What are the protocols for synchronizing estrus for dairy cattle?

Two injections of GnRH, 7 days before and 2 days after prostaglandin (PGF2a), will effectively synchronize ovulation in more than 90 percent of lactating cows treated. Giving the second GnRH at 56 hours is very beneficial. Time of ovulation occurs 24 to 32 hours after the second injection of GnRH.

How estrus synchronization is done?

Estrous (heat) synchronization in beef cattle involves manipulating the females’ estrous cycle so they can be bred at about the same time. The normal 21-day estrous cycle in beef cattle can be altered by following an effective estrous synchronization protocol.

What is estrus synchronization used for?

Many producers utilize estrus synchronization to tighten up their calving interval. Cows will calve within a few days of each other, lessening the time you need to spend watching them. Tighter calving intervals, or having cows calve in a shorter window, creates a more uniform calf group to market at weaning time.

Why do we synchronize dairy cattle?

A proper synchronization program ensures animals are inseminated until they conceive or are culled. A syn- chronization program will help decrease the average days in milk (DIM) of the herd, decrease the DIM at first service, and decrease the calving interval. These are all factors that increase profitability.

Which is the most important Managemental requirement for estrus synchronization?

For best results with an estrus synchronization program and to ensure optimum fertility, ranchers should:

• Practice high-quality herd management.
• Provide adequate nutrition, because undernourished cows may not respond to treatment, much less conceive.
• Vaccinate before the breeding season to prevent reproductive diseases.

Why synchronizing estrus can be better for the farmer?

The Benefits of Estrous Synchronization. No matter when you calve, controlling the breeding and the subsequent calving season has many benefits. A shortened calving season provides producers a better opportunity to offer improved management and observation of the cow herd, which should result in fewer losses at calving …

When was estrus synchronization first used?

Research during the 1940s to 1960s, using gonadotropins and progesterone to manage the estrous cycle of cattle, established the concepts for estrous synchronization and stimulated commercial research directed at developing cost-effective progestogen estrous synchronization products, leading to commercially available …

What is an advantage of synchronizing a cow herd?

Synchronizing estrus in your beef herd can shorten your calving season, produce more uniform calf weights, and last but not least, provide the opportunity to use proven genetics through artificial insemination (AI).

What is Lutalyse injection?

LUTALYSE Injection is used to control the timing of estrus and ovulation in estrous cycling cattle that have a corpus luteum. Inject a dose of 5 mL LUTALYSE Injection (25 mg dinoprost) intramuscularly either once or twice at a 10 to 12 day interval.

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 are the different kinds of prostaglandins used to synchronize estrus?

Successful synchronization of estrus requires control of both the luteal and follicular phases of the estrous cycle. Estrous synchronization protocols can be grouped into four main classes: 1) prostaglandin F2α (PG) based, 2) gonadotropin releasing hormone (GnRH) based, 3) progestin based, and 4) combination.

How long after Lutalyse does a cow come in heat?

2 to 5 days
Ovulation occurs just after she is in heat. An injection of Lutalyse causes the corpus luteum to regress earlier than normal. This elimi- nates the source of progesterone. Usually, in 2 to 5 days after receiving Lutalyse, the female comes into heat and is ready for breeding.

What does GnRH do in cattle?

GnRH is a hormone made in a part of the cow brain that acts to release more hormones (FSH and LH) that are vital for successful follicular development and ovulation in the ovary.

Where do you inject Lutalyse?

LUTALYSE HighCon Injection is used to control the timing of estrus and ovulation in estrous cycling cattle that have a corpus luteum. Inject a dose of 2 mL LUTALYSE HighCon Injection (25 mg dinoprost) intramuscularly or subcutaneously either once or twice at a 10 to 12 day interval.