Íslenskar landbúnaðarrannsóknir - 01.03.1977, Side 44

Íslenskar landbúnaðarrannsóknir - 01.03.1977, Side 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.

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