Abstract
The objective of this study was to evaluate the effect of a polyclonal antibody preparation (PAP) against specific ruminal bacteria on the in situ degradability of dry-grounded maize grain (DMG), high moisture maize silage (HMMS) starch and citrus pulp (CiPu) pectin. Nine ruminally cannulated cows were used in a 3 x 3 Latin square design, replicated three times in a factorial arrangement of treatments of two rumen modifiers represented by monensin and PAP plus a control group, and the three energy sources (DMG, HMMS and CiPu). Each period had 21 days, where 16 were used for adaptation to treatment and five for data collection. The group treated with PAP showed an effect on the soluble fraction (“a”) of DMG starch, decreasing it by respectively 45.3% and 45.4% compared to the CON and MON groups. No effect of PAP was observed for any in situ degradability parameters of starch from HMMS or pectin of CiPu. It was concluded that the polyclonal antibody preparation had limited effect on the in situ degradability of the tested energy sources. Keywords : In sacco degradability, ionophores, polyclonal antibody preparation, ruminal digestion
Highlights
The use of ionophores for ruminal fermentation modulation has been employed with great success for better utilization of diets
The objective of this study was to evaluate the in situ degradation of the dry matter and starch from dry-grounded maize grain (DMG), high moisture maize silage (HMMS) and pectin from citrus pulp (CiPu), as influenced by a polyclonal antibody preparation against specific rumen bacteria in cows fed a high concentrate diet
The results of the influence of polyclonal antibody on the in situ degradability parameters of starch from DMG and HMMS and pectin from CiPu are presented on Tables 2, 3 and 4, respectively
Summary
The use of ionophores for ruminal fermentation modulation has been employed with great success for better utilization of diets. The possible health effects of the use of these additives are a cause for concern and new methods of ruminal fermentation manipulation are beginning to be tested. The European Community, a major importer of meat from Brazil, by Regulation (EC) 1831/2003 (Europe, 2003), banned the use of antibiotics and coccidiostats as feed additives for cattle. This regulation reinforces the need of new feed additive development. The bacteria species are Streptococcus bovis, Fusobacterium necrophorum, Clostridium aminophilum, Peptostreptococcus anacrobius and Clostridium sticklandii
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