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Effect of Three Pasture Grasses on Yearling Pony Weight Gains and Pasture Carrying Capacity

University of Minnesota,^,3 St. Paul 55108

Abstract

The objective was to determine whether differences previously found in the performance of sheep, but not in cattle, grazing smooth bromegrass, orchard grass or reed canary grass would also occur with growing horses. Yearling ponies gained equally well on the three grasses prior to July 1 but ponies grazing reed canary grass gained significantly less during July and August when alkaloids in the grass increased sharply (.10% alkaloids in May and June and .32% during July and August). No other quality differences (protein, mineral and digestible dry matter) could explain the change in performance of the ponies as the season progressed.

¹ Professor of Animal Science, University of Minnesota.

² Research Agronomist, North Central Region, Agricultural Research Service, U. S. Department of Agriculture and Professor of Agronomy, University of Minnesota.

³ Paper No. 8526 Scientific Journal Series, Minnesota Agricultural Experiment Station, St. Paul in cooperation with the U.S. Department of Agriculture, Agricultural Research Service, North Central Region.