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Iranian Journal of Veterinary Clinical Sciences
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

akbari-m@agr.sku.ac.ir    unknown
swich_h@yahoo.com    unknown
mandanahoseini72@gmail.com    unknown

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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, ۲۸۰ mail one-day-old broiler chicks (Ross ۳۰۸) were used in a completely randomized design with seven treatments of four replicates each. Treatments were a WBD supplemented with seven levels of threonine (۹۰, ۱۰۰, ۱۱۰, ۱۲۰, ۱۳۰, ۱۴۰, and ۱۵۰% of NRC (۱۹۹۴) recommendation. During ۱-۲۱ 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) (۱۰۰ µg) was injected into toe web. Increasing the threonine level to more than ۱۳۰% of NRC (۱۹۹۴) recommendations, decreased BWG (P<۰.۰۵) during ۱۵ to ۲۱ d of age. Adjusting threonine level at ۱۱۰% NRC (۱۹۹۴) recommendations comparing to ۹۰%, improved FCR during ۱۵ to ۲۱ and ۱ to ۲۱ d of age (P<۰.۰۵). Supplementation of the WBD with threonine at the levels of ۱۱۰, ۱۲۰, and ۱۳۰% of NRC (۱۹۹۴) recommendation, significantly increased antibody titre against SRBC (P<۰.۰۵). Higher dietary threonine levels (۱۱۰% and ۱۳۰% of NRC (۱۹۹۴) recommendations), increased CBH response after PHA injection (P<۰.۰۵). Overall, it seems that the requirements of threonine in WBD for optimum performance and immune system enhancement, is more than the NRC (۱۹۹۴) recommendations.




Keywords

wheat  threonine  performance  immune response  broiler chickens 



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Journal of Materials Science: Materials in Electronics
Impact Factor
0/000
Available
2000 - 2020
Volumes
15
Issues
25
Articles
301
Open Access Articles
211