Authors : M.H. Palizdar, H. Sadeghipanah, H. Amanlou, H.R. Mohammadian-Tabrizi and A. Mirhadi
Abstract: Researchers utilized in vitro rumen gas production technique to evaluate soybean meal coated with different types and levels of hydrogenated fatty acids for total gas production, organic matter digestibility. The aim of this study was also to investigate the digestion kinetic of Soybean Meal (SBM) protected with different types: Hydrogenated Tallow (HT); Hydrogenated Palm oil (HP) and levels (0, 200, 400, 600 and 800 g kg-1) of fatty acids to decrease rumen digestibility of organic matter and Gas Production (GP). Approximately, 200 mg (DM basis) of sample is weighed and inserted in glass syringes then mixed with the inoculum and artificial saliva which the initial volume of the syringes reached to approximately 30 mL and incubated at 39°C in a ventilated oven. GP was recorded after 0, 2, 4, 6, 8, 12, 24, 48, 72 and 96 h. There were differences among fat coated treatments and SBM in total GP at 6, 8, 12, 24 and 48 h of in vitro incubation and the treatments differed (p<0.01) in rate of and potential, gas production. The result of the present study showed that experimental fats which mixed by soybean meal to protect it from microbial fermentation, reduced in vitro digestibility of organic matter and GP during the time of incubation. In compare to HT, coating soybean meal with HP resulted in significant reduced GP (p<0.01). Furthermore, the values of b and a+b reduced significantly since, soybean meal coated with these two types of fat (p<0.01). It seems that one of the possible strategies to reduce total GP from dairy cows or feedlot cattle is coating some portions of dietary concentrate with supplemental fats in the form of hydrogenated free fatty acids like HT or HP. Accordingly a reduction in the fermentation rate of organic matter and proteins could reduce the total GP as NH3, CO2 and CH4 in the rumen and may provide more protein for absorption in the small intestine.
M.H. Palizdar, H. Sadeghipanah, H. Amanlou, H.R. Mohammadian-Tabrizi and A. Mirhadi, 2012. Effects of Soybean Meal Coated with Fat on in vitro Organic Matter Fermentation and Gas Production. Journal of Animal and Veterinary Advances, 11: 171-180.