The effects of early-age thermal manipulation and daily short-term fasting on performance and body temperatures in broiler exposed to heat stress


Gunal M.

JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION, vol.97, no.5, pp.854-860, 2013 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 97 Issue: 5
  • Publication Date: 2013
  • Doi Number: 10.1111/j.1439-0396.2012.01330.x
  • Title of Journal : JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION
  • Page Numbers: pp.854-860

Abstract

This study was conducted to investigate the effects of thermal manipulation at 5days of age and short-term fasting during the warmest part of the day on responses to prolonged heat stress of broilers. A total of 240-day-old Ross 308 female broiler chicks were divided into three groups: control, thermal manipulation (chicks were exposed to 36 degrees C for 24h at 5days of age) and short-term fasting during the warmest part of the day (10.00-17.00h). Prolonged heat stress was induced daily from 28 to 42days by heating until the ambient temperature reached 32-35 degrees C between 10.00 and 17.00h. Both thermal manipulation and short-term fasting resulted in a decrease in rectal temperatures and haematocrit values at 35 and 41days of age. Thermal manipulation improved body weight, feed consumption and feed conversion. However, short-term fasting caused a reduction in body weight and a deterioration in feed conversion. Short-term fasting lowered the percentages of carcass, whereas thermal manipulation highered breast yield. Both thermal manipulation and short-term fasting decreased heart mass and abdominal fat.