The nutrient status of grazing beef cattle from four selected soil order regions of Florida was examined. Liver, blood, hair and feces samples from 14 heifers and 14 cows, plus forage samples, were collected during two periods of the year from nine ranches located in four different regions. Soil samples were collected during one period. The soil order regions were the Histosol (southeast), Spodosol (southwest), Entisol (central) and Ultisol (northwest). Mean forage P values were higher (P less than .05) in the wet season, while mean hair P levels were higher (P less than .05) during the dry season. Mean forage, plasma, liver and hair Mg values were higher (P less than .05) in the wet season. Plasma vitamin E, liver vitamin A and forage carotene levels were higher (P less than .05) during the wet season. Mean forage P content was deficient (less than .25%) during both seasons and varied from .10% in the dry season to .16% during the wet season. Mean forage Mg (less than .18%) and K (less than .60%) concentrations were deficient in the dry season. Forage protein was deficient (less than 7.0%) in five of seven ranches during the dry season. Extractable soil Ca, exchangeable soil Ca, Mn, Al, H+, soil organic matter and effective cation exchange capacity were higher (P less than .05) in the Histosol region. Extractable soil K was low (60 ppm) in all regions, except the northwest. Forage P was critical (less than .25%) during the dry season in all regions and varied from .08 to .15%, while plasma P was deficient (4.5 mg/100 ml) in animals from the southeast during the dry season only.
An experiment was conducted to determine the trace mineral status of grazing cattle from four selected soil type regions in Florida. Animal tissue, forage and soil samples were collected during the wet (September-October) and dry (February-March) seasons from nine ranches located in four different regions. On the basis of reported critical forage levels, mean forage Co (less than .1 ppm), Zn (less than 30 ppm) and Se (less than .1 ppm) and liver and hair Se (less than .25 ppm), were low during both seasons. Soil Se (less than .50 ppm) and extractable soil Zn (less than 1.5 ppm) were low in all regions except the southeast. Mean forage Se was low in all regions. Of all animals studied in the wet season, 36 and 32% had low liver Cu (less than 75 ppm) and Se (less than .25 ppm) concentrations, respectively. In the dry season, 20 and 39% of the animals had low liver Cu and Se concentrations, respectively. Hair Se was low (less than .25 ppm) in 90% of the samples during the wet season and in 100% during the dry season. During the wet season, forage Zn, Mn, Co and Se were low in 89, 26, 63 and 84% of the samples, respectively, while extractable (double acid) Zn, Mn, Co and total Se were low in 57, 79, 63 and 100% of the soils, respectively. In the dry season, 80, 20, 40 and 80% of forages were low in Zn, Mn, Co and Se, respectively. Of the seven trace minerals studied, Se and Zn are most likely to be deficient, with Co and Cu insufficiency probable in selected areas.
Cette expérience a été menée pour évaluer la composition chimique et l'appétence de A. rhomboideus, légumineuse moins connues qui peut avoir le potentiel d'être incluse dans l'alimentation des ruminants en saison sèche comme supplément de foin de faible qualité. La palatabilité du fourrage d'Adenodolichos rhomboideus (O. Hoffm) Harms a été testée en comparaison de celui de Leucaena leucocephala et de Stylosanthes guianensis. Un foin de graminées (Imperata cylindrica et Setaria palude-fusca) a été utilisé comme fourrage de référence. Cette étude a été menée selon la méthode dite « cafétéria » dont l'indice de palatabilité a été estimé en fonction de fourrage de foin selon la formule P = (Ti/Di)/ (T1/D1). Ti et Di sont les quantités de foin consommées et distribuées respectivement. T1 et D1 sont les quantités de légumineuses consommées et distribuées. Les teneurs moyennes en protéines brutes ont été de 100, 132 et 270g/kg MS respectivement pour Stylosanthes, Adenodolichos et Leucaena. Suivant l'indice de palatabilité, le fourrage de Leucaena a été le plus consommé. Les indices de palatabilité des fourrages de Stylosanthes et d'Adenodolichos ont été statistiquement semblables (p<0,05). Adenodolichos rhomboideus présente une faible palatabilité, mais il contient des teneurs en protéines brutes supérieures à la limite recommandée pour l'entretien des ruminants (80 g/kg MS) et supérieures à celle de S. guianensis.
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