Sistema de suplementação alimentar para bovinos de corte em pastejo. Simulação
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Revista Brasileira de Zootecnia
Abstract
Objetivou-se com este trabalho demonstrar a aplicação do Sistema Viçosa de Formulação de Rações na recomendação de suplementos alimentares para bovinos de corte com 200 e 400 kg de peso corporal, em diferentes épocas de diferimento e utilização dos pastos. Verificou-se que, para animais com 200 kg de peso corporal ganhar 1 kg/dia no pasto diferido em fevereiro e utilizado em junho ou setembro, ou diferido em abril e utilizado em junho ou setembro, houve necessidade de 2,16; 3,60; 0,50 e 3,23 kg de suplemento/animal/dia, respectivamente. Para animais com 400 kg de peso corporal, a necessidade de suplementação foi ainda maior: 4,21; 5,86; 2,48 e 5,24 kg/animal/dia. O teor de uréia (1,4; 0,9; 9,8 e 0,9; e 5,3; 0,9; 16,5 e 0,4%, respectivamente) e o teor e a composição da mistura mineral nos suplementos também variaram muito nessas diferentes situações. O Sistema Viçosa de Formulação de Rações possibilitou formular suplementos específicos para cada situação, de uma maneira rápida e eficiente, com base em equações de estimativas de consumo de suplemento em função do peso corporal do animal e nível de uréia, permitindo formular suplementos apenas para corrigir as deficiências nutricionais ou para se obter ganhos de peso mais elevados.
This work aimed to demonstrate the application of a computer system (Sistema Viçosa de Formulação de Rações) in the recommendation of feed supplements for beef cattle with 200 and 400 kg of body weight, on different pasture deferring and utilization periods. In order to an animal of 200 kg of body weight achieve 1 kg of daily gain in a pasture deferred in February and used in June or September, or deferred in April and used in June or September, it was necessary 2.16, 3.60, 0.50 and 3.23 kg of supplement/animal/day, respectively. In order to an animal of 400 kg of body weight, the need for supplementation was even greater: 4.21, 5.86, 2.48 and 5.24 kg/animal/day. The urea content (1.4, 0.9, 9.8 and 0.9; and 5.3, 0.9, 16.5 and 0.4%, respectively) and the mineral mixture content and composition in the supplements also changed dramatically in these different situations. The computer system allows to formulate specific supplements for each situation, in a rapid and efficient way, based on equations of supplement intake as a function of animal body weight and urea level, allowing to make supplements only for correction of nutritional deficiency or to obtain higher daily gains.
This work aimed to demonstrate the application of a computer system (Sistema Viçosa de Formulação de Rações) in the recommendation of feed supplements for beef cattle with 200 and 400 kg of body weight, on different pasture deferring and utilization periods. In order to an animal of 200 kg of body weight achieve 1 kg of daily gain in a pasture deferred in February and used in June or September, or deferred in April and used in June or September, it was necessary 2.16, 3.60, 0.50 and 3.23 kg of supplement/animal/day, respectively. In order to an animal of 400 kg of body weight, the need for supplementation was even greater: 4.21, 5.86, 2.48 and 5.24 kg/animal/day. The urea content (1.4, 0.9, 9.8 and 0.9; and 5.3, 0.9, 16.5 and 0.4%, respectively) and the mineral mixture content and composition in the supplements also changed dramatically in these different situations. The computer system allows to formulate specific supplements for each situation, in a rapid and efficient way, based on equations of supplement intake as a function of animal body weight and urea level, allowing to make supplements only for correction of nutritional deficiency or to obtain higher daily gains.