The fetal canine testes produce anti-mullerian hormone and testosterone by sertoli and laydig cells I'm wondering do fetal ovaries produce any hormone or not
Yes, during the fetal period sexual hormones are produced which are crucial for sex differenciation.
Yes as folicles grow they produce low levels of oestrogens and other steroids even early in life and foetal life.
Testicular differentiation and testosterone secretion by Leydig cells occur at day 36 of pregnancy while the hypothalamic-pituitary-gonadal axis begins to develop when approximately 70 percent (day42) of pregnancy has passed so fetal masculinization and increasing of the fetal plasma androgen concentration is independent of pituitary gonadotropins however, Leydig cells respond to LH from the very early stages. Probably, according to the late activation of the hypothalamic-pituitary-gonadal axis except for testes, other gonads do not have many opportunities to produce hormones.
reference:
O'Shaughnessy, P.J. and P.A. Fowler, Endocrinology of the mammalian fetal testis.Reproduction, 2011. 141(1): p. 37.
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