The effect of condensed tannins and polythelene glycol on voluntary intake, nutrient digestibility, nitrogen retention and energy partitioning in sheep
1996
Strydom, P.J. (Agriculture Laboratory, Windhoek (Namibia)) | Smith, W.A. (University of Stellenbosch, Stellenbosch (South Africa). Department of Animal Science)
The effect of condensed tannins on voluntary intake, nutrient digestibility, nitrogen retention and energy partitioning was determined in 20 South African Mutton Merino wethers fed oaten hay treated with O; 2; 4 and 6 percent wattle extract containing condensed tannins. The conclusion to this experiment is that addition of 2 percent wattle extract, containing 1,64 percent condensed tannin, probably had a beneficial effect on nutrient digestibility, whereas 6 percent wattle extract , containing 4,45 percent condensed tannin, could adversely affect voluntary intake, protein digestibility, nitrogen retention and metabilizable energy. In the second experiment, 20 wethers were used to evaluate 0; 6; 12 and 24 g polythelene glycol supplementation per day, while receiving a basal diet of oaten hay treated with 5 percent wattle extract. The conclusion to the second experiment is that nitrogen balance and retention and the metabolizable energy content of the diet was significantly increased by polyethelene glycol supplementation when wethers were fed oaten hay treated with 5 percent wattle extract containing 3-5 percent condensed tannins
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