Arquivo Brasileiro de Medicina Veterinária e Zootecnia
versión On-line ISSN 1678-4162
MAFFEI, W.E. et al. Animal reactivity in a mobile cage: a new methodology to access bovine temperament. Arq. Bras. Med. Vet. Zootec. [online]. 2006, vol.58, n.6, pp. 1123-1131. ISSN 1678-4162. http://dx.doi.org/10.1590/S0102-09352006000600022.
This paper describes a new methodology to access bovine temperament using it's reactivity eletronically measured as the intensity and count of movements in a mobile cage, using a scale from 1 to 9,999 points. The new trait, reactivity, was compared to two other traditional methods, flying speed and temperament scores. Six hundred and ten contemporary Nellores, with average age of 467 days and from two herds were used. Reactivity data did not fit Normal nor Poisson nor Negative Binomial Distibutions. Standartized reactivity data, neperian and base 10 log reactivity transformations were not successful in adjusting data to normal distribution. Reactivity presented large phenotipic variation, with average in the original scale of 534±447 points, median of 442, mode 372, range from 1 to 2,218 points and variation coefficient of 84%. Residual rank correlation between reactivity and temperament score vary from .75 to .85 (P<.001), and were larger than the ones between reactivity and flight speed and between flight speed and temperament score. The new methodology is efficient in measuring temperament of Nellore cattle and it has advantages in relation to the traits flight speed and temperament score. The measure of reactivity is easy, fast to get and safe to record. In addition, this trait presents large variability.
Palabras clave : bovine; animal reactivity; temperament.