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Utah State University, Logan
Abstract
During the spring and early summer of 1956 and 1957 a study was conducted in central Utah to determine nutritive intakes and livestock gains on seeded foothill ranges.
Four wheatgrasses were studied, crested, intermediate, tall, and pubescent. Pure stands were grazed by both cattle and sheep.
In most cases, total protein, phosphorus, and energy content of the diets decreased as the grasses matured. Lignin and cellulose increased. In general, the digestibility of all constituents decreased.
Sheep and cattle made better gains early in the season than later. Late season gains by cattle were greater on the later maturing intermediate and tall wheatgrasses than on earlier maturing crested and pubescent wheatgrasses. Intermediate and tall wheatgrasses also gave best season-long cattle gains. Intermediate wheatgrass gave better gains throughout the grazing season for both ewes and lambs than did tall or crested wheatgrass.
It was concluded that cattle make better use of wheatgrasses than do sheep since lactating cows generally held their body weight or gained throughout spring and early summer, whereas ewes, except those grazing intermediate wheatgrass, lost weight throughout the season. Reductions in lamb and calf gains were less with increasing forage maturity than were reductions in gains of their mothers. Gains of calves and lambs were more nearly the same on different grass species than were gains of the mothers.
1 This species was a commercial purchase and contained both fairway and standard crested wheatgrass.
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