EVALUATION OF PROCESSED COMPLETE RATIONS CONTAINING VARIOUS ROUGHAGES IN GROWING MALE SHEEP
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Date
2010-11
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
ABSTRACT:
Three complete rations (T1, T2 and T3) formulated, using jowar stover, maize stover and sweet sorghum bagasse (SSB) (at 50% level) processed into expander extruded pellets were evaluated in a completely randomized design (CRD) using 3 groups of growing ram lambs, each group comprising of 6 lambs in a growth cum metabolic trial for 120 days. DM intake was significantly (P<0.05) higher in T2 and T3 than T1. The nutrient digestibilities of DM, OM, CP, CF, EE, NFE were significantly (P<0.05) higher in T3 followed by T2 which was in turn higher (P<0.05) than T1. The digestibilities of NDF and cellulose were significantly (P<0.05) higher in T3 and T2 than T1. The ADF digestibility was significantly higher in T2 than T3 which was in turn higher (P<0.05) than T1.There was no significant (P>0.05) difference in hemi cellulose digestibility. All the lambs were on positive nitrogen, calcium and phosphorous balance. Nitrogen and phosphorous balance were comparable, while Ca balance was significantly (P<0.05) higher in T1 than T2.The DCP content of T2 was significantly higher (P<0.05) than T1 and T3. The TDN content of T3 was
significantly (P<0.05) higher than T2 followed by T1. The lambs of T1, T2 and T3 grew with an average daily gain (ADG) of 70.16±9.83, 77.33±4.16 and 81.25±4.98 g, respectively and were statistically comparable. The feed conversion efficiency was also similar among groups and ranged between 9.51±0.69 to 10.15±1.26. Cost of feed/kg was lower for T3 due to the inclusion of SSB. The mean live weight (kg) at slaughter and empty body weight (kg) in different treatment groups were statistically non significant (P>0.05). No significant differences (P>0.05) were observed among the treatment groups for dressing percentage on live weight basis or on empty body weight basis, percentage of edible offals and non edible offals, proportion of different wholesale cuts, lean percent, bone percent and meat: bone ratio. The fat proportion in carcass of ram lambs fed with maize stover based expander extruded pellets (T2) was significantly (P<0.05) higher than lambs fed with T1 or T3. Thus, it can be concluded that sweet sorghum bagasse can be incorporated in the complete rations of sheep at 50 % level by replacing conventional roughages such as jowar stover and maize stover, processed as expander extruder pellets without affecting the performance, nutrient digestibility and carcass characteristics.
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