Under laboratory conditions male sexual behavior usually is analyzed using a standard arena (SA), consisting of a rectangular or cylindrical chamber, in which a male rat is paired with a receptive female (RECF). However in previous studies, it has been shown that sexual behavior in rat can be modified when...
Epididymal sperm maturation is the process of mammalian spermatozoa, in which they acquire their ability to fertilize the egg after its transit through the epididymis. This transit is not passive, the spermatozoids undergo morphophysiological and biochemical changes, which are responsible for acquiring the characteristics necessary to fertilize. For many decades...
The objective of this research was to determine the capacitation indicators and acrosome reaction in sperm of Harris hawk (Parabuteo unicinctus) in freshly ejaculates and cryopreserved with dimethylsulfoxide (DMSO) and glicerol, as well as the parameters of viability, motility and morphology in each treatment. Heterologous perivitelline layer was implemented as...
This study was designed to evaluate the efficiency of bovine embryo vitrification in the morula stage, using Ethylene Glycol (EG) and trehalose in the beveled straw (beveled edge straw; BES) and its effects in viability and development potential after devitrification. For embryo production in vitro (IVP) ovaries were collected at...
The Oocyte have the inherent ability to reprogram the sperm nucleus to form an embryo, which result in a new organism; nevertheless, also it has the ability to reprogram the nucleus of differentiated somatic cell, as it has been shown in Somatic Cell Nuclear Transfer (SCNT). Cytoplasmic extracts of Germinal...
El actual conocimiento de la distribución y abundancia del grupo de peces pertenecientes a la familia Lutjanidae, conocidos como pargos, en diversos cuerpos acuáticos parece ser incompleto. Entre los cuerpos acuáticos en que habitan los pargos están las lagunas costeras, ecosistemas que utilizan para la crianza y el reabastecimiento de...
In the present study two different rooms within an anthropogenic building, used as shelters by the species of bats Myotis velifer and Taidarida brasiliensis, were characterized to determine whether there are differences in environmental conditions that indicate preferences in the selection of shelters by these species. This construction is located...
En las hembras hámster Sirio Dorado (Mesocricetus auratus) el número promedio de ovocitos ovulados es de 10, los cuales tienen una vida fértil máxima de 13 horas. En hembras jóvenes (de 2 a 5 meses de edad), los ovocitos ovulados permanecen alrededor de 96 horas en el oviducto, donde envejecen...
Infertility in males is a problem that has increased, mainly due to pathological alterations. However, 34-40% of cases are due to idiopathic infertility, related to exposure to toxic agents in the environment such as cadmium (Cd), a heavy metal derived from anthropogenic activities. Cd is linked to a decrease in...
Inflammation is an adaptative response, triggered by various harmful stimuli, its aim is to eliminate injurious agents, as well as the restoration and normal functioning of the affected tissue or organ. However, this response can be altered and produce permanent damage, which often have pathological consequences, like cardiovascular, respiratory, digestive...
