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Effects of limited concentrate intake following forage on subsequent performance of lambs consuming concentrate

A. L. Goetsch and G. E. Aiken

Sheep and Goat Research Journal 15:147-153. 2000.

High-forage diets are often consumed ad lib in a growing phase, followed by ad lib intake of concentrate-based diets during finishing. However, visceral organ energy use relative to absorbed energy is greater with ad lib intake of forage-based diets than with limited or ad lib intake of concentrate. Experiments with cattle suggest that forage diets during growing phase elevates energy and nutrient use by visceral organs during the subsequent finishing period. If the length of time or magnitude of such carryover effects is appreciable, a short period of limit-feeding concentrate after growing phase ad lib intake of forage might be of benefit. This could avert or lessen high energy use by visceral organs during finishing due to prior forage consumption, and thereby increase nutrients available to peripheral tissues. Hence, the objective of this experiment was to determine effects of a short period of restricted intake of a concentrate diet following ad lib intake of forage on subsequent performance when consuming concentrate ad lib. Results of the experiment indicate that growing phase ad lib intake of forage may affect subsequent performance with ad lib intake of concentrate differently than restricted intake of concentrate. A period of restricted intake of concentrate following growing phase ad lib intake of forage could offer potential to improve later performance with ad lib intake of concentrate, compared with a shift from ad lib intake of forage to concentrate, and to a level similar to that occurring with change from growing phase restricted intake of concentrate to ad lib intake of concentrate during finishing.


 

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