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Ruminal Fermentation and Bacterial Protein Synthesis of Whole Cottonseed Coated with Combinations of Gelatinized Corn Starch and Urea

J. K. Bernard^*, J. W. West^*, D. S. Trammell^*, A. H. Parks and T. C. Wedegaertner

^* Department of Animal and Dairy Science, University of Georgia, Tifton 31793-0748
Department of Large Animal Medicine, University of Georgia, Athens 30602-7385
Cotton Incorporated, Cary, NC 27513

Corresponding author: J. K. Bernard; e-mail: jbernard{at}tifton.cpes.peachnet.edu.

Four ruminally and duodenally cannulated Jersey cows were used in a 4 x 5 incomplete Latin square study to determine the effects of including urea in the gelatinized corn starch coating applied to whole cottonseed (WCS) on ruminal fermentation, fiber digestion, and bacterial protein synthesis. Treatments included uncoated WCS (control) and four coated WCS treatments. The coatings provided two concentrations each of gelatinized corn starch (2.5 [2S] or 5% [5S]) and feed grade urea (0.25 [2U] or 0.5% [5U]). Treated WCS comprised 15% of the ration dry matter that was fed as a total mixed ration once daily. Ruminal pH and molar proportions of isobutyrate was higher and NH₃-N concentrations lower for control compared with coated WCS. Molar proportions of propionate tended to be higher and valerate was lower with 2S compared with 5S. Molar proportions of acetate tended to be lower, whereas butyrate was higher for 5U than 2U. Nutrient intake was lower for WCS coated with 5S5U compared with 2S5U. Ruminal NDF digestibility of NDF tended to be higher with 5U compared with 2U, but no differences were observed in ruminal or total tract apparent digestibility of nutrients. No differences were observed in the flow of total N or bacterial N to the duodenum, but the flow of nonbacterial N tended to be higher for WCS coated with 5U. Coating WCS appears to slightly alter ruminal metabolism while providing similar amounts of N flowing to the duodenum without altering fiber digestion.

Key Words: cottonseed • starch • ruminal fermentation • bacterial protein synthesis

Abbreviation key: 2S = 2.5% starch, 5S = 5.0% starch, 2U = 0.25% urea, 5U = 0.5% urea, WCS = whole cottonseed

This article has been cited by other articles:

				K. M. Cooke, J. K. Bernard, and J. W. West Performance of Lactating Dairy Cows Fed Whole Cottonseed Coated with Gelatinized Starch plus Urea or Yeast Culture J Dairy Sci, January 1, 2007; 90(1): 360 - 364. [Abstract] [Full Text] [PDF]