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PROGESTERONE PRIMER Patrick M. Mccue DVM, Phd, Diplomate American College of Theriogenologists

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PROGESTERONE PRIMER Patrick M. Mccue DVM, Phd, Diplomate American College of Theriogenologists PROGESTERONE PRIMER Patrick M. McCue DVM, PhD, Diplomate American College of Theriogenologists Progesterone is one of the key reproductive than 1 ng/ml after prostaglandins are hormones in the mare. It is the hormone that released from the uterus 13 to 15 days after takes a mare out of heat after ovulation and ovulation. The absence of progesterone and it is absolutely required for the maintenance the increase in levels of estrogen produced of pregnancy. The goal of this article is to by the next dominant follicle cause the mare review sources and blood levels of to return to estrus. progesterone in non-pregnant and pregnant mares and to discuss supplementation of If the mare is pregnant, a critical event mares with exogenous progesterone to termed maternal recognition of pregnancy maintain pregnancy. occurs which prevents release of prosta- glandins and destruction of the corpus The large preovulatory follicle of the luteum. Consequently, progesterone mare is filled with follicular fluid and production by the ovarian corpus luteum contains a single oocyte or egg. Cells lining continues in the pregnant mare. Pregnant the follicle produce the hormone estradiol- mares begin to form additional or secondary 17β (an estrogen) that stimulates behavioral corpora lutea by day 40 to 45 of gestation. estrus or heat. Ovulation is the process Secondary CL’s are unique to the mare and during which the follicle ruptures and are stimulated to develop in response to the releases the follicular fluid and egg. The hormone equine chorionic gonadotropin egg is transported down the oviduct where (eCG) produced by endometrial cups of the fertilization may occur if the mare had been placenta. Progesterone levels in blood bred. After ovulation, the collapsed follicle increase markedly due to the presence of fills up with blood and the cells lining the secondary corpora lutea and reach peak former follicle invade the blood clot. Over levels at 2 to 3 months of gestation. the next few days the cells organize into a Production of progesterone by the ovaries structure called the corpus luteum (CL) and subsequently declines over the next few begin to produce the hormone progesterone months. and the mare goes out of heat. Progesterone levels first rise above baseline levels (greater The placenta begins to produce progesterone than 1 ng/ml) by 12 to 24 hours after between day 70 and 90 of pregnancy. By ovulation. Levels of progesterone reach a day 90 to 100, the placenta produces plateau of 5 to 10 ng/ml between days 5 and sufficient progesterone and other progestins 14 after ovulation in the nonpregnant mare. to maintain pregnancy without any ovarian Concentrations then decline rapidly to less support. Concentrations of progesterone 1 measured in blood are only 2 to 3 ng/ml Several types of progesterone products have during the second half of gestation. This is been used in an attempt to maintain much lower than levels during the first 3 pregnancies in mares. The synthetic months of pregnancy. progestin altrenogest or Regumate® is the Blood samples are often collected from only product that will consistently maintain pregnant mares to determine if progesterone pregnancy in a mare that does not produce levels are adequate to maintain the sufficient quantities of her own progesterone. pregnancy. Interpretation of blood proges- Administration is usually initiated within a terone levels must take into account the few days after ovulation and is continued month or stage of pregnancy. Early in until day 120 of pregnancy, at which time pregnancy progesterone levels above 4.0 production of progesterone by the placenta ng/ml are considered adequate to support is adequate to maintain pregnancy. pregnancy. Mares with concentrations Supplementation may be discontinued at an below 4.0 ng/ml may be at some risk of earlier date, such as day 50 to 60 of pregnancy loss and supplementation may be pregnancy, if natural or endogenous blood warranted. As noted previously, proges- levels of progesterone are determined to be terone levels are commonly between 2 and 3 adequate. Administration of Regumate® ng/ml from mid-pregnancy to term and will not interfere or cross-react with natural supplementation based on ‘low blood levels’ progesterone on a blood test. Alternative is usually not warranted. medications, such as injectable hormones used to prevent pregnancies in women (i.e. Progesterone supplementation in pregnant medroxy-progesterone or Depo-Provera®) mares has become very common in the last 5 have been shown in controlled clinical trials to 10 years. Mares are often administered to be ineffective in maintaining pregnancy in exogenous progesterone without any mares. Consequently, the use of these knowledge of their natural blood levels of alternative products cannot be recommended. progesterone. Administration of proges- terone is typically used as ‘insurance’ in an effort to help maintain a valuable pregnancy. Unfortunately, there is little scientific evidence to support the theory that giving extra progesterone to a normal mare will either increase the pregnancy rate or decrease the incidence of pregnancy loss. However, anecdotal reports do suggest that some mares with a history of repeated pregnancy loss will stay pregnant when supplemented with progesterone. Photograph of a corpus luteum within an ovary 2 Ultrasound photograph of a corpus luteum 3.
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