Furthermore, increased abdominal fat and decreased carcass protein have been noticed in heat stressed broiler due to the hot environment (MOHAMED et al., 2019). Nutritional and management therapies can be introduced to minimize the heat stress due to high environmental temperaturetemperatures in broiler production.
Dietary supplementation of certain essential amino acids can enhance production by diminishing the problems resulting from heat stress. Methionine and threonine are generally considered first and third limiting amino acids in corn-soybean-based broiler diet (OJANO-DIRAIN and WALDROUP, 2002; LI et al., 2000). Methionine is a vital amino acid for protein synthesis, whereas threonine is used for protein deposition, and plays several other significant metabolic roles, and isas well as being involved in nutrient absorption through the intestinal wall (AHMED and ABBAS, 2011; KHEIRI and ALIBEYGHI, 2017). Thus, adequate dietary levels of these amino acids are essential for optimum growth, carcass traits, and immunity development of commercial broilers (MAROUFYAN et al., 2010; OJANO-DIRAIN and WALDROUP, 2002). The National Research Council (NRC) recommended increased amino acid levels in rationrations during hot and high ambient temperatures to compensate for the reduced feed intake of broiler (AHMED and ABBAS, 2011) and to minimize the different types of stresses exposed in broiler farmfarms (MAROUFYAN et al., 2010). Since, since little information is available on the amino acid needs of broiler raised in hot and humid environmental conditions. In previousPrevious studies have shown that high environmental temperatures influence the amino acid requirements of broilers, either as a function of reduced amino acid digestibility (MAHARJAN et al., 2020; HABASHY et al., 2017; HAI et al., 2000) or as a result of decreased feed intake (REHMAN et al., 2018). However, information on the response of commercial broilers by supplying limiting amino acids during high environmental temperatures is still scarce.