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      Estimativa da composição química corporal de tourinhos Santa Gertrudes a partir da composição química e física das 9-10-11ª costelas Translated title: Estimation of the empty body chemical composition of Santa Gertrudis bulls using the chemical and physical composition of the 9-10-11th ribs cut

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          Abstract

          Foram obtidas equações de regressão linear simples para estimar a composição química corporal de bovinos Santa Gertrudes, a partir da composição química e física do corte das 9-10-11ª costelas. Quinze tourinhos, entre nove a 15 meses de idade e de 220 a 505 kg de peso, foram mantidos confinados. Os animais foram abatidos após jejum completo de 18 horas, sendo que seis deles foram abatidos após adaptação. A composição química em água, proteína, extrato etéreo e minerais foi determinada no corte das costelas e em amostras obtidas após moagem completa e homogeneização de todos os tecidos corporais, divididos em: sangue, couro, cabeça + patas, vísceras e carcaça. A composição física do corte das costelas foi obtida por separação manual do músculo, gordura e ossos. O peso do corpo vazio foi altamente correlacionado ao peso da carcaça quente (r² = 0,99). As porcentagens de água e extrato etéreo das 9-10-11ª costelas mostraram-se altamente correlacionadas com a composição química do corpo vazio, o que não ocorreu para as porcentagens de proteína e minerais. Esses teores foram calculados pela composição do corpo vazio desengordurado. A composição física do corte das costelas foi eficiente para estimar as porcentagens de água, extrato etéreo e minerais do corpo vazio, utilizando-se a porcentagem de gordura separável das costelas, mas não para estimar o teor de proteína. A composição física do corte das costelas demonstrou ser uma técnica eficiente, mas a composição química apresentou maiores coeficientes de determinação e menores erros da estimativa. Como a porcentagem de água no corpo vazio e no corte das costelas (r² = 0,95), e as porcentagens de água e de extrato etéreo no corpo vazio foram altamente correlacionadas (r² = 0,94), a porcentagem de água no corte das 9-10-11ª costelas poderia ser a única variável para estimativa da composição química corporal.

          Translated abstract

          Simple linear regressions to estimate empty body chemical composition of Santa Gertrudis young bulls were obtained, using the physical and chemical composition of the 9-10-11th ribs cut. Fifteen intact males, from nine to fifteen months of age and from 220 to 505 kg of liveweight, were kept confined. They were slaughtered after 18 hours without water and food, and six of them were slaughtered after adaptation period. The content of water, protein, lipid and ash were determined on the ribs cut and on the blood, hide, head + feet, visceras and carcass, and samples were obtained after quantitatively grinding and homogenizing the entire tissue. The physical composition of the ribs was determined by manual separation of bone, lean and fat. Empty body weight was closely related to hot carcass weight (r² = 0.99). Percent water and lipid of the 9-10-11th ribs cut were closely related to the empty body chemical composition, but not to the percent protein and ash, that can be calculated from their proportions on the empty body without fat. The physical composition of the ribs cut was a good estimator of the empty body composition, mainly for the equations using separable ribs fat to estimate the contents of water, ether extract and ash, but not protein content. Despite the good results with the ribs cut physical composition, chemical composition was a more efficient estimator of empty body chemical composition, because the coefficients of determination were higher and the standard errors were lower. As the percentage of water in empty body was closely related to the water percent on 9-10-11th ribs (r² = 0.95) and the percentages of ether extract and water in the empty body (r² = 0.94) were closely related each other, the water in the 9-10-11th ribs cut alone can be used to estimate empty body composition.

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          Choice of a Prediction Equation and the Use of the Selected Equation in Subsequent Experimentation

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            PREDICTING EMPTY BODY COMPOSITION OF CATTLE FROM CARCASS WEIGHT AND RIB CUT COMPOSITION

            Data collected on 43 steers (25 predominantly Hereford breeding (H) and 18 predominantly Angus breeding (A)) were used to generate equations to predict total body composition of Angus and Hereford steers from measurements obtained at slaughter. Empty body fat (ether extract, EBF), kg was predicted from 9–11 rib cut fat (ether extract, RF), kg and warm carcass weight (WCW), kg by the following: H — steers, EBF = − 11.49 + 44.08 RF + 0.22 WCW (R 2 = 0.96, CV = 10.07%) and A — steers, EBF = − 49.30 + 31.30 RF + 0.50 WCW (R 2 = 0.94, CV = 9.40%). Total empty body energy (EBE) (Mcal) was predicted from 9–11 rib cut energy (RE, Mcal) and WCW (kg) by the following: H — steers, EBE = − 252.6 + 28.85 RE + 4.26 WCW (R 2 = 0.94, CV = 10.15%) and A — steers, EBE = − 434.3 + 25.48 RE + 5.64 WCW (R 2 = 0.94, CV = 8.02%). Prediction of EBF and EBE from RF and RE, respectively, differed (P = 0.05) between breeds whereas prediction from WCW did not. For all steers, EBF, kg and EBE, Mcal, respectively, were predicted from WCW, kg, by the following: EBF = − 63.71 + 0.704 WCW (r 2 = 0.91, CV = 12.44%) and EBE = − 537.7 + 7.377 WCW (r 2 = 0.92, CV = 10.0%). Body protein (BP), kg was predicted from WCW, kg by the following: H — steers, BP = 23.31 + 0.154 WCW (r 2 = 0.83, CV = 6.04%) and A — steers, BP = 11.32 + 0.195 WCW (r 2 = 0.93, CV = 5.29%). Prediction of BP was not significantly improved by the inclusion of 9–11 rib protein in the equation with WCW. Prediction of body water and ash from weights of rib cut water and ash, respectively, and warm carcass weight were unacceptable. Non-linear relationships between rib cut component weights and corresponding empty body weights as well as between WCW and empty body component weights were generally not significant (P = 0.05). Inclusion of kidney and pelvic fat weight in these equations did not greatly improve their accuracy.
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              Methods of estimating the physical and chemical composition of cattle

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbz
                Revista Brasileira de Zootecnia
                R. Bras. Zootec.
                Sociedade Brasileira de Zootecnia (Viçosa )
                1806-9290
                June 2003
                : 32
                : 3
                : 709-726
                Affiliations
                [1 ] Instituto Zootecnia
                [2 ] Universidade Estadual Paulista Brazil
                [3 ] Universidade de São Paulo Brazil
                [4 ] Universidade de São Paulo Brazil
                Article
                S1516-35982003000300023
                10.1590/S1516-35982003000300023
                2a8deaf6-fcff-405f-bb28-8bf4016777b6

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-3598&lng=en
                Categories
                AGRICULTURE, DAIRY & ANIMAL SCIENCE
                VETERINARY SCIENCES

                Animal agriculture,General veterinary medicine
                bovines,empty body composition,indirect determination,bovinos,composição do corpo vazio,determinação indireta

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