Effects of adding a spray-dried polyclonal antibody preparation on ruminal fermentation patterns and digestibility of cows fed high concentrate diets

Abstract

<p>The present study aimed to evaluate the effects of different doses of a spray-dried polyclonal antibody preparation against specific ruminal bacteria on rumen fermentation parameters as well as protozoa counts, <em>in situ</em> degradability of sugarcane NDF and total tract apparent digestibility of total diet in cattle fed high concentrate diets. Eight ruminally cannulated cows were used in a replicated 4x4 Latin square design with four periods of 21d. The treatments were T1: 0.0 g/d of PAP-MV, (control); T2: 1.5 g/d of PAP-MV; T3: 3.0 g/d of PAP-MV; T4: 4.5 g/d of PAP-MV. Sample collection for rumen fermentation parameters was carried out at the last day of each period at 0, 2, 4, 6, 8, 10 and 12 h after morning meal. Independently from sampling time, there was no linear or quadratic effect on rumen pH, total concentration of short chain fatty acids, molar proportion of acetate, propionate and butyrate, ammonia nitrogen or lactate. No treatment effects were detected for protozoa counts, <em>in situ</em> degradability of sugarcane NDF and total tract apparent digestibility of total diet. Thus, it can be concluded that different levels of spray-dried PAP-MV were not sufficient to alter rumen environment.</p

Polyclonal antibodies as a feed additive for cattle adapted or not adapted to highly fermentable carbohydrate diets

“…Similar results were reported by Goad et al (1998), Brown et al (2006 and Fernando et al (2010). Differently from this study, no effect of PAP was reported on DMD by Bastos et al (2012) Marino et al (2011) and Bastos et al (2012). The group of adapted animals had greater tSCFA concentration probably due to the increasing levels of HFC in diets (mean value of 109.24 mM).…”

“…and Titgemeyer 2007). No effect of PAP on NH 3 -N concentration was also reported by Dahlen et al (2003), DiLorenzo et al (2008, Blanch et al (2009), Marino et al (2011 and Bastos et al (2012). Higher counts of Entodinium sp.…”

“…Also, Blanch et al (2009) reported that PAP was effective in the reduction of acidosis risks, as the supplemented group had greater total short-chain fatty acids but higher ruminal pH. Dahlen et al (2003) and Bastos et al (2012) did not observe effects when the additive was supplemented in powder form. However, Barducci et al (2013) studied PAP in powder presentation and reported lower feed efficiency, weight gain and carcass weight in beef cattle when compared to monensin.…”

Anticorpos policlonais em dietas com alta inclusão de concentrado para bovinos confinados

“…Já os estudos publicados mais recentemente (BASTOS et al, 2012;BARDUCCI et al, 2009;SARTI et al, 2009;MILLEN et al, 2009;RONCHESEL et al, 2010;MARIANI et al, 2010;MILLEN et al, 2010) foram realizados com formulações do PAP na forma seca (em forma de pó).…”

“…Ainda, não foram detectados aumentos no pH ruminal quando diferentes doses de PAP foram testadas contra um tratamento controle (BASTOS et al, 2012). No entanto, os dados de comportamento ingestivo mostram algumas similaridades entre PAP e monensina quando estes são fornecidos a bovinos confi nados (MARIANI et al, 2010).…”