Genetic Control of Ewe Body Weight in Selection for Higher Wool and Lamb Output

References

• Abplanalp , H. , Ogasawara , F. X. and Asmundson , V. S. 1963 . Influence of selection for bodyweight at different ages of growth of turkeys . British Poultry Science , 4 : 71 – 82 .
   Google Scholar
• Bassett , J. W. , Cartwright , T. C. , Van Horn , J. H. and Willson , F. S. 1967 . Estimates of genetic and phenotypic parameters of weaning traits in range Rambouillet ewes . J. Anim. Sci. , 26 : 254 – 260 .
   Google Scholar
• Battie , A. W. 1961 . Relationships among productive characters of Merino sheep in North-western Queensland. 1. Estimates of phenotypic parameters . Qd. J. Agr. Sci. , 18 : 437 – 445 .
   Google Scholar
• Battie , A. W. 1962 . Relationships among productive characters of Merino sheep in North-western Queensland. 2. Estimates of genetic parameters, with particular reference to selection for wool weight and crimp frequency . Qd. J. Agr. Sci. , 19 : 17 – 26 .
   Google Scholar
• Bichard , M. 1968 . “ Genetic aspects of growth and development in the pig ” . In Growth and Development of Mammals , 309 – 324 . London : Butterworths .
   Google Scholar
• Botkin , M. P. and Stratton , P. O. 1967 . Factors limiting selection effectiveness in small flocks of Columbias and Corriedales . J. Anim. Sci. , 26 : 971 – 975 .
   PubMedGoogle Scholar
• Breirem , K. 1947 . Beregning av f.e. opptatt på beite av sauer . Nordisk Jordbruksforskning , 28 : 159 – 172 .
   Google Scholar
• Coop , I. E. and Hayman , B. I. 1962 . Liveweight-productivity relationships in sheep. II. Effect of liveweight on production and efficiency of production of lamb and wool . J. Agr. Res. , 5 : 265 – 277 .
   Google Scholar
• Cunningham , E. P. 1969 . The relative efficiencies of selection indexes . Acta Agr. Scand. , 19 : 45 – 48 .
   Google Scholar
• Cunningham , E. P. and Broderick , T. 1969 . Genetic and environmental parameters of growth and carcass traits in dual-purpose cattle . Irish J. Agr. Res. , 8 : 397 – 416 .
   Google Scholar
• Cunningham , E. P. , Moen , R. A. and Gjedrem , T. 1970 . The restriction of selection indexes . Biometrics , 26 : 67 – 75 .
   PubMed Web of Science ®Google Scholar
• Dalton , D. C. 1962 . Characters of econimic importance in Welsh Mountain sheep . Anim. Prod. , 4 : 269 – 277 .
   Google Scholar
• Gjedrem , T. 1965 . Effect of some environmental factors on weaning weight of lambs . Meld. Norges Landbrukshogskole , 44 ( 3 ) : 37
   Google Scholar
• Gjedrem , T. 1966 . Selection index for ewes . Acta Agr. Scand. , 16 : 21 – 29 .
   Google Scholar
• Hall , T. H. , Ruttle , J. L. and Sidwell , G. H. 1964 . Some genetic and phenotypic parameters in Navajo crossbred yearling ewes . J. Anim. Sci. , 23 : 485 – 489 .
   Google Scholar
• Hallgrimsson , S. 1966 . Invirkning av noen faktorer på fruktbarhet hos sau 73 Stensiltrykk
   Google Scholar
• Hazel , L. N. 1943 . The genetic basis for constructing selection indexes . Genetics , 28 : 476 – 490 .
   PubMedGoogle Scholar
• Horn , A. . Genetic and environmental improvement-achivements and prospects . Proc. 9th. International Congress of Animal Production . pp. 307 – 313 .
   Google Scholar
• Kempthorne , O. and Nordskog , A. W. 1959 . Restricted selection indices . Biometrics , 15 : 10 – 19 .
   Web of Science ®Google Scholar
• Kennedy , J. P. 1967 . Genetic and phenotypic relationships between fertility and wool production in 2-year-old-Merino sheep . Aust. J. Agr. Res. , 18 : 515 – 522 .
   Google Scholar
• Knothe , A. 1964 . Index of lifetime production in sheep of the Polish Merino breed based on characters measured in performance tests . Anim. Breed. Abstr. , 33 ( 1965 ) : 580
   Google Scholar
• Lodge , G. A. , Elsley , F. W. H. and MacPehrson , R. M. 1966 . The effects of level of feeding of sows during pregnancy. I. Reproductive performance . Anim. Prod. , 8 : 29 – 38 .
   Google Scholar
• More , O'Ferrall G.J. and Vial , V. E. 1962 . Body weight —fleece weight relationships in Irish sheep . Irish. J. Agr. Res. , 1 ( 2 )
   Google Scholar
• Morley , F. H. W. 1951 . Selection for economic characters in Australian Merino sheep. I. Estimates of phenotypic and genetic parameters , Science Bull. no. 73 45 New South Wales Dept. of Agr .
   Google Scholar
• Morley , F. H. W. 1955 . Selection for economic characters in Australian Merino sheep. V. Further estimates of phenotypic and genetic parameters . Aust. J. Agr. Res. , 6 : 77 – 90 .
   Google Scholar
• Nicols , C. W. and Whiteman , J. V. 1966 . Productivity of farm flock ewes in relation to body size . J. Anim. Sci. , 25 : 460
   Google Scholar
• Okada , I. and Hardin , R. T. 1967 . An experimental examination of restricted selection index, using Tribolium Castaneum. I. The results of two-way selection . Genetics , 57 : 227 – 236 .
   PubMedGoogle Scholar
• Osman , A. H. and Bradford , G. E. 1965 . Effects of environment on phenotypic and genetic variation in sheep . J. Anim. Sci. , 24 : 766 – 774 .
   PubMed Web of Science ®Google Scholar
• Pattie , W. A. 1965 . Selection for weaning weight in Merino sheep. 2. Correlated response in other production characters . Aust. J. exp. Agr. Anim. Husb. , 5 : 361 – 368 .
   Google Scholar
• Purser , A. F. 1965 . Repeatability and heritability of fertility in hill sheep . Anim. Prod. , 7 : 75 – 82 .
   Google Scholar
• Purser , A. F. and Roberts , R. C. 1964 . The effect of treatment during first winter on the subsequent performance of Scottish Blackface ewes . Anim. Prod. , 6 : 273 – 284 .
   Google Scholar
• Rae , A. L. 1965 . “ The genetics of the sheep ” . In Advances in genetics , Vol. 8 , 189 – 265 . New York : Academic Press .
   Google Scholar
• Sangolt , G. 1969 . Korreksjonsfaktorar for haustvekt av lam . Meld. Norges Landbrukshogskole , 48 ( 17 ) : 35
   Google Scholar
• Scheinberg , E. , Bell , A. E. and Anderson , V. D. 1967 . Genetic gain in populations of Tribolium Castaneum under unistage tandem selection and restricted selection indices . Genetics , 58 : 69 – 90 .
   Google Scholar
• Schultz , L. H. 1965 . Relationship of rearing rate of dairy heifers to mature performance . J. Dairy Sci. , 52 : 1321 – 1329 .
   Google Scholar
• Shelton , M. and Menzies , J. W. 1968 . Genetic parameters of some performance characteristics of range finewool ewes . J. Anim. Sci. , 27 : 1219 – 1223 .
   Web of Science ®Google Scholar
• Smith , C. 1964 . The use of specialised sire and dam lines in selection for meat production . Anim. Prod. , 6 : 337 – 344 .
   Google Scholar
• Spedding , C. W. R. , Large , R. V. and Walsingham , Jean M. . The importance of the size of the female in sheep . Paper read to E.A.A.P. meetings . Helsinki
   Google Scholar
• Stalinski , Z. and Knothe , A. 1961 . Phenotypic and genetic correlations between some characteristics of Polish Merino sheep from Jedrzuchowice and Melno flocks . Rozniki Nauk Rolniczych , : 255 – 266 . Tom 78-B-2
   Google Scholar
• Tallis , G. M. 1962 . A selection index for optimum genotype . Biometrics , 18 : 120 – 122 .
   Web of Science ®Google Scholar
• St. Taylor , G. S. 1969 . “ Genetic variation in growth and development of cattle ” . In Growth and Development of Mammals , 267 – 291 . London : Butterworths .
   Google Scholar
• Terrill , C. E. and Stoehr , J. A. 1942 . The importance of bodyweight in selection of range ewes . J. Anim. Sci. , 1 : 221 – 228 .
   Google Scholar
• Turner , H. N. 1969 . Genetic improvement of reproduction rate in sheep . Anim. Breed. Abstr. , 37 : 545 – 563 .
   Google Scholar
• Young , S. S. , Turner , H. N. and Dolling , C. H. S. 1963 . Selection for fertility in Australian Merino Sheep . Aust. J. Agr. Res. , 14 : 460 – 482 .
   Google Scholar