Combination of soybean meal and hibiscus tiliaceus leaf in the goat diet: Effect on some parameters of protein metabolism

Sixteen ettawah cross bred goats were used to study the effect of waru leaf (hibiscus tiliaceus) sapponin combined with soybean meal protein supplementation on some parameters of protein metabolism. goats had body weight average of 16 kg and aged at 7 months. the experimental diets were: t0 = total mixed ration (0.9% saponin of hibiscus leaf,8% cp,62% tdn),t1 = t0 + 3% soybean meal protein,t2 = t0 + 6% soybean meal protein,and t3 = t0 + 9% soybean meal protein. the treatments were allocated in a completely randomized design. the parameters observed in this study were dry matter (dm) and crude protein (cp) intakes,dm and cp digestibilities,ruminal amonia and vfas concentrations,blood urea level,nitrogen retention,digestible organic matter in rumen (domr),urinary allantoin,and estimated microbial nitrogen (n) synthesis. dm intake,domr,urinary allantoin and estimated microbial n synthesis were not affected significantly (p>0.05) by treatments. cp intake,dm and cp digestibilities,ruminal amonia and vfas concentrations,blood urea level and nitrogen retention increased (p<0.05) with increasing levels of soybean meal protein. balancing energy level should be considered for the dietary protein supplementation in hibiscus tiliaceus leaf contained diet of goat. © 2015 diponegoro university. all rights reserved.