Published online 28 March 2005
Published in Crop Sci 45:896-900 (2005)
© 2005 Crop Science Society of America
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Reporting Forage Allowance in Grazing Experiments
Lynn E. Sollenbergera,*,
John E. Mooreb,
Vivien G. Allenc and
Carlos G. S. Pedreirad
a Agronomy Dep., P.O. Box 110500, Univ. of Florida, Gainesville, FL 32611-0500
b 5920 W. 53rd St., Stillwater, OK 74074
c Dep. of Plant & Soil Science, Texas Tech Univ., Lubbock, TX 79409-2122
d Dep. Zootecnia, ESALQ, Universidade de São Paulo, Piracicaba, SP, 13418-900, Brazil. Fla

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Fig. 1. Two perspectives are illustrated that describe the decline in forage mass during a 7-d grazing period on a rotationally stocked pasture. In 1-A, forage mass is assumed to decline daily by the product of one over the number of days in the grazing period (7 in this example) and pregraze forage mass. This is generally an erroneous assumption that is made in some calculations of forage allowance. In 1-B, forage mass declines at a rate that may more nearly represent that observed in practice as forage intake and digestibility decrease during a grazing period.
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Fig. 2. Relationship of average daily gain and forage allowance (kg of forage per kg of animal live weight) for continuously stocked pearl millet [Pennisetum glaucum (L.) R. Br.] pastures. Adapted from McCartor and Rouquette (1977).
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Copyright © 2005 by the Crop Science Society of America.