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Unformatted text preview: 164 ANS 3319C Reproductive Physiology and Endocrinology Estrous Synchronization Reproductive Management: Estrous Synchronization 1) Function ♦ Facilitates breeding management: natural and(or) AI ♦ Facilitates é use of genetically superior sires • Natural service sires: cost, location, physical liabilities, health concerns ♦ é animals in estrus over a short period of time • ê time & labor for estrus detection 2) Exogenous PGF 2 α to synchronize estrus ♦ Induce luteolysis è estrus ♦ Types of PGF 2 α (Dosage: species dependent; values are for cattle) • Dinoprost tromethamine (Lutalyse, Prostamate): natural form 25 mg I.M. • Cloprostenol (Estrumate, estroPlan): analogue 500 μ g I.M. • Fenprostenol (Bovilene): analogue 1 mg I.M. ♦ Requirements (i.e., Cattle) • Must have functional CL (Fig 9-19) ♦ Effective days 5-15 estrous cycle ♦ Not effective days 0-4 & 16-21of estrous cycle • No effect in anestrous animals (No CL) 165 ANS 3319C Reproductive Physiology and Endocrinology Estrous Synchronization ♦ Estrous synchronization • Cattle, Sheep, Horses ♦ Estrus: 2-7 d post PGF 2 α • Variation due to stage of follicle development • Swine: only effective d 12-14 of estrous cycle ♦ Not routinely used ♦ Lactating sow: wean piglets 21 d old è estrus 3-5 d • Cats, Dogs: not routinely used (adverse side effects) ♦ Other management uses of PGF 2 α • Induce parturition (absence of placental progesterone) • Induce abortion: mismatched matings ♦ Cattle (day of gestation) • < 120 d: single injection • > 120 d: single injection kills CL but placenta progesterone maintains pregnancy ♦ Mare (day of gestation) • 5-35 d: single injection • 35-70 d: several days, repeated injections • > 70 d: more difficult because of endometrial cups • > 160 d: will not work 165 ANS 3319C Reproductive Physiology and Endocrinology Estrous Synchronization ♦ Estrous synchronization • Cattle, Sheep, Horses ♦ Estrus: 2-7 d post PGF 2 α • Variation due to stage of follicle development...
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- Fall '09
- progesterone, Endometrium, CIDR, ANS 3319C Reproductive, 3319C Reproductive Physiology