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Unformatted text preview: J. D. Arthington, J. E. Rechcigl, G. P. Yost, L. R. McDowell and M. D. Fanning ,2 in grazing beef cattle Effect of ammonium sulfate fertilization on bahiagrass quality and copper metabolism 2002. 80:2507-2512. J Anim Sci http://jas.fass.org/cgi/content/full/80/10/2507 the World Wide Web at: The online version of this article, along with updated information and services, is located on www.asas.org at University of Florida on April 14, 2008. jas.fass.org Downloaded from Copyright © 2002 American Society of Animal Science. All rights reserved. For personal use only. No other uses without permission. Effect of ammonium sulfate fertilization on bahiagrass quality and copper metabolism in grazing beef cattle 1,2 J. D. Arthington* 3 , J. E. Rechcigl* 4 , G. P. Yost†, L. R. McDowell†, and M. D. Fanning‡ 5 University of Florida, *Range Cattle Research and Education Center, Ona 33865 and †Department of Animal Sciences, Gainesville 32611 and ‡Southwest Florida Research and Education Center, Immokalee 34142 ABSTRACT: To assess the impact of S fertilization on bahiagrass ( Paspalum notatum ) quality and Cu me- tabolism in cattle, two studies were conducted during the summer grazing season (1999 and 2000). Pasture replicates (16.2 ha; n = 2/treatment) received the same fertilizer treatment in each growing season, consisting of 1) 67 kg N/ha from ammonium sulfate (AS), 2) 67 kg N/ha from ammonium nitrate (AN), and 3) control (no fertilizer; C). Forage sampling was conducted at 28-d intervals following fertilization by the collection of whole plants (four samples/pasture) in randomly dis- tributed 1-m 2 grazing exclusion cages and analyzed for CP, in vitro organic matter digestibility, S, P, Ca, K, Mg, Na, Fe, Al, Mn, Cu, and Zn. To determine the effect of fertilizer treatment on liver trace mineral concentra- tions in grazing cattle, random liver tissue samples were collected (n = 12; four/treatment) at the start and end of the study period in 2000. Ammonium sulfate fertilization increased ( P < 0.001) forage S concentra- tion in both years. Plant tissue N concentrations were Key Words: Cattle, Copper, Liver, Paspalum notation, Sulfur 2002 American Society of Animal Science. All rights reserved. J. Anim. Sci. 2002. 80:2507–2512 Introduction The importance of S as a plant nutrient has been has been reviewed previously (Coleman, 1966; Martin and Walker, 1966). Concerns over S deficiency in Florida bahiagrass ( Paspalum notatum ), the predominant for- 1 This research is supported by the Florida Agric. Exp. Stn. and is approved for publication as R-08397. 2 Correspondence: 3401 Experiment Station (phone: 863-735-1314, fax: 863-735-1930; E-mail: [email protected])....
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- Sulfur, Ammonium nitrate, liver cu concentrations