Nutritional Articles

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Fecal phosphorus excretion from horses fed typical diets with and without added phytase

Published: 2005-05-12

Brief content of the article
This study was executed for environmental reasons. Phosphorus (P) returned to the environment in land-applied animal manures has potential to pollute soil and water resources. Therefore, the researchers studied if the use of a specific feed ingredients or enzymes (phytase) may favourably alter manure characteristics by increasing P mineralization in the gastrointestinal tract, and thus the proportion of soluble, plant available P in faeces. The authors fed 8 yearling geldings four typical diets (coastal Bermuda grass/ whole oats, alfalfa cubes, textured “sweet feed” formulation or a pelleted concentrate formulation) with and without added phytase to study if the proportion of soluble P could be altered. The authors suggest that their results suggest that typical diets for horses can be expected to differ markedly with respect to quantity and solubility of P returned to the environment in faeces. According to the authors, feed selection represents a viable approach to dietary nutrient management for meeting current and future regulations pertaining to environmental disposal of manure from equine operations. The authors found limited potential of phytase for increasing the proportion of soluble, plant-available P in equine faeces.
Keywords: phosphorus; phytate; phytic acid; phytase; digestion; mineral.

Hainze, M.T.M., Muntifering, R.B., Wood, C.W. McCall, C.A. and Wood, B.H. 2004. Fecal phosphorus excretion from horses fed typical diets with and without added phytase. Anim. Feed Sci. a. Tech. 117: 265-279.

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