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Prevention of Parturient Paresis by a Prepartum, Calcium-Deficient Diet¹,^,2

Department of Animal Science, Iowa State University and National Animal Disease Laboratory, Ames IA 50010

ABSTRACT

Parturient paresis was prevented by feeding a calcium-deficient diet composed of corn silage, ground shelled com, a dried molasses product, urea, and monosodium phosphate. The diet was palatable and met energy, protein, and phosphorus requirements but supplied only 8 g of calcium daily per 450 kg body weight. Twelve parturitions of cows fed this diet for about 14 days prepartum were compared to 13 parturitions of similar cows fed control diets. Initially, plasma calcium of the cows fed the calcium-deficient diet decreased, but homeostatic mechanisms returned calcium to normal within 4 days. This sensitized calcium homeostatic mechanism was sufficient to prevent parturient paresis in the 12 cows fed the calcium-deficient diet.

¹ Journal Paper No. J-7688 of the Iowa Agriculture and Home Economics Experiment Station, Ames, IA, Project No. 1910.

² Supported in part by funds provided by Moorman Manufacturing Company, Quincy, IL.

³ Present address: Agway Research Center, RD 2, Tully, New York 13159.

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