estimação da digestibilidade do extrato etéreo em ruminantes a partir dos teores dietéticos: desenvolvimento de um modelo para condições brasileiras estimation of ether extract digestibility in diets of ruminants: a model under brazilian conditions
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2006
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Abstract
Objetivou-se neste estudo propor e validar um modelo para estimação da fração aparentemente digestível do EE a partir dos teores dietéticos em bovinos. As bases teóricas para o desenvolvimento do modelo fundamentaram-se no coeficiente de digestibilidade verdadeiro e na contribuição metabólica fecal. O método de estimação destes parâmetros baseou-se no teste de entidade nutricional. O banco de dados utilizado para construção do modelo foi constituído por 48 e 60 médias experimentais para vacas em lactação e bovinos em crescimento e terminação, respectivamente, tomadas de 24 experimentos, 12 para cada categoria animal. Adotou-se o esquema de identidade de modelos por variável Dummy para diferenciação entre categorias animais. O banco de dados utilizado para validação do modelo proposto foi obtido de três experimentos, sendo dois com vacas em lactação e um com bovinos em crescimento. O coeficiente de digestibilidade verdadeiro do EE não diferiu entre categorias animais, cuja estimativa foi de 0,8596. Verificou-se superioridade da fração metabólica fecal para vacas em lactação. Essa porção mostrou-se não relacionada ao teor de EE (EE%) na dieta, quando expressa como percentual dietético, para ambas as categorias. Assim, para animais em condições de alimentação ad libitum, o teor de EE aparentemente digestível (EEad%) pode ser estimado pelas equações: EEad% = 0,8596EE% - 0,21, para vacas em lactação; e EEad% = 0,8596EE% - 0,18, para bovinos em crescimento e terminação. O processo de validação indicou similaridade entre valores preditos e observados de EEad% para ambas as categorias animais. Conclui-se que os modelos propostos poderão ampliar a acurácia de predição do teor de nutrientes digestíveis totais a partir da composição química da dieta.
The objective of this study was to develop and validate a model to estimate the EE apparently digestible fraction from different cattle diets. True digestibility coefficients and metabolic fecal contribution were the main parameters fitted to the model. The estimation method for both parameters was based on the Lucas test. The dataset used to build the model contained 48 and 60 experimental means for lactating cows and growing and finishing cattle, respectively. Data were taken from 24 experiments (12 experiments for each animal category). Comparison between animal categories was done by using a Dummy variable. The dataset used for model validation originated from two independent trials with lactating cows and one trial with growing cattle. The true digestibility coefficient (0.8596) did not differ between animal categories. It was observed greater metabolic fecal EE for lactating cows than for growing and finishing cattle. The metabolic fecal EE did not change with different dietary EE levels (EE%), when expressed as a percentage of dietary EE. Therefore, the EE apparently digestible in the diet (EEad%) can be estimated by the following equations: EEad% = 0.8596EE% - 0.21 for lactating cows and EEad% = 0.8596EE% - 0.18 for growing and finishing cattle. The validation procedure indicated that observed and estimated values of EEad% were not different for both animal categories. It was concluded that the proposed model can improve the accuracy of total digestible nutrients prediction based on chemical composition of the diet.
The objective of this study was to develop and validate a model to estimate the EE apparently digestible fraction from different cattle diets. True digestibility coefficients and metabolic fecal contribution were the main parameters fitted to the model. The estimation method for both parameters was based on the Lucas test. The dataset used to build the model contained 48 and 60 experimental means for lactating cows and growing and finishing cattle, respectively. Data were taken from 24 experiments (12 experiments for each animal category). Comparison between animal categories was done by using a Dummy variable. The dataset used for model validation originated from two independent trials with lactating cows and one trial with growing cattle. The true digestibility coefficient (0.8596) did not differ between animal categories. It was observed greater metabolic fecal EE for lactating cows than for growing and finishing cattle. The metabolic fecal EE did not change with different dietary EE levels (EE%), when expressed as a percentage of dietary EE. Therefore, the EE apparently digestible in the diet (EEad%) can be estimated by the following equations: EEad% = 0.8596EE% - 0.21 for lactating cows and EEad% = 0.8596EE% - 0.18 for growing and finishing cattle. The validation procedure indicated that observed and estimated values of EEad% were not different for both animal categories. It was concluded that the proposed model can improve the accuracy of total digestible nutrients prediction based on chemical composition of the diet.
| Reference Key |
detmann2006revistaestimao
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| Authors | ;Edenio Detmann;Sebastião de Campos Valadares Filho;Douglas dos Santos Pina;José Maurício de Souza Campos;Mário Fonseca Paulino;André Soares de Oliveira;Polyana Albino Silva |
| Journal | european journal of lipid science and technology |
| Year | 2006 |
| DOI |
10.1590/S1516-35982006000500029
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| URL | |
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