Evaluation of equations for predicting ileal nutrient digestibility and digestible nutrient content of broiler diets based on their gross chemical composition

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dc.citation.issueJune 2024
dc.citation.volume312
dc.contributor.authorThiruchchenthuran S
dc.contributor.authorLopez-Villalobos N
dc.contributor.authorZaefarian F
dc.contributor.authorAbdollahi MR
dc.contributor.authorWester TJ
dc.contributor.authorPedersen NB
dc.contributor.authorStorm AC
dc.contributor.authorCowieson AJ
dc.contributor.authorMorel PCH
dc.date.accessioned2024-08-14T23:27:12Z
dc.date.available2024-08-14T23:27:12Z
dc.date.issued2024-06
dc.description.abstractThe coefficient of apparent ileal digestibility (CAID) and ileal digestible contents (IDC) of nutrients of 56 diets using 10 feed ingredients were measured in broilers (21–24 d post-hatch). Diets contained varying inclusion levels of traditional and non-traditional ingredients and differed widely in chemical composition. The chemical composition and in vivo digestibility values were used to establish prediction equations for CAID and IDC of nutrients using stepwise multiple regression. The strength and accuracy of the developed equations were evaluated by root mean square error (RMSE), coefficient of determination (R2), adjusted R2 (adj. R2), and Akaikie's Information Criteria (AIC). The bootstrap method was used to validate the choice of variables by stepwise selection method in the original equation based on their frequencies of selection. Selection of variables was validated if the variables that appear in the original stepwise model were selected in more than 30% of the 1000 bootstrap samples. A close agreement between the original equations and bootstrap resampling was observed for CAID of nitrogen (N) and energy and IDC of energy, starch, and calcium (Ca). Additionally, the original data was subjected to another run of stepwise regression analysis using the selected variables by bootstrapping. The initial regression showed that the CAID of N and energy was highly dependent on crude fibre (CF) and energy contents of the diets. The CAID of energy can be predicted (R2 = 0.89 and RMSE = 0.035) by CF, gross energy (GE), CF2, and starch-to-CF ratio (starch:CF). Calcium content had a positive influence, while phosphorus (P) content had a negative influence on the prediction of CAID of fat. The main variable to predict CAID and IDC of most nutrients was the dietary CF content. Based on the lowest RMSE and AIC, the best predictors for IDC of N were ash, N, fat, CF, CF2, and starch:CF, while the best predictors for IDC of energy were CF, GE, CF2, and starch:CF. The results of the original stepwise regression models and the stepwise regression with the selected variables from the bootstrap results for CAID of N, energy, fat, and DM, as well as IDC of energy, starch, and Ca, were the same with no differences in R2, Adj. R2, RMSE, and AIC. This method can be useful for developing stable and reproducible models using stepwise regression. However, an external validation is needed to confirm the use of these equations in commercial settings.
dc.description.confidentialfalse
dc.identifier.citationThiruchchenthuran S, Lopez-Villalobos N, Zaefarian F, Abdollahi MR, Wester TJ, Pedersen NB, Storm AC, Cowieson AJ, Morel PCH. (2024). Evaluation of equations for predicting ileal nutrient digestibility and digestible nutrient content of broiler diets based on their gross chemical composition. Animal Feed Science and Technology. 312. June 2024.
dc.identifier.doi10.1016/j.anifeedsci.2024.115974
dc.identifier.eissn1873-2216
dc.identifier.elements-typejournal-article
dc.identifier.issn0377-8401
dc.identifier.number115974
dc.identifier.piiS0377840120304314
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/71305
dc.languageEnglish
dc.publisherElsevier B V
dc.publisher.urihttps://www.sciencedirect.com/science/article/pii/S0377840124001020
dc.relation.isPartOfAnimal Feed Science and Technology
dc.rights(c) 2024 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectBootstrapping
dc.subjectIleal digestibility
dc.subjectIleal digestible content
dc.subjectPrediction equation
dc.subjectStepwise multiple regression
dc.subjectValidation
dc.titleEvaluation of equations for predicting ileal nutrient digestibility and digestible nutrient content of broiler diets based on their gross chemical composition
dc.typeJournal article
pubs.elements-id488593
pubs.organisational-groupOther
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