Effects of vitamin E and vitamin C dietary sup- plementation on egg production and egg quality of laying hens exposed to a chronic heat stress
نویسندگان
چکیده
Heat stress in laying hens is prompted by combinations of environmental temperature and humidity that prevent the bird’s thermoregulatory process from effectively dissipating the heat produced during metabolism [32]. High environmental temperature is the major problem faced by laying hens as well as poultry farmers usually in summer months. The ideal temperature for laying hens is about 20°C [21]. Heat stress begins when the ambient temperature climbs above 25°C and is readily apparent above 30°C. Heat stress in laying hens reduces live weight gain, feed intake, feed efficiency, production and quality of eggs and increases mortality [4, 7].
منابع مشابه
Effects of Dietary Supplemental Vitamin E and Chromium on Egg Production, Egg Quality and Blood Parameters of Laying Hens under Thermoneutral or Heat Stressed Conditions
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