Effects of heat waves on lactating Argentinian Holstein cows in the Dairy Module, Facultad de Ciencias Agrarias, UNR

  • Griselda Muñoz Universidad Nacional de Rosario. Facultad de Ciencias Agrarias
  • Flavia Rondelli UNR
  • Liliana Maiztegui Universidad Nacional de Rosario. Facultad de Ciencias Agrarias
  • Silvina María Gherardi UNR. Facultad de Cs. Veterinarias
  • Fernanda Tolini UNR. Facultad de Cs. Veterinarias
  • Javier Amelong UNR. Facultad de Cs. Agrarias
  • Gustavo Fernandez UNR. Facultad de Cs. Agrarias
  • Alejandra Coronel UNR. Facultad de Cs. Agrarias

DOI:

https://doi.org/10.19137/cienvet20141619

Keywords:

dairy cattle, heat stress, blood parameters, temperature-humidity index

Abstract

The objective of this work was to study blood parameters in dairy cattle during heat waves. The study was carried out during the 2011-2012 and 2012-2013 summer sea­sons in the Dairy Module at the College of Ag­ricultural Sciences, located in Zavalla (33°1´S, 60°53´O), in the south of the province of Santa Fe. Levels of creatinine, urea, total protein, se­rum albumin, as well as haematocrit, leukocyte count, and lymphocyte/neutrophil ratio were determined in blood samples collected from ten lactating second- and third- lactation cows during hot waves. The time of occurrence and length of heat waves were determined using the temperature-humidity index (THI), calculated with weather data from the Zavalla Agro mete­orology Station, which belongs to the National Weather Service network and to INTA (National Institute of Agricultural Technology). The mini­mum and maximum levels of creatinine (0.87 and 1.33 mg/100mL, respectively) remained within normal values compared to standard reference ranges. Slight increases in total pro­tein (6.07 to 9.16 g/100mL) and serum albumin (2.83 to 3.99 g/100mL) occurred when the ITH peaked at 76 during the January heat wave. Urea levels were consistently high in all mea­surements (17.41-70.95 mg/100mL). Leukocyte levels were always above normal ranges, with a marked decrease in the lymphocyte/neutrophil ratio (57 to 36) during the last heat wave of Ja­nuary. Haematocrit levels presented a decrease (32.09% to 29.92%) characteristic of chronic stress. Our results show that heat waves have a negative effect on the blood parameters of Argentinian Holstein cows in Zavalla

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Author Biographies

Griselda Muñoz, Universidad Nacional de Rosario. Facultad de Ciencias Agrarias

Profesora en Veterinaria y Magister en Educación Universitaria (FHyA-UNR)Profesora Adjunta a cargo de Anatomía y Fisiología Animal (Ingeniería Agronómica) y de Anatomía y Fisiología Comparada (Linc. Recursos Naturales).Docente de “El animal y el ambiente” (Esp. Sistema de Producción Animal Sustentable).Investigación, extensión y formación de recursos humanos en educación superior y sustentabilidad de los sistemas agropecuarios.

Flavia Rondelli, UNR

Facultad de Cs. Veterinarias. Prof. Adjunto Inmunología

Liliana Maiztegui, Universidad Nacional de Rosario. Facultad de Ciencias Agrarias

Universidad Nacional de Rosario. Facultad de Ciencias Agrarias

Published

2017-07-07

How to Cite

Muñoz, G., Rondelli, F., Maiztegui, L., Gherardi, S. M., Tolini, F., Amelong, J., … Coronel, A. (2017). Effects of heat waves on lactating Argentinian Holstein cows in the Dairy Module, Facultad de Ciencias Agrarias, UNR. Ciencia Veterinaria, 16(1), 113–127. https://doi.org/10.19137/cienvet20141619

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Section

Artículos de Investigación