Sex effects on macromineral requirements for growth in Saanen goats: A meta-analysis

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dc.contributor.authorVargas, J. A. C. [UNESP]
dc.contributor.authorAlmeida, A. K. [UNESP]
dc.contributor.authorSouza, A. P. [UNESP]
dc.contributor.authorFernandes, M. H. M. R. [UNESP]
dc.contributor.authorResende, K. T. [UNESP]
dc.contributor.authorTeixeira, I. A. M. A. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-11-29T04:28:34Z
dc.date.available2018-11-29T04:28:34Z
dc.date.issued2017-10-01
dc.description.abstractThe aim of this study was to investigate the effects of sex on the net requirements of growth for Ca (NCag), P (NPg), Na (NNag), K (NKg), and Mg (NMgg) in Saanen goats from 5 to 45 kg BW, with or without consideration of the degree of maturity. A database containing 209 individual records for Saanen goats (69 castrated males, 71 intact males, and 69 females) was generated from 6 comparative slaughter studies. Total amounts of Ca, P, Na, K, and Mg in the body were fitted to logarithmized allometric equations using empty BW (EBW) or degree of maturity (EBW/mature EBW) as regressors. The equations were fitted using a mixed model, where sex was considered a fixed effect and study was considered a random effect. Net requirements were estimated by the first derivative of the logarithmized allometric equations. Then, a Monte Carlo simulation was used to assess the uncertainty of calculated net requirement values. Without considering the degree of maturity, sex did not affect NCag, NPg, and NNag (P > 0.10). Conversely, considering the degree of maturity, NCag and NPg of intact males were 5% and 2%, respectively, greater than those of castrated males and females (P < 0.01), and NNag of males (castrated and intact) was 6% greater than that of females (P < 0.01). Regardless of approach used, NCag and NPg remained constant, whereas NNag decreased by 32% as BW ranged from 5 to 45 kg. Without considering the degree of maturity, NMgg of castrated and intact males were 8% and 18% greater than that of female goats (P = 0.054), respectively. Hereof NMgg of castrated and intact males increased by 8% and 15%, respectively, whereas that of females decreased by 8% as BW ranged from 5 to 45 kg. Considering the degree of maturity, NMgg of castrated and intact males were 7% and 17% greater than that of female goats (P = 0.054), respectively. In this regard, NMgg of castrated and intact males increased 8% and 16%, respectively, whereas that of females decreased by 7% from 5 to 45 kg BW. Both approaches showed that, regardless of sex (P > 0.10), NKg decreased by 26% (i.e., without considering the maturity degree) or 27% (i.e., considering the degree of maturity) from 5 to 45 kg BW. Therefore, the consideration of maturity stage highlights differences across sexes in the net macromineral requirements for growth in goats. Elucidation of sex effects on macromineral requirements for growth may be useful for improving the accuracy of recommendations for mineral requirements for dairy goats.en
dc.description.affiliationUniv Estadual Paulista, Dept Anim Sci, BR-14884900 Sao Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Anim Sci, BR-14884900 Sao Paulo, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipAsociacion Universitaria Iberoamericana de Postgrado AUIP
dc.description.sponsorshipIdFAPESP: 2014/14734-9
dc.description.sponsorshipIdAsociacion Universitaria Iberoamericana de Postgrado AUIP: 166754-1
dc.format.extent4646-4657
dc.identifierhttp://dx.doi.org/10.2527/jas2017.1825
dc.identifier.citationJournal Of Animal Science. Champaign: Amer Soc Animal Science, v. 95, n. 10, p. 4646-4657, 2017.
dc.identifier.doi10.2527/jas2017.1825
dc.identifier.issn0021-8812
dc.identifier.urihttp://hdl.handle.net/11449/165916
dc.identifier.wosWOS:000417113600041
dc.language.isoeng
dc.publisherAmer Soc Animal Science
dc.relation.ispartofJournal Of Animal Science
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectallometry
dc.subjectcomparative slaughter
dc.subjectmature weight
dc.subjectmineral requirement
dc.subjectuncertainty
dc.titleSex effects on macromineral requirements for growth in Saanen goats: A meta-analysisen
dc.typeArtigo
dcterms.rightsHolderAmer Soc Animal Science

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