تخمين ناپديد شدن شكمبه اي و قابليت هضم روده اي پروتيين برخي اقلام خوراكي با روش هاي كيسه هاي نايلوني متحرك و 3مرحله اي آنزيمي

Ruminal disappearance and intestinal protein digestibility of various feeds determined by the mobile nylon bag and 3-step procedures

Ruminal disappearance and intestinal protein digestibility of various feeds including forages (alfalfa hay and silage, corn and whole barely silages, and wheat straw), grains (barley and corn), by-products (sugar beet pulp and wheat bran), protein sources (soybean, cottonseed and fish meals) and whole soybean (Sahar and Williams varieties) were evaluated using the in situ mobile nylon bag technique (MNB) and three-step (3ST) in situ/ in vitro enzyme procedure. Total tract protein disappearance of wheat straw was significantly less than the other forages (P<0.05). Entestinal protein digestibility of barely grain determined by MNB and 3ST (0.74 and 0.83, respectively) was significantly (P<0.05) higher than corn grain (0.63 and 0.75, respectively). Mean total tract protein digestibility of soybean meal determined by MNB and 3ST (0.87 and 0.92, respectively) was significantly (P<0.05) higher than cottonseed meal (0.78 and 0.77, respectively) and fish meal (0.80 and 0.81, respectively). Entestinal and total tract protein digestibility of roasted whole soybeans were significantly (P<0.05) higher than non-rosasted seals. The coefficient of determination (r2) for the relationship of intestinal protein digestibility between the mobile nylon bag technique and three-step procedure was 0.94.