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The Use of Deuterium Oxide for the Prediction of Body Composition in Live Dairy Cattle¹

Department of Dairy Science, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, OH 44691 ^* College of Pharmacy, The Ohio State University, Columbus, OH 43210

Body composition was studied in five animal groups (two 8-week-old calves, two 16-week-old calves, three Holsteins and three Jerseys in late lactation and two groups of cows each having a Holstein and a Jersey in early lactation). Each group was fed a different diet so as to effect wide variations in body composition. Body water volume and kinetics were estimated by deuterium oxide (D₂O) dilution in trials lasting 10–12 days for each animal. The experimental animals were slaughtered at the end of the trials for direct chemical analyses of body components. The following prediction equations were derived from D₂O measurements and direct chemical analyses (slaughter studies) in kilograms except energy, which is in megacalories: TBW = 1.501D^0.898 (s_y·x = 0.285); P = 1.501 (D^0.898 - 2.682T^0.005); protein = 0.147P^1.095 (s_y·x = 0.895); ash = 0.0381P^1.057 (s_y·x = 0.298); fat = 0.00122p^-2.769LW^4.275 (s_y·x = 0.342); energy = fat x 9.226 + protein x 5.926 where TBW = total body water, D = D₂O space in kilograms, T = water turnover (L/day), P = predicted empty body water and LW = liveweight (kilograms). It was concluded that further studies are required, with more animals, to improve and/or verify the utility of the above equations.

KEY WORDS: • deuterium oxide • body composition • live dairy cattle

¹ Salaries and research support provided by State and Federal Funds appropriated to the Ohio Agricultural Research and Development Center, The Ohio State University. Journal Article No. 146-83.

Manuscript received 2 May 1984.