The effects of ram exposure during progestagen oestrus synchronisation and time of ram introduction post progestagen withdrawal on fertility in ewes

Theriogenology

Volumn 63, Issue 3, 2005, Pages 860-871

  Hawken, P A R ^a   Beard, A P ^a   O'Meara, C M ^b   Duffy, P ^b   Quinn, K M ^b   Crosby, T F ^b   Boland, M P ^b   Evans, A C O ^b  

^a NEWCASTLE UNIVERSITY   (United Kingdom)

^b The Centre for Integrative Biology   (Ireland)

Author keywords

Breeding season; Embryo quality; Fertility; Litter size; Oestrus synchronisation; Ovulation rate; Ram effect; Sheep

Indexed keywords

GESTAGEN; SERIC GONADOTROPIN;

ANIMAL; ARTICLE; BREEDING; CLINICAL TRIAL; CONTROLLED CLINICAL TRIAL; CONTROLLED STUDY; CORPUS LUTEUM; EMBRYO; ESTRUS CYCLE; FEMALE; FERTILITY; HISTOLOGY; INTRAVAGINAL DRUG ADMINISTRATION; LITTER SIZE; MALE; METHODOLOGY; OVULATION; PHYSIOLOGY; PREGNANCY; RANDOMIZED CONTROLLED TRIAL; SHEEP; TIME;

ADMINISTRATION, INTRAVAGINAL; ANIMALS; BREEDING; CORPUS LUTEUM; EMBRYO; ESTRUS SYNCHRONIZATION; FEMALE; FERTILITY; GONADOTROPINS, EQUINE; LITTER SIZE; MALE; OVULATION; PREGNANCY; PROGESTINS; SHEEP; TIME FACTORS;

OVIS; OVIS ARIES;

EID: 11444265828     PISSN: 0093691X     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.theriogenology.2004.05.007     Document Type: Article

References (32)

