Influence of intraruminal infusion of propionic acid and forage to concentrate levels on intake, digestibility and rumen characteristics in young bulls

Revista Brasileira de Zootecnia

Marinaldo Divino Ribeiro²  José Carlos Pereira¹  Augusto César De Queiroz¹  Vitor Pereira Bettero¹  Hilário Cuquetto Mantovani¹  Cássio José Da Silva² 

[1] ,UFV

关键词: bacteria ruminal;    digestibility;    feeding;    milk whey;    organic acids;    ácidos orgânicos;    alimentação;    bactéria ruminal;    digestibilidade;    soro de leite;   

DOI  :  10.1590/S1516-35982009000500023

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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