Bovine Reproductive Cycle – Overview

Pregnancy Diagnosis – Manual – Foetal Aging

Pregnancy Diagnosis – Ultrasound – Foetal Aging

Below is a resource that assists with aging the bovine foetus

Common Reproduction Synchrony Programs

Prostaglandin based – Double PG:

Prostaglandin (PG) Based – Prostaglandin (PG) only works on cows that have ovaries with corpus luteal tissue, ≈ 2/3 of cows that are cycling will come into heat in the 5-d following an injection of PG

Note: PG will abort pregnancies that are less than 3 m pregnant

Prostaglandin based – The 6-day injection program (Why Wait)

Dairy Heifers – FTAI – 4 Yardings

Dairy Heifers – FTAI – 3 Yardings

Dairy Heifers – FTAI – 2 Rounds of AI

Dairy Cows – FTAI– Protocol 1- Ovsynch

The addition of a second 2ml dose of PG on day 8 has been shown to ↑ CR by ≈ 7 % in Australian herds

Dairy Cows – FTAI– Ovsynch Protocol 2- Double Ovsynch

Dairy Cows – FTAI– Ovsynch Protocol 3- G6G

Dairy Cows – FTAI– Protocol 4 – Ovsynch + eCG

The addition of eCG to the Ovsynch on day 7 can improve pregnancy rates especially in fresh cows and cows (> 5 y)

Dairy Cows – FTAI– Protocol 5 – P4 + Ovsynch

This program treats anoestrus (NVO) cows and cows with COD. The addition of a second 2ml dose of PG on day 8 has been shown to↑ CR by ≈ 5 %. If an early pregnancy Dx is carried out at day 32, 1) if NIC and no CL present, resynch with P4+ Ovsynch program, 2) if CL present could inject 2ml PG and AI to next oestrus

Beef Cattle – FTAI – J-Synch

Beef Cattle – FTAI – P4-Synch with ODB – Option 1

Beef Cattle – FTAI – P4-Synch with ODB – Option 2

Note: Inseminate heifers in standing oestrus inseminated first, Heifers not in standing oestrus, GnRH injection, draft and then AI in afternoon

Beef Cattle – P4-Synch EU approved (No ODB) – Heifers

Beef Cattle – P4-Synch EU approved (No ODB) – Cows

Beef Cattle Class/Species Specific– Bos Indicus Heifers – FTAI –Conventional

Beef Cattle Class/Species Specific– Bos Indicus Heifers – FTAI – J-Synch

Beef Cattle Class/Species Specific– Bos Taurus Cows – FTAI –Modified J-Synch – 7 d (64 h FTAI)

Beef Cattle Class/Species Specific– Bos Indicus Cows – FTAI Modified J-Synch – 7 d (72 h FTAI)

Superovulation (Examples)

Donor cow/ heifer

Recipient cow/heifer

Sexed-Sorted Semen – FTAI – Heifers – Dairy/Beef