The development of assisted reproductive technologies (ART) arises from the need to improve reproductive conditions, ensuring births in humans. Progress in this area of research has enabled the possibility of sperm selection with adequate morphological characteristics to ensure fertilization, embryo development, pregnancy and birth. However, further studies are required to increase reproductive...

The ovarian histology, the structural and the ultrastructural characteristics of the folliculogenesis in Didelphis albiventris were described in detail. Recent studies suggest that methatherian mammals have unusual reproductive cycle but there are few informations regarding the marsupials reproductive life. Despite of the opossum folliculogenesis pattern resembles methatherian and eutherian pat...

The study observed the characteristics and assessed abnormalities in reproductive tracts of repeat breeders cattle. Fourty (40) herds were sampled during fifty seven (57) identified. animals had normal with good body condition scores (BCS) ranging from 2.5- 4.5. There was no correlation between ages (r = -0.4576. Higher number found within 3 -6. Variation not significantly associated. Physical ...

the survival, growth, reproductive and life span characteristics of phallocryptus spinosa were studied at different temperatures in the laboratory. three replicates of 200 newly hatched nauplii were transferred to culture containers at 15, 20, 25 and 30˚c. the larvae were fed with unicellular algae dunaliella tertiolecta and chemically treated yeast known as lansy pz. survival and growth rate o...

The reproductive success of sibling cocklebur plants (Compositae: Xunthium strumarium) was monitored after growth at different levels of availability of water and nutrient resources. Variation in reproductive success among individual plants was related to physiological, structural, and phenological characteristics. Reproductive success increased with increased availability of resources, but the...