While most lizard species are polygamous, dominant males typically have greater access to females and copulate more frequently than submissive ones. Several studies suggest that applying assisted reproduction techniques this taxon could be an effective tool enhance conservation programs. Therefore, the proper selection of for breeding programs is crucial their overall success. In study, we report first time data on semen sperm quality from Mexican Sceloporus torquatus using commonly employed...

Ovarian follicular development and ovulation were studied by ultrasound scanning in the Mexican viviparous lizard Barisia imbricata. A linear unit with variable capacity from 5 to 10 MHz was used. Vitellogenic follicle diameters ranged 3.3 9.8 mm present lizards between September December. Also, corpora lutea uterine eggs identified. The is an excellent non-invasive technique determine seasonal reproductive changes can be combined other techniques monitor process.

Sperm capacitation involves biochemical and physiological changes that enable sperm to fertilize the oocyte. It can be induced in vitro under controlled conditions simulate environment of oviduct. While extensively studied mammals, its approach lizards remains absent. Understanding mechanisms facilitate reproduction is essential for advancing implementation assisted reproductive technologies this group. Fifteen males Sceloporus torquatus were collected during early stage season. The isolated...

SUMMARY The sexual development of saurians follows a similar pattern to that described for other amniotes. Changes in the timing or sequence events are known as heterochrony. We describe viviparous Mexican lizard Barisia imbricata and report heterochrony regression hemipenes this lizard. collected gestating females; some lizards were subjected partial hysterectomy embryos processed using routine histological technique assess gonadal development; remaining used hemipenes. Other pregnant...

The authors declare that there are no conflict of interests.

The aim of this study was to develop a non-invasive procedure stimulate ejaculation in median and small lizards for semen collection. After collection, we applied battery tests assess the motility (wave progressive), viability (eosin-nigrosin stain), morphology (normal/abnormal), sperm concentration ejaculate number, seminal volume colour. We obtained fluid from all males four species sceloporine (n = 30) one Mexican horned 7). found that had liquid-like consistency milky-white appearance....

Several studies have shown that the corpus luteum is principal source of progesterone during gravidity period in reptiles; however, its participation maintenance gestation viviparous squamata dispute. The effects ovariectomy or luteectomy vary according to species and time at which procedure performed. In this paper, we describe early pregnancy on concentrations temperate Mexican lizard Barisia imbricata imbricata. Twenty-four lizards were subjected three different treatments: luteectomy,...

Abstract The present study describes the morphology and ultrastructural features of postnatal follicular development in volcano mouse ( Neotomodon alstoni ), an endemic Mexican rodent. By first week age, germ cells were organized clusters within ovigerous cords, only 51.8% them associated with somatic cells. At level, pairing chromosomes cellular junctions between pregranulosa cells, such as desmosomes, observed. this time, zona pellucida could not be detected formed follicles. From 15 to 28...

To relate the histological characteristics and histochemical Δ5−4-isomerase-3 beta hydroxy steroid dehydrogenase (Δ5−43β-HSD) activity of corpora lutea (CL) atresic vitellogenic follicles (AVF) with progesterone (P4) plasma concentrations in three different times gestation (early, medium late) viviparous lizard Sceloporus mucronatus (S. mucronatus). The as well Δ5−43β-HSD CL AVF their relationship P4 levels were studied during pregnancy S. mucronatus. Corpora develops first third gestation....

Abstract Actual loss of lizard biodiversity continues, even with the implementation conventional conservation programs. An approach including assisted reproductive techniques such as sperm cryopreservation may contribute to management endangered species. We developed a method for in sceloporine lizards and compared response among studied Prior mating season, we obtained semen from adult males Sceloporus aeneus (n = 21), grammicus 20) torquatus 21) via pressure genital papilla. Volume...

Las hembras de muchas especies lagartijas tienen la capacidad almacenar espermatozoides en un sistema túbulos especiales presentes vagina. Sin embargo, otras los se almacenan el infundíbulo. Se utilizó una técnica sencilla y rápida para determinar sí vagina Sceloporus torquatus tiene espermatozoides. En las esta especie, son retenidos al menos 167 días localizados La cantidad lavados vaginales disminuyó gradualmente a partir diciembre su desaparición ocurrió preñez tardía. Los ascienden...

Sperm capacitation involves biochemical and physiological changes that enable sperm to fertilize the oocyte. It can be induced in vitro under controlled conditions simulate environment of oviduct. While extensively studied mammals, its approach lizards remains absent. Understanding mechanisms ensure reproduction is essential for advancing implementation assisted reproductive technologies this group. We aimed perform a analysis determine if capacitation-related were after incubation with...

Estradiol and progesterone have been recognized as important mediators of reproductive events in the female mainly via binding to their receptors. This study aimed characterize immunolocalization estrogen receptor alfa (ERα), beta (ERβ) (PR) ovarian follicles lizard Sceloporus torquatus. The localization steroid receptors has a spatio-temporal pattern that depends on stage follicular development. immunostaining intensity three was high pyriform cells cortex oocyte previtellogenic follicles....