Iranian Journal of animal Science

Iranian Journal of animal Science

Effects of summer and winter temperature–humidity index on performance of some reproductive traits of high producing dairy cows

Document Type : Research Paper

Authors
Hadi Dashti 1
Ahmad Riasi 2
Mohammad Ali Edris 3
Golam-Reza Gohrbani 3
Hossein Omidi-Mirzaei 4
1 M. Sc. Graduate, Department of Animal Science, Faculty of Agriculture, Isfahan University of Technology, Isfahan 84156–83111, Iran
2 Associate Professor, Department of Animal Science, Faculty of Agriculture, Isfahan University of Technology, Isfahan 84156–83111, Iran
3 Professor, Department of Animal Science, Faculty of Agriculture, Isfahan University of Technology, Isfahan 84156–83111, Iran
4 Ph.D. Student of Animal Science, College of Agriculture Lorestan University, Khorramabad, Iran
10.22059/ijas.2016.59037
Abstract
The aim of this study was to consider reproductive performance parameters and blood progesterone concentration changes in high-producing dairy cows (39±2 kg per day) after artificial insemination, in summer and winter. 270 heads of Holstein dairy cattle were choose in three big dairy farms, and blood samples were collected at days seven, ten and fourteen after artificial insemination. Temperature-humidity index was calculated according to one proposed formula (Dikmen and Hansen, 2009). The results showed that the maximum temperature–humidity index(THI) was 77.35 and 57.47 in summer and winter respectively. Pregnancy rates in cows inseminated during the winter months was significantly higher (p<0.01) than cows inseminated during the summer, and the effects of lactation on conception rate was significant in both seasons (p<0.01). Open days (101.18 vs. 165.07) and number of services per conception (2.05 vs. 3/48) in the winter were significantly lower than cows inseminated during the summer (p<0.01). In day 14 after insemination, blood serum progesterone concentration in cows inseminated in the winter was significantly higher (p<0.01) than summer. Results of this study showed that summer heat stress has significantly affects reproductive performance of dairy cows in central of Iran.
Keywords
Lactating dairy cow
progesterone
reproductive performance
Season
THI
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Iranian Journal of animal Science
Volume 47, Issue 2 - Serial Number 2
Autumn 2016
Pages 321-327

  • Receive Date 17 August 2015
  • Revise Date 13 April 2016
  • Accept Date 14 April 2016