J. Anim Sci.
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J. Anim Sci. 1980. 50:128-136.
© 1980 American Society of Animal Science
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Mineral Utilization in Sheep Fed Spring Forages of Different Species, Maturity and Nitrogen Fertility1

O. R. Rosero, R. E. Tucker, G. E. Mitchell, Jr. and G. T. Schelling

University of Kentucky, Lexington 40546

Abstract

Orchardgrass (Dactylis glomerata) and Kenhy, a fescue-rye hybrid (Festuca arundinacea crossed with Secale cerale), at two levels of nitrogen fertilization [0 (nonfertilized) and 84 kg/ha (fertilized)] and two stages of maturity [April 23 (early) and June 5 (late) harvests] were fed to 16 wether lambs in two metabolism trials. Magnesium intakes (g/day) based on 1,000 g air dry feed consumption were: 1) orchardgrass 1.90 (early nonfertilized), 1.73 (early fertilized), 1.72 (late nonfertilized), 1.66 (late fertilized); 2) Kenhy 1.99 (early nonfertilized), 1.80 (early fertilized), 2.28 (late nonfertilized) and 2.22 (late fertilized). Magnesium retention was significantly less (P<.01) with early stages of maturity. Fertilization lowered magnesium intake, percentage apparent absorption (P<.01) and magnesium balance (P<.01). There was no significant difference in Mg balance due to forage species. Early stage of maturity of these two forages gave higher (P<.01) nitrogen and lower (P<.01) potassium retentions. There were no significant differences in potassium and nitrogen balances due to forage species or levels of fertilization. Sheep fed orchardgrass had a higher calcium retention than sheep fed Kenhy (P<.01). Chlorophyll content of the forages was measured, but less than 4% of plant magnesium was extracted with the chlorophyll. This binding was not considered an important factor in forage magnesium availability.

Footnotes

1 The investigation reported in this paper (78-5-23) is from a project of the Kentucky Agr. Exp. Sta. and is published with approval of the director.






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Copyright © 1980 by the American Society of Animal Science.