J. Anim Sci.
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J. Anim Sci. 2008. 86:712-719. doi:10.2527/jas.2007-0193
© 2008 American Society of Animal Science
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ANIMAL NUTRITION

Reducing phosphorus inputs for grazing Holstein steers1

A. M. Brokman*, J. W. Lehmkuhler*,2 and D. J. Undersander{dagger}

* Department of Animal Sciences, University of Wisconsin, Madison 53706 and {dagger} Department of Agronomy, University of Wisconsin, Madison 53706

2 Corresponding author: jwl{at}ansci.wisc.edu

A 2-yr study was conducted to confirm that managed pastures can provide Holstein steers adequate P to meet their daily requirement. Treatments offered were trace mineralized salt with or without additional P. In the first year, 80 Holstein steers (248 kg of BW) were assigned to 4 grazing groups. Treatments were trace mineralized salt only or a 67:33 mixture of trace mineralized salt and dicalcium phosphate. Steers rotationally grazed a cool-season grass/legume mixture for 137 d. Fecal bags were placed on 3 steers from each grazing group (n = 12) over a 4-d period for estimation of forage DMI and forage contribution to daily P intake twice during the grazing season. Analyzed pasture samples contained 3.28 mg of P/g of DM. During the second year, 72 Holstein steers (297 kg of BW) were blocked into 2 BW groups and subsequently assigned to 1 of 4 pasture groups. Steers rotationally grazed the same forage base as the first year for 126 d. Pasture samples contained 3.27 mg of P/g of DM. No significant differences (P > 0.10) were detected for BW, ADG, or free-choice supplemental mineral intake. Forage provided 126% of the recommended NRC P requirement. Thus, supplemental phosphorous was not required for Holstein steers grazing mixed, cool-season, grass/legume pastures.

Key Words: cattle • grazing • Holstein • mineral • phosphorus






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