Volume 14, Issue 4 (12-2023)
Res Anim Prod 2023, 14(4): 11-19 |
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Zamani R, Jonmohammadi H, Mirgheleng S A, Didehban Y. (2023). Determination of Metabolizable Energy Value in Canola Meal with and without Enzymes Addition by Regression Method in Adult Leghorn Roosters. Res Anim Prod. 14(4), 11-19. doi:10.61186/rap.14.42.11
URL: http://rap.sanru.ac.ir/article-1-1357-en.html
URL: http://rap.sanru.ac.ir/article-1-1357-en.html
1- Department of Animal Science, Tabriz University, Tabriz, Iran
2- Department of Animal Science, Faculty of Agriculture, Urmia University, Urmia, Iran
3- Department of Animal Science, Faculty of Agriculture, Tabriz University, Tabriz, Iran
2- Department of Animal Science, Faculty of Agriculture, Urmia University, Urmia, Iran
3- Department of Animal Science, Faculty of Agriculture, Tabriz University, Tabriz, Iran
Abstract: (1297 Views)
Extended Abstract
Background: In addition to its high protein content, canola meal can significantly contribute to the energy supply in poultry feeds due to its relatively high levels of carbohydrates and crude fat. The value of apparent metabolizable energy (AMEn) for canola meal in the NRC table is 2000 kcal/kg. However, the metabolizable energy value of canola meal has not been published in the Iranian tables of feed composition by the Animal Science Research Center. The evaluation of feed is completed by determining its nutrient composition, followed by measuring its metabolizable energy content. Various methods exist to determine the amounts of metabolizable energy in poultry feeds, each with its own advantages and disadvantages. The regression method is one such approach that allows for the study of the metabolizable energy content of a test ingredient in practical diets at different levels. The purpose of this experiment was to determine the apparent metabolizable energy values corrected to zero point of nitrogen balance (AMEn) of canola meal, both with and without enzymes, using the regression method in adult Leghorn roosters.
Methods: Canola meal samples were obtained from poultry feed plants in Tabriz, and their chemical composition was measured according to standard methods. A total of 48 adult Leghorn roosters were used, with 6 replications in a completely randomized design in a factorial arrangement (2 × 4) (two enzyme levels: zero and 375 units × four levels of canola meal: zero, 7, 14, and 21 percent), employing the regression method by replacing corn-soybean meal in the diet with canola meal.
Results: The average values for dry matter, ash, crude protein, ether extract, neutral detergent fiber (NDF), and acid detergent fiber (ADF) were 88.5%, 6.8%, 34.4%, 6.7%, 34.5%, and 20.5%, respectively. The gross energy value of canola meal was 4324 kcal/kg. As the level of canola meal in the experimental diets increased, the values of apparent dry matter metabolizable energy (ADMM), apparent organic matter metabolizable energy (AOMM), AMEn, and gross energy efficiency decreased significantly (p < 0.05). The AMEn decreased by 7.4%, equivalent to 244 kcal/kg, in the diet containing 21% canola meal compared to the control diet without canola meal. The addition of enzymes improved the AMEn of diets containing canola meal by 64 kcal/kg. The equations for estimating AMEn of canola meal with and without enzymes demonstrated high determination coefficients of 0.83 and 0.79, respectively. The AMEn of canola meal with and without enzymes, as estimated by the regression method, was 1985 and 1838 kcal/kg, respectively.
Conclusion: The obtained AMEn values for canola meal with and without enzymes, determined by the regression method, were lower than the corresponding values reported in NRC (1994). Therefore, formulating poultry diets using the AMEn values reported here may be effective in predicting the birds’ performance.
Methods: Canola meal samples were obtained from poultry feed plants in Tabriz, and their chemical composition was measured according to standard methods. A total of 48 adult Leghorn roosters were used, with 6 replications in a completely randomized design in a factorial arrangement (2 × 4) (two enzyme levels: zero and 375 units × four levels of canola meal: zero, 7, 14, and 21 percent), employing the regression method by replacing corn-soybean meal in the diet with canola meal.
Results: The average values for dry matter, ash, crude protein, ether extract, neutral detergent fiber (NDF), and acid detergent fiber (ADF) were 88.5%, 6.8%, 34.4%, 6.7%, 34.5%, and 20.5%, respectively. The gross energy value of canola meal was 4324 kcal/kg. As the level of canola meal in the experimental diets increased, the values of apparent dry matter metabolizable energy (ADMM), apparent organic matter metabolizable energy (AOMM), AMEn, and gross energy efficiency decreased significantly (p < 0.05). The AMEn decreased by 7.4%, equivalent to 244 kcal/kg, in the diet containing 21% canola meal compared to the control diet without canola meal. The addition of enzymes improved the AMEn of diets containing canola meal by 64 kcal/kg. The equations for estimating AMEn of canola meal with and without enzymes demonstrated high determination coefficients of 0.83 and 0.79, respectively. The AMEn of canola meal with and without enzymes, as estimated by the regression method, was 1985 and 1838 kcal/kg, respectively.
Conclusion: The obtained AMEn values for canola meal with and without enzymes, determined by the regression method, were lower than the corresponding values reported in NRC (1994). Therefore, formulating poultry diets using the AMEn values reported here may be effective in predicting the birds’ performance.
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