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Effects of OmniGen Pro on performance and rumen fermentation of Jersey heifers.

Y. Jiang



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Effects of OmniGen Pro on performance and rumen fermentation of Jersey heifers.
Y. Jiang*, M. Garcia, H. A. Roberts, G. A. Blakeney, J. D. Chapman, D. J. McLean. Phibro Animal Health Corporation Teaneck, NJ.

OmniGen Pro (OGPRO; Phibro Animal Health, Teaneck, NJ) is a new OmniGen-family feed additive, developed to maintain the immunological foundation of OmniGen AF while improving rumen functionality and nutrient utilization. This study examined the effects of OGPRO on rumen fermentation of dairy heifers. Five ruminally cannulated Jersey heifers (275 kg BW) were included in a crossover design with 2 periods of 30 d and 17 washout days between the 2 periods. Heifers were randomly assigned to 1 of 2 dietary treatments Control (no additive) or OGPRO (top-dressed at 4.5 g/45.4 kg BW). A single TMR representing a late lactation diet (14.7% CP, 31% NDF, 21% starch, 1.56 Mcal/kg NEL) was offered ad libitum throughout the experiment. Rumen fluid was collected weekly (7, 14, 21, 28 d, in each period), 4 h after morning feeding to quantify fermentation via VFA, ammonia-N, and pH analyses. Data were analyzed with the GLIMMIX procedure of SAS, with significance declared at P ≤ 0.05 and trend at 0.05 < P ≤ 0.10. Supplementing OGPRO did not affect (P > 0.40) DMI, ADG, or feed efficiency. There were no treatment differences in ruminal pH, propionate molar proportions, branched-chain fatty acids concentrations and molar proportions, nor ammonia-N concentrations. However, feeding OGPRO increased ruminal concentrations of total VFA (134 vs. 117 mM, P = 0.01), acetate (89.5 vs. 77.6 mM, P = 0.003) and butyrate (19.1 vs. 15.3 mM, P < 0.001) and tended to increase the molar proportions of butyrate (14.3 vs. 13.0%, P = 0.06). The benefits of OGPRO on rumen fermentation parameters were evident as early as 7 d, and there were no effects of diet � day. These findings demonstrate that the inclusion of OGPRO in lactating diets improves rumen fermentation, suggesting greater availability of nutrients and potentially better nutrient utilization.

Keywords: OmniGen Pro, lactating diet, rumen fermentation.