Economic values for ewe prolificacy and lamb survival in New Zealand sheep

Livestock Production Science

Volumn 58, Issue 1, 1999, Pages 75-90

  Amer, P R ^a   McEwan, J C ^a   Dodds, K G ^a   Davis, G H ^a  

^a INVERMAY AGRICULTURAL CENTRE   (New Zealand)

Author keywords

Economic value; Major gene; Modelling; Parameterization; Reproduction; Sheep

Indexed keywords

EID: 0032990498     PISSN: 03016226     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0301-6226(98)00192-4     Document Type: Article

References (30)

1. Amer P.R., Fox G.C. Estimation of economic weights in genetic improvement using neoclassical production theory: an alternative to rescaling. Anim. Prod. 54:1992;341-350.
2. Anonymous, 1996. The New Zealand Sheep and Beef Farm Survey 1994-95. NZ Meat and Wool Boards' Economic Service, Publication No. 2109.
3. Burtt, E.S., 1996. Financial Budget Manual 1996. Department of Farm and Horticultural Management, Lincoln University.
4. Dalton D.C., Knight T.W., Johnson D.L. Lamb survival in sheep breeds on New Zealand hill country. N.Z. J. Agric. Res. 23:1980;167-173.
5. Davis G.H., Armstrong J.R., Allison A.J. Ovulation rates and litter sizes of Booroola ewes classified homozygous, heterozygous and non carrier for the Booroola gene and the transfer of the Booroola gene from the Merino into another breed. Proc. of the 2nd World Congr. on Genet. Appl. to Livest. Prod. Pretoria, South Africa. 1984:1984;1721-1724.
6. Davis, G.H., Fogarty, N.M., Nethery, R., 1996. The use of prolific breeds in various countries: Oceania. In: Fahmy M.H. (Ed.), Prolific Sheep. CAB International, Wallingford, pp. 381-397.
7. Davis G.H., Kelly R.W., Hanrahan J.P., Rohloff R.M. Distribution of litter sizes within flocks at different levels of fecundity. Proc. N.Z. Soc. Anim. Prod. 43:1983;25-28.
8. Davis G.H., McEwan J.C., Fennessy P.F., Dodds K.G. Discovery of the Inverdale gene (FecX). Proc. N.Z. Soc. Anim. Prod. 55:1995;289-290.
9. Davis G.H., McEwan J.C., Fennessy P.F., Dodds K.G., McNatty K.P., O W.S. Infertility due to bilateral ovarian hypoplasia in sheep homozygous (FecXI FecXI) for the Inverdale prolificacy gene located on the X chromosome. Biol. Repro. 46:1992;636-640.
10. Davis G.H., McEwan J.C., Howarth M.V., Kelly R.W., Paterson A.T. Reproductive performance of progeny of prolific Romney, Coopworth and Perendale sheep. Proc. N.Z. Soc. Anim. Prod. 47:1987;89-91.
11. Dodds, K.G., Davis, G.H., Elsen, J.M., Isaacs, K.L., Owens, J.L., 1991.The effect of Booroola genotype on some reproductive traits in a Booroola Merino flock. In: Elsen, J.M., Bodin, L., Thimonier, J. (Eds.), Major Genes for Reproduction in Sheep. INRA, Paris, pp. 359-366.
12. Galloway S.M., Hanrahan V., Potts M.P., Hill D.F. Genetic markers in Inverdale (FecX) sheep. Proc. N.Z. Soc. Anim. Prod. 55:1995;307-309.
13. Geenty, K.G. and Rattray, P.V., 1987. The energy requirements of grazing sheep and cattle. In: A.M. Nicol (Eds), Livestock Feeding on Pasture, New Zealand Society of Animal Production, pp. 39-53.
14. Gray A.J., Davis G.H. Commercial performance of sheep carrying the Inverdale gene (FecX). Proc. N.Z. Soc. Anim. Prod. 55:1995;294-295.
15. Hanrahan, J.P., 1979. Genetic and phenotypic aspects of ovulation rate and fecundity in sheep. 21st British Poultry Breeders Roundtable, November 1979, pp. 23.
16. Haughey K.G. Selective breeding for rearing ability as an aid to improving lamb survival. Aust. Vet. J. 60:1983;361-363.
17. Hazel L.N. The genetic basis for constructing selection indexes. Genetics (USA). 28:1943;476-490.
18. Hight G.K., Jury K.E. Lamb mortality in hill country flocks. Proc. N.Z. Soc. Anim. Prod. 29:1969;219-232.
19. Kelly R.W. Reproductive performance of commercial sheep flocks in South Island districts. 1. Flock performance and sources of wastage between joining and tailing. N.Z. J. Agric. Res. 25:1982;175-183.
20. Kelly R.W., Johnstone P.D. Reproductive performance of commercial sheep flocks in South Island districts. 2. Relationships between ovulation rate, liveweight, mating, and lambing performances. N.Z. J. Agric. Res. 25:1982;519-523.
21. Knight T.W., McMillan W.H., Hall D.R.H., Kilgour R., Hockey H.-U.P. Effect of slope of lambing site on lambs slipping and lamb mortality. N.Z. J. Agric. Res. 32:1989;199-206.
22. Maund B.A., Duffell S.J., Winkler C.E. Lamb mortality in relation to prolificacy. Exper. Husb. 36:1980;99-111.
23. McClintock A.E., Cunningham E.P. Selection in dual purpose cattle populations: defining the breeding objective. Anim. Prod. 18:1974;237-247.
24. Meyer H.H., Clarke J.N., Harvey T.G., Malthus I.C. Genetic variation in uterine efficiency and differential responses to increased ovulation rate in sheep. Proc. N.Z. Soc. Anim. Prod. 43:1983;201-204.
25. Montgomery G.W., Crawford A.M., Penty J.M., Dodds K.G., Ede A.J., Henry H.M., Pierson C.A., Lord E.A., Galloway S.M., Schmack A.E., Sise J.A., Swarbrick P.A., Hanrahan V., Buchanan F.C., Hill D.F. The ovine Booroola fecundity gene (FecB) is linked to markers from a region of human chromosome 4q. Nature Genetics. 4:1993;410-414.
26. Perez Enciso M., Foulley J.L., Bodin L., Poivey J.P. Genetic implications of a bivariate threshold model for litter size components. J. Anim. Sci. 72:1994;2775-2786.
27. Piper, L.R., Bindon, B.M., Davis, G.H., 1985. The single gene inheritance of the high litter size of the Booroola Merino. Genetics of reproduction in sheep. Chapter 13 pp. 115-125.
28. Radcliffe J.E. Seasonal distribution of pasture production in New Zealand. 1. Methods of measurement. New Zealand Journal of Experimental Agriculture. 2:1974;337-340.
29. Scales G.H., Burton R.N., Moss R.A. Lamb mortality, birthweight, and nutrition in late pregnancy. N.Z. J. Agric. Res. 29:1986;75-82.
30. Wiener G., Woolliams C., Macleod N.S.M. The effects of breed, breeding system and other factors on lamb mortality. 1. Causes of death and effects on the incidence of losses. J. Agric. Sci. (Camb.). 100:1983;539-551.