By David E. Noakes, Timothy J. Parkinson, Gary C. W. England
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Extra info for Arthur's Veterinary Reproduction and Obstetrics
Non-hormonal methods Light The onset of cyclical activity in the mare, ewe, goat and cat is dependent upon changes in the hours of daylight. The mare and queen are stimulated to 39 1 1 NORMAL OESTROUS CYCLES activity by a lengthening photoperiod, whilst in the ewe and goat it is the effect of a decreasing photoperiod which is the stimulus. In ewes, the provision of housing with controlled lighting enables the breeding season to change from the autumn and winter, to spring and summer. Furthermore, by subjecting the ewes to a lighting regimen which does not have any change in duration it is possible to ensure breeding throughout the year, as is the case in equatorial climates.
In the later stages of the copulatory tie, which occupies from 15 to 25 minutes, she becomes restless and irritable and her attempt to free herself may cause the male considerable physical embarrassment. After the first 2 days of oestrus, sexual desire gradually recedes, but with the continued persuasion of the male she will accept coitus until the end of the period. Bleeding, although reduced in amount, generally continues well into oestrus. More often, however, the discharge becomes yellow as oestrus proceeds.
In Merinos, heat may last 48 hours. Ovulation occurs towards the end of oestrus, and the length of the oestrous cycle averages 17 days. They seek the ram, and together form a following ‘harem’. The ram ‘tries’ members of this group for receptivity by pawing with a forefoot, by rubbing his head along the ewe’s side and by nipping her wool. A nonreceptive ewe trots away, but when in full heat she ENDOGENOUS AND EXOGENOUS CONTROL OF OVARIAN CYCLICITY stands, waggles her tail and moves it laterally.
Arthur's Veterinary Reproduction and Obstetrics by David E. Noakes, Timothy J. Parkinson, Gary C. W. England