Mojtaba Zaghari

Introduction In the past decades, the improvement of production efficiency has resulted in the tremendous success in the poultry industry. Feed Conversion Ratio has decreased from 2.8 in the 1950s to less than 1.6 currently. Over the past 25 years, the number of eggs laid by a single laying hen increased by at least one egg per year. As the production efficiency has improved, the poultry industry ...

INTRODUCTION Temperature is the most important environmental factor in animal production and directly affects animal responses. Domestic birds are homeotherm animals and therefore must expend energy to maintain body temperature, in order to have adequate biochemical, physiological and behavioral responses (Al-Saffar, 2002). At high temperatures, the feather coverage is one of the factors that impa ...