In vivo digestibility of cereal-based diets supplemented with sunflower vs. rapeseed meal
2014
Yossifov, M., Institute of Animal Science, Kostinbrod (Bulgaria) | Kozelov, L., Institute of Animal Science, Kostinbrod (Bulgaria)
Two experiments were conducted to investigate effects of rapeseed meal - RSM vs. sunflower meal - SFM as a protein source at cereal-based isonitrigenous - at 16 % CP, iso-caloric at gross energy 18 kcal/kg and net - FUG=1 energy diets for fattening lambs. Four wethers - Gygay breed were used to evaluate the diets apparent total tract digestibility - dry matter - DM, organic matter - OM, crude protein - CP, ether extract - EE, crude fibres - CF, nitrogen free extractives - NFE and ash and coefficients - Cd were used to calculate the diets feeding value. Two diets were used: conrol diet - CD with SFM and experimental diet - ED with RSM. The results indicated that feeding RSM tended to increase Cd OM - p=0.1, Cd CP - p=0.4, Cd EE p=0.5 and Cd NFE p=0.1. The differences were significant at Cd DM p0.05, Cd CF p0.05 and Cd ash p0.001. According to the calculation analysis, diet supplementation with RSM benefits total digestible nutrients - TDN, raised energy values - gross energy, digestible energy and net energy and improved protein feeding values - protein trully digestible in small intestines - PDI and balance of protein in rumen BPR. Therefore, it is concluded that, substitution of SFM with RSM in cerealbased ruminant diets significantly p0.05 increased in vivo diet digestibility, raised - 11 % TDN and improved its energy and protein feeding value.
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