Effect of L-Threonine Supplementation to Diet on Some Productive and Physiological of Traits Broiler Chickens Under Heat Stress Conditions

Abstract

This experiment was conducted in Erbil, Iraq, from July 7 to August 17, 2021, for determine the effects of L-Threonine supplementation on several productive and physiological traits Under heat stress conditions (36.04 ± 2 °C), A total of 200 broiler chicks were randomly distributed into five treatments: T1 control treatment, T2, T3, T4 and T5 standard diet with L-Threonine 250, 500, 750 and 1000 mg/kg, respectively. The results showed that the addition of L-Threonine to the ration improved broiler production performance under heat stress conditions such as body weight it increased significantly (P≤0.05) in T3 and T5 and reached 2187 and 2235 g, respectively compared to 2145 g in the T1 and reduce H/L ratio in T4 and T5 compared with T1 and did not affect effect (P≥0.05) on physiological traits such as red and white blood cell count, hematocrit, cholesterol, glucose, total protein, aspartate aminotransferase and alanine aminotransferase activities

Efficacy of peppermint (Mentha pipreitae), basil (Ocimum basilicum) and their combination on growth performance and meat quality of broilers

“…Weight gain (g) = BW at the end of the experiment -BW at the beginning of the experiment Feed conversion ratio (FCR) = Final Feed intake / Final weight gain Calculated using the following equation according to (Wasman, 2022).…”