English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

The in vitro dry matter digestibility (IVDMD) values of 9 forages were compared using rumen fluid collected from wild whitetailed deer (Odocoileus virginianus), captive white-tailed deer, and a Holstein cow. Five of the 9 forages analyzed displayed significantly different (P<O.O5) IVDMD between wild deer and captive deer inocula and between wild deer and cow inocula. Differences were attributed to the diet differences of the donor animals, which may have influenced the composition of microorganisms within the rumen. In vitro dry matter digestibility of all 5 forages considered together decreased significantly (KO.05) when rumen inocula were stored at various intervals. This study indicates that IVDMD values obtained using inoculum from captive and domestic animals on commercial diets should only be used by researchers to make comparisons of forages, not to predict actual digestibility levels by wild animals. In addition, in vitro samples should be inoculated as soon after collection as possible in order to obtain reliable data. The quantity and quality of available forage is a major factor affecting the quality of rangelands for wildlife. Biologists have attempted to determine the nutritional quality of various forages and to evaluate digestibility by different animals. In order to determine how well selected wildlife species, such as ruminants, can utilize various forages, researchers have conducted digestibility experiments. Traditionally, digestion trials involving the feeding of animals were used. However, researchers encountered problems using this technique including expense, time, and difficulties in obtaining large amounts of forage (Palmer 1976). Because of such problems, in vitro procedures have been developed to estimate the degree of forage digestion by ruminants (Tilley and Terry 1963, Pearson 1970). The advantage of using in vitro procedures is that they are relatively inexpensive and a large number of forage samples can be analyzed at one time using only a small amount of sample. Like conventional digestion methods, however, in vitro digestibility procedures also have their limitations in practice and application. Because it is often impractical to obtain inoculum from the wild ruminant under investigation, researchers have substituted, using inoculum from captive animals of the same species, or of a different species, in an attempt to quantify how well free ranging animals are using various forages (Palmer et al. 1976, Blankenship et al. 1982). However, because the composition of microorganisms within the rumen is dependent on the diet of an animal (Church 1969, Maynard et al. 1979), differences in diets may influence an animal’s ability to digest a forage. Some researchers have documented that the use of inoculum from different ruminant species, on various diets, affected the IVDMD of various forages (Robbins et al. 1975, Horton et al. 1980). Welch et al. (1983) however, found no significant difference in the IVDMD of 25 forages among 6 ruminant species. Conflicting results may have been caused by differences in Authors are graduate students and assistant professor, Department of Fisheries and Wildlife, Michigan State Universit)(, East Lansing 48824. This manuscript is Journal Art& No. 10896 from the Experiment Station. Michigan Agricultural Manuscript accepted January 9, 1984. 466 the chemical composition of test forages or in differences in laboratory procedures. This study investigated the feasbility of using cow and/ or captive white-tailed deer (Odocoileus virginianus) as the inoculum source for estimating in vitro digestion in wild white-tailed deer. In addition, the effect that the time interval between collection of rumen fluid and inoculation of samples has on in vitro dry matter digestibility (IVDMD) levels was also investigated.

Reliability of Captive Deer and Cow in vitro Digestion Values in Predicting Wild Deer Digestion Levels