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<br /> <br /> <br />Pzrcentage composition by weight of the principal species may total as much as: <br />western wheatgrass 30% <br />muttongrass 30'~ <br />needle-and -thread 5% <br />Junegrass 5% <br />Indian ricegrass S% <br />batilebrush squirreltail S% <br />big sagebrush I S% <br />black sagebrush 10'~ <br />antelope bitterbrush S% <br />Utah serviceberry 5% <br />true mountain mahogarry• ~% <br />Douglas rabbitbrush S% <br />others (listed abovzJ l.i% <br />Heavy grazing use can aid the establishment of pinyon and juniper seedlings through <br />reduced competition, exposure of mineral soil, and reduction of fuel to carry fires. This, <br />combined with increasing control of fires, has caused large portions of the site to be taken <br />over by pirryon and juniper, since the coming of livestock. <br />Other species most likely to invade the site or increase from trace amounts if cover <br />deteriorates, are rubber rabbitbrush, snakeweed cheatgrass, Colorado rubberx~eed and <br />several annual forbs. Sagebrush often assumes a dominant position as the ecological <br />condition deteriorates and pinyon and juniper have not taken over. <br />Total Annual Production <br />Favorable years I,SOOPoundsperAcre,Dry <br />Unfavorable 800 " <br />Median years 1, l00 <br />