How Do You Induce Ovulation In A Horse?

The dosage to induce the ovulation is between 1500 and 3000 IU of hCG and can be administered intravenously or intramuscularly, when the mare forward follicle with a diameter of 35 to 40 mm. This helps the ovulation within 48 to 56 h (Ley, 2006).

How do I make my horse ovulate?

To successfully induce ovulation, the mare should be cycling, in heat, with a developing dominant pre-ovulatory follicle of at least 35 mm or greater. On ultrasound, she typically should have some edema in her uterus, which would correlate to whether or not she is in behavioral heat.

What do you give a mare to make her ovulate?

The standard agent used to induce or “speed up” ovulation hasbeen hCG or human chorionic gonadatropin. This drug is given to mares withenlarging follicles and it serves to hasten the process of ovulation.

How do you induce estrus in horses?

The administration of altrenogest or progesterone in oil for nine days, plus an injection of prostaglandin (the hormone that works to bring a mare into estrus) on day nine, has proven to be an effective combination for estrus synchronization, says Squires.

How do you make a horse go into heat?

There are two primary methods for inducing heat (ovulation) in the mare; these are manipulation of the photoperiod (light cycle) and chemical manipulation of the mare’s estrous cycle.

What causes a mare not to ovulate?

In most instances, failure to cycle after foaling is due to a combination of season (i.e. mares that foal in January, Page 2 2 February or March), inadequate nutrition, and lactation. Another potential cause of failure to cycle in a mare is called pseudopregnancy or persistence of the corpus luteum.

Can you induce a mare?

Parturition in horse mares can be induced with oxytocin or with prostaglandin F2α. Induction of parturition often results in the birth of premature, non-viable foals. Progestogen treatment does not delay but advances foaling. Low dose oxytocin (2.5–3.5 IU) induces parturition only in mares ready for foaling.

What does Lutalyse do in mares?

Lutalyse is indicated for its luteolytic effect on corpora lutea in mares to “induce” estrus and may be utilized to stimulate regression of the corpus luteum followed by return to estrus and/or ovulation in mares demonstrating extended diestrus.

When should I give my horse Lutalyse?

Controlling Time of Estrus of Estrous Cycling Mares: Mares treated with LUTALYSE during diestrus (4 or more days after ovulation) will return to estrus within 2 to 4 days in most cases and ovulate 8 to 12 days after treatment. This procedure may be utilized as an aid to scheduling the use of stallions.

How often does a mare ovulate naturally?

Although the mare continues to ovulate regularly every 21 days throughout the breeding season, the length of estrus (sexual receptivity) varies from 2–8 days, and the length of diestrus varies accordingly to maintain a 21-day interval.

Can you tease a mare into heat?

Teasing the mare means exposing her to a stallion or androgenised gelding to determine her sexual behaviour. It is used to assist in assessing the significance of structures on the ovaries. Ideally, mares should be teased daily to determine when they first show signs of heat.

How can I help my mare in heat?

To help your mare feel more comfortable, it may be recommended to supplement the mare’s diet either on an ad hoc basis or continuously during the oestrus cycle. Herbal products that relieve stress are especially popular.

What makes a mare go into heat?

The hormones used are prostaglandins—a natural form (Lutalyse) or a synthetic (Estrumate). Like the prostaglandin produced by the lining of the mare’s uterus at the end of diestrus, they break down the corpus luteum and stop the production of progesterone. That allows the mare to come into heat.

How long after PG will a mare ovulate?

The mare will come into estrus 2–5 days after administration of PGF _2α. Time to ovulation is variable (3–10 days) and depends on the stage of the mare’s current follicular wave and on the size and character of follicles at the time of PGF _2α administration.

What is the most common cause of infertility in mares?

Endometritis, a common cause of infertility in mares.

When are mares most fertile?

Mares are highly seasonal when it comes to breeding, with their most fertile period, being from the end of winter (August) to start of autumn (March). For this reason, mares are termed “long day breeders” as the breeding season occurs during summer when daylight hours are longest.

How can I speed up my horse pregnancy?

The exact duration within that timeframe is random for each pregnancy. There is no way to speed up pregnancies, not even through artificially ageing the mare.

How do you artificially inseminate a mare?

The mare is inseminated. A plastic AI pipette is passed gently through the mare’s cervix and the semen is injected into the uterus. For frozen semen, the semen must first be thawed in a water bath at a very specific temperature and ideally delivered deep into the uterine horn with a specialized pipette.

How much oxytocin do you give a mare?

Non-Pregnant Mares
In our clinic, we use 20 IU (1ml) of oxytocin in the muscle every 4 hours. Oxytocin has a half-life of only 6 minutes.

Can Lutalyse cause infertility?

May cause skin irritation. May be absorbed through the skin and cause systemic effects. Systemic exposure may affect reproductive hormone regulation and thus affect fertility and maintenance of pregnancy.

How long does it take for Lutalyse to work?

Estrus is expected to occur 1 to 5 days after injection if a corpus luteum was present. Cattle that do not become pregnant to breeding at estrus on days 1 to 5 after injection will be expected to return to estrus in about 18 to 24 days.