Effects of long term feed restriction and dietary amino acids levelson growthperformance, lymphoid organs weight and white blood cell in Arian broilers chicken

Authors
kazem Yussefi Kelarikolaei
hamid reza aliakbarpour
Abstract
This study was conducted to determine the effects of feeding programs (ad lib and feed restriction (FR)) and dietary amino acids levels (DAAL) on performance, lymphoid organs (LO) and white blood cell (WBC) of Arian broilers. Study was completely randomized design oneight treatments (TR) with five replicates of 22 chicks of each. DAAL were calculated according to digestible lysine level. Experiment groups consisted of, 1) Control group (CT) that was feed ad lib with lysine recommended by Arian guideline, 2)FR was applied to CT, 3) ad lib with 7% lower lysine, 4) FR with 7% lower lysine, 5) ad lib with 7% higher lysine from 1 to 25 days of age (d) , 6) FR with 7% higher lysine from 1 to 25 d, 7) ad lib with 7% higher lysine from1 to 47 d, 8) FR with 7% higher lysine from1 to 47 d.Growth performance was evaluated at different ages and WBC, LO weight and carcass characteristics were examined at 47 d. Increasing DAAL significantlyincreased body and thymus weight (P

Keywords