par pat g » 2 Sep 2009 13:06
Tiens puisque l'on parle d'oestrogène-like et d'os, je suis tombé sur cela :
Exposure to exogenous estrogen through intake of commercial milk produced from pregnant cows.
Maruyama K, Oshima T, Ohyama K.
Interdisciplinary Graduate School of Medicine and Engineering, Department of Clinical Nursing and Pediatrics, University of Yamanashi, Yamanashi 409-3898, Japan.
BACKGROUND: Modern genetically improved dairy cows continue to lactate throughout almost the entire pregnancy. Therefore, recent commercial cow's milk contains large amounts of estrogens and progesterone. Among the exposure of prepubertal children to exogenous estrogens, we are particularly concerned with commercial milk produced from pregnant cows. We examined concentrations of serum and urine sex hormones after the intake of cow milk.
METHODS: Subjects were seven male adults, six prepubertal children, and five female adults. Male adults and children drank 600 ml/m(2) of cow milk. Urine samples were collected one hour before the milk intake and 4 times every hour after the intake. In male adults, serum samples were obtained before and 15, 30, 45, 60, 90 and 120 minutes after the milk intake. Female adults took 500 ml of cow's milk every night for 21 days beginning the first day of the second menstruation. In three successive menstrual cycles, the day of ovulation was examined by an ovulation checker.
RESULTS: After the intake of cow milk, serum E1 and progesterone concentrations significantly increased, and serum LH, FSH and testosterone significantly decreased in male adults. Urine concentrations of E1, E2, E3 and preganediol significantly increased in all adults and children. In 4 out of 5 females, ovulations occurred during the milk intake, and the timing of ovulation was similar among the 3 menstrual cycles.
CONCLUSIONS: Our data on male adults and children indicate that estrogens in milk were absorbed, and gonadotropin secretion was suppressed, followed by a decrease in testosterone secretion. Sexual maturation of prepubertal children could be affected by the ordinary intake of cow milk.
inquiétant non ?