1. Robinson JJ. Intensifying ewe productivity. In: Proceedings of the British Society of Animal Production 1974;3: 31-40 (new series).
2. Cohen-Tannoudji J., Locatelli A., Signoret J.P. Non-pheromonal stimulation by the male of LH release in the anoestrous ewe. Physiol. Behav. 36:1986;921-924
3. Martin G.B., Oldham C.M., Cognie Y., Pearce D.T. The physiological response of anovulatory ewes to the introduction of ram - a review. Livestock Prod. Sci. 15:1986;219-247
4. Pearce G.P., Oldham C.M. Importance of non-olfactory stimuli in mediating ram induced ovulation in the ewe. J. Reprod. Fertil. 84:1988;333-339
5. Knight T.W.P., Lynch P.R. The source of ram pheromones that stimulate ovulation in the ewe. Anim. Reprod. Sci. 3:1980;133-138
6. Perkins A., Fitzgerald J.A. The behavioural component of the ram effect: the influence of ram sexual behaviour on the induction of oestrus in anovulatory ewes. J. Anim. Sci. 72:1994;51-55
7. Atkinson S., Williamson P. Ram induced growth of ovarian follicles and gonadotrophin inhibition in anoestrous ewes. J. Reprod. Fertil. 73:1985;185-189
8. Lewis P.E., Inskeep E.K. Effect of rams on progestin-treated ewes. J. Anim. Sci. 37(5):1973;1195-1200
9. Romano J.E., Fernandez Abella D., Villegas N. A note on the continuous ram presence, oestrous duration and ovulation time in oestrous synchronised ewes. Appl. Anim. Behav. Sci. 73(3):2001;193-198
10. Maxwell W.M.C. Artificial insemination of ewes with frozen thawed semen at a synchronised oestrus. 1. Effect of time of onset of oestrus. Anim. Reprod. Sci. 10:1986;301-308
11. Romano J.E., Christians C.J., Crabo B.G. Continuous presence of rams hastens the onset of oestrus in ewes synchronised during the breeding season. Appl. Anim. Behav. Sci. 66(1-2):2000;65-70
12. Martin GB, SR, Oldham CM, Lindsay DR. Effects of progesterone on the responses of Merino ewes to the introduction of rams during anoestrus. Aust J Biol Sci 1983;36(4):369-78.
13. Roche J.F., Austin E.J., Ryan M., O'Rourke M., Mihm M., Diskin M.G. Regulation of follicle waves to maximize fertility in cattle. J. Reprod. Fertil Suppl. 54:1999;61-71
14. Leyva V., Buckrell B.C., Walton J.S. Regulation of follicular activity and ovulation in ewes by exogenous progestagen. Theriogenology. 50(3):1998;395-416
15. Ginther O.J., Bergfelt D.R., Beg M.A., Kot K. Follicle selection in cattle: role of luteinizing hormone. Biol. Reprod. 64(1):2001;197-205
16. Evans ACO, Duffy P, Crosby TF, Hawken PAR, Boland MP, Beard AP. Effect of ram exposure at the end of progestagen treatment on estrus synchronisation and fertility during the breeding season in ewes. Anim Reprod Sci, in press.
17. Parsons S.D., Hunter G.L. Effect of the ram on duration of oestrus in the ewe. J. Reprod. Fertil. 14:1967;61-70
18. Evans A.C.O., Flynn J.D., Quinn K.M., Madgwick S., Crosby T.F., Boland M.P., et al. Ovulation of aged follicles does not affect embryo quality or fertility after a 14-day progestagen estrus synchronisation protocol in ewes. Theriogenology. 56:2001;923-936
19. Lewis P.E., Bolt D.J., Inskeep E.K. Pattern of luteinizing hormone release in progestin treated ewes. J. Anim. Sci. 38(6):1974;1204-1209
20. Boscos CM, Samartzi FCS, Dellis A, Rogge A, Stefanakis, Krambovitis E. Use of progestagen-gonadotrophin treatments in estrus synchronization of sheep. Theriogenology 2002;58(7):1261-72.
21. Haresign W. Manipulation of reproduction in sheep. J. Reprod. Fertil. Suppl. 45:1992;127-139
22. Webb R., England B.G. Identification of the ovulatory follicle in the ewe: associated changes in follicular size, thecal and granulosa cell luteinising hormone receptors, antral fluid steroids, and circulating hormones during the preovulatory period. Endocrinology. 110(3):1982;873-881
23. Scaramuzzi R.J., McNeilly A.S., Tsonis C.G., Adams N.R., Baird D.T., Campbell B.K., et al. A model for follicle selection and the determination of ovulation rate in the ewe. Reprod. Fertil. Dev. 5:1993;459-478
24. Driancourt M.A. Regulation of ovarian follicular dynamics in farm animals. Implications for manipulation of reproduction. Theriogenology. 55:2000;1211-1239
25. Van de Leemput E.E., Vos P.L.A.M., Hyttel P., van den Hurk R., Bevers M.M., van der Weijden G.C., et al. Effects of brief postponement of the preovulatory LH surge on ovulation rates and embryo formation in eCG/prostaglandin treated heifers. Theriogenology. 55:2001;573-5492
26. D'Occhio M.J., Jillella D., Lindsay B.R. Factors that influence follicle recruitment, growth and ovulation during ovarian super stimulation in heifers: opportunities to increase ovulation rate and embryo recovery by delaying the exposure of follicles to LH. Theriogenology. 51:1999;9-35
27. Revah I., Butler W.R. Prolonged dominance of follicles and reduced viability of bovine oocytes. J. Reprod. Fertil. 106:1996;39-47
28. Mihm M., Curran N., Hyttel P., Knight P.G., Boland M.P., Roche J.F. Effect of follicle persistence on follicular fluid, oestradiol and inhibin in oocyte maturation in heifers. J. Reprod. Fertil. 102:1999;123-130
29. Homburg R. Adverse effects of luteinising hormone on fertility: fact or fantasy. Balliere's Clin. Obstetr. Gynaecol. 12(4):1998;555-563
30. Filcori M. The role of luteinising hormone in folliculogenesis and ovulation induction. Fertil. Steril. 71(3):1999;405-414
31. Vinoles C., Forsberg M., Banchero G., Rubianes E. Effect of long-term and short term progestagen treatment on follicular development and pregnancy rate in cyclic ewes. Theriogenology. 55:2001;993-1004
32. McEvoy T.G., Robinson J.J., Aitken R.P., Robinson I.S. The effect of time of intrauterine insemination on the development and viability of embryos collected from superovulated ewes. Theriogenology. 46:1995;727-738