Effect of supplementary threonine in starter wheat-based diets on growth performance, immune system and intestinal organ parameters of broiler chickens

Authors
Mohammad Reza Akbari
Shahin Haghighi
Seyede Mandana Hoseini
Abstract
In order to evaluate effects of supplementation of a low-protein wheat-based diet (WBD) with different levels of threonine on performance and immune function, ??? mail one-day-old broiler chicks (Ross ???) were used in a completely randomized design with seven treatments of four replicates each. Treatments were a WBD supplemented with seven levels of threonine (??, ???, ???, ???, ???, ???, and ???% of NRC (????) recommendation. During ?-?? d of age, feed intake (FI), body weight gain (BWG) and feed conversion ratio (FCR) were recorded weekly. For humoral immune system evaluation, sheep red blood cells (SRBC) was injected; and in order to evaluate cutaneous basophil hypersensitivity (CBH) response, Phytohemagglutinin (PHA) (??? µg) was injected into toe web. Increasing the threonine level to more than ???% of NRC (????) recommendations, decreased BWG (P

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