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Influence of intraruminal infusion of propionic acid and forage to concentrate levels on intake, digestibility and rumen characteristics in young bulls Influência da infusão ruminal de ácido propiônico e da relação volumoso: concentrado sobre o consumo e digestibilidade e características ruminais em novilhos

This study aimed to evaluate the effect of intraruminal infusion of propionic acid (RPA) associated to two (80:20 and 60:40) forage:concentrate ratios (FCR), for young bulls. Four Holstein × Zebu crossbred young bulls with average age of 7 months and 160 kg of body weight (BW) were distributed to a...

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Bibliographic Details
Published in:Revista brasileira de zootecnia 2009-05, Vol.38 (5), p.948-955
Main Authors: Marinaldo Divino Ribeiro, José Carlos Pereira, Augusto César de Queiroz, Vitor Pereira Bettero, Hilário Cuquetto Mantovani, Cássio José da Silva
Format: Article
Language:English
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Summary:This study aimed to evaluate the effect of intraruminal infusion of propionic acid (RPA) associated to two (80:20 and 60:40) forage:concentrate ratios (FCR), for young bulls. Four Holstein × Zebu crossbred young bulls with average age of 7 months and 160 kg of body weight (BW) were distributed to a 4 × 4 Latin square design. A total mixed ration, isonitrogenous diets, was ad libitum fed to animals. The propionic acid was obtained by fermentation of reconstituted milk whey by the consortium of bacteria Enterococcus sp. and Veillonella sp.. Daily and along with the supply of solid feeds, 2 L of the compound containing propionic acid were intrainfused in the rumen. There was no RPA × FCR interaction for the intake of nutrients, except for total digestible nutrients (TDN). The organic matter (OM), crude protein (CP), ether extract (EE), neutral detergent fiber (NDF) and TDN intakes were influenced by the FCR. There was no RPA × FCR interaction on the total digestibility of DM, OM, CP, EE, NDF and TC. However, the digestibility of DM, OM, EE and CT were influenced by the FCR. There was no RPA × FCR interaction for the mean N-NH3 concentration and pH of the rumen fluid; however, RPA provided effect on the pH measured 4 hours after meal. There was no interaction or effect of the main factors on volatile fatty acids concentrations in the rumen fluid, or on glucose levels and serum urea nitrogen.Objetivou-se avaliar o efeito da infusão ruminal de ácido propiônico (APR) associado a dietas em mistura completa com duas relações volumoso:concentrado (RVC), 80:20 e 60:40 (% da MS), para novilhos. Foram utilizados quatro novilhos mestiços, Holandês × Zebu, com idade média de 7 meses e 160 kg de peso vivo, distribuídos em delineamento experimental quadrado latino. As dietas foram isoprotéicas e os animais alimentados à vontade, na forma de ração em mistura completa. O ácido propiônico foi produzido por fermentação do soro de leite reconstituído, pelo consórcio das bactérias Enterococcus sp. e Veillonella sp. Diariamente e junto ao fornecimento dos alimentos sólidos, infundiram-se no rúmen 2 L do composto contendo ácido propiônico. Não houve interação APR × RVC para os consumos de nutrientes, exceto nutrientes digestíveis totais (NDT). Os consumos de matéria orgânica (MO), proteína bruta (PB), extrato etéreo (EE), fibra em detergente neutro (FDN) e NDT foram influenciados pela relação volumoso:concentrado utilizada. Não houve interação APR × RVC para as digestibilidades to
ISSN:1516-3598
1806-9290
DOI:10.1590/S1516-35982009000500023