Premarin, PremPro, PremPhase and PremPac-C are estrogen drugs made from the
urine of pregnant mares. There are an estimated 439 PMU farms in North America,
with the vast majority located in the prairie provinces of Western Canada.
The 439 figure includes 23 PMU farms in North Dakota, near the
Canadian border. Almost all PMU farms are under an exclusive
contract to provide pregnant mares' urine to Wyeth-Ayerst Laboratories.
Reports by investigaters list the following conditions the pregnant
mares are subjected to:
The pregnant mares may receive considerably less water than they would
normally drink. The drug company recommends that PMU farms use automatic
watering systems at timed intervals in carefully measured amounts. It has been
commonly reported that water was restricted in order to increase the concentration
of estrogens by volume of urine and thereby to reduce the shipping cost. The Physicians Committee for Responsible Medicine reports in their
Spring 1994 newsletter, A synthetic estrogen works as well as, if not better
than Premarin. The synthetic is closer to a human female's estrogen than is a
mare's estrogen. Many doctors agree. Refer to the 1996 Journal of Medical
Ethics article by Dr. Dennis Cox of Cambridge University Medical School
. He considers objections to the mistreatment of horses including
slaughtering of the majority of foals and concludes that plant-derived estrogen
(estriol) is "an effective, economical and acceptable alternative to equine
estrogen". In a letter to the New York Times Dr. Phillip Warner, an Orinda, CA
gynecologist with 30 years experience and Director of the Menopause Clinic of
Northern California states "prescribing Premarin for estrogen deficiency has
evolved as a 'Pavlovian response without any thought to individual treatment.'"
Warner continues, "The notion that a substance derived from horse urine is
"natural" to the human female is simply a tribute to 50 years of successful
advertising." Horseman and medical Dr. Ray Kellosalmi of Peachland, B.C.
states in The Animal Defense League of Canada Spring/Summer
1996 edition), "Premarin is the only estrogen containing materials from
horses' urine, and most of the 10 known hormones in Premarin are not at all
natural to the human female, being horse hormones that are chemically different
from human hormones." No major clinical benefit has been accepted and proven
for up to 8 of them.