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Effects of ▀-Mannanase in Corn-Soy Diets on Commercial Leghorns in Second Cycle Hens Full Article

ABSTRACT β- Mannanase (Hemicell ®) is a unique enzyme-based feed ingredient, which can hydrolyze β-mannan, an anti-nutritional fiber in feed. Because soybean meal contains β-mannan and its derivatives, addition of β-mannanase may improve soybean-meal utilization. The purpose of this study was to evaluate the effect of β-mannanase on performance of commercial Leghorns fed corn-soybean meal based diets. In this experiment, three diets were formulated. The metabolizable energy content for diet 1 (high-energy diet) was 2951 kcal/kg, which was 120 kcal/kg higher than diet 2 (low-energy diet supplemented with β-mannanase) and diet 3 (low-energy diet without β-mannanase). Hy-Line W-36 hens (n = 720, 98 wk old) were randomly divided into three dietary treatments (16 replicates of 15 hens per treatment). The trial lasted for 12 weeks. Overall average feed conversion of hens fed the low-energy diet supplemented with β-mannanase was similar to that of hens fed the high-energy diet, and both were significantly lower than that of hens fed the low-energy diet without β-mannanase . There were no significant differences in overall average egg production and egg mass among three dietary treatments for the 12-wk period. However, the addition of β-mannanase significantly increased average egg production and egg mass of hens fed the low-energy diet from week 5 to 8. There were n o significant differences in feed intake, egg specific gravity, egg weight, mortality, body weight, and body weight variability among three dietary treatments. β-mannanase supplementation improved energy utilization of corn-soybean layer diets, and has the potential to reduce the cost of practical laying hen diets containing β-mannan.

Key words: energy, β-mannanase, hens, energy utilization

Full Article 


Current Research

Influences of Dietary Energy on Performance and Egg Composition of Bovans White and Dekalb White in Phase I. (104Kb PDF file)

Effects of added Synthetic Lysine on Second Cycle Commercial Leghorns While Maintaining the Methionine+Cysteine/Lysine Ratio at 0.75 (107Kb PDF file)

Performance Comparison and Nutritional Requirements of Five Commercial Layer Strains in Phase IV (82Kb PDF file)

Influence of PhyzymeĎ on Commercial Leghorns Fed Corn-soy Diets (116Kb PDF file)

Effects of B-Mannanase in Corn-soy Diets on Commercial Leghorns in Second Cycle Hens (102Kb PDF file)


Archived Research

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