المجلة الجزائرية للعلوم
Volume 1, Numéro 2, Pages 5-10
2018-06-03

Effect Of Very High Rearing Temperature On Changes In Hormones Re-sponsible Physiological Stress In Broilers Reared In Western Algerian



Authors : Attou Sahnouna . Aissaoui Chadli . Nemmiche Said . Homrani Abdelkader .

Abstract

This study was conducted to evaluate the effects of a very hot temperature on broil-ers. Faced with this severe heat, we wanted to determine the limits variations in growth performance in broilers. Above all, it was of interest to determine whether or not the hormones triiodothyronine (T3), thyroxine (T4), aldosterone (Ald) and ACTH would also be affected by changes resulting from very hot. Two hundred male chicks (Hubbard) of a day were reared during 50 days. They were divided into two groups. Two thermal environments were applied from the 7th day of rearing: Thermoneutral (NT: 25 °C) for the first group and a very hot temperature (HT: 37°C) for the second. Every day, broiler chickens received ad libitum feeds and water drink. DRG® ELISA (Enzyme linked Immuno Sorbent Assay) kits were used for the deter-mination of T3, T4, Ald and ACTH (EIA-3801, 4568, 4128 and 3647 respectively). Decrease in the feed intake (FI) due to HT was observed. Superiority of body weight (BW) in NT broilers was recorded. A significantly higher deposit of subcutaneous lipids (SCL) up to 105g/Animal was btained in HT broilers. Weight of abdominal fat (AF) was higher in NT broilers. From day 18, T3 decreases were recorded in HT broilers. At the end of the breeding, the level of T3 in HT broilers was identical to that of NT broilers. The HT broilers had recorded higher levels of Ald. From the 40th day, significant increases in ACTH levels were recorded in HT broilers.

Keywords

Algeria, Climate, Hormonology, Poultry, Resistance, Scorching heat

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