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Digestibility of Animal Tissue by Muskrats

We examined the potential nutritional benefits derived by muskrats ( Ondatra zibethicus ) that supplement their diet of aquatic plants with animal tissue. Digestibility, energy, and nitrogen-balance trials were conducted with adult muskrats fed each of three diets: 100% shoots of cattails ( Typha latifolia ); 95% shoots of cattails, 2.5% fathead minnows ( Pime-phales promelas ), and 2.5% flesh of muskrats; 85% shoots of cattails, 10% fathead minnows, and 5% flesh of muskrats. Muskrats presented with diets containing meat selectively increased the proportion of animal tissue ingested above that offered in the ration ( P 50% intake of dry matter) with no apparent loss of ability to digest fiber. They further suggest that free-ranging muskrats consuming diets containing only 2–3.5% animal tissue can meet their maintenance requirements of daily nitrogen (1.02 g N/kg0.75 body mass) solely from meat. We conclude that consumption of meat, even at low levels, can be nutritionally beneficial to muskrats in nature.