Food Habits of Deer In The Southern Black Hills As Determined By The Point Technique

Publication Year:
1971
Usage 8
Downloads 5
Abstract Views 3
Repository URL:
https://openprairie.sdstate.edu/etd/216
Author(s):
Schenck, Theron E.
Publisher(s):
South Dakota State University
Tags:
Natural Resources and Conservation
artifact description
White-tailed (Odocoileus virginianus) and mule deer (Odocoileus hemionius) were collected in 1968 and 1969 for a study of food habits. Rumen contents were analyzed by use of the point-analysis technique and weights. This is the first food habits study from the southern Black Hills and is necessary for proper deer management. To evaluate the suitability of the point technique for Black Hills vegetation, an artificial population was constructed from known weights of a forb, (Achillea lanulosa), grass (Oryzopsis asperfoliz), rose (Rosa sp.), kinnikinnick (Arctostaphylos uva-ursi), and ponderosa pine (Pinus ponderosa). Each population was tested with 100-point trails and 200-point trials. Comparisons of point percentages to weight percentages were: forb – 24.3 to 14.8, grass – 26.5 to 25.7, rose – 10.2 to 10.8, kinnikinnick – 24.8 to 29.3, and pine – 16.3 to 18.3 percent. Forb estimates were significantly different (P>0.05) using chi-square analysis. Browse, grasses and forbs were estimated with no significant differences (P>0.05) using chi-square analysis: forbs 0 24.3 to 14.8, grasses – 26.5 to 25.7 and browse 51.3 to 58.4 percent. Twenty stomach samples were separated by hand after point analysis. Estimates of relative composition by hand separation and point for ten major species were: mountain mahogany (Cercocarpus montanus), 15.2 to 13.7; ponderosa pine, 12.3 to 13.9; juniper (Juniperus spp.), 9.6 to 12.8; grasses, 9.4 to 10.3; kinnikinnick, 7.4 to 9.6; snowberry (Symphoricarpos spp.), 5.2 to 7.3; rose, 5.1 to 5.7; Oregon grape (Mahonia repens), 3.9 to 5.5; bedstraw (Calium sp.), 2.5 to 4.7; and old-man’s bead (Usnea sp.), 4.2 to 3.8 percent. Paired-“t” tests showed there was no significant difference (P>0.05) between the estimated relative composition either by hand separation or by points. No difference in estimation of the hand-separated material: forbs, 11.9 to 17.9; grasses, 9.4 to 10.3; and browse, 69.1 to 58.7 percent. Analysis of 52 rumen samples collected in the fall showed kinnikinnick, grasses, Oregon grape, snowberry (Symphoricarpos spp.), and forbs to be important food species. Analysis of 64 rumen samples collected in the winter indicated that poinderosa pine, mountain mahogany, and common juniper (Juniperus communis) were the most important food species. Other winter foods of importance were kinnikinnick, fobs, grasses, snowberry, and Rocky Mountain juniper (Juniperus scopulorum). Point analysis of content in nine rumen collected in the summer showed that alfalfa (Medcago sative), clover (Trifolium pretense), grasses and forbs were the most important foods.