Predicting nitrogen excretion of cattle kept under tropical and subtropical conditions using semimechanistic models

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dc.contributor.authorSalazar‐Cubillas, Khaterine
dc.contributor.authorCorea, Edgardo
dc.contributor.authorDickhöfer, Uta
dc.date.accessioned2024-08-19T12:58:27Z
dc.date.available2024-08-19T12:58:27Z
dc.date.issued2023de
dc.description.abstractThe present study aims at evaluating whether current semimechanistic models developed for temperate cattle systems can be adopted for cattle under (sub‐) tropical husbandry systems to adequately (accurately and precisely) predict total nitrogen (TN), urine nitrogen (UN), faecal nitrogen (FN) excretion and its partition into different FN fractions. Selected models were built based on the feeding recommendations for ruminants of the British (Model A), German (Model G) and French (INRA; Model I) system. Model evaluation was conducted using eight nitrogen balance studies performed in El Salvador, Kenya and Peru (n = 392 individual observations including lactating cows, heifers and steers). Concordance correlation coefficient, root mean square errors (RMSE), and mean biases were estimated to evaluate the models' adequacy in predicting nitrogen excretion. Input variables causing greatest variation in nitrogen excretion prediction were identified by a sensitivity analysis and adjusted. Model G was able to adequately (i.e., RMSE of <25% of observed mean, systematic error of <5% of the mean square error) predict TN excretion through a compensation between overestimation of UN excretion and underestimation of FN excretion. None of the models were able to adequately predict UN, FN, and different FN fractions. Model I adequately predicted FN (RMSE = 18%) when duodenal microbial crude protein flow was increased, and the intercept used to predict FN excretion was reduced from 4.30 to 3.82 g of nitrogen per kilogram of dry matter intake. These adjustments, however, were not sufficient to predict adequately UN excretion (RMSE = 38%), individual FN fractions (RMSE > 56%), and TN (RMSE = 22%) excretion, by Model I.en
dc.identifier.urihttps://hohpublica.uni-hohenheim.de/handle/123456789/16082
dc.identifier.urihttps://doi.org/10.1111/jpn.13904
dc.language.isoengde
dc.rights.licensecc_by-nc-ndde
dc.source1439-0396de
dc.sourceJournal of Animal Physiology and Animal Nutrition; Vol. 108, No. 2 (2023), 423-438de
dc.subjectNitrogen excretion
dc.subjectCattle systems
dc.subjectTropical husbandry
dc.subjectModel evaluation
dc.subjectSemimechanistic models
dc.subjectFeeding recommendations
dc.subjectRoot mean square error (RMSE)
dc.subjectSensitivity analysis
dc.subjectTotal nitrogen (TN)
dc.subjectFaecal nitrogen (FN)
dc.subject.ddc630
dc.titlePredicting nitrogen excretion of cattle kept under tropical and subtropical conditions using semimechanistic modelsen
dc.type.diniArticle
dcterms.bibliographicCitationJournal of animal physiology and animal nutrition, 108 (2023), 2, 423-438. https://doi.org/10.1111/jpn.13904. ISSN: 1439-0396
dcterms.bibliographicCitation.issn1439-0396
dcterms.bibliographicCitation.issue2
dcterms.bibliographicCitation.journaltitleJournal of animal physiology and animal nutrition
dcterms.bibliographicCitation.volume108
local.export.bibtex@article{Salazar‐Cubillas2023, url = {https://hohpublica.uni-hohenheim.de/handle/123456789/16082}, doi = {10.1111/jpn.13904}, author = {Salazar‐Cubillas, Khaterine and Corea, Edgardo and Dickhoefer, Uta et al.}, title = {Predicting nitrogen excretion of cattle kept under tropical and subtropical conditions using semimechanistic models}, journal = {Journal of animal physiology and animal nutrition}, year = {2023}, volume = {108}, number = {2}, }
local.export.bibtexAuthorSalazar‐Cubillas, Khaterine and Corea, Edgardo and Dickhoefer, Uta et al.
local.export.bibtexKeySalazar‐Cubillas2023
local.export.bibtexType@article

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Institut für Tropische Agrarwissenschaften (Hans-Ruthenberg-Institut)