Efficient use of annual plants Efficient use of annual plants on cattle ranges in the California foothills efficientuseofan870bent Year: 1951 USE OF ANNUAL PLANTS IN CALIFORNIA FOOTHILLS 13 Y//////////////////// '/////BT/////////S Xf$rSSSSSSA '///////MF//////////S Y////////7/////S// Y////////////j JAN. FEB. MAR. APR. MAY JUNE 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 AV6. Figure 6.—Variations in length of time that green forage was adequate on foothill range. reached this height. Cattle often will stop coming in to feed when called. This, along with height of veget
Efficient use of annual plants Efficient use of annual plants on cattle ranges in the California foothills efficientuseofan870bent Year: 1951 USE OF ANNUAL PLANTS IN CALIFORNIA FOOTHILLS 13 Y//////////////////// '/////BT/////////S Xf$rSSSSSSA '///////MF//////////S Y////////7/////S// Y////////////j JAN. FEB. MAR. APR. MAY JUNE 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 AV6. Figure 6.—Variations in length of time that green forage was adequate on foothill range. reached this height. Cattle often will stop coming in to feed when called. This, along with height of vegetation, can be used in deciding when to quit feeding supplements. The period of dependable green forage (fig. 6) extended until approx- imately the date when the crude protein content of the forage eaten by cattle dropped sharply below 9-10 percent. For 1936-40 the final date was estimated from the forage samples collected by Wagnon; for other years it was estimated from observations of plant development. The length of period was judged on conservatively stocked range. Forage preferences of cattle change several times during this period. In late winter cattle continue to graze the different plant species without discrimination wherever they are tall enough to be grazed. All species can still be considered as forage. Most of this forage is provided by the scattered spots of taller plant growth. Such early-growing species as slender oat, ripgut brome, Douglas fiddleneck, and popcorn-flower are taken in considerably quantity. Taller plants of filaree also are grazed. The forage in the early leaf stages is rich in minerals and protein, the crude protein content usually ranging from about 20 to 30 percent (1,3). Cattle start to gain in weight even though the vegetation is still short. When plant growth is accelerated by rising spring temperatures, cattle still graze most species, but the widely available and early maturing subspecies of broadleaf filaree (11) provides the bulk of t
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