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Effect of supplementing graded concentrations of non-phytate phosphorus on performance, egg quality and bone mineral variables in White Leghorn layers

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Title Effect of supplementing graded concentrations of non-phytate phosphorus on performance, egg quality and bone mineral variables in White Leghorn layers
Non phytate phosphorus for layers
 
Creator S. V. Rama Rao,
M. V. L. N. Raju,
S. S. Paul
B. Prakash
 
Subject Egg production; layers; non-phytate phosphorus; shell quality
 
Description Useful for layer farmers and researchers
1. An experiment was conducted to determine optimal non-phytate phosphorus (NPP) concentrations
for White Leghorn (WL) layers (22–72 weeks) fed diet containing 38 g Ca/kg.
2. Eight diets with graded concentrations (1.5–3.25 g/kg in increments of 0.25 g) of NPP were
prepared. Each diet was fed to eight pen replicates containing 88 birds in each. Performance data
was evaluated in three different phases (phase I-22–37 weeks, phase II-38–53 weeks and phase III-
54–72 weeks). Optimum levels of NPP were determined by fitting a quadratic polynomial (QP)
regression model.
3. Egg production (EP) was not affected (P = 0.059) by the concentration of NPP and interaction
between NPP and diet phase was non-significant, indicating that the lowest concentration (1.5 g/kg
diet) of NPP used in the study was adequate across the three phases. However, EP was influenced
by phase (P < 0.001).
4. Optimum concentration of NPP for feed intake (FI) was estimated to be 1.5, 1.71 and 2.40 g/kg
diet during phases I, II and III, respectively. FI per egg mass (EM) or feed efficiency (FE) responded
quadratically with NPP and also differed significantly between phases. Optimum concentration of
NPP for FE during phases I, II and III was 1.5, 2.56 and 2.32 g/kg diet, respectively.
5. Egg weight (EW), EM, shell weight and thickness were not affected by NPP concentration
although all of these variables (except shell weight) were influenced by phases.
6. Breaking strength of tibia and Ca contents in tibia ash were not affected by the concentration of
NPP, but bone ash and P contents in tibia ash were influenced (P < 0.001) by NPP. Predicted optimal
concentrations of NPP for responses for tibia ash at 44 or 72 weeks, tibia ash P at 44 weeks and tibia
ash P at 72 weeks were 1.55, 2.63 and 1.5 g/kg diet, respectively.
7. Based on the results, it was concluded that WL layers required 1.5 g, 2.63 g and 2.4 g,
respectively/kg diet during phase I, II and III with the calculated daily intake of 137.3, 278.3 and
262 mg NPP/b/d.
Not Available
 
Date 2019-12-03T07:48:19Z
2019-12-03T07:48:19Z
2019-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/26552
 
Language English
 
Relation Not Available;
 
Publisher Taylor & Francis