|Home||First Posted: Mar 13, 2009|
Jan 31, 2015
Gestation and Foaling Tips
Always check with your vet!
There are many concerns when one is dealing with a pregnant mare and foaling. Below are some of the categories that one should consider:
The following are a number of helpful facts that may be useful to you regarding breeding your mare:
How Do You Know When Your Mare May Be Close to Foaling?
Many people now put in web cams where they can keep an eye on their mare. Also, baby monitors are being used, as well.
The Merck Vet Manual has the following:
"Preparation of the Environment:
Foaling box stalls should be large (at least 3.5 x 3 x 3.5 m). The foaling area should have good ventilation and be well bedded with clean, dry straw. The walls should be solidly constructed and free of sharp edges. Observation of the mare should be possible without disturbance.
Stages of Parturition:
Stage I is characterized by signs of abdominal pain and restlessness due to uterine contractions. Patches of sweat in the flank area and behind the elbows usually appear a few hours before foaling. The uterine contractions increase in frequency and intensity, causing the fetus to move into the pelvic canal, which causes the cervix to dilate. The fetus changes from a dorsopubic to dorsosacral position before parturition. Mares may roll during the first stage, which is thought to facilitate the rotation of the fetus. Increasing pressure in the uterus causes the allantochorion to protrude through the internal os of the cervix. The allantochorion over the cervix (cervical star) does not have microvilli and is thinner than the rest of the membranes. The allantochorion usually ruptures at the cervical star, and this marks the end of the first stage of parturition.
Stage II starts with the rupture of the allantochorion and ends when the fetus is delivered. Labor usually takes 10-30 min. Stimulation of the cervix by the fetus (Ferguson reflex) causes the mare to have abdominal contractions. The allantoic fluid lubricates the canal, facilitating expulsion of the amnion and fetus. Vaginal distention causes release of oxytocin and further myometrial and abdominal contractions. The amniotic membrane appears between the vulvar lips as a white, fluid-filled structure. The straining efforts of the mare consist of 3-4 strong contractions, followed by a short period of rest. The mare usually assumes lateral recumbency during delivery with her limbs extended. The foal is normally delivered in an anterior presentation and dorsosacral position with the head, neck, and forelimbs extended. One front hoof of the foal usually precedes the other by ~15 cm, facilitating passage of the elbows and shoulders through the pelvic canal. The foal is usually born with the umbilical cord intact and covered by the amnion, which is ruptured by movements of the mare or the foal. If amnion remains over the foal's nose, an attendant should remove it to prevent suffocation. If left undisturbed, the mare may lie for some time with the foal's hindlimbs in her vagina. If the foal has not been delivered within 30 min of the rupture of the chorioallantois and release of the tea-colored allantoic fluid, obstetric intervention is warranted.
Stage III involves expulsion of the fetal membranes. Normally, fetal membrane passage occurs rapidly (within 3 hr) after delivery of the foal. The weight of the amnion and cord helps the allantochorion separate from the endometrium. Progressive traction by the amnion and powerful uterine contractions originating at the tip of the horn cause complete separation of the allantochorion, which may become inverted during the process. The mare will stand with the amnion hanging from the vulva at the level of the hocks or below. If the mare kicks, which endangers the foal, the membranes should be tied above the hocks. If the fetal membranes have not been passed by 3 hr after parturition, oxytocin (20 IU, IV or IM) should be administered at 15-to 30-min intervals.
Premature Separation of the Placenta: Normally, the translucent white amnion appears first at the vulvar lips during the expulsion stage of labor. Premature separation of the placenta is characterized by the appearance of the bright red, velvety, intact chorioallantois between the vulvar lips before the foal is delivered. The presence of the chorion at the vulvar lips indicates that it has separated from the endometrium before the foal is able to breathe spontaneously. The chorioallantois must immediately be ruptured and the foal manually delivered, or the foal may asphyxiate. The severity and duration of asphyxia that results determines the severity of neurologic abnormalities displayed by the foal (peripartum asphyxia or neonatal maladjustment syndrome [Hypoxic Ischemic Encephalopathy: Introduction])."
Add the date of exposure and this calculator will give you an estimated due date for your latest foal.
Enter the lifestyle and weight of your horse and this will tell you how many calories a day your animal needs.
Input the dam and sire coat information and it will calculate the possible offspring coat colors and their probability.
Whether you need to know how much dewormer to give your horse or how much you should feed him, knowing how to estimate his weight in pounds is helpful.