Serum progesterone, oestradiol, luteinizing hormone and prolactin profiles in the female black bear (Ursus americanus).
Tsubota T, Howell-Skalla L, Boone WR, Garshelis DL, Bahr JM. Serum progesterone, oestradiol, luteinizing hormone and prolactin profiles in the female black bear (Ursus americanus). Anim Reprod Sci. 1998 Oct; 53(1-4):107-18.