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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.20.0016    [Accepted] Published online May 12, 2020.
Graded concentrations of digestible lysine on performance of white leghorn laying hens fed sub-optimal levels of protein
Savaram Venkata Rama Rao1,*  , Shyam Sundar Paul1  , Mantina Venkata Lakshmi Narasimha Raju1  , Devanaboyina Nagalakshmi2  , Bhukya Prakash1 
1Poultry Nutrition Section, ICAR-Directorate of Poultry Research, Hyderabad, India
2College of Veterinary Science, PVNR Telangana Veterinary University, Hyderabad 500030, India
Correspondence:  Savaram Venkata Rama Rao, Tel: +91-4024015651, Fax: +91-4024027002, Email: svramarao1@gmail.com
Received: 10 January 2020   • Revised: 15 February 2020   • Accepted: 10 April 2020
An experiment was conducted to study the effect of graded concentration of digestible lysine (dLys) on performance of layers fed diets containing sub-optimal level of protein.
Five diets were formulated to contain graded concentrations of dLys (0.700, 0.665, 0.630, 0.593 and 0.563%), but similar levels of crude protein (15% CP), energy (10.25 MJ ME/kg) and other nutrients. A total of 3520 hens (26 wk of age) with mean body weight of 1215+12.65g were randomly divided into 40 replicate groups of 88 birds in each and housed in open sided colony cage house. Each diet was offered ad libitum to eight replicates from 27 to 74 wk of age. The performance was compiled at every 28 d and the data for each parameter were grouped into three phases, that is early laying phase (27 to 38wk), mid laying phase (39 to 58 wk) and late laying phase (59 to 74 wk of age) for statistical analysis.
Egg production (EP), egg mass (EM) and feed efficiency (FE– feed required to produce an egg) were significantly improved by the dLys level during the early and mid laying phases but not during the late phase. Whereas, feed intake (FI) was significantly reduced by dLys concentration during mid and late laying phases but not during early laying phase. The egg weight (EW) was not affected by dLys concentration in any of the three phases.
Based on best fitted statistical models, dietary requirements of dLys worked out to be 0.685%, 0.640% and 0.586% during early phase, mid phase and late egg laying phase, respectively. The calculated requirement of dLys for the respective production phases are 727 mg/bird/d during the early and mid laying phases and 684 mg/bird/d during the late laying phase in diets containing 15% CP.
Keywords: Egg mass; Egg production; Egg weight Feed efficiency; Layer; Lysine

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