Efectos de la tensión calórica en la época seca sobre algunos índices fisiológicos y el estado general en lactación y crecimiento en ganado lechero cruzado

Authors

  • Edil E. Arauz Universidad de Panamá.

DOI:

https://doi.org/10.15517/am.v3i0.25201

Abstract

The test was conducted, at the facilities of the Dual Purpose Dairy Program of the University of Panama in Chiriqui, Panama, to quantify the main climatic variables during the dry season and their effect on so me physiological indexes of lactating and growing hybrid dairy cattle. The physiological variables were analyzed using the split-plot experimental design in time and contrast of polynomial regression. Ten lactating hybrid cows, with and average weight of 446 kg and a milk production of 6.8 kg/cow/day, and ten calves weighing 118 kg each were used. The animals were Holstein/Brown Swiss X Zebu crossbreeds. The micro-climatic characterization, based on solar radiation, ambient temperature and the temperature-humidity index, indicated that the day time period during the dry season is the representative type of effective climatic heat stress,lactating cows and calves were affected by heat stress, and quadratic and cubic increases were observed in rectal temperature and the respiratory index over the normal physiological pattern.

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References

ANDERSON, B.E. 1984. Temperature regulation and environmental Physiology. In Dukes Physiology of Domestic Animals. Melvin J. Sweson ed. Comell Univ.Press. Ithaca. New York, USA. pp. 719-727.

BEEDE, D. K. et al. 1986. Potential Nutritional Strategies for intensively managed Cattle during thermal Stress. J. Animal Sci. 62: 543-554.

BlANCA, W. 1973. Termorregulación. In Adaptación de los Animales Domésticos. Hafez E.S, ed. Editorial Labor. pp.135-162.

BlANCA, et al., 1985. Efeccts of climatie and Management Factors on Conception Rate of Dairy Cattle in Subtropical Environment. J. Dairy Sci. 68: 78-85.

BULLOCK, J.; et al., 1984. Acid-Base Physiology. In: Physiology. John Willey & Sons. New York, USA. pp. 223-263.

COLLlER, R. J., et al. 1982. Influences of Environment and its modifications of Dairy Animal Health and Production. 1. Dairy Sci. 65:2213-2227.

COLLIER, R.J. et al. 1978. Patrones fisiológicos diarios en vacas bajo sombra. In: Duodécima Conferencia Anual sobre Ganadería y Avicultura en América Latina/IFAS. University of Florida, Gainesville Florida, U.SA. pp. E1-E7.

CURTIS, S.E. 1981. Control and Integration of termorregulatory. Processes. In: Enviromental Management in Animal Agriculture. Animal environment Services. Illinois, USA. pp. 6-1 a 6-12.

FOLK, G. E. 1973. Medición de las Respuestas Fisiológicas a estímulos ambientales. In: Adaptación de los animales Domésticos, E.SE Hafez (ed). Editorial Labor. pp. 457-476.

GILL, J.L. 1978. Split-Plot Designs. In: Design and Analysis of Experiments in the animal and Medical Sciences. Volume 2. The Iowa State Univesity Press/Ames, Iowa, USA. pp. 203-220.

HAFEZ, E. S. E. 1973. Efecto del medio ambiente sobre la producción de leche. In: Adaptación de los animales domésticos. Editorial Labor.

REECE, W. O. 1984. Respiration in mammals. In: Duckes Physiology of Domestic Animal by Melvin J. Swenson (ed). Cornell University Press. Ithaca, New York, U.S.A. pp. 226-254.

THOMPSON, G. E. 1985. Respiratory System. In: Principies of Stress Physiology. Yousef, n k. (ed). pp. 155-161.

YOUSEF, M. K. 1985. Thermoneutral zone. In: Principies of Stress Physiology, Volume 1. Academic Press. USA. pp. 9-14, 67-69.

Published

2016-06-22

How to Cite

Arauz, E. E. (2016). Efectos de la tensión calórica en la época seca sobre algunos índices fisiológicos y el estado general en lactación y crecimiento en ganado lechero cruzado. Agronomía Mesoamericana, 3, 34–39. https://doi.org/10.15517/am.v3i0.25201