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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 use of genetically superior sires Natural service sires: cost, location, physical liabilities, health concerns animals in estrus over a short period of time time & labor for estrus detection 2) Exogenous PGF 2 to synchronize estrus Induce luteolysis estrus Types of PGF 2 (Dosage: species dependent; values are for cattle) Dinoprost tromethamine (Lutalyse, Prostamate): natural form 25 mg I.M. Cloprostenol (Estrumate, estroPlan): analogue 500 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 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 estrus 3-5 d Cats, Dogs: not routinely used (adverse side effects) Other management uses of PGF 2 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 Variation due to stage of follicle development...
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This document was uploaded on 01/15/2012.
- Fall '09