References

1. Senger, P.L. Pathways to Pregnancy and Parturition, 2nd Ed.; Current Conception, Inc.: Pullman, WA, 2000.

2. Ginther, O.J. Reproductive Biology of the Mare, 2nd Ed.; Equiservices: Crossplains, WI, 1992.

3. Daels, P.F.; Hughes, J.P. The Normal Estrous Cycle. In Equine Reproduction; McKinnon, A.O., Voss, J.L., Eds.; Williams & Wilkins: Media, PA, 1993; 121 131.

4. Hunter, M.G.; Wiesak, T. Evidence for and Implications of Follicular Heterogeneity in Pigs. In Control of Pig Reproduction III; Cole, D.J.A., Foxcroft, G.R., Weir, B.J., Eds.; The Journals of Reproduction and Fertility Ltd.: Cambridge, UK, 1990; 163 177.

5. Moeljono, M.P.E.; Thatcher, W.W.; Bazer, F.W.; Frank, M.; Owens, L.J.; Wilcox, C.J. A study of prostaglandin F2a as the luteolysin in swine: II. Characterization and comparison of prostaglandin F, estrogen and progestin concentrations in utero ovarian vein plasma of nonpregnant gilts. Prostaglan dins 1977, 14, 543 555.

6. Soede, N.M.; Kemp, B. Expression of oestrus and timing of ovulation in pigs. J. Reprod. Fertil. Suppl. 1997, 52, 91 103.

7. Foxcroft, G.R.; Van De Wiel, D.F.M. Endocrine Control of the Oestrous Cycle; Cole, D.J.A., Foxcroft, G.R., Eds.; Butterworths: London, 1982; 161 177.

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