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Graded concentrations of digestible lysine on performance of white leghorn laying hens fed sub-optimal levels of protein.

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Title Graded concentrations of digestible lysine on performance of white leghorn laying hens fed sub-optimal levels of protein.
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Creator SV Rama Rao,S.S. Paul, MVLN Raju and B Prakash
 
Subject Egg mass; Egg production; Egg weight Feed efficiency; Layer; Lysine
 
Description Not Available
Objective
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.
Methods
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.
Results
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.
Conclusion
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.
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Date 2020-08-11T10:50:33Z
2020-08-11T10:50:33Z
1001-01-01
 
Type Research Paper
 
Identifier SV Rama Rao, S.S. Paul, MVLN Raju and B Prakash .2020. Graded concentrations of digestible lysine on performance of white leghorn laying hens fed sub-optimal levels of protein. Asian Australasian Journal of Animal Sciences. DOI: 10.5713/ajas.20.0016
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http://krishi.icar.gov.in/jspui/handle/123456789/39454
 
Language English
 
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Publisher Not Available