EFFECT OF SUPPLEMENTATION OF DISTILLERS DRIED GRAIN WITH SOLUBLES (DDGS) TO STRAW BASED DIET ON PERFORMANCE AND NUTRIENT UTILIZATION IN NATIVE SHEEP
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Date
2017-11
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
ABSTRACT :
A growth study was conducted in growing Nellore ram lambs to investigate the effect of supplementation of different levels of distillers dried grain with solubles (DDGS) to sorghum stover based diet on performance and nutrient utilization, microbial protein synthesis and carcass characteristics. The growth trial for 90 days was conducted using twenty four growing Nellore ram lambs, which were randomly allotted to the four experimental diets with different levels of DDGS supplementation to sorghum stover. The level of DDGS supplementation to straw based diet was 1, 1.5 and 2% of the animal body weight in D2, D3 and D4 experimental diets, respectively and compared with conventional concentrate mixture supplementation at 2% of body weight (D1). The dry matter (DM), organic matter (OM), crude protein (CP), ether extract (EE), crude fibre (CF), nitrogen free extract (NFE), total ash, neutral detergent fibre (NDF), acid detergent fibre (ADF), hemicellulose, cellulose and lignin content of DDGS was 89.5, 94.5, 32.3, 11.2, 7.85, 43.1, 5.54, 44.7, 19.1, 25.6, 15.9 and 2.90 percent, respectively.
There was progressive and significant (P<0.01) increase in average daily gain (ADG) in D3 and D4 fed groups compared to D1 group. No significant difference was observed in total feed intake among the four experimental diets. Significant (P<0.01) decrease in FCR was observed in D3 and D4 fed groups. The cost (Rs.) per kg live weight gain in lambs was significantly (P<0.01) lower in D2 and significantly (P<0.01) higher in D1 (control) diet. However, profit/animal was higher by 22.3 and 24.2 percent in D3 and D4 fed lambs compared to D2 fed lambs.
The daily average total dry matter intake (DMI) expressed as kg/d during the metabolism trail was not significantly different among four experimental diets. Digestibility of DM, OM, CP and NFE was either significantly (P<0.01) or non-significantly lower in D2 fed group than D1, D3 and D4 fed groups. Whereas EE digestibility was significantly (P<0.01) lower in D1 fed group compared to D3 and D4 fed groups. Digestibility of CF, NDF, ADF, hemicellulose and cellulose was not significantly different among four experimental diets. The CP (%), DCP (%), TDN (%), DE (MJ/kg DM) and ME (MJ/kg DM) content of the D4 diet was significantly (P<0.01) highest among all the experimental diets followed by D3, D2 and D1 diets. CP intake (g/d or g/kg w0.75) was significantly (P<0.01) higher in D4 fed groups than D2 and D1 fed groups. ME intake (MJ/d) was not significantly (P>0.05) different among the experimental groups but approached significance closely in D4 and D3 compared to D1 and D2 fed groups. Whereas, ME intake (MJ/kg w0.75) was significantly (P<0.01) higher in lambs fed D4 diet than lambs fed D1 and D2 diet. CP intake (g/d) and ME intake (MJ/d or MJ/kg w0.75) were not significantly different between D3 and D4 fed groups. The N intake and absorbed (g/d) were significantly (P<0.01) higher in D4 fed group among four experimental diets fed groups but significantly (P<0.01) higher nitrogen balance was observed in lambs fed D3 and D4 diets than those fed D1 and D2. Urinary excretion of purine derivatives, purines absorbed (mmol/d) and microbial protein synthesis (g/d) were significantly (P<0.01) higher in lambs fed D4 diet compared to D1 and D2 fed lambs. The values were not significantly different between D3 and D4 fed groups.
The pre-slaughter and empty body weights were significantly (P<0.05) higher in D4 fed group than D1 fed group. Carcass weight was significantly (P<0.05) higher in D4 fed lambs than D1 and D2 fed lambs. No significant difference in pre-slaughter, empty body and carcass weights were observed between lambs fed D3 and D4 diets. There was no significant (P>0.05) difference in dressing percent on pre- slaughter or empty body weight, percent whole sale cuts, yield of visceral organs and proportion of meat, bone and fat in whole carcass and chemical composition of meat among lambs fed different experimental diets. It is concluded that DDGS can be supplemented to low quality roughages at 1.5% of body weight to growing Nellore ram lambs for better growth rate, feed efficiency, cost economics, nitrogen balance, plane of nutrition and carcass characteristics. Further, the results of the present study also indicated that general recommendation of supplementation at particular level of body weight is not valid in sheep. It depends on quality (protein and energy content) of the supplement.1
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