Íslenskar landbúnaðarrannsóknir - 01.03.1977, Qupperneq 44

42 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR
Chang, T. S. and Rae, A. L., 1972. The genetic
basis of growth, reproduction, and maternal en-
vironment in Romney ewes. II. Genetic covaria-
tion between hogget characters, fertility, and
maternal environment of the ewe. Aust. J. Agric.
Res., 23: 149—165.
Cunningham, E. P. and Gjedrem, T., 1970. Gene-
tic control of the body weight in selection for
higher wool and lamb output. Aaa Agric.
Scand., 20: 194—204.
Dickerson, G. E., 1959. Techniques for research
in quantitive animal genetics. Techniques and
procedures in animal production research.
American Society of Animal Produaion Publi-
cations: 56—105.
Dickerson, G. E. and Glimp, H. A., 1975. Breed
and age effects on lamb production of ewes. J.
Anim. Sci., 40: 397—408.
Eikje, E. D., 1970. Nedarving av produksjonseg-
enskaper hos söyer. Husdyrforsöksmötet, NLH,
1970: 18—20.
Eikje, E. D., 1971. Studies on sheep produaion
records. II. Effect of environmental factors on
fertility, fleece and body weight of ewes. Aaa
Agr. Scand., 21: 64—68.
Eikje, E. D., 1975. Studies on sheep produaion
records. VII. Genetic, phenotypic and environ-
mental parameters for productivity traits of
ewes. Acta Agr. Scand., 25: 242—252.
Forrest, P. A. and Bichard, M., 1974a. Analysis of
production records from a lowland sheep flock.
2. Flock statistics and reproduaive performance.
Anim. Prod., 19: 25—32.
Forrest, P. A. and Bichard, M., 1974b. Analysis of
droduction records from a lowland sheep flock.
3. Phenotypic and genetic parameters for re-
productive performance. Anim. Prod., 33—45.
Gjedrem, T., 1967. Phenotypic and genetic para-
meters for weight of lambs at five ages. Aaa
Agr. Scand., 17: 199—216.
Hallgrímsson, S., 1966. Innvirkning av noen fak-
torer pá fruktbarhet hos sau. Thesis for Lic.
Agric. Degree, Agriculturla University of Nor-
way: 73 pp.
Hannesson, Ketill A. and Sigþórsson, Guðmundur,
1971. Áhrif fjárfjölda, frjósemi, fóðrunar og
vinnu á framlegð sauðfjár. Búfjárræktarráð-
stefna, 1971: 11 pp.
Hanrahan, J. P., 1976. Maternal effects and selec-
tion response with an application to sheep data.
Anim. Prod., 22: 359—369.
Johansson, I. and Hansson, A., 1943. The sex
ratio and multiple births in sheep. Landbruks-
högskl. Annaler, 11: 145-—171.
Jónmundsson, Jón Viðar, 1971. Variasjonsársaker
for haustvekt av lam og muligheter for selek-
sjon. Hovedoppgave NLH: 98 pp.
Jónmundsson, Jón Viðar, 1975a. Meðgöngutími
og vanhöld hjá íslenzku sauðfé. Fjölrit nr. 7,
Bændaskólinn Hvanneyri, Borgarfirði: 15 pp.
Jónmundsson, Jón Viðar, 1975b. Urval fyrir frjó-
semi og þunga lamba. Fjölrit nr. 8, Bænda-
skólinná Hvanneyri, Borgarfirði: 21 pp.
Jónmundsson, Jón Viðar, 1977. A study of data
from the Sheep Recording Associations in Ice-
land. I. Sources of variation in weights of
lambs. Jour. Agric. Res. Icel. 9, 1: 16—30.
Purser, A. F., 1965. Repeatability and heritability
of fertility in Hill sheep. Anim. Prod., 7: 75—
82.
Rendel, J., 1956. Heritability of multiple birth in
sheep. J. Anim. Sci. 15: 193—-201.
Robertson, A., 1959. The sampling variance of
the genetic correlation coefficient. Biometrics,
15: 469—485.
Sharafeldin, M. A., 1960. Faaors affecting litter
size in Texel sheep. Mede. Landbouwhogeschool,
Wageningen, 60, 3: 1—'61.
Shelton, M. and Menzies, J. W., 1968. Genetic
parameters of some performance charaaeristics
of range fine wool ewes. J. Anim. Sci., 27:
1219—1223.
Vakil, D. V., Botkin, M. P. and Roehrkasse, G. P.,
1968. Influence of hereditary and environmen-
tal factors on twinning in sheep. J. Hered., 59:
256—259.
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—
482.