. Biology of New World Microtus. Rodents; Rodents; Microtus; Voles. Nutrition 793 1 ' 1 1 1 r- ^ M. ochrogaster o M. oeconomus • L. sibiricus. Intake g • g Fig. 1. Relation of growth rate of animals to relative rate of intake of digestible dry matter on an artificial diet. Data for Microtus oeconomus and Lemmus sibiricus are combined because regressions were not significantly different. Regression equa- tions with 95% : Y = ± X - ± {R- = ) for M. ochro- gaster, and Y = ± X - ± (7?- = ) for M. oeconomus and L
. Biology of New World Microtus. Rodents; Rodents; Microtus; Voles. Nutrition 793 1 ' 1 1 1 r- ^ M. ochrogaster o M. oeconomus • L. sibiricus. Intake g • g Fig. 1. Relation of growth rate of animals to relative rate of intake of digestible dry matter on an artificial diet. Data for Microtus oeconomus and Lemmus sibiricus are combined because regressions were not significantly different. Regression equa- tions with 95% : Y = ± X - ± {R- = ) for M. ochro- gaster, and Y = ± X - ± (7?- = ) for M. oeconomus and L. sibiricus. See Lindroth et al. (1984) for methods. related with fiber content (hemicellulose, cellulose, and lignin), and weight gain of voles on grass diets may also be negatively correlated with fiber content (Russo et al., 1981). Nevertheless, intake and weight gain improved when weanling meadow voles ate cereal diets with 18% cellulose (alphacel) compared to the same diets without cellulose. Chemically isolated cellulose (alphacel) is essentially un- digested by voles (Shenk et al., 1970) and the improved performance with alphacel in the diet may simply reflect a need for bulk. Ap- parently 10 to 30% of natural fiber can be digested by voles (Keys and Van Soest, 1970). Most of this digestion is probably done by microbes in the cecum, but cellulolytic bacteria and fermentation products have also been found in the stomach (Kudo et al., 1979; McBee, 1970). Toughness and texture of the diet also are related to the amount and arrangement of fiber, and too much fiber may inhibit intake of forage (Ulyatt, 1973).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tamarin, Robert H; American Society of Mammalogists. [Stillwater, Okla. ] : American Society of Mammalogists ; Shippensburg, Pa. : distribu
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