EFFECT OF ENZYME SUPPLEMENTATION IN LAYER DIETS ON EGG PRODUCTION PERFORMANCE OF TWO STRAINS OF WHITE LEGHORN CHICKEN
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Date
2011
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AAU, Anand
Abstract
Experimental population included "FWN" and "IWP" strains of White Leghorn type laying hens of seventh generation. 360 pedigreed females of IWN strain and 360 pedigreed females of IWP strain were used for the experiment. Various traits required for present study were measured at different periods of age. As dietary energy level was increased, body weight (BW) was increased significantly (P < 0.05) at 40, 64 and 72 weeks of age. Energy levels (2400, 2550 and 2700 kcal ME) did not affect total egg number produced per bird (TEN) significantly. As dietary energy level was increased, total feed consumption per bird (TFC) and feed consumed per egg produced (FCE) was decreased significantly (P< 0.05) at 40, 64 and 72 weeks of age. Values of feed cost per egg produced (ECOST) differed significantly (P< 0.05) at 2400, 2550 and 2700 kcal ME levels. Different energy levels did not affect egg weight [EW] at 40 [EW40] and 64 [EW64] weeks of age significantly. EW72 at 2400 kcal ME level differed significantly (P< 0.05) from EW72 at 2550 and 2700 kcal ME levels. Enzyme supplementation in layer diet lowered the BW in enzyme group than control group which was non significant. TEN was increased Avlth enzyme supplementation in layer diet but it was non significant. Enzyme supplementation had significantly (P< 0.05) reduced TFC64, TFC72, FCE64 and ECOST64. There was non significant reduction in EW in enzyme group. Effects of energy levels and enzyme supplementation were found non significant for BW. Effects of same were found significant (P< 0.05) for TEN64 and TEN72 at 2550 kcal ME level, whereas effects of same were found non significant for TEN40. Effects of energy levels and enzyme supplementation were found significant (P< 0.05) for TFC40 at 2400 and 2550 kcal ME levels but it was non significant for TFC64 and TFC72. At 2400, 2550 and 2700 kcal ME levels; TFC64 and TFC72 were lower in enzyme group than control group. Effects of same were found significant (P< 0.05) for FCE64, ECOST64 and ECOST72 at 2550 kcal ME level. Effects of same were found non significant for EW. Effects of strain of layer birds and energy levels were found non significant for BW, TEN, TFC, FCE, ECOST and EW. Effects of strain of layer birds and enzyme supplementation were found non significant for BW, TEN, TFC and EW. Effects of same were found significant (P< 0.05) for FCE64 and ECOST64 in IWP strain, whereas effects were non significant in IWN strain. Effects of strain of layer birds, energy levels and enzyme supplementation were found non significant for BW, TEN, TFC, FCE, ECOST and EW. Birds fed 2400 kcal ME/kg diet along with enzyme supplementation gave higher values of retention coefficient for dry matter, crude protein, organic matter and calcium in comparison to the same diet when fed without enzyme supplementation. Results observed from present study are in favour of enzyme supplementation in layer diet for better production performance in IWN and IWP strains. Results obtained also indicate that economical rearing of layer birds can be done with low energy (2400 kcal ME/kg) layer diets without significantly affecting production performance of IWN and IWP strains as compared with 2550 and 2700 kcal ME/kg layer diets. Enzyme supplementation can also be useful for better nutrient utilization by layer birds of IWN find IWP strains with low energy (2400 kcal ME/kg) layer diets.
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Poultry Science, A Study