Effects of Heat Stress on Some Physiological Indicators to the Broilers Cobb

Authors

  • Daniel Cucă Spiru Haret University, Faculty of Veterinary Medicine, 30352 Bucharest, 256 Basarabia Ave., Romania
  • Cristina Dinu Spiru Haret University, Faculty of Veterinary Medicine, 30352 Bucharest, 256 Basarabia Ave., Romania

Keywords:

Cobb broilers, haematocrit, haemoglobin, heat stress

Abstract

Four groups of Cobb broilers aged 14 days and average body weight of 480 g, grown in terms of age-appropriate diets were exposed to elevated ambient temperatures 38º-40ºC, varying by experimental scheme for a period of three weeks. Weekly body weight, rectal temperature, haematocrit and haemoglobin were determined and the results compared with those obtained in the control group. Body weight recorded significant drops of 7% in group 3 starting from the first experimental week. Rectal temperature increased on average by 5.5% for groups 2 and 3 and for group 4 the increase was insignificant. In the dynamics of haematocrit there was a significant decrease of 7.2% in lot 3 in the first experimental week. Haemoglobin recorded in group 2, a significant decrease in the first two weeks averaged 5.8%, and 6.8% in group 3. It was found that the adaptation to the high temperature of the environment was achieved by the reduction of energy metabolism following low food ingestion and biochemical changes at the cellular level.

References

Nardone, A., Ronchi B., Lacetera, N., Ranieri, M.S., Bernabucci, U., Effects of climate changes on animal production and sustainability of livestock systems. Livestock Science, 2010, 130, 5769.

Lara, J. Lucas, J., Marcos, H. Rostagno, Impact of Heat Stress on Poultry Production, Animals (Basel), 2013, 3(2), 356–369.

Cahaner, A., Nader, D., Gutman, M., Effects of plumage reducing naked neck gene on the performance of fast growing broilers at normal and high ambient temperatures. Poultry Science, 1993, 72, 767-775.

Cooper, M. A., Washburn, K. W., The relationships of body temperature to weight gain, feed consumption and feed utilisation in broilers under heat stress. Poultry Science, 1998, 77, 237-242.

Eberhart, D. E., Washburn, K. W., Varation in body temperature response of naked neck and normally feathered chickens to heat stress. Poultry Science, 1993, 72, 1385-1390.

Renaudeau, D., Collin, A., Yahav, S., de Basilio, V., Gourdine, J. L., Collier R. J., Adaptation to hot climate and strategies to alleviate heat stress in livestock production, Animal, 2012, 6, 707-728.

Etches, R. J., John, T. M, Verrinder Gibbins A. M. V., Behavioural, physiological, neuroendocrine and molecular responses to heat stress. Poultry production in hot climates, edited by N. J. Daghir, 2end ed.- 2008, pp 48-80, books.google.com.

Yahay, S., Hurwtt, S., Induction of thermotolerance in male broiler chickens by temperature conditioning at an early age. Poultry Science, 1996, 75, 402-406.

Soleimani, A. F., Zulkifli, I., Omar, A. R., Raha, A. R., Physiological responses of 3 chicken breeds to acute heat stress. Poultry Science 2011, 90, 1435–1440.

Quinteiro-Filho, W. M., Ribeiro, A., Ferraz-de-Paula, V., Pinheiro, M. L., Sakai, M., As, L. R., Ferreira, A. J., Palermo-Neto, J., Heat stress impairs performance parameters, induces intestinal injury, and decreases macrophage activity in broiler chickens, Poultry Science, 2010, 89, 1905–1914.

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Published

2023-09-12