Equine reproductive physiology, breeding and stud management by Mina C. G. Davies Morel

By Mina C. G. Davies Morel

This booklet comprises 21 chapters on horse replica and breeding, together with the anatomy and regulate of copy in mares and stallions, body structure and endocrinal keep watch over of being pregnant and foaling, lactation, choice and guidance of mares and stallions for breeding, administration of the mare while pregnant and foaling, foal administration, weaning, stallion administration, infertility, synthetic insemination and embryo move. on hand In Print

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44 The second and third stages of semen deposition are emission, the passage of seminal plasma from the accessory glands and sperm from the epididymis to the urethral area of the penis; and ejaculation, the passage of this seminal plasma and sperm (semen) along the penis and into the mare after intromission. The control of these two stages is very similar and they occur as a continuum. Sensory stimulation, such as temperature or pressure, of the glans penis activates sensory afferent nerves which send impulses to the lumbosacral region of the spine.

Uterine myometrial (muscle cell) contractility also varies with the cycle, being more active during oestrus. This activity encourages the expulsion of uterine exudates, as well as excess sperm and seminal plasma if the mare is mated, which is particularly important at a time when the tract is most vulnerable to uterine infection. 2). In general, the changes within the uterus result in an increase in uterine wall thickness and turgidity as the mare goes from oestrus into dioestrus in preparation for the imminent implantation of an embryo.

Conclusion It can be concluded that the male reproductive tract is specifically designed for the efficient production, storage and subsequent deposition of sperm within the female tract. It also ensures that the sperm are deposited in a medium (seminal plasma) which is able to provide all the elements for their survival, so maximizing the chances of fertilization. 1. Introduction The mare is naturally a seasonal breeder, showing sexual activity only during the spring, summer and autumn months. This is termed the breeding season, and the non-breeding season is termed anoestrus.

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