Digestive responses of wapiti Cervus elaphus canadensis to seasonal forages

• Autorzy: Jiang Z. , Hudson R.J.
• Języki publikacji: EN

Abstrakty

EN

We tested the hypothesis that seasonal differences in passage rate and digestibility of native forage in wapiti Cervus elaphus canadensis Erxleben, 1777 were due to seasonal appetence and digestive adaptation as well as plant phenology and compo­sition. To this end, we compared digestive characteristics of seasonal pasture with those of a standard alfalfa-barley pellet fed to wapiti hinds throughout the year. No evidence of seasonal effects independent of forage quality was found. Although dry matter intakes differed 2-3 fold, the digestibility of the standard pelleted diet was not signficantly different in winter (0.68 ± 0.02), spring (0,74 ± 0.01) and summer (0.71 ± 0.01). However, digestibilities of natural forages increased greatly from winter (0.51 ± 0.01), to spring (0.77 ± 0.02), with a gentle decline into autumn (0.65 ± 0.02). Because retention times of pelleted diets were not significantly different among seasons (winter 28 + 1 h, spring 24 ± 2 h, summer 22 ± 1 h), digestive kinetics also seemed to be mainly a function of seasonal composition of native forage rather than specific seasonal adaptation. The mean retention time of winter herbage (41 ± 2 h) was significantly longer than that of spring (28 + 3 h) and summer (25 ± 2 h) forages. Pasture forages were retained longer (51 ± lh) than pellets in winter but not in spring (28 ± 1 h) and summer (27 ± 1 h). Fecal moisture was a good indicator of digesta retention time despite forage type and may provide a simple index of digestive function for field studies.

Słowa kluczowe

EN

wapiti; Cervus elaphus; digestion rate; foraging ecology; digestibility

• Wydawca: -
• Czasopismo: Acta Theriologica
• Rocznik: 1996
• Tom: 41
• Numer: 4
• Opis fizyczny: p.415-423,fig.

Twórcy

autor

Jiang Z.

• Chinese Academy of Science, Zhongguancun, Beijing 100080, China, e-mail: [e-mail]

autor

Hudson R.J.

Bibliografia

• Abacus Concepts. 1989. Super ANOVA. Abacus Concepts Inc., Berkeley, CA: 1-466.
• Baker D. L. and Hobbs N. T. 1987. Strategies of digestion; digestive strategy and retention time of forage diets in montane ungulates. Canandian Journal of Zoology 65: 1978-1984.
• Cederlund G. and Nystrom A. 1981. Seasonal differences between moose and roe deer in ability to digest browse. Holarctic Ecology 4: 59-65.
• Domingue B. M., Dellow D. W., Wilson P. R. and Barry T. N. 1991. Comparative digestion in deer, goats, and sheep. New Zealand Journal of Agricultural Research 34: 45-53.
• Domingue B. M., Dellow D. W., Wilson P. R. and Barry T. N. 1992. Effects of subcutaneous melatonin implants during long daylength on voluntary feed intake, rumen capacity and heart rate of red deer (Cervus elaphus} fed on a forage diet. British Journal of Nutrition 68: 77-88.
• Fenton T. W. and Fenton M. 1979. An improved procedure for the determination of chromic oxide in feed and feces. Canadian Journal of Animal Science 59: 631-634.
• Gates C. C. and Hudson R, J. 1981. Habitat selection by wapiti in a boreal forest enclosure. Naturaliste Canadien 108: 153-166.
• Gordon I. J. and Illius A, W, 1994. The functional significance of the browser-grazer dichotomy in African ruminants. Oecologia 98: 167-175.
• Hobbs N. T. 1987. Fecal indices to dietary quality: a critique. Journal of Wildlife Management 51: 317-320.
• Hofmann R. R. 1989. Evolutionary steps of ecophysiological adaptation and diversification of ruminants: a comparative view of their digestive system. Oecologia 78: 443-457.
• Holleman D. F. and White R. G. 1989. Determination of digesta fill and passage rate from non absorbed particulate phase markers using the single dosing method. Canadian Journal of Zoology 67: 488-494.
• Jiang Z. 1993. Ecological and morphophysiologicaf constraints on foraging by wapiti (Cervus elaphus). Ph D dissertation, University of Alberta, Edmonton, Canada: 1-114.
• Jiang Z. and Hudson R. J. 1992. Estimating forage intake and energy requirement of free-ranging wapiti {Cervus elaphus), Canadian Journal of Zoology 70: 675-679.
• Jiang Z. and Hudson R. J. 1993a. Optima! gazing of wapiti (Cervus elaphus) on grassland: patch and feeding station departure rules, Evolutionary Ecology 7: 488-498.
• Jiang Z. and Hudson R. J. 1993b. Foraging postures of wapiti (Cervus elaphus). Applied Animal Behavior Science 36: 275-287.
• Jiang Z. and Hudson R. J, 1994a. Bite characteristics of wapiti (Cervus elaphus) in seasonal Bromus-Poa swards. Journal of Range Management 47: 121-126,
• Jiang Z, and Hudson R. J. 1994b. Seasonal energy requirements in wapiti (Cervus elaphus) for maintenance and gain. Canadian Journal of Animal Science 74: 97-102.
• Kay R. N. B. 1987. Comparative studies of food propulsion in ruminants. [In: Physiological aind pharmacological aspects of the reticulorumen. L. A. Ooms, A. D. Degryse and R. Marsboom. ed.s}, Martinus Nijhoff Publishers, Dordrecht: 159-173.
• Kay R. N. B. 1989. Adaptation of the ruminant digestive tract to diet. Acta Veterinaria Scandar.avica 86 (Suppl.): 196-203.
• Kay R. N. B, 1993. Digestion in ruminants at pasture. Proceedings to VII World Conference on Animal Production 7(1): 461-474
• Lechner-Doll M., Rutagwenda T., Schwartz H. J., Schultka W. and Engelhardt W. V. 1990. Seasonal changes of ingesta mean retention time and forestomch fluid volume in indigenous camels, cattle, sheep and goats grazing a thornbush savannah pasture in Kenya. Journal of Agricultural Science 115; 409-420.
• Leslie D. M. and Starkey E. E. 1987. Fecal indices to dietary quality: a reply. Journal of Wildlife Management 51: 321-325.
• Milne J. A., MacRae J. C., Spence A. M. and Wilson S. 1978. A comparison of the voluntary intake and digestion of a range of forages at different times of the year by the sheep and the red deer. British Journal of Nutrition 40: 347-357.
• Renecker L. A. and Hudson R. J. 1990. Digestive kinetics of moose (Alces dices), wapiti (Cervus elaphus) and cattle. Animal Production 50: 51-61.
• Robbins C. T,, Spalinger D. E. and van Hoven W. 1995. Adaptation of ruminants to browse and grass diets: Are anatomical-based browser-grazer interpretations valid? Oecologia 103: 208-213.
• Sibbald A. M. and Milne J. A. 1993. Physical characteristics of the alimentary tract in relation to seasonal changes in voluntary food intake by the red deer (Cervus elaphus). Journal of Agri­cultural Science (Cambridge) 120: 99-102.
• Soest P. J., van 1982. Nutritional ecology of the ruminant. O & B, Corvallis, Oregon: 1-230.
• Soest P. J,, van, Sniffen C. J. and Allen M, S, 1988, Rumen dynamics. [In: Aspects of digestive physiology in ruminants. A. Dobson and M. J. Dobson, eds]. Comstock Publishing Associates, Ithaca: 21-42.
• Spalinger D. E., Robbins C. T. and Hanley T. A. 1993. Adaptive rumen function in elk (Cervus ela­phus nelsoni) and mule deer (Odocoileus hemionus hemionus). Canadian Journal of Zoology 71: 601-610.
• Uden P., Colluci P. E. and van Soest P. J. 1980. Investigation of chromium, cerium and cobalt as markers in digesta. Journal of Science of Food and Agriculture 31: 625-632.
• Warner A. C. I. 1981. Rate of passage of digesta through the gut of mammals and birds. Nutrition Abstracts and Reviews 55: 789-820.
• Westra R. and Hudson R. J, 1981. Digestive function of wapiti calves. Journal of Wildlife Management 45: 148-155.