Graded concentrations of digestible lysine on performance of White Leghorn laying hens fed sub-optimal levels of protein
| Autor: | Nagalakshmi Devanaboyina, Venkata Rama Rao Savaram, S.S. Paul, Prakash Bhukya, Venkata Lakshmi Narasimha Raju Mantina |
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| Rok vydání: | 2021 |
| Předmět: |
Physiology
Lysine Biology 01 natural sciences Feed conversion ratio Laying Nutrient Animal science Late phase egg weight feed efficiency Genetics Statistical analysis egg mass lysine General Veterinary layer 010401 analytical chemistry 0402 animal and dairy science egg production 04 agricultural and veterinary sciences 040201 dairy & animal science 0104 chemical sciences Dietary Requirements QL1-991 Animal Science and Zoology Early phase Zoology Food Science |
| Zdroj: | Animal Bioscience, Vol 34, Iss 5, Pp 886-894 (2021) |
| ISSN: | 2765-0235 2765-0189 |
| DOI: | 10.5713/ajas.20.0016 |
| Popis: | 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 3,520 hens (26 wk of age) with mean body weight of 1,215+12.65 g were randomly divided into 40 replicate groups of 88 birds in each and housed in an 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 38 wk), mid laying phase (39 to 58 wk), and late laying phase (59 to 74 wk of age) for statistical analysis.Results: Egg production, egg mass and feed efficiency (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 was significantly reduced by dLys concentration during mid and late laying phases but not during early laying phase. The egg weight 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/b/d during the early and mid laying phases and 684 mg/b/d during the late laying phase in diets containing 15% CP. |
| Databáze: | OpenAIRE |
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