Reproductive Development of Santa Inês Rams During the First Year of Life: Body and Testis Growth,Testosterone Concentrations,Sperm Parameters,Age at Puberty and Seminal Plasma Proteins     

CEA Souza  AA Araújo  JTA Oliveira  AC Lima Souza  JNM Neiva  AA Moura 《Reproduction in domestic animals》2010,45(4):644-653

We have investigated the reproductive development of the tropically adapted Santa Inês ram, the most common hair sheep in Brazil. From 8 to 48 weeks of age, 16 animals were evaluated for body and testis growth, semen parameters, testosterone concentrations and seminal plasma proteins, using two‐dimensional SDS‐PAGE. Animals were weaned at 30 days and kept in feedlots thereafter, receiving hay, concentrate (18% of crude protein) and mineral supplement. Body weight increased from 12.3 ± 0.7 to 54.3 ± 1.6 kg between 8 and 48 weeks (p < 0.05), but changes in thoracic perimeter and scrotal circumference were non‐significant after 36 weeks (p > 0.05). The percentage of motile sperm increased slowly until 23 weeks and more rapidly after that age, but significant changes in progressive motility occurred after 25 weeks. Presence of abnormal sperm related inversely to age. Most significant changes in sperm concentration occurred between 38 and 44 weeks (0.38 ± 0.05 to 1.14 ± 0.24 × 10⁹ cells/ml, p < 0.05) and testosterone reached its highest concentrations at 42 weeks, decreasing afterwards. Rams reached puberty at 28.2 ± 0.8 weeks. The number of protein spots on seminal plasma gels was similar from 15 to 18 weeks (45 and 47 spots; p > 0.05), increased until 24 weeks (141 spots) and 28 weeks (170 spots; p < 0.05) and remained without significant (p > 0.05) changes from 28 to 48 weeks (186 ± 10 spots). Furthermore, the intensity of selected spots on 2D maps increased (p < 0.05) between 15 and 28 weeks, which preceded or coincided with the main developmental changes in sperm motility and percentage of defective sperm in the ejaculates. These results will support future studies designed to characterize specific seminal plasma proteins whose expression relate to the development of testis, epididymis and accessory sex glands.  相似文献   

Physiology of the Canine Anoestrus and Methods for Manipulation of Its Length     

J. de Gier  NJ Beijerink  HS Kooistra  AC Okkens 《Reproduction in domestic animals》2008,43(S2):157-164

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Molecular characteristics of granulosa and cumulus cells and oocyte competence in Nelore cows with low and high numbers of antral follicles          下载免费PDF全文

CO Rosa  LSR Marinho  PRA da Rosa  MP De Cesaro  PA Lunardelli  KC Silva‐Santos  AC Basso  V Bordignon  MM Seneda 《Reproduction in domestic animals》2018,53(4):921-929

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