Reproduction06
•Télécharger en tant que PPT, PDF•
12 j'aime•4,356 vues
This document provides an overview of equine reproduction terminology and processes. It discusses stallion physiology, sperm production and output, mare anatomy, the estrous cycle, estrus synchronization methods, breeding techniques, factors influencing pregnancy, gestation, parturition, and foal immunity through colostrum intake. Key topics covered include the 21-day estrous cycle stimulated by photoperiod changes, evaluation and preparation of mares for breeding, cooled and frozen semen techniques, and importance of adequate colostrum for newborn foal health.
![TERMINOLOGY ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Recommandé
Recommandé
Contenu connexe
Tendances
Tendances (20)
En vedette
En vedette (16)
Similaire à Reproduction06
Similaire à Reproduction06 (20)
Plus de fourinhand
Reproduction06
- 3. Stallion Physiology 1-2 days Survival time with fertilizing capacity 6 # sperm/ejaculate X 10 9 30-800 ml Sperm concentration X 10 6 20-100 ml Semen volume/ejaculate Sperm output 2-4 days Life span of sperm in female tract 10-24 mo Onset of sexual maturity
- 11. Receptors in eye Pineal gland Hypothalamus Anterior pituitary Ovaries Increasing day length Decreasing day length Neuropathway Neuropathway Decreasing melatonin Increasing melatonin Increasing GnRH Decreasing GnRH Increasing gonadotropins Decreasing gonadotropins J F M A M J J A S O N D
- 15. Estrous Cycle 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Sat Fri Thu Wed Tue Mon Sun
- 33. GROWTH CURVE Gestation age in days CR in cm
Notes de l'éditeur
- Ovary – 2X1.5” in diameter. Located on pinched in face of ovary is ovulation fossa – unique anatomical feature of equine ovary. Oviducts = ~8-12”long. Uterus – Body & 2 horns. 8” wide X 3” wide Cervix – 2-3”. Longitudinal folds Vagina – 7-9” long & 4-5” diameter
- Anestrus – The period when most mares show no signs of reproductive activity at all. Diestrus – The period when the mare is not receptive to the stallion (usually lasts 17-19 days) Estrous – Entire reproductive cycle. The average length of the estrous cycle is 21-23 days (from one ovulation to the next). Estrus – Refers to “heat”, the period when the mare is receptive to the stallion (usually lasts 5-6 days).
- Photoperiod Effect Reproductive activity in spring is stimulated by an increasing photoperiod Mechanism Alteration of hormone secretion by the pineal gland and hypothalamus
- Increased photoperiod stimulates the hypothalamus and pituitary Pituitary hormones (especially FSH) induce follicular development Note – Multiple follicles on ovary.
- Note: 5 days estrus. To estimate the next cycle, count 21 days from the 1 st day of estrus or 15 days from the last day of estrus.
- Ovulation normally occurs when follicle reaches 4-5 cm
- Normalization of estrus in the early breeding season. Control of estrus in mares exposed to artificial light. Regulation of estrus in cycling mares. Appointment breeding. Estrus suppression in performance mares. Delaying foal heat. Pregnancy maintenance.
- ADVANTAGES Cost No mare care or shipping expenses Genetics Potential access to higher quality Disease Decreased transmission of std’s DISADVANTAGES Cost Cost & shipment Veterinary/technician expenses Technology/management Competent individuals Stallion variability DISADVANTAGES Cost Cost & shipment Veterinary/technician expenses Technology/management Competent individuals Stallion variability
- Summer 7-10 days shorter Winter - longer