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Effects Of An Anabolic Treatment Before Puberty With Trenbolone Acetate-Oestradiol Or Estradiol Alone On Growth-Rate, Testicular Development And Luteinizing-Hormone And Testosterone Plasma-Concentrations
Renaville, Robert; Burny, Arsène; Sneyers, Myriam et al.
1988In Theriogenology, 29 (2), p. 461-476
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Keywords :
Bulls; Anabolics; Oestrogens; Therapy; Animal developmental stages; Testes; LH; Testosterone; Blood plasma; Taureau; Anabolisant; Oestrogènes; Thérapie; Stade de développement animal; Testicule; Testostérone; Plasma sanguin
Abstract :
[en] Scrotal circumference, growth and hormonal status after prepubertal anabolic treatments were studied in 18 conventional Belgian White Blue bulls from 3 to 13 mo of age. Young bulls were assigned into three groups: six untreated (control) bulls, six bulls implanted with 140 mg trenbolone acetate + 20 mg oestradiol (Revalor; TBA-E2) and six bulls treated with 45 mg oestradiol (Compudose; E2). Mean scrotal circumference was similar in the three groups at Day O (between 13.0 ± 0.3 cm to 13.4 ± 0.7 cm). From Days O to 230, scrotal circumference was strongly inhibited in implanted bulls, 23.2 ± 1.4, 21.7 ± 1.0 cm, respectively, for TBA-E2 and E2 at Day 210, as compared with 29.5 ± 2.2 cm in control bulls (P < 0.001). Afterwards, differences lessened gradually and no significant divergence was observed between the three groups from Day 310. Average plasma luteinizing hormone (LH) concentrations were similar in the three groups throughout the assay. Mean testosterone levels remained extremely low upto Day 150 in TBA-E2 and E2 groups (0.6 ± 0.6, 1.2 ± 0.7 ng/ml, respectively) before they increased abruptly and reached values observed in control bulls at Day 180 (4.0 ± 1.9 ng/ml). The pulsatil character of LH and testosterone profiles was abolished by the anabolic treatments. Luteinizing hormone-releasing hormone (LHRH) injection was followed by an immediate and sharp increase in plasma LH concentrations in all groups at Day 0. Anabolic treatments strongly reduced LH and testosterone responses to LHRH in treated groups.
Disciplines :
Anatomy (cytology, histology, embryology...) & physiology
Animal production & animal husbandry
Author, co-author :
Renaville, Robert ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Burny, Arsène ;  Université de Liège - ULiège > Agro Biotech Gembloux
Sneyers, Myriam;  Faculté Universitaire des Sciences Agronomiques de Gembloux - FUSAGx
Rochart, Serge;  Faculté Universitaire des Sciences Agronomiques de Gembloux - FUSAGx
Portetelle, Daniel ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Thewis, André ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Language :
English
Title :
Effects Of An Anabolic Treatment Before Puberty With Trenbolone Acetate-Oestradiol Or Estradiol Alone On Growth-Rate, Testicular Development And Luteinizing-Hormone And Testosterone Plasma-Concentrations
Publication date :
February 1988
Journal title :
Theriogenology
ISSN :
0093-691X
eISSN :
1879-3231
Publisher :
Elsevier, New York, United States - New York
Volume :
29
Issue :
2
Pages :
461-476
461-476
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 September 2009

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