Modelagem comparativa da cinética de fluxo da fase sólida do capim-elefante (Pennisetum purpureum, Schumack) consumido sob pastejo por vacas mestiças Holandês × Zebu em lactação

Lopes, Fernando César Ferraz; Rodríguez, N. M.; Aroeira, Luiz Januário Magalhães; Deresz, F.; Sampaio, Ivan Barbosa Machado; Maldonado-Vasquez, H.; Vittori, A.

doi:10.1590/s0102-09352003000600008

Cited by 2 publications

(6 citation statements)

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“…1), a partir dos modelos de Grovum e Williams (1973) e de Dhanoa et al (1985) apresentaram-se dentro da faixa de valores relatados por Lopes et al (2003), a saber, de 2,1 a 4,1%/h para k 1 , e de 3,9 a 11,3%/h para k 2 . Esses autores trabalharam com os modelos de Grovum e Williams (1973) e de Dhanoa et al (1985) Dhanoa et al (1985).…”

Section: Resultsunclassified

“…2), os valores obtidos foram considerados atípicos em termos biológicos, subjeção respaldada, principalmente, pela desuniformidade na dispersão dos resíduos ordinários e pelo menor valor de R 2 . Conforme também observaram Lopes et al (2003), houve aparente retenção do indicador no TGI desta vaca, constatada por concentração fecal do cromo relativamente elevada, mesmo depois de decorridas 120h da administração do indicador FDN-cromo-mordente. Dhanoa et al (1985).…”

Section: Resultsunclassified

“…1 e 2). Resultados semelhantes foram apresentados por Oliveira et al (1999) e por Lopes et al (2003).…”

Section: Resultsunclassified

“…Para vacas em lactação manejadas em pastagem de capimelefante, não foi observada superioridade de um modelo em relação ao outro no ajuste aos dados de excreção fecal de cromo (Lopes et al, 2003).…”

Section: Introductionunclassified

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Modelagem comparativa da cinética da fase sólida do capim-elefante picado, suplementado ou não com concentrados, e fornecido a vacas Holandês x Zebu em lactação

Lopes

Oliveira

Paciullo

et al. 2008

Arq. Bras. Med. Vet. Zootec.

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Section: Resultsunclassified

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Modelagem comparativa da cinética da fase sólida do capim-elefante picado, suplementado ou não com concentrados, e fornecido a vacas Holandês x Zebu em lactação

Lopes

Oliveira

Paciullo

et al. 2008

Arq. Bras. Med. Vet. Zootec.

Self Cite

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“…There are many variables involved in the DMI regulation by grazing animals and, therefore, the interactions of the factors environment, animal (age, crossbred, physiological state, etc.) and changes in forage availability and quality (Lopes et al, 2003) must be considered, especially in tropical conditions. Evaluating the CNCPS model on the prediction of milk production, the model underestimated (P<0.05) observed values, which presented a mean of 10.1 kg/cow/day, while the predicted average output was 3.8 kg/day, a difference of 62.4%.…”

Section: Dry Matter Intake (%Bw)mentioning

confidence: 99%

Evaluation of the Cornell Net Carbohydrate and Protein System model on the prediction of dry matter intake and milk production of grazing crossbred cows

et al. 2012

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-The Cornel Net Carbohydrate and Protein System model version 5.0 was assessed as for its prediction of dry matter intake and milk production of grazing lactating Holstein × Zebu cows. Eight lactating cows grazing elephant grass (Pennisetum purpureum, Schum., cv. Napier) were used in two experiments of 30 days each. The experimental design was of randomized blocks (subplots). Dry matter intake was estimated using the chromium oxide and in vitro dry matter digestibility techniques. The estimated dry matter intake was compared with the values predicted by the model. Extrusa samples of the elephant grass pasture were obtained from a cow with esophageal fistula during nine days in each experimental period.Carbohydrate and nitrogenous fractions were analyzed and the degradation rate of carbohydrate was estimated by the gas production technique. The inputs referring to the animals (body weight, age, milk production, milk composition and breed type), to the environment (temperature, relative humidity of air and management condition) and to feeds chemical composition in each experimental period were inserted in the model. The model was accurate on the prediction of dry matter intake, considering that the mean values obtained by the chromium oxide technique and predicted by model (2.45 and 2.46% of body weight, respectively) did not differ significantly from each other. However, the model underestimated the observed milk production in 62.4%, where the metabolizable energy was the first limiting. These results demonstrate the need for studies that provide the development of a database for tropical foods (chemical composition and dynamics of rumen fermentation) and fitting of the model to the tropical conditions, for its appropriate application in formulation of diets and supplements in these regions.

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Modelagem comparativa da cinética de fluxo da fase sólida do capim-elefante (Pennisetum purpureum, Schumack) consumido sob pastejo por vacas mestiças Holandês × Zebu em lactação

Abstract: Modelagem comparativa da cinética de fluxo da fase sólida do capim-elefante (Pennisetum purpureum, Schumack) consumido sob pastejo por vacas mestiças Holandês × Zebu em lactação

Cited by 2 publications

References 20 publications

Modelagem comparativa da cinética da fase sólida do capim-elefante picado, suplementado ou não com concentrados, e fornecido a vacas Holandês x Zebu em lactação

Modelagem comparativa da cinética da fase sólida do capim-elefante picado, suplementado ou não com concentrados, e fornecido a vacas Holandês x Zebu em lactação

Evaluation of the Cornell Net Carbohydrate and Protein System model on the prediction of dry matter intake and milk production of grazing crossbred cows

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