J. Anim Sci.
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J. Anim Sci. 1981. 53:1135-1142.
© 1981 American Society of Animal Science
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Sulfur, Nitrate and Starch Supplementation of Tall Fescue for the Ovine1

B. P. Glenn2,3, and D. G. Ely3

University of Kentucky, Lexington 40546

Abstract

Four wethers (25 kg), fitted with permanent abomasal cannulas, were assigned to a 4 x 4 Latin square experiment designed to compare digestibilities and ruminal N and S metabolism of tall fescue supplemented with S, nitrate N and energy. Dietary treatments were: (F), basal diet of dehydrated Kenhy tall fescue; (F + S), F + .2% elemental S; (F + NO3), F + .8% potassium nitrate, and (F + ST), F + 9% Starch. Total apparent N digestibility was lower (P<.01) in wethers fed F + ST than in those fed F + S or F + NO3. Total S digestibility was highest (P<.001) for wethers consuming F + S. Urinary N excretion was highest (P<.05) and N retention tended to be lower in wethers fed F + NO3. Supplemental S increased (P>.001) S balance, while nitrate tended to reduce it. N components reaching the abomasum did not differ with treatment. Daily abomasal protein S recovery was increased (P<.1) in wethers fed F + S. Abomasal protein S (percentage of protein S intake) was increased (P<.1) with F + S, while nonprotein S (percentage of nonprotein S intake) was decreased (P<.01). There was a trend toward accumulation of abomasal nonprotein S for wethers consuming F + NO3. The ratio of abomasal protein N to protein S was lowest (P<.1) with F + S. Management of forage by fertilization to reduce nonprotein N and increase nonprotein S may increase ruminal utilization of tall fescue.

Footnotes

1 This manuscript (80-5-270) is published with the approval of the Director of the Kentucky Agr. Exp. Sta.

2 Present address: USDA-SEA, Ruminant Nutrition Laboratory, Room 217, Building 200, BARC-East, BeltSville, MD 20705.

3 Dept. of Anim. Sci.






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Copyright © 1981 by the American Society of Animal Science.