Dairy3- OvSynch

increase milk production, reduce replacement costs, accelerate genetic improvement

AI to natural estrus

management/ environment

efficient method of use of AI, organize farm labor, reduce need for estrus detection, schedule hormone treatments, dry off (know exactly when to), know expected calving dates, record management, improves service rate

service rate x conception rate

% of eligible open cows that are bred per unit of time (21 days); equivalent to heat detection rate

% of bred cows that become pregnant, # preg/ # inseminated, changes with pregnancy diagnosis method

labor, compliance to specific protocols, accurate records, public perception, good nutrition and management is key

hypothalamus; induce ovulation of ovarian follicles.

uterus; luteolysis

ovaries; increase progesterone in the blood

5 days (prostaglandin won't work)

estrus followed by ovulation 2-5 days after injection.

Prostaglandin (you need the CL to maintain the pregnancy)

GnRH--(7d)--> PGF--(56hr)--> GnRH--(16hr)--> timed AI