Ultrasound biometry for estimating delivery dates in small and medium breed cats.

This research investigated the development of fetal and feto-maternal structures and their correlation to the time leading up to parturition during pregnancy in small and medium breeds of domestic cats. The experiment involved 53 purebred queens assigned to two groups based on their weight. Ultrasound examinations were performed weekly from the 15th day after the last mating until delivery.

Factors determining semen sample collection and semen quality parameters in African penguins Spheniscus demersus.

Our research focuses on semen collection from 42 African penguin males, grouped by age, habituation levels, and reproductive season timing. We assess behavioral and physiological responses to dorso-abdominal massage, evaluating species-specific seminal traits using conventional and advanced methods. Positive behavioral responses corresponded with successful semen collection.

The effect of resveratrol on the developmental competence of feline oocytes vitrified at the metaphase II stage.

The objective of this research was to assess the viability and developmental potential of feline oocytes following in vitro maturation (IVM), vitrification, and post-warming incubation with resveratrol. In the first experiment, warmed oocytes were incubated with 0.2 μM, 2 μM, or 20 μM resveratrol for 2 h.

In search of freezability predictors for feline spermatozoa - osmotic challenge tests and markers of sperm membrane structure.

Semen cryopreservation is a crucial part of assisted reproductive techniques (ART) in animals, and recently it is gaining more and more attention among cat breeders. Even if fresh semen quality is good, sometimes spermatozoa do not survive freezing. The freezability prediction was widely studied in many species, but not in the domestic cat.

Flavone and 3-hydroxyflavone supplementation in cryopreservation medium protects canine sperm against apoptosis and lipid peroxidation.

Cryopreservation is a pivotal technique in safeguarding genetic material across diverse species, despite its inherent challenges linked to induced spermatozoa damage, