Dixon, R.M. and Karda, W. and Hosking, B.J. and Egan, A.R. (2003) Effects of oilseed meals and grainâurea supplements fed infrequently on digestion in sheep 2. Cereal straw diets. Animal Feed Science and Technology, 110 (1-4). pp. 95-110.
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An experiment examined the intake, growth responses and rumen digestion of young sheep fed ad libitum oat or barley straws alone or supplemented with approximately isonitrogenous amounts of barley grain and urea (Bar/N), safflower seed meal (SAF) or linseed meal (LIN) supplements provided at 3 day intervals.
The supplements comprised 15â22% of total dry matter (DM) intake. Sheep offered either of the straws alone consumed 35.0â37.2 g DM/kg liveweight (LW0.75) per day of straw and an estimated 2.03â2.07 MJ metabolizable energy (ME) per day, and lost 85â97 g LW per day. Supplements increased (P<0.05 or <0.001) voluntary intake of straw and of total DM, and the organic matter (OM) digestibility of the entire diet. Each of the supplements increased (P<0.001) the estimated ME intake to a similar extent and changed the rapid LW loss of sheep fed straw alone to approximate LW maintenance.
Rumen ammonia concentrations in sheep fed barley and oat straws alone (12 and 24 mg NH3/l, respectively) were expected to be deficient for microbial activity, but were increased (P<0.001) by provision of the supplements. Digestion of straw in synthetic fibre bags incubated in the rumen was markedly increased (P<0.01 or <0.001) when supplements were provided. Rumen pH was depressed briefly to pH <6.0 by the Bar/N, but not by the LIN or SAF, supplements.
In young sheep fed cereal straws and losing LW rapidly the oilseed meal supplements increased wool growth more than the barley grainâurea supplements, but both types of supplement increased ME intake similarly and were equally effective to reduce the extent of LW loss.
|Corporate Creators:||Animal Science|
|Additional Information:||© Elsevier|
|Keywords:||Sheep; Digestion; Metabolizable energy; Growth; Wool; Three day supplementation.|
|Subjects:||Animal culture > Feeds and feeding. Animal nutrition|
|Deposited On:||07 May 2004|
|Last Modified:||25 Nov 2008 00:00|
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