Abstract
This research aimed at generating and evaluating prediction equations to estimate metabolizable energy values in poultry offal meal. The used information refers to values of apparent and true metabolizable energy corrected for nitrogen balance (AMEn and TMEn) and for chemical composition of poultry offal meal. The literature review only included published papers on poultry offal meal developed in Brazil, and that had AMEn and TMEn values obtained by the total excreta collection method from growing broiler chickens and the chemical composition in crude protein (CP), ether extract (EE), mineral matter (MM), gross energy (GE), calcium (Ca) and phosphorus (P). The general equation obtained to estimate AMEn values of poultry offal meal was: AMEn = -2315.69 + 31.4439(CP) + 29.7697(MM) + 0.7689(GE) - 49.3611(Ca), R² = 72%. For meals with high fat contents (higher than 15%) and low mineral matter contents (lower than 10%), it is suggest the use of the equation AMEn = + 3245.07 + 46.8428(EE), R² = 76%, and for meals with high mineral matter content (higher than 10%), it is suggest the equations AMEn = 4059.15 - 440.397(P), R² = 82%. To estimate values of TMEn, it is suggested for meals with high mineral matter content the equation: TMEn = 5092.57 - 115.647(MM), R² = 78%, and for those with low contents of this component, the option is the equation: TMEn = 3617.83 - 15.7988(CP) - 18.2323(EE) - 96.3884(MM) + 0.4874(GE), R² = 76%.
Highlights
IntroductionA total of 22 prediction equations of energy values in poultry offal meal was found in this review
Due to variability in the chemical composition of poultry offal meal, researches and nutritionists have faced difficulties in using this ingredient in rations, regarding the ideal levels of use and which nutrition matrix to use when formulating.Albino & Silva (1996) proposed that the use of prediction equations in determining energy values in animal-origin food is a viable and practical alternative to correct the variants in the composition of these ingredients, which are inherited from the production process and that adjust well to routine quality control procedures in the companies.A total of 22 prediction equations of energy values in poultry offal meal was found in this review
Only the works that presented AMEn and TMEn values obtained by using the traditional method of collecting total excreta from growing broiler chickens, and the chemical composition in terms of crude protein (CP), ether extract (EE), mineral matter (MM), gross energy (GE), calcium (Ca) and phosphorus (P), were privileged and used
Summary
A total of 22 prediction equations of energy values in poultry offal meal was found in this review From this total, eight predict the energy value in the apparent metabolizable energy system corrected for nitrogen balance, and the other fourteen predict the real metabolizable energy system, corrected for the nitrogen balance. Eight predict the energy value in the apparent metabolizable energy system corrected for nitrogen balance, and the other fourteen predict the real metabolizable energy system, corrected for the nitrogen balance Both energy partition systems are intrinsically different, primarily because of the attainment methodology and, implicitly because of the bird age physiological effect on energy use, demonstrated by the same category used in each method. It is observed that the number of variables considered in the prediction method is of great value, since it is necessary that the variable to be predicted (v) assumes correlations with more simple and routine laboratory analysis, being idealized and monovariate
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