Comportamento diurno de vacas Holandesas puras por cruza em ambiente quente
Keywords:
Estresse térmico. Etologia. Ócio. Ruminação. Sombra.Abstract
Objetivou-se avaliar o efeito do ambiente térmico sobre as respostas comportamentais de vacas Holandesas puras por cruza na região de Montes Claros, norte de Minas Gerais. Os tratamentos experimentais foram duas épocas do ano: A: julho/agosto e B: outubro/novembro de 2010, que em cada uma foram utilizadas 12 vacas Holandesas em lactação, puras por cruza, provenientes de cruzamentos absorventes. Os parâmetros comportamentais estudados foram às frequências das atividades de alimentação, ruminação, ócio, procura por sombra, além do local de preferência que as vacas permaneciam. Não houve efeito significativo (p>0,05) nas respostas comportamentais de alimentação, ruminação e ócio entre as duas fases estudadas e logo após cada ordenha a frequência de alimentação foi maior. Os animais elevaram as atividades de ruminação e ócio e tenderam a ficar em pé durante os horários mais quentes. Na fase B, em que ocorreu maior desconforto térmico, os animais permaneceram mais de 90% do tempo avaliado localizados a sombra. O ambiente térmico não alterou as respostas comportamentais referentes a ingestão de vacas Holandesas puras por cruza na região do norte de Minas Gerais. Embora, seja evidenciada a busca por sombra durante a fase de temperatura mais elevada, além da preferência das vacas pela sombra fornecida por árvores.Downloads
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References
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ALLEN, J. D. et al. Effect of core body temperature, time of day, and climate conditions on behavioral patterns of lactating dairy cows experiencing mild to moderate heat stress. Journal of Dairy Science, v. 98, p. 118-127, 2015.
ALTMANN, J. Observational study of behavior: Sampling methods. Behaviour, v. 48, p. 227-267, 1974.
ANDERSON, S. D. et al. Effects of adjustable and stationary fans with misters on core body temperature and resting behavior of lactating dairy cows in a semi-arid climate. Journal of Dairy Science, v. 96, p. 4738-4750, 2012.
ARMSTRONG, D. V. Heat stress interaction with shade and cooling. Journal of Dairy Science, v. 77, p. 2044-2050, 1994.
BERNABUCCI, U. et al. Metabolic and hormonal acclimation to heat stress in domesticated ruminants. Animal, v. 4, p. 1167–1183, 2010.
BERNABUCCI, U. et al. The effects of heat stress in Italian Holstein dairy cattle. Journal of Dairy Cattle, v. 97, p. 471-486, 2014.
BLACKSHAW, J. K.; BLACKSHAW, A. W. Heat stress in cattle and the effect of shade on production and behavioral: a review. Australia Journal of Experimental Agriculture, v. 34, p. 285 – 295, 1994.
BUFFINGTON, D. E.; COLLAZO-AROCHO, A.; CANTON, G. H. Black Globe-humidity index (BGHI) as comfort equation for dairy cows. Transactions of the ASAE, v. 24, p. 711-714, 1981.
HEDLUND, L.; ROLLS, J. Behavior of lactating dairy cows during total confinament. Journal of Dairy Science, v.60, p.1807-1812, 1977.
LEGRAND, A.; SCHÜTZ, K. E.; TUCKER, C. B. Using water to cool cattle: Behavioral and physiological changes associated with voluntary use of cow showers. Journal of Dairy Science, v. 94, p. 3376–3386, 2011.
LIMA, R. M. B. et al. Substituição do Milho por Palma Forrageira: Comportamento ingestivo de vacas mestiças em lactação. Acta Scientiarum, Maringá, v. 25, p. 347-353, 2003.
MATA E SILVA, B. C. et al. Características morfológicas do pelame de vacas Holandesas puras por cruza na região semiárida de Minas Gerais. Arquivo Brasileiro de Medicina Veterinária e Zootecnia, v. 65, p. 1767-1772, 2013.
NOGUEIRA, F. A. et al. Variação sazonal da contaminação por helmintos em matrizes ovinas e borregos submetidos a controle integrado e criados em pastagens tropicais. Ciência Rural, v. 39, p. 2544-2549, 2009.
OMINSKI, K. H. et al. Physiological and production responses to feeding schedule in lactating dairy cows exposed to short-term, moderate heat stress. Journal of Dairy Science, v. 85, p. 730–737, 2002.
PIRES, M. F. A.; VERNEQUE, R. S.; VILELA, D. Ambiente e comportamento animal na produção de leite. Informe Agropecuário, Belo Horizonte, v. 22, p. 11-21, 2001.
ROENFELDT, S. You can’t afford to ignore heat stress. Dairy Manage. v. 35, p. 6–12, 1998.
SCHÜTZ, K. E. et al. The amount of shade influences the behavior and physiology of dairy cattle. Journal of Dairy Science, v. 93, p. 125–133, 2010.
TUCKER, C. B.; ROGERS, A. R.; SCHÜTZ, K. E. Effect of solar radiation on dairy cattle behaviour, use of shade and body temperature in a pasture-based system. Applied Animal Behaviour Science, v. 109, p. 141–154, 2008.
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Published
2016-05-09
How to Cite
Mata e Silva, B. C. da, Pires, M. de F. Ávila, Marques, L. C. G., Porto, B. R., & Carvalho Junior, I. S. de. (2016). Comportamento diurno de vacas Holandesas puras por cruza em ambiente quente. Agrarian Sciences Journal, 8(1), 49–56. Retrieved from https://periodicos.ufmg.br/index.php/ccaufmg/article/view/2887
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