title: Plasma steroid variations in bull calves repeatedly treated with testosterone, nortestosterone and oestradiol administered alone or in combination.
abstract: The aim of this work was to investigate the secretion of dehydroepiandrosterone (DHEA), testosterone (T), dihydrotestosterone (DHT) and oestradiol (E) as biological markers in response to illegal administration of testosterone, 19-nortestosterone (N) and oestradiol, either alone or in combination. Twenty male Friesian calves (age 13-14 months) were allotted to a control group (n = 5), and five experimental groups (n = 3) each. Each experimental animal was repeatedly injected with one of the following hormonal treatments: E, T, N, T+E and N+E. Circulating DHEA, T, DHT and E were determined by radioimmunoassay. The administration of T alone did not induce any variation in plasma DHEA, T, DHT and E, which were similar to those in the control group. In contrast, DHEA, T and DHT were on average significantly lower in the T+E and N-treated groups (p < 0.01), whereas the administration of N+E resulted in the reduction of plasma T and DHT without any modification of plasma DHEA. The administration of E alone or in combination increased circulating levels of E but did not affect androgen plasma profiles. The results indicate that plasma levels of T do not permit detection of illegal treatments because plasma androgens always remained within the physiological range. Illegal E treatment could be detected in blood samples when they were collected at least every 20 days.
authors.affiliation: Dipartimento di Scienze Sperimentali Veterinarie, Università di Padova, Agripolis, 35020 Legnaro (PD), Italy. claudia.simontacchi@unipd.it
authors.forename: C
authors.initials: C
authors.lastname: Simontacchi
authors.forename: T
authors.initials: T
authors.lastname: Perez de Altamirano
authors.forename: L
authors.initials: L
authors.lastname: Marinelli
authors.forename: R
authors.initials: R
authors.lastname: Angeletti
authors.forename: G
authors.initials: G
authors.lastname: Gabai
mesh_terms: D045930:Anabolic Agents / Q000008:administration & dosage / Q000494:pharmacology; D000728:Androgens / Q000008:administration & dosage / Q000494:pharmacology; D000822:Animal Husbandry / Q000331:legislation & jurisprudence / Q000379:methods; D000818:Animals; D002417:Cattle / Q000097:blood*; D003687:Dehydroepiandrosterone / Q000097:blood; D013196:Dihydrotestosterone / Q000097:blood; D004359:Drug Therapy, Combination; D004958:Estradiol / Q000008:administration & dosage / Q000097:blood* / Q000494:pharmacology; D007558:Italy; D008297:Male; D009277:Nandrolone / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology*; D000077603:Nandrolone Decanoate; D012044:Regression Analysis; D013739:Testosterone / Q000008:administration & dosage / Q000097:blood* / Q000494:pharmacology
chemical_list: D045930:Anabolic Agents; D000728:Androgens; D013196:Dihydrotestosterone; D013739:Testosterone; D003687:Dehydroepiandrosterone; D004958:Estradiol; D009277:Nandrolone; D000077603:Nandrolone Decanoate