Estrous synchronization Protocol for non-cyclic animals

Synchronization of estrus (heat) involves manipulating the estrous cycle of dairy/beef cattle so they can

be bred at approximately the same time.

Products use to Synchronize Estrus in Beef/Dairy Cattle

Progestins:

CIDR Vaginal insert 2 In heifers and cows

MGA 0.5 mg/hd/day, oral In heifers

CIDR Contains 1.38 grams of progesterone in silicone, molded over a nylon spine.

MGA is approved for suppressing estrus in feedlot heifers to improve performance in animals intended

for slaughter.

GnRH:

Cystrolrelin 2 mL, IM/IV bovine females

Factrel 2 mL, IM/IV dairy females

Fertagyl 2 mL, IM/IV bovine females

These Products used to treat cystic follicles in beef and dairy cattle.

Protocols: (For Adults)

1. Synchronization of Estrus using the Vaginal Insert CIDR:

Estrous synchronization using the vaginal insert CIDR consists of placing the insert in the vagina on day

0, giving an injection of prostaglandin on day 6, and removing the vaginal insert on day 7 .Detect heat

from days 8 to 11 and inseminate all females that exhibit estrus. To assure satisfactory synchronization of

estrus, an injection of prostaglandin must be given to all females one day before the removal of the

vaginal insert. Removal of the insert on day 7 results in a drop in circulating plasma progesterone,

triggering estrus within 3-4 days. The progestin in the vaginal insert can induce estrous cycles in

anestrous cows and advance puberty in heifers. The majority of the females that respond to this protocol

will exhibit estrus between 25 and 72 hours after the prostaglandin injection.

2. OvSynch:

Maximum No. of Injections = 3

Maximum No. of Handling Periods = 4

Duration of Protocol in Days = 10

Recommended for Timed AI = Yes

Breed Cows Showing Estrus Anytime During the Protocol

CIDR could be used between GnRH and PG (7 days

3. 48 Hour CoSynch :

Maximum No. of Injections = 3

Maximum No. of Handling Periods = 3

Duration of Protocol in Days = 9

Recommended for Timed AI = Yes

Breed Cows Showing Estrus Anytime During the Protocol

CIDR could be used between GnRH and PG (7 days)

4. 72 hours Cosynch:

Maximum No. of Injections = 3

Maximum No. of Handling Periods = 3

Duration of Protocol in Days = 10

Recommended for Timed AI = Yes

Breed Cows Showing Estrus Anytime During the Protocol

CIDR could be used between GnRH and PG (7 days)

5. 56 hour Ovsynch:

Maximum No. of Injections = 3

Maximum No. of Handling Periods = 4

Duration of Protocol in Days = 10

Recommended for Timed AI = Yes

Breed Cows Showing Estrus Anytime During the Protocol

CIDR could be used between GnRH and PG (7 days)

For Heifers:

1. Using MGA &prostaglandin Protocol to Synchronize Estrus:

A low cost system for estrous synchronization uses Melengestrol Acetate (MGA) and prostaglandin. MGA is a "progesterone-like" feed additive that suppresses estrus in feedlot heifers. MGA is fed at 0.5 mg/head/day for 14 days. Females will exhibit estrus 2-5days after withdrawal of the MGA. The estrus that occurs immediately after MGA feeding subfertile and females should not be bred on this estrus. A single injection of prostaglandin is administered 17 (or 19 days) days after the MGA has been removed from the feeding program. Most females will exhibit estrus 48 to 72 hours after the prostaglandin injection. Inseminate females 12 hours after standing estrus. This protocol is capable of inducing estrous cycles in some females that are not yet cycling. Timed mating all females or those that have not yet displayed heat at 72 hours (heifers) or 80 hours (cows) after the prostaglandin injection results in additional pregnancies

2. CIDR CoSynch:

Maximum No. of Injections = 3 Plus CIDR Insertion & Removal

Maximum No. of Handling Periods = 3

Duration of Protocol in Days = 8

Recommended for Timed AI = Yes

Breed Cows Showing Estrus After CIDR Removal

Resynch option: 13-14 days post AI insert CIDR, 7 days later remove CIDR and heat detect

3. Pfizer CIDR:

Maximum No. of Injections = 1 Plus CIDR Insertion & Removal

Maximum No. of Handling Periods = 4

Duration of Protocol in Days = 10 to 11

Recommended for Timed AI = No

Breed Cows Showing Estrus After CIDR Removal