What is timed AI?
Basics to a Timed-AI Program Unlike programs designed to synchronize the expression of behavioral estrus into a three to seven day period, timed-AI programs are designed to synchronize ovulation among a group of animals that are often in various stages of the estrous cycle at the initiation of the program.
How much Lutalyse do you give a cow?
Inject a dose of 5 mL LUTALYSE Injection (25 mg dinoprost) intramuscularly either once or twice at a 10 to 12 day interval. With the single injection, cattle should be bred at the usual time relative to estrus.
What is timed insemination?
Timed artificial insemination (AI) is a technology developed in the early and mid-90’s that allowed performing insemination at fixed time without the need of estrous detection, write Dr Lima and Professor Santos.
How hard is it to AI cattle?
In cattle, AI is performed using a recto-vaginal technique. It is necessary that the operator is previously trained in this technique, although it is not difficult, it requires some skills and training to guarantee good results.
How many times are cows artificially inseminated?
On average between 50%-70% of a herd will conceive to a single timed insemination. This is pretty similar to the percent of cows a bull will breed on a single cycle. Most herds employ a “clean-up bull” to breed the remaining open cows on the following 2-3 cycles.
How do you bring a cow into heat?
The standard treatment for cows with a corpus luteum (CL) is an injection of prostaglandin (PG) which will bring most cows into heat two to four days after injection. Combining the PG with heat detection focussed on the treated cow will result in cows getting pregnant more quickly.
How long can you leave a CIDR in a cow?
Specifically within the heifer protocols, CIDRs can be used for 5, 6, 7 or 14 days. When utilizing the 14-day CIDR it is important to remember to never breed females on the first estrus after CIDR removal due to persistent, aged follicles which are likely less fertile and would not return favorable results.
Where can I get AI for my cows?
The NFREC is a research and education campus for the University of Florida. It runs its cow herd as a commercial operation, but shifted from breeding cows with natural service to FTAI, giving every female the opportunity to become pregnant through AI.
How is artificial insemination ( AI ) performed in cattle?
In cattle, AI is performed using a recto-vaginal technique. It is necessary that the operator is previously trained in this technique, although it is not difficult, it requires some skills and training to guarantee good results.
How old does a cow have to be to be pregnant on Tai?
Overall, three-year-old-or-older cows were 3.9 times more likely to be pregnant at the end of the breeding season than were two-year-old cows (94% vs. 79%). Researchers conclude that two doses of PG injected eight hours apart following CIDR removal are required to maximize TAI pregnancy rates of the five-day protocol.
Which is better for artificial insemination Tai or CIDR?
Comparisons of pregnancy rates of fixed-timed artificial insemination (TAI) protocols in mature, suckled beef cows have generally favored the five-day, progesterone-impregnated, controlled internal drug release (CIDR) synchronization protocol over the seven-day CIDR program.