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Reporting Forage Allowance in Grazing Experiments

^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

View larger version (27K): [in a new window]   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.

View larger version (19K): [in a new window]   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).