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| NOGUEIRA,Guilherme de Paula; BARNABE,Renato Campanarut; MOREIRA,Alankardson Ferreira; VERRESCHI,Ieda Terezinha do Nascimento. |
| Sexual maturation involves restraint of gonadal activity from birth to puberty, while somatic development continues. Fetal gonadal steroidogenesis is very important for the maintenance of pregnancy and foaling in mares. The present study was conducted to evaluate gonadal steroid serum levels in foals after birth. Five fillies born at Equília Stud Farm, Avaré, SP, Brazil, were studied. Blood samples were collected daily in the morning during the first week of life. Progesterone serum levels were measured by a commercial radioimmunoassay (RIA) kit and estradiol serum levels with a sensitized non-commercial RIA. At birth, both progesterone and estradiol serum levels were high (13.46 ± 5.5 nmol/l and 7.95 ± 1.5 nmol/l) and decreased to undetectable levels at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fillies; Steroids; Birth. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95962000000400008 |
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| MORATO,Ronaldo Gonçalves; GUIMARÃES,Marcelo Alcindo Barros de Vaz; FERREIRA,Fernando; VERRESCHI,Ieda Terezinha do Nascimento; BARNABE,Renato Campanarut. |
| Ejaculate traits, testicular volume and plasma testosterone levels were determined once every two months for one year in 4 adult male jaguars (Panthera onca) housed at the São Paulo Zoo, SP, Brazil. Semen samples was collected by electroejaculation and analyzed for pH, total volume, motility (0-100%), status (0-5), total spermatozoa count and morphology. Blood samples was obtained by cephalic venipuncture immediately before the onset of electroejaculation and stored at -20ºC until assay of testosterone by RIA. Using a calliper, the length and width of each testis was measured and the values were combined to determine the testicular volume. Semen analyses demonstrated a high percentage of structurally abnormal sperm (mean = 51%) and low rates of motility... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Jaguars; Semen characters; Testosterone; Season. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95961999000500008 |
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