Models to predict nitrogen excretion from beef cattle fed a wide range of diets compiled from South America

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Autor(es): dc.contributorUniversity of California-
Autor(es): dc.contributorNoble Research Institute LLC-
Autor(es): dc.contributorUniversidade Federal Rural do Rio de Janeiro-
Autor(es): dc.contributorUniversidade Federal de Viçosa (UFV)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversity of Florida-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidad de la República-
Autor(es): dc.contributorCorporación Colombiana de Investigación Agropecuaria-
Autor(es): dc.contributorUniversidade Federal de Minas Gerais (UFMG)-
Autor(es): dc.contributorUniversidade Federal de Santa Maria-
Autor(es): dc.contributorUniversidad de Antioquia-
Autor(es): dc.contributorSwedish University of Agricultural Sciences-
Autor(es): dc.contributorThe Pennsylvania State University-
Autor(es): dc.creatorSouza, Vinícius C.-
Autor(es): dc.creatorCongio, Guilhermo F.S.-
Autor(es): dc.creatorRodrigues, João P.P.-
Autor(es): dc.creatorValadares Filho, Sebastião C.-
Autor(es): dc.creatorSilva, Flávia A.S.-
Autor(es): dc.creatorRennó, Luciana N.-
Autor(es): dc.creatorReis, Ricardo A.-
Autor(es): dc.creatorCardoso, Abmael S.-
Autor(es): dc.creatorRodrigues, Paulo H.M.-
Autor(es): dc.creatorBerchielli, Telma T.-
Autor(es): dc.creatorMessana, Juliana D.-
Autor(es): dc.creatorCajarville, Cecilia-
Autor(es): dc.creatorGranja-Salcedo, Yury T.-
Autor(es): dc.creatorBorges, Ana L.C.C.-
Autor(es): dc.creatorKozloski, Gilberto V.-
Autor(es): dc.creatorRosero-Noguera, Jaime R.-
Autor(es): dc.creatorGonda, Horacio-
Autor(es): dc.creatorHristov, Alexander N.-
Autor(es): dc.creatorKebreab, Ermias-
Data de aceite: dc.date.accessioned2025-08-21T18:50:39Z-
Data de disponibilização: dc.date.available2025-08-21T18:50:39Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2023-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1093/tas/txae072-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/308785-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/308785-
Descrição: dc.descriptionThe objective of this meta-analysis was to develop and evaluate models for predicting nitrogen (N) excretion in feces, urine, and manure in beef cattle in South America. The study incorporated a total of 1,116 individual observations of N excretion in feces and 939 individual observations of N excretion in feces and in urine (g/d), representing a diverse range of diets, animal genotypes, and management conditions in South America. The dataset also included data on dry matter intake (DMI; kg/d) and nitrogen intake (NI; g/d), concentrations of dietary components, as well as average daily gain (ADG; g/d) and average body weight (BW; kg). Models were derived using linear mixed-effects regression with a random intercept for the study. Fecal N excretion was positively associated with DMI, NI, nonfibrous carbohydrates, average BW, and ADG and negatively associated with EE and CP concentration in the diet. The univariate model predicting fecal N excretion based on DMI (model 1) performed slightly better than the univariate model, which used NI as a predictor variable (model 2) with a root mean square error (RMSE) of 38.0 vs. 39.2%, the RMSE-observations SD ratio (RSR) of 0.81 vs. 0.84, and concordance correlation coefficient (CCC) of 0.53 vs. 0.50, respectively. Models predicting urinary N excretion were less accurate than those derived to predict fecal N excretion, with an average RMSE of 43.7% vs. 37.0%, respectively. Urinary and manure N excretion were positively associated with DMI, NI, CP, average BW, and ADG and negatively associated with neutral detergent fiber concentration in the diet. As opposed to fecal N excretion, the univariate model predicting urinary N excretion using NI (model 10) performed slightly better than the univariate model using DMI (model 9) as predictor variable with an RMSE of 36.0% vs. 39.7%, RSR 0.85 vs. 0.93, and CCC of 0.43 vs. 0.29, respectively. The models developed in this study are applicable for predicting N excretion in beef cattle across a broad spectrum of dietary compositions and animal genotypes in South America. The univariate model using DMI as a predictor is recommended for fecal N prediction, while the univariate model using NI is recommended for predicting urinary and manure N excretion because the use of more complex models resulted in little to no benefits. However, it may be more useful to consider more complex models that incorporate nutrient intakes and diet composition for decision-making when N excretion is a factor to be considered. Three extant equations evaluated in this study have the potential to be used in tropical conditions typical of South America to predict fecal N excretion with good precision and accuracy. However, none of the extant equations are recommended for predicting urine or manure N excretion because of their high RMSE, and low precision and accuracy. Reductions in nitrogen (N) excretion in beef cattle not only yield environmental advantages but also confer economic benefits associated with reduced purchase of protein feed ingredients. As measuring N excretion under farm conditions is not feasible, models that can accurately predict N excretion using variables that are more easily obtained in beef production systems are needed. A meta-regression analysis was conducted to develop models that can predict N excretion in feces, urine, and manure in beef cattle in South America. The univariate model using dry matter intake as a predictor is recommended for fecal N prediction, while the univariate model using N intake is recommended for predicting urine and manure N excretion because the use of more complex models resulted in little to no benefits. However, more complex models that incorporate nutrient intakes and diet composition might be more useful for decision-making when N excretion is a factor to be considered. Such models enable simulations of N excretion with modifications to diet composition with similar accuracy. The models developed in this study are applicable for predicting N excretion in beef cattle across a broad spectrum of dietary compositions and animal genotypes in South America.-
Descrição: dc.descriptionDepartment of Animal Science University of California-
Descrição: dc.descriptionNoble Research Institute LLC-
Descrição: dc.descriptionDepartment of Animal Production Animal Science Institute Universidade Federal Rural do Rio de Janeiro, RJ-
Descrição: dc.descriptionDepartment of Animal Sciences Universidade Federal de Viçosa, MG-
Descrição: dc.descriptionDepartment of Animal Science Universidade Estadual Paulista, SP-
Descrição: dc.descriptionRange Cattle Research and Education Center University of Florida-
Descrição: dc.descriptionDepartment of Animal Nutrition and Production Faculdade de Medicina Veterinária e Zootecnia Universidade de São Paulo, SP-
Descrição: dc.descriptionDepartment of Animal Production Health of Production Systems Animal Production Institute Facultad de Veterinaria Universidad de la República, San José-
Descrição: dc.descriptionEl Nus Research Center Corporación Colombiana de Investigación Agropecuaria, Antioquia-
Descrição: dc.descriptionDepartment of Animal Science Universidade Federal de Minas Gerais, MG-
Descrição: dc.descriptionDepartment of Animal Science Universidade Federal de Santa Maria, RS-
Descrição: dc.descriptionFaculty of Agricultural Sciences Universidad de Antioquia, Antioquia-
Descrição: dc.descriptionDepartment of Animal Nutrition and Management Faculty of Veterinary Medicine and Animal Science Swedish University of Agricultural Sciences-
Descrição: dc.descriptionDepartment of Animal Science The Pennsylvania State University-
Descrição: dc.descriptionDepartment of Animal Science Universidade Estadual Paulista, SP-
Idioma: dc.languageen-
Relação: dc.relationTranslational Animal Science-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectenvironmental impacts-
Palavras-chave: dc.subjectgrazing cattle-
Palavras-chave: dc.subjectmeta-analysis-
Palavras-chave: dc.subjectprotein metabolism-
Título: dc.titleModels to predict nitrogen excretion from beef cattle fed a wide range of diets compiled from South America-
Tipo de arquivo: dc.typelivro digital-
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