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close this book Grazing and rangeland development for livestock production
close this folder Management of rangelands and other grazing lands of the tropics and subtropics for support of livestock production. Technical Series Bulletin No. 23
close this folder VI. Estimating Feed Requirements of Ruminant Livestock in Tropical and Sub-Tropical Regions.
View the document 1. Feed requirements for cattle.
View the document 2. Feed requirements for sheep and goats
View the document 3. Feed values of edible forage plants.
View the document 4. Relative feed values of growing forage plants on rangeland and pastures, and of mature plants.
View the document 5. Feed value of crop byproducts.
View the document 6. Balancing livestock numbers against total yearly feed supplies.

3. Feed values of edible forage plants.

Nutrient content (and feed value) of forage plants is determined by the content of digestible nutrients, by the protein component, and by the adequacy in supplies of essential mineral elements. Since mineral supplements may be provided separately from forages, it is convenient to use two principal factors in estimating feed value; total digestible nutrients (T.D.N.), and protein content.

In calculating available feed supplies for grazing livestock the following averages may be utilized in converting the yearly production of plant herbage into animal support.

Mature tropical grasses may be assumed to contain about 50% T.D.N., and 4.0 to 6.0 % crude protein.

Perennial range legumes may be assumed to contain about 60 % T.D.N., and 12 to 15% crude protein.

Browse plants generally are more nutritious than grasses, but less so than forage legumes. me forage supply on rangelands tends to be deficient In protein content in the long dry seasons that are typical of rangelands; as well as being chronically inadequate in total amount of edible forage.