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Assessment of using dried vinasse rice to replace soybean meal in lambs diets: In vitro, lambs performance and economic evaluation

El-Zaiat, Hani M., Ré, Diogo D., Patino, Harold O., Sallam, Sobhy M.A.
Small ruminant research 2019 v.173 pp. 1-8
Texel, acetates, adverse effects, ammonium nitrogen, body weight, butyrates, crude protein, diet, digestibility, digestible protein, economic evaluation, energy, feed conversion, feed prices, fermentation, growth performance, in vivo studies, lambs, methane, methane production, propionic acid, regression analysis, rice, soybean meal, vinasse
Effects of replacing soybean meal (SBM) with dried vinasse rice (DVR) as an alternative source of protein were evaluated under in vitro and in vivo conditions. Protein from SBM was partially replaced by DVR protein at the levels of zero (DVR0) control, 250 (DVR250), 500 (DVR500) and 750 g (DVR750) of the original concentration. An in vitro semi-automatic system was employed to evaluate gas production, feed degradability and fermentation profile of diets. The ANOVA and regression coefficients indicated that the DVR effective level was 500 g/kg DM. An in vivo experiment on twelve Texel lambs (BW; 30.48 ± 0.45 kg) kept individually in wooden pens and allotted into randomized complete block design with 6 blocks by 2 treatments as: control (diet without DVR) and DVR (500 g/kg DM) lasted for 60 days, and the subsequent 7 days were assigned for the digestibility trial. Upon increasing dietary DVR, net CH4 production decreased quadratically (P < 0.05). Ruminal NH3-N concentration and total protozoal count decreased linearly (P < 0.05) as DVR levels increased. In vitro microbial protein and propionate proportion (C3) increased quadratically (P = 0.027 and P = 0.034, respectively), while total short chain fatty acids, acetate (C2) butyrate, isobutyrate and C2:C3 ratio decreased quadratically (P = 0.036, P = 0.020, P = 0.029, P = 0.046 and P = 0.042, respectively). Lambs fed 500 g DVR/kg DM showed higher (P < 0.001) daily gain, body weight, feed efficiency and crude protein digestibility compared to control. The DVR diet showed higher (P < 0.05) digestible, metabolizable and net energy than control. DVR500 diet reduced (P < 0.001) feed costs and increased (P < 0.001) the net profit compared to control. The use of DVR provides a promising source of both protein and energy for growing lambs with extra potentials for economic advantages without adverse effects on growth performance.