Journal article

Manipulation and control of the estrous cycle in pasture-based dairy cows

J Cavalieri, G Hepworth, LA Fitzpatrick, RW Shephard, KL Macmillan

THERIOGENOLOGY | ELSEVIER SCIENCE INC | Published : 2006

Abstract

Treatments designed to synchronize luteolysis, preovulatory follicular development, and ovulation, and resynchronize estrus after a first AI have improved responses to synchronization treatments. Protocols based only on the use of PGF result in variable onset of estrus. Concentrations of progesterone prior to administering PGF have affected submission rates and fertility while administration of estradiol benzoate (EB) after inducing luteolysis has improved the synchrony of estrus and ovulation in some studies. In pasture-based dairy cows, GnRH-based protocols have generally resulted in one-third of both anestrous and cycling cows conceiving following synchronization of ovulation and timed AI..

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