Early death from the first day of pregnancy until the age of 40 … and the rate of loss up to 12 days is unknown, “progesterone” and “GnRH” once prevented loss .. and “oestrus injection” The mare enters a new estrous cycle.
Dr. Awad Al-Junaidi.
Director of health care at Al Zahraa station.
“In the first period of pregnancy, between the first day and until the forty,” is the period of time that witnesses the early death of the fetus “losing it,” which is known among horse breeders as “sucking”.
The word “loss” is a description of what happens to the fetus, as the uterus at the death of the fetus at this stage of the gestational age absorbs the vesicle containing the fetus inside its folds, while the loss of the fetus after this age is called “abortion”, which results in the expulsion of the fetus and its contents outside uterus.
Early fetal loss is a major cause of lack of fertility in mares, where the rate of occurrence ranges between “7.5 to 25%”, as the percentage increases in mares of old age or those suffering from poor fertility.
It is noteworthy that the rate of early fetal death was not known almost precisely before the use of ultrasound “sonar” in the detection of embryos starting from the twelfth day of pregnancy, which led to the discovery of a previously unknown percentage, which is the embryos that die between the day. The twelfth and the twenty-fifth day, while the percentage of loss from the age between the first day until the twelfth day “before early diagnosis using (sonar)”, is still not known with any precise accuracy until now.
Causes of early fetal death
These reasons overlap, multiply and diverge for convenience and can be divided into causes related to the mother “Persians”, including: lack of secretion of progesterone “pregnancy hormone” from the corpus luteum, or the presence of infections of the lining of the uterus, blockage of the fallopian tube, the old age of the horse and the inability of the uterus to return to the state Natural quickly after childbirth.
As for the reasons related to the male horse, including: that the mare shares half of the genetic traits of the embryo, the horse (the sire) participates with the other half, so it may be responsible for producing weak embryos that do not have the ability to develop, divide and live.
While among the reasons related to the fetus itself: that the fetuses that suffer from genetic deficiencies or genetic disorders in their composition do not have the reasons for life and die quickly, as well as the embryos that are unable to alert the mother to their presence due to a lack of movement in the womb.
Among the reasons related to the surrounding environment and the method of breeding: recent studies have shown that during the first forty days of pregnancy, pregnant mares are exposed to severe tension or transported to long distances or harsh training that leads to the loss of the fetus and also if they suffer from a lack of nutrition in general and protein in particular.
Diagnosis of early fetal death.
There is no practical way to diagnose an early fetus so far other than using ultrasound (sonar), and that starts from the twelfth day. Several sequential examinations using (sonar) to follow the development and growth of the fetus.
And if the doctor finds something indicating that the fetus has stopped growing and has increased in size or that some of its vital signs are absent, then the fetus has already begun to die and gradually decay, and there is also a new technique to detect this using a type of sonar called Doppler or (color), and that is done by means of Uterine artery blood flow measurement.
It is mentioned that when there is a possibility of early fetal death or absorption, attention should be paid to making periodic checks to monitor the condition of the fetus. Early death can be prevented by supplying the mare with the pregnancy hormone (progesterone) or one of its derivatives from the diagnosis of pregnancy until the 150th day of pregnancy, and by injecting the mare with a single dose of a “GnRH” derivative, once on the tenth day of pregnancy.
Once the doctor confirms that the fetus has entered the stages of decay “indeed”, he injects the mare with a derivative of the substance “prostaglandin-F” or what is known as “the estrus injection”, in order to bring the mare back as soon as possible to enter a new cycle of estrus in which it is emptied again.
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