Milk yield in Holstein cows and physiological responses in hot environment

  • Josiel Borges Ferreira Universidade Federal Rural do Semi-Árido
  • Débora Andréa Evangelista Façanha Universidade Federal Rural do Semi-Árido
  • Jacinara Hody Gurgel Morais Leite Universidade Federal Rural do Semi-Árido
  • Magda Maria Guilhermino Universidade Federal do Rio Grande do Norte
  • Ângela Maria de Vasconcelos Universidade Estadual Vale do Acaraú
  • Wirton Peixoto Costa Universidade Federal Rural do Semi-Árido

Resumo

This study is aimed to evaluate the physiological responses and the production of milk cows of the Holstein breed, pure, in the dry and rainy seasons. During the period from March to October rectal temperature (TR), respiratory rate (FR) and milk production (PL) were taken at 7 am and at 3 pm twice a week, in eleven cows. At the same time, in these cows there were also recorded temperatures of air and black globe, humidity and it was calculated the Globe and Humidity Temperature Index (ITGU). Statistical analyzes were performed by the method of least squares and this revealed significant effects of the animal, also the year of the period and month collection period within the year on the variables recorded, with higher TR and FR during the rainy season, when the PL was higher. There was a significant time interaction and animals just for the PL and the interaction time of collection and time for PL and TR. The effects of ITGU in the shade and the sun were different only concerning the FR. Milk production was extremely low in all periods of the year and in the dry season, in the afternoon, there was a higher body heat, and in the rainy season the use of the mechanisms of respiratory evaporative heat loss was intensified.

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Biografia do Autor

Josiel Borges Ferreira, Universidade Federal Rural do Semi-Árido
Pós-Graduação em Ciência Animal Departamento de Ciências Animais
Débora Andréa Evangelista Façanha, Universidade Federal Rural do Semi-Árido
Departamentos de Ciências Animais
Jacinara Hody Gurgel Morais Leite, Universidade Federal Rural do Semi-Árido
Departamento de Ciências Animais Pós-Graduação em Ciência Animal
Magda Maria Guilhermino, Universidade Federal do Rio Grande do Norte
Unidade Acadêmica Especializada em Ciências Agrárias Docente do Curso de Zootecnia
Wirton Peixoto Costa, Universidade Federal Rural do Semi-Árido
Departamento de Ciências Animais
Publicado
2016-08-01
Seção
Original Articles / Artigos de Pesquisa