Summary
Theoretical and observed diets of free-ranging yearling cattle in an area of reed-dominated vegetation were related to constraints inherent to ruminants (rumination time as reflected in the zone of acceptable crude fibre content of the ration; rumen fill) and in more general terms, to requirements for minerals (Na, Ca, Mg, P), for protein and for metabolisable energy in order to balance the growth rate achieved by experimental animals. Theoretical diets in spring were mainly limited by feeding time; theoretical diets in summer and autumn were mainly limited by rumen capacity. The high proteinto-energy ratio in the forage species caused protein intake to exceed the animals' demands. Mineral intake was in excess of requirements except for sodium. Yearling cattle in our study area maximized their energy intake, with feeding time, rumen capacity and crude fibre content of the forage as important constraints.
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References
Agricultural Research Council (ARC) (1980) The nutrient requirements of ruminant live stock. Commonwealth Agricultural Bureaux, London
Arnold GW (1985) Comparison of the time budgets and circadian patterns of maintenance activities in sheep, cattle, horses grouped together. Appl Anim Ethol 13:19–23
Bakker JP (1989) Nature Management by Grazing and Cutting. Kluwer Academic Publishers, Dordrecht
Belovsky GE (1978) Diet optimization in a generalist herbivore: the moose. Theor Pop Biol 14:105–134
Belovsky GE (1984a) Snowshoe hare optimal foraging and its implications for population dynamics. Theor Pop Biol 25:235–264
Belovsky GE (1984b) Summer diet optimization by beaver. Am Midl Nat 111:209–222
Belovsky GE (1986) Optimal foraging and community structure: implications for a guild of generalist grassland herbivores. Oecologia 70:35–52
Bokdam J, Gleichman JM (1988) The effect of cattle grazing on the development of Calluna vulgaris and Deschampsia flexuosa. Report LU-NB-M251, Wageningen University
Cordova FJ, Wallace JD, Pieper RD (1978) Forage intake by grazing livestock: a review. J Range Manage 31:430–439
De Leeuw J, Bakker JP (1986) Sheep grazing with different foraging efficiences in a dutch mixed grassland. J Appl Ecol 23:781–793
Hixon MA (1982) Energy maximizers and time minimizers: theory and reality. Am Nat 119:596–599
Hobbs NT, Bakker DL, Gill RB (1983) Comparative nutritional ecology of montane ungulates during winter. J Wildl Manage 47:1–16
Karasov WH (1985) Nutrient constraints in the feeding ecology of an omnivore in a seasonal environment. Oecologia 66:280–290
Prins HHT (1987) The Buffalo of Manyara, The Individual in the Context of Herd Life in a Seasonal Environment of East Africa. Ph.D.thesis, University of Groningen
Pyke GH, Pulliam HR, Charnov EL (1977) Optimal foraging: a selective review of theory and tests. Quart Rev Biol 55:137–154
Schoener TW (1971) Theory of feeding strategies. Ann Rev Ecol Syst 2:369–403
Van Deursen EJM, Drost HJ (1990) Defoliation and treading by cattle of reed Phragmites australis. J Appl Ecol 27:284–279
Van Soest PJ (1965) Symposium on factors influencing the voluntary intake of herbage by ruminants: voluntary intake in relation to chemical composition and digestibility. J Anim Sci 24:834–843
Van Soest PJ (1982) Nutritional Ecology of the Ruminant. O & B Books, Oregon
Van Wijngaarden W (1985) Elephants-trees-grass-grazers; relationship between climate, soils, vegetation and large herbivores in a semi-arid savanna ecosystem (Tsavo, Kenya). Ph.D.thesis University of Wageningen ITC Publication 4, Enschede
Verlinden C, Wiley RH (1989) The constraints of digestive rate: an alternative model of diet selection. Evol Ecol 3:264–273
Vulink JT, Drost HJ (in press) Seasonal nutritional characteristics of cattle food plants in the nature reserve Oostvaardersplassen. Neth J Agr Sci
Welch JG (1982) Rumination, particle size and passage from the rumen. J Anim Sci 54:885–894
Welch JG, Smith AM (1969) Effect of varying amounts of forage intake on rumination. J Anim Sci 28:827–830
Welch JG, Smith AM (1970) Forage quality and rumination time in cattle. J Dairy Sci 53:797–800
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Vulink, J.T., Drost, H.J. A causal analysis of diet composition in free ranging cattle in reed-dominated vegetation. Oecologia 88, 167–172 (1991). https://doi.org/10.1007/BF00320807
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DOI: https://doi.org/10.1007/BF00320807