Silagem de soja e de milho na alimentação de bovinos de corte / Soybean and corn silage in beef cattle feeding

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

26/02/2010

RESUMO

Two experiments were carried with out to evaluate the intake and total nutrient digestibilities, pH and ruminal ammonia concentration (Experiment 1) and the productive performance of beef cattle (Experiment 2) fed diets containing different proportions of corn (CS) and soybean silage (SS). The experimental diets consisted: 1- 60% CS and 40% concentrate (control); 2-20% SS:80% CS; 3-40% SS:60% CS and 4- 60% SS:40% CS, both diets, in DM basis. In the first experiment, four crossbred Holstein-Zebu, rumen and abomasum fistulated steers, 350 kg average inicial weight were assigned to in a 4 × 4 latin square design. Chromic oxide was used as marker to estimate fecal excrection. The intakes of dry matter (DM), organic matter (OM), crude protein (CP) and total digestible nutrients (TDN), expressed as kg day-1 were higher (P <0.05) for animals fed diet control. For ether extract (EE) recorded a higher (P <0.05) intake for diets containing soybean, which in turn did not differ (P>0.05) among them. Lower digestibilities of DM, OM and neutral detergent fiber (NDF) were registered for diet with 60% of SS. There were effects of diet for rumen pH and diet and sampling timefor ruminal ammonia. In the Experiment 2 were used 24 crossbred Holstein x Zebu steers, 350 kg average inicial weight in a randomized block design with four treatments and six replications. The experiment lasted 99 days, divided into three periods of 28 days, after 15 days of adaptation. Fecal excretion was estimated using indigestible neutral detergent fiber (NDFi) as indicator, after in situ incubation for 240 hours. The DM, OM andTDN intakes in kg day-1, were higher (P <0.05) for animals fed control diet. The apparent digestibility of EE was not affected (P>0.05) by diets. However, there was effect (P <0.05) of diets for digestibility of other nutrients. Higher average daily gain (P <0.05) was observed for animals fed control diet. We conclude that the inclusionof different levels of soybean silage associated with corn silage as exclusive sources of food did not favor nutrient intakes, which contributed to a worse performance of animals, without affecting the pattern of fermentation rumen.

ASSUNTO(S)

digestibilidade ganho de peso pastagem e forragicultura digestibility higher average

ACESSO AO ARTIGO

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