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Digestion, rumen fermentation and chewing behaviour of red deer fed fresh chicory and perennial ryegrass

Published online by Cambridge University Press:  27 March 2009

S. O. Hoskin ,
K. J. Stafford  and
T. N. Barry
S. O. Hoskin
Affiliation:
Department of Animal Science
K. J. Stafford
Affiliation:
Department of Veterinary Clinical Sciences, Massey University, Palmerston North, New Zealand
T. N. Barry
Affiliation:
Department of Animal Science
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Summary

Pure chicory (Cichorium intybus) and perennial ryegrass (Lolium perenne) forages were cut and fed fresh at Palmerston North, New Zealand, during March 1993 to castrated male red deer kept indoors in metabolism crates. Chicory contained lower levels of dry matter, higher levels of ash, and had a higher ratio of readily fermentable: structural carbohydrate than perennial ryegrass. Apparent digestibility of organic matter was highest for chicory (0·81 v. 0·72), but cellulose apparent digestibility was highest for perennial ryegrass (0·71 v. 0·59). Relative to perennial ryegrass, the rumen fluid of deer fed chicory contained higher concentrations of protozoa, ammonia and total volatile fatty acids (VFA) but had a lower pH at 15.00 h. Chicory-fed deer had higher rumen VFA molar proportions of n-butyrate and a higher acetate: propionate ratio. Total eating time and chews during feeding/g dry matter intake were similar for deer fed the two forages, but deer fed chicory spent much less time ruminating (33 v. 270 min/day) and had fewer rumination boluses (38 v. 305/day). It was concluded that the low rumination time may indicate rapid disintegration of chicory in the rumen to < 1 mm critical particle size, and that particle breakdown and rumen fractional outflow rate should be measured in future experiments with deer fed on chicory.

Type
Animals
Information
The Journal of Agricultural Science , Volume 124 , Issue 2 , April 1995 , pp. 289 - 295
Copyright
Copyright © Cambridge University Press 1995

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