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Grazing Behavior of Ruminants and Daily Performance from Warm-Season Grasses

^a USDA-ARS, Dep. of Crop Science, and Dep. of Animal Science, North Carolina State Univ., Raleigh, NC 27695
^b Dep. of Agronomy, Univ. of Florida, Gainesville, FL 32611

View larger version (32K): [in a new window]   Fig. 1. Components of ingestive behavior, including prehension and mastication, that mediate canopy characteristics and short-term intake rate (after Ungar, 1998).

View larger version (18K): [in a new window]   Fig. 2. The process to achieve the goal of estimating daily dry matter (DM) intake from short-term intake rate and ultimately animal daily performance.

View larger version (27K): [in a new window]   Fig. 3. Relationships between masticate dry matter (DM) and steer average daily gain for continuously stocked coastal bermudagrass (CB), switchgrass (SG), rotationally stocked flaccidgrass (FGR), flaccidgrass (FG), and tall fescue (TF) when expressed as (A) the proportion in large, medium, and small particle classes; (B) in vitro DM disappearance (IVDMD) of each particle size class, and (C) digestible DM concentration of each particle size class (proportion of masticate DM in each particle class x the IVDMD concentration of its DM).

View larger version (29K): [in a new window]   Fig. 4. Five grazing situations associated with management-imposed bounds and pasture canopy constraints interacting with animal grazing behavior.