower BST value than the other breeds. Nellore presented intermediate results, followed byGuzerat and Gyr with similar and higher means (p < 0.05). Similar results were observed with FT, butCaracu and Nellore did not differ from each other. A low association between FT and BST was found (rp=-0.36; p < 0.01). The correlation between a sire’s ranking, according to the predicted breeding values (p)estimated for FT and BST, was moderate and negative (rs = -0.63; p < 0.001). Heritability estimates forFT and BST were 0.35 and 0.34, respectively. Inside Nellore breed, herds with different selection criteriafor weight were compared. Our results show that selection line based on weight might positively modulatetemperament of Bos indicus cattle.
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