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Torki, M., Davoodi Far, M., Ghasemi, H. (2015). 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. Aquatic Physiology and Biotechnology, 4(1), 1-13.
M. Torki; M. Davoodi Far; H. A. Ghasemi. "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". Aquatic Physiology and Biotechnology, 4, 1, 2015, 1-13.
Torki, M., Davoodi Far, M., Ghasemi, H. (2015). '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', Aquatic Physiology and Biotechnology, 4(1), pp. 1-13.
Torki, M., Davoodi Far, M., Ghasemi, H. 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. Aquatic Physiology and Biotechnology, 2015; 4(1): 1-13.

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

تحقیقات تولیدات دامی
Article 1, Volume 4, Issue 1, March 2015, Pages 1-13    PDF (269.85 K)
Document Type: Research Paper
Authors
M. Torki1; M. Davoodi Far2; H. A. Ghasemi* 3
1Associate professor, Department of Animal Science, Agriculture Faculty, Razi University, Kermanshah, Iran
2MSc student, Department of Animal Science, Agriculture Faculty, Razi University, Kermanshah, Iran
3Assistant 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
Dietary energy; β-mannanase; Performance; Egg quality; Laying hens
References

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