Temperamento em bubalinos: testes de mensuração Temperament in buffalos: mensurament tests

O objetivo neste trabalho foi avaliar a aplicabilidade, para búfalos (Bubalus bubalis), de testes de avaliação de temperamento, utilizados para bovinos. Foram avaliados os testes de docilidade, teste de reação a objetos novos, de tronco e de isolamento social em 12 bezerros e suas 12 mães, separadamente. Tanto os bezerros como suas mães responderam a todos os testes com vários comportamentos. Para os bezerros e as mães, os testes que promoveram maior número de comportamentos foram o de tronco e de reação a objetos novos. Houve diferenças individuais (coeficiente de variação de 32-51%) nos resultados de todos os testes tanto nos bezerros como nas mães. Os resultados individuais, em testes de isolamento social e de reação a objetos novos apresentaram correlação positiva tanto com as mães (rs = 0,76, P< 0,01) quanto com os bezerros (rs = 0,66, P< 0,01). Baseados em sensibilidade, relevância e aplicabilidade, o teste de isolamento social e o teste de tronco podem ser sugeridos para avaliarem o temperamento de bubalinos.<br>The objective of this study was to assess the applicability of temperament tests commonly used in bovines for water buffaloes (Bubalus bubalis). The tests for docility, reaction to a novel object, squeeze cage and social isolation were applied individually with 12 calves and their 12 mothers. Both calves and their mothers responded to all tests with a variety of behaviors. The tests that elicited the larger number of behaviors were the squeeze cage and the novel object. There were large individual differences (coefficients of variation of 32-51%) in the scores for all tests for calves and adults. The individual scores for the tests of isolation and novel object were significantly correlated for calves (rs = 0.66, P< 0.01) and adults (rs = 0.76, P< 0.01). Using the criteria of sensitivity (range of individual differences), responsiveness and applicability, the squeeze cage test and the isolation test seem well suited for water buffaloes

Reactivity, performance, color and tenderness of meat from Zebu cattle finished in feedlot

The objective of this study was to study the animal reactivity and correlate it with performance and meat quality of cattle finished in feedlots. A total of 20 animals of the Tabapuã breed and 20 animals of the Nellore breed were confined for 112 days: 28 days of adaptation and 84 days of data collection. Performance was determined by the average daily weight gain (ADG) and average dry matter intake (DMI) estimated through the use of indicators. On the 1st, 42nd and 84th days of the experiment, two methods were used to measure the animal reactivity: animal reactivity in mobile cage and visual reactivity during handling. The characteristics of meat quality were evaluated by the color, shear force and pH24 after slaughter (pH24). Through the study of correlation, the degree and direction of linear association on animal reactivity, performance and meat quality were established. Regression equations were generated for the parameters evaluated according to the values of animal reactivity. Correlations between mobile cage and visual reactivity were 0.77, 0.56 and 0.45 in the 1st, 2nd and 3rd evaluations, respectively. There was no correlation between animal reactivity and DMI. The correlations between ADG, pH24, and color with animal reactivity were -0.31, 0.40, 0.47 and -0.34, and -0.33 for mobile cage, 0.74, 0.71 and -0.51, for visual reactivity, respectively. The parameters of meat quality varied according to the reactivity. Undesirable values of pH24, animal reactivity and color were found when mobile cage reactivity was higher than 780, 590 and 540, respectively. In general, animals that show greater reactivity tend to have lower daily weight gain and lower meat quality. The reactivity can be used in animal breeding programs, in order to improve performance and meat quality of Zebu cattle finished in feedlot