000812 Dutta T K;Rao S B N;Sahoo P K;Singh N (NO, Central Institute for Research on Goats, Makhdoom, Farah, Mathura-281 122, Email: firstname.lastname@example.org) : Evaluation of arhar (Cajanus cajan) straw based pelleted feeds and prediction of in vitro gas production. Anim Nutr Feed Technol 2007, 7(2), 161-8.
Different ratios of concentrate (C) and grinded Cajanus straw (R) were used to prepare pelleted feeds, namely, T1, (C:R=80:20), T2 (C:R=70:30), T3 (C:R=60:40), T4 (C:R=50:50), T5, (C:R=40:60), T5, (C:R=30:70) arid T7:R= 100:00). The CP, EE, NFE and OM per cent in the substrates gradually decreased as Cajanus straw level increased in the pellets, whereas crude fiber and total ash levels showed the reverse trend. Based on the data of in vitro gas production (4-48h) polynomial regression equations were developed. Total gas production (ml) up to 48 h of incubation was significantly (P>0.01) higher in T7 (187.81±0.59) than other treatments while lowest gas production was recorded in T6 (l24.86±0.68). The trend of methane production at 24 h and 48 h showed that methane percentage gradually enhanced in the in vitro bottles as Cajanus straw level increased in the pellets, but the differences were non-significant among treatment groups. In vitro dry matter degradability (IVDMD%) was highest (P<0.01) in T7 (61.11±0.77) and lowest in T6 (39.60±0.57). Nitrogen degradability (%) followed the similar trend of IVDMD. Addition of Cajanus straw increased pH in some treatments. TVFA (mmol/dl incubation medium) concentration was significantly (P<0.01) higher in T1, T2, T3 and T7 than other treatments. NH3-N (mg/dl incubation medium) was also highest (P<0.01) in T7 and lowest in T6. Acetate and acetate: propionate ratio remained unchanged due to increase of straw, whereas, propionate level reduced significantly (P<0.05). Results showed that in vitro gas production, IVDMD and fermentation products decreased due to increase of Cajanus straw in the feed pellets.
3 tables, 20 ref