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Temporal effects on steer performance and nutritive values for eastern gamagrass grazed continuously for different
1ARS, USDA, South Central Family Farm Research Center, Booneville, AR 72927, USA.
Journal of Animal Science
|March 1, 1997
Summary
Eastern gamagrass grazing management impacts steer performance. High stocking rates maximize live weight gain per hectare, but nutritive values decline with increased days on pasture.
Area of Science:
- Agronomy and Animal Science
- Forage Production and Grazing Management
Background:
- Eastern gamagrass (Tripsacum dactyloides) shows promise as a forage crop.
- Effective grazing management strategies are crucial for optimizing its use.
Purpose of the Study:
- To evaluate the impact of different continuous stocking durations on steer performance.
- To assess the changes in nutritive value of eastern gamagrass under varying grazing intensities.
Main Methods:
- A three-year grazing study was conducted with eastern gamagrass.
- Treatments included light, intermediate, and heavy stocking rates with varying durations of continuous stocking.
- Forage nutritive values and steer performance metrics were measured.
Main Results:
- Nutritive values (crude protein, digestibility) declined non-linearly as days on pasture increased.
- Cumulative average daily gain decreased linearly with increased days on pasture.
- Cumulative live weight gain per hectare increased most rapidly under short duration, heavy stocking (SDHS).
Conclusions:
- Eastern gamagrass can support high live weight gain per unit area.
- Utilizing high stocking rates with a targeted grazing height of 30-38 cm is recommended for maximizing gains.
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