Resumo

PARES-CASANOVA, Pere M  e  CABALLERO, Marta. Possible tendency of polled cattle towards larger ears. Rev Colom Cienc Pecua [online]. 2014, vol.27, n.3, pp.211-225. ISSN 0120-0690.

Background: the anatomy and physiology of bovid horns are consistent with their thermoregulatory function. Objective: to evaluate a possible correlation between ear and horn size, as key factors for body thermoregulation. Methods: measurements of horns (length and perimeter) and ears (length and width) were obtained from forty-six Pyrenean Brown (Bruna dels Pirineus) beef calves. The sample was randomly distributed between horned (n=34) and polled (n=12) animals, aged 332 ± 56 days. Results: a negative correlation between ear and horn size was observed (p<0.05) and the multivariate clustering demonstrated a tendency of polled animals towards bigger ear size. Conclusions: according to these results, horns and ears contribute to thermoregulation; this function is not therefore solely a function of big or small horns, as has normally been stated to be the case. Although the sample is small, results would indicate an interesting hypothesis for future research.

Palavras-chave : Bruna dels Pirineus; heat stress; horns; Pyrenean Brown; thermoregulation.

        · resumo em Português | Espanhol     · texto em Inglês     · Inglês ( pdf )