Ársrit Ræktunarfélags Norðurlands - 01.01.1986, Síða 77
18. Gibb, M.J. and T.T. Treacher, 1978. The efTect of herbage allowance
on herbage intake and performance of ewes and their twin lambs
grazing perennial ryegrass. J. Agric. Sci., Camb. 90:139-147.
19. Grétar Einarsson, 1983. Varanlegar rafgirðingar. Freyr 79:696-700.
20. Gunnar Ólafsson, 1981. Næringargildi beitargróðurs. Isl. landbún.
12:127-134.
21. Hardin, G., 1968. The tragedy of the commons. Science 162:1243-
1248.
22. Hart, R.H., 1972. Forage yield. Stocking rate and beef gains on past-
ure. Herbage Abstr. 42:345-353.
23. Hart, R.H., 1978. Stocking rate theory and its application to grazing
on rangeland. Proc. First Internatl. Rangeland Cong., Soc. Range
Manage. 547-550.
24. Hodgson, J., 1976. The influence of grazing pressure and stocking
rate on herbage intake and animal performance. Proc. Symp. Grassld.
Soc. 8:93-103^
25. Hodgson, J., 1979. Nomenclature and definitons in grazing studies.
Grass and forage Sci. 34:11 -18.
26. Ingvi Þorsteinsson og Gunnar Ólafsson, 1965. Efnainnihald og melt-
anleiki nokkurra úthagaplantna. Atvinnudeild Háskólans. Rit land-
búnaðardeildar. A-flokkur. Nr. 1 7, 26 bls.
27. Ingvi Þorsteinsson og Gunnar Ólafsson, 1969. Efnainnihald og melt-
anleiki nokkurra úthagaplantna II. fsl. Landbún. 1:45-63.
28. Laksesvela, B., 1975. Bare en mindre forringelse av beitet om hösten
nok til at lam ikke legger pá seg. Sau og geit. 28:109-111.
29. Langlands, J.P. and G.E. Donald, 1975. The intakes and growth rates
of grazing Border Leicesters and Merino lambs weaned at 21, 49,
and 77 days. Anim. Prod. 21:175-181.
30. McNaughton, S.J., 1979. Grazing as an optimization process: Grass-
ungulate relationships in the Serengerri. American Naturalist
113:691-703.
31. Montgommery, M.J. og B.R. Baumgart, 1965. Regulation and food
intake in ruminants. 1. Pelleted rations varying in energy concentra-
tions. J. Dairy Sci. 48:569-574.
32. Morley, F.H.W., 1978. Animal production studies on grassland. I
Measurement of grassland vegetation and animal production (ritstj.:
L. ’t Mannetje). Bulletin 52. Commonwealth Agricultural Bureaux.
33. Morley, F.H.W., 1981. Management of grazing systems. I „Grazing
animals" (F.H.W. Morley ritstj.) Elsevier Sci Publ. p. 379-400.
34. Ólafur Arnalds, 1987. Jarðvegseyðing. Handrit.
35. Ólafur R. Dýrmundsson, 1978. Könnun á skiptingu sauðfjár og hrossa
milli heimalanda og afrétta. Freyr 74:691-694.
36. Ólafur R. Dýrmundsson og Ólafur Guðmundsson, 1987. Vor- og
haustbeit sauðfjár. Ráðunautafundur B.í. og Rala 1987, 205-213.
79