Impact of seasonal variation on endocrine profile during an estrous cycle in dairy cows


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Authors

  • Harish Kumar CSK Himachal Pradesh Agricultural University, Palampur – 176062, INDIA
  • Pravesh Kumar
  • Akshay Sharma CSK Himachal Pradesh Agricultural University, Palampur – 176062, INDIA
  • Dr. Rajesh Chahota CSK Himachal Pradesh Agricultural University, Palampur – 176062, INDIA
  • Pururava Sharma CSK Himachal Pradesh Agricultural University, Palampur – 176062, INDIA

Keywords:

Cortisol, Estradiol-17β, Progesterone, Temperature Humidity Index (THI)

Abstract

The objective of the study was to investigate the influence of season viz., summer, winter, and isothermic (spring and autumn season), on endocrine profile in dairy cows. The daily temperature-humidity index (THI) was recorded using a dry and wet-bulb thermometer to envisage its variation among different seasons. For analysis of endocrine profile, blood samples were collected from thirty dairy cows (n=10 in each season) at 5-day interval i.e. day 0 (day of estrus) to day 20, of the estrous cycle for ELISA based estimation of estradiol-17β, progesterone, and cortisol. In results, the THI varied significantly (p<0.01) in different seasons with maximum THI in the summer (72.54), followed by the isothermic (64.7) and lowest in the winter season (54.12). Among the endocrine profile, the plasma cortisol levels had a significant variation (p<0.05) in different seasons with increased levels in the winter followed by the summer season, however, differences were non-significant (p>0.05) in plasma progesterone and estradiol-17β. In summary, seasonal variation barely led to significant changes in the reproductive hormones (estrogen and progesterone) but alleviated cortisol levels during summer and winter season had been suggestive of stress and could result in reduced fertility.

Author Biographies

  • Harish Kumar, CSK Himachal Pradesh Agricultural University, Palampur – 176062, INDIA

    PG Scholar, Department of Veterinary Gynaecology and Obstetrics, Dr. GC Negi College of Veterinary and Animal Sciences

  • Akshay Sharma, CSK Himachal Pradesh Agricultural University, Palampur – 176062, INDIA

    Assistant Professor, Department of Veterinary Gynaecology and Obstetrics, Dr. GC Negi College of Veterinary and Animal Sciences

  • Dr. Rajesh Chahota, CSK Himachal Pradesh Agricultural University, Palampur – 176062, INDIA

    Professor & Head, Department of Veterinary Microbiology, Dr. GC Negi College of Veterinary and Animal Sciences

  • Pururava Sharma, CSK Himachal Pradesh Agricultural University, Palampur – 176062, INDIA

    PG Scholar, Department of Veterinary Gynaecology & Obst., DGCN COllege of Veterinary and Animal Sciences

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Submitted

2022-11-05

Published

2023-04-27

Issue

Section

ANIMAL PRODUCTION & REPRODUCTION

How to Cite

Impact of seasonal variation on endocrine profile during an estrous cycle in dairy cows. (2023). Indian Journal of Dairy Science, 76(2). https://epubs.icar.org.in/index.php/IJDS/article/view/129883