Data/hora: 13/06/2024 21:29:53

Provedor de dados: | 56
País: | Brazil
Título: | Reproductive ability of pubertal male and female rats
Autores: | Zemunik,T.; Peruzovic,M.; Capkun,V.; Zekan,L.; Tomic,S.; Milkovic,K.
Data: | 2003-07-01
Ano: | 2003
Palavras-chave: | Puberty; Reproduction; Gonads; Sex hormones; Pregnancy.
Resumo: | Ten Fisher rats 50 to 55 days of age made up the pubertal group, and ten rats 90 to 95 days of age served as the controls. The testicular and epididymal weights and volumes of the pubertal males were lower than those of the controls (P&lt;0.001). There was also a difference in relative epididymal weight (P&lt;0.001). The sperm of pubertal males was morphologically abnormal in 58.2% of cases, as opposed to only 3.8% in the controls (P&lt;0.001). The mean number of spermatozoa in the control group was 11.9 × 10(6)/ml and their viability was 99.6%, while these values could not be determined for pubertal rats. Serum testosterone was higher in the pubertal animals than in the controls (2.52 ± 1.46 vs 0.92 ± 0.34 nM, P&lt;0.01). The ovaries of control females were heavier than those of pubertal females (P&lt;0.001) but there was no difference in their relative weights. Serum estradiol was similar in both groups (75.5 ± 12.8 vs 81.8 ± 14.7 nM, P&gt;0.05). At the beginning of gestation, the pubertal dams weighed less than the controls (P&lt;0.001) but following uterectomy the body weights were equal. Pubertal dams delivered fewer pups than the controls (8.1 ± 2.5 vs 10.4 ± 1.3, P&lt;0.05). There was no difference in the body weights of their offspring or in the weights of their placentas. The results suggest that, in contrast to their female counterparts, pubertal male rats are not fully mature and have not reached complete reproductive capacity at 50-55 days of age.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000700007
Editor: | Associação Brasileira de Divulgação Científica
Relação: | 10.1590/S0100-879X2003000700007
Formato: | text/html
Fonte: | Brazilian Journal of Medical and Biological Research  v.36 n.7 2003
Fonte: | info:eu-repo/semantics/openAccess