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Crude protein and in vitro organic matter dlgestlblllty (IVOMD) were studied in diets of 4 or 5 esophageally flstulated steers grazing pincpaimetto (PP), fresh-water marsh (FM), or transition (T) sites. Crude protein ln summer diets on FM (10.6%) was hlgher (I90.05) than that on PP (7.3%) and T (7.3%). There were no differences among sites for diet crude protein content (7.1%) during winter. There were no differences (J90.05) ln diet IVOMD among 3 range sites in summer (46.8%) or winter (33.7%). Data suggest that diets selected on PP and T sites could meet protein requirements for dry cows in summer hut not winter. Diets from the FM site could meet protein needs of lactating cows in summer, hut in winter crude protein would be deficient for dry cows because of senescence of the major grass, Panicum hemitomon. Energy from the 3 sites in summer would be marginal for maintenance of dry cows, but in winter none of the sites would be adequate without energy supplementation.

Diet Quality of Steers Grazing Three Range Sites in South Florida