Abstract
Chavez SAH, Perez GA, Sanchez GE. Tec Pecu Mex. 2000;38(1)19-34. The purpose of the present study was to evaluate the continuous and rotational grazing systems under heavy and moderate grazing intensities. The study was conducted at Rancho Experimental La Campana INIFAP-SARH on a typical dormant midgrass range of Bouteloua- Aristida. Seventy-one Hereford heifers (mean weight 240 kg) were distributed in four goups as follows: Continuous grazing-Moderated (n=11); Continuous grazing-High (n=25); Rotational grazing- Moderated (n=11) and Rotational grazing-High (n=24). Moderate grazing intensities were determined according to the forage availability (60% utilization) at each paddock. Heavy intensities were determined by duplicating the carrying capacity. Botanical composition diets were different (P<0.05) between plants, grazing system-plants, stocking rate-plants, plants-periods and grazing system-stocking rate-plants. Grasses were the main component (85%) on the botanical composition of the diet, followed by forbs (8.8%) and shrubs (5.5%). Croton pottsii and Bouteloua curtipendula had the highest preference indexes. Stocking rates had more impact on diet selection than grazing systems.
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