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New Zealand Journal of Agricultural Research Volume 23, 1980 - Issue 4
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Original Articles

Oestrous response of lambs to oestrogen in relation to their fertility at two years of age

D. Whyman Ministry of Agriculture and Fisheries, Whatawhata Hill Country Research Station, P. B., Hamilton, New Zealand
Pages 421-425 | Received 09 Nov 1979, Published online: 21 Dec 2011

References

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  • Clegg , M. T. , Santolucito , J. A. , Smith , J. D. and Ganong , W. F. 1958 . The effect of hypothalamic lesions on sexual behaviour and oestrous cycles in the ewe . Endocrinology , 62 : 790 – 797 .
  • Hight , G. K. 1975 . “ Sheep selection experiment, Whata-whata Hill Country Research Station ” . In Annual Report of Research Division, 1974–1975 , 90 – 92 . New Zealand Ministry of Agriculture & Fisheries . in
  • Hight , G. K. and Jury , K. E. 1976 . Hill country sheep production. VIII. Relationship of hogget and two-year-old oestrus and ovulation rate to subsequent fertility in Romney and Border Leicester × Romney ewes . N.Z. Journal of Agricultural Research , 19 : 281 – 288 .
  • Hulet , C. V. , Wiggins , E. L. and Ercanbrack , S. K. 1969 . Estrus in range lambs and its relationship to lifetime reproductive performance . Journal of Animal Science , 28 : 246 – 252 .
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  • Land , R. B. 1978 . Reproduction in young sheep: some genetic and environmental sources of variation . Journal of Reproduction and Fertility , 52 : 427 – 436 .
  • Radford , H. M. 1967 . The effect of hypothalamic lesions on reproductive activity in sheep . Journal of Endocrinology , 39 : 415 – 422 .
  • Rae , A. L. 1958 . “ Methods of selection for lamb production ” . In Sheepfarming Annual , 231 – 238 . Palmerston North : Massey Agricultural College . in
  • Siegel , S. 1956 . Nonparametric Statistics for the Behavioural Sciences , New York : McGraw-Hill .
  • Snedecor , G. W. 1956 . Statistical Methods , 5th ed. , Iowa State College Press .
  • Tomkins , T. and Bryant , M. J. 1974 . Oestrous behaviour of the ewe and the influence of treatment with progestagen . Journal of Reproduction and Fertility , 41 : 121 – 132 .
  • Whyman , D. 1978 . Oestrous and ovarian responses to exogenous progesterone and oestrogen in prepu-bertal ewe lambs in relation to the fecundity of their dams . Journal of Reproduction and Fertility , 53 : 323 – 330 .

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