Íslenskar landbúnaðarrannsóknir - 01.03.1977, Blaðsíða 90
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REFERENCES
Aðalsteinsson, Stefán, 1970. Colour inheritance in
Icelandic sheep and relation between colour fer-
tility and fertilization. J. Agric. Res. Icel. 2:
3—135.
Aðalsteinsson, Stefán and Hattgrímsson, Sveinn,
1977. Inherited fertility depression in Icelandic
sheep. J. Agric. Res. Icel. 9, 1: 76—80.
Biegert, K., 1939. Untersuchungen iiber die Zwil-
lingsfrachtigkeit bei dem deutchon veredelten
Landschaft (Wurttemberger) unter besonderes
Beruchsichtigung der Hohenheimer Hamherde.
Z. Tierz. Zucht Biol., 42: 215—258.
Demster, E. R. and Lerner, I. M., 1950. Herita-
bility of threshold characters. Genetics. 35: 212
—236.
Edey, T. N., 1969. Prenatal mortality in sheep.
A review. A.B.A. 37: 173—190.
Edgar, D. G., 1958. The induction of ovulation
and oestrus in ewes during anoestrus. Proc. N.
Z. Soc. Anim. Prod. 18: 97.
Hallgrímsson, Sveinn, 1966. Innvirkning av noen
factorer pá fruktbarhet hos sau (Some faaors
affecting fertility in Icelandic sheep). Thesis
Vollebekk, Norway 1966, 73 pp.
Hattgrímsson, Sveinn, 1973. Starfsemi fjárræktar-
félaganna. Freyr 68: 80—84.
Heape, W., 1899. Agordian, Carvenness and ferti-
lity in sheep. Roy. Agric. Soc. Engl. Ser. 3, 10:
217—248.
Hulet, C. V. and Ercanbrack, S. K., 1962. A ferti-
lity index for rams. Anim. Sci. 21: 489.
Hulet, C. V., Warren, C. F. and Blackwell, L. R.,
1965. Relationship of semen quality and ferti-
lity in the ram on fecundity in the ewe. Reprod.
Fertil. G: 311—315.
Lax, F. and Brown, G. H., 1968. The influence
of maternal handicap, inbreeding and ewes
body weight at 15—16 months of age on re-
production rate in Australian Merinos. Aust. J.
Agric. Res. 19: 442—443.
Morley, F. H. W., 1954. A new unusual faaor in
Australian Merino sheep. Aust. Vet. 30: 237—
240.
Purser, A. F., 1965. Repeatability and heritability
of fertility in hill sheep. Anim. Prod. 7: 75—
82.
Terrill, C. E., 1937. Measurement of reproduaive
capacity as an aid in seleaion of rams of high
fertility. Proc. Am. Soc. Anim. Prod. 1937:
311—316.
Young, S. S. Y., Turner, H. N. and Dolling, C. H.
S., 1963. Selection for fertility in Australian
Merino sheep. Aust. J. Agric. Res. 14: 460—
486.
Webster, W. M., 1952. Infertility in rams, Proc.
N. Z. Soc. Anim. Prod. 11: 62—78.
Wiggins, E. L., Terrill, C. E. and Emik, L. O.,
1953. Relationship between libido, semen
characterisics and fertility in range rams. J.
Anim. Sci. 12: 684—696.