Use of yeast-fermented cassava roots as a sole source of protein in beef cows
C. Promkot 1  
,   P. Pornanek 1
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Rajamangala University of Technology Isan, Faculty of Natural Resources, Department of Animal Science SkonNakhon Campus, Post Box 47160, Thailand
C. Promkot   

Rajamangala University of Technology Isan, Faculty of Natural Resources, Department of Animal Science SkonNakhon Campus, Post Box 47160, Thailand
Publication date: 2020-09-21
J. Anim. Feed Sci. 2020;29(3):206–214
Four ruminally-cannulated non-pregnant Brahman beef cows (body weight (BW) = 430 kg) were used to study the effects of yeast-fermented cassava roots (YEFECAR) as the sole source of protein on dry matter (DM) intake and nutrient digestibility. Animals were allotted to groups fed YEFECAR at levels: 0, 20, 30, 35% DM, according to a 4 × 4 Latin square design. Cows were fed rice straws (as a roughage) ad libitum; concentrate treatments (1.5% BW per day) were offered twice daily. It was indicated that the use of YEFECAR in a concentrate diet reduced feed intake (P < 0.05) but had no effects on nutrient digestibility, rumen ecology (pH, NH3-N), rumen volatile fatty acid concentration, rumen bacterial population and microbial protein. Accordingly, it can be concluded that the use of YEFECAR as the primary source of protein at 20% DM or higher in concentrate feed can lower the feed intake, which may subsequently affect livestock yield. To ensure optimal utilization of YEFECAR as the main source of protein in ruminant feed further studies on increasing the sulphur content in yeast medium prior to the production of YEFECAR are needed.
We would like to express our sincere gratitude and appreciation to the Faculty of Natural Resources, Rajamangala University of Technology Isan, Sakon Nakhon Campus, Thailand, for providing laboratory animals and research facilities. We are also immensely grateful to the National Research Council of Thailand (NRCT) and Rajamangala University of Technology Isan for their financial support.
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