Key words: Temporary calf removal, progestagens
, crossbred zebu, postpartum anestrus, fertility.
Alternatively, other synthetic oral progestagens
such as MPA are effective in preventing parturition (WHITELY et al.
Estrous synchronization can be managed by different programs including single or combined use of hormones such as progestagens
, estrogens, melatonin, PGF2[alpha], PMSG, hCG, GnRH in breeding, transition or anestrous seasons in goats (Alaam, 2005; Titi et al.
Stead-Richardson E, Bradshaw D, Friend T and Fletcher T (2010) Monitoring reproduction in the critically endangered marsupial, Gilbert's potoroo (Potorous gilbertii): Preliminary analysis of faecal oestradiol-17 beta, cortisol and progestagens
Synthetic estrogens are not estrogen and progestagens
are not progesterone.
Female reproductive efficiency--ovarian follicular development ovulation and embryo survival are controlled by steroid hormones progestagens
(mainly progesterone) and estrogens (mainly estradiol) (Fortune et al.
Of the oral progestagens
, progesterone itself has variable plasma concentrations,11 and side effects including such as nausea, headache, and sleepiness.
Since oral progestagens
are drugs for which patient compliance and treatment continuation rate is low during long-term treatment it is not a preferred method of treatment.
for pain associated with endometriosis (review).
24,25) The gonadotropins also stimulate the production of gonadal hormones (androgens, estrogens, progestagens
, and inhibin) that then exert negative feedback on the hypothalamus and consequently inhibit GnRH secretion.
Epidemiologic aspects of exogenous progestagens
in relation to their role in pathogenesis of human breast cancer.
Contraception with progestagens
in systemic lupus erythematosus.