Effects of different levels of metabolizable energy and β-mannanase on egg quality and performance of laying hens fed diet based on corn-barley-soybean meal

Document Type : Research Paper

Authors

1 Associate professor, Department of Animal Science, Agriculture Faculty, Razi University, Kermanshah, Iran

2 MSc student, Department of Animal Science, Agriculture Faculty, Razi University, Kermanshah, Iran

3 Assistant professor, Department of Animal Science, Faculty of Agriculture and Natural Resources, Arak University, Arak, Iran

Abstract

A total of 216 white Hy-Line laying hens (57 wk of age) were used for 8-wk period to investigate the effect of different levels of energy and enzyme β-mannanase in the corn-barely-soybean based diet on performance and egg quality parameters. This experiment was conducted in a completely randomized design as factorial experiment (2 × 2) with 9 replicates. Treatments consisted of two levels of energy (2850 and 2750 Kcal/kg diet) and 2 levels of enzyme β-mannanase (with or without enzyme). The results showed that the the use of high-energy diets (2850 kcal/kg) in comparison with low-energy diets (2750 kcal kg) reduced feed intake (95.6±3.9 vs 97.9±2.0 g; P=0.038) and increased yolk color index (5.7±0.6 vs 5.1±0.7; P=0.044). However, other production traits and egg qualitaty parameters were not affected by dietary energy level. Although the effect of β-mannanase enzyme on production parameters and egg quality traits were not significant, there were the trends for decreasing the percentage of broken eggs (P=0.072) and improving eggshell thickness (P=0.086) with supplementing β-mannanase to the diet. Significant interactions between energy and enzyme were also observed in term of shell thickness during the whole experimental period, so that low-energy diet with enzyme significantly improved the eggshell thickness compared with low-energy diet without enzyme (P=0.049). According to the results of current study, the use of β-mannanase enzyme is recommended to improve the eggshell quality characteristics in low-energy diet based on corn-barely-soybean diet.

Keywords

References

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