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Seleção de Partículas da Dieta de Bovinos de Corte em Confinamento Alimentados com Diferentes Forragens e Alojados em Baias Individuais ou Coletivas

DOI: http://dx.doi.org/10.14269/2318-1265/jabb.v4n2p55-64

http://www.jabbnet.com/ 

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Sergio A. S. Custodio1, Flavio L. Claudio2, Estenio M. Alves2, Guido Calgaro Júnior2, Tiago P. Paim2 & Eduardo R. Carvalho2

 

Resumo: O consumo seletivo de partículas da ração é um hábito natural dos bovinos que pode resultar em inconsistências no valor nutricional da dieta. Vinte e quatro machos não castrados F1 Red Norte × Nelore com peso vivo médio inicial de 439,8 ± 59,6 kg e 21,7 ± 2,7 meses de idade foram distribuídos em três grupos experimentas e alojados em baias individuais (12 animais) ou coletivas (12 animais em três baias) no Setor de Bovinocultura do Instituto Federal de Educação, Ciência e Tecnologia Goiano (Campus Iporá). O experimento teve duração de 84 dias (14 dias para adaptação e 70 para coleta de dados). Os animais receberam dietas contendo cana-de-açúcar in natura (CI), silagem de cana (SC) ou silagem de milho (SM) como fontes de forragem. Avaliou-se o consumo seletivo de partículas da ração a cada 14 dias às 4, 10 e 24 horas pós-alimentação, utilizando-se um conjunto com três peneiras e um fundo liso (“Penn State Particle Separator”) para determinar partículas longas (>19 mm), médias (<19, >8 mm), curtas (<8, >1,18 mm) e muito curtas (<1,18 mm). Não houve efeito (P>0,05) de fonte de forragem sobre o consumo seletivo de partículas longas, médias e curtas. A SM aumentou (P<0,05) a rejeição pelas partículas muito curtas, em comparação com a CI e a SC. Não houve resposta (P>0,05) de alojamento sobre a seleção de partículas. As fontes de forragem avaliadas nesse estudo determinaram consumo preferencial das partículas longas (>19 mm) e médias (<19, >8 mm), o que pode ser benéfico para a saúde do rúmen.

Palavras-chave: cana-de-açúcar, comportamento ingestivo, preferência alimentar, Red Norte, silagem de milho, tamanho de partícula

 

Abstract: Feed sorting is a natural behavior of cattle that can result in inconsistencies in the nutritive value of the diet. Twenty-four non-castrated F1 Red Norte × Nelore males with an average initial body weight of 439.8 ± 59.6 kg and 21.7± 2.7 months of age were distributed in three experimental groups, and housed either in individual (12 animals) or collective pens (12 animals in three collective pens) at the Cattle Research and Education Center of the Instituto Federal de Educação, Ciência e Tecnologia Goiano (Campus Iporá). The experiment lasted 84 days (14 days of adaptation and 70 days for data collection). Animals were fed diets containing sugar cane in natura (CI), sugar cane silage (SC) or corn silage (CS) as sources of forage. Feed sorting was determined every 14 days at 4, 10, and 24 hours post-feeding using a three-screen and a bottom pan (Penn State Particle Separator) to yield long (>19 mm), medium (<19, >8 mm), short (<8, >1.18 mm) and fine (<1.18 mm) particles. There was no effect (P>0.05) of source of forage on feed sorting for long, medium, and short particles. CS increased (P<0.05) sorting against fine particles compared with CI and SC. There was no response (P>0.05) of type of housing on feed sorting. The sources of forage evaluated in this study resulted in preferential consumption for long and medium particles, which may be beneficial for rumen health.

Key words: corn silage, feeding behavior, feeding preference, particle size, Red Norte, sugar cane

 

1 Instituto Federal de Educação, Ciência e Tecnologia de Goiás (IFG), Campus Rio Verde. email: eduardo.carvalho@ifgoiano.edu.br
2 Instituto Federal de Educação, Ciência e Tecnologia de Goiás (IFG), Campus Iporá.

 

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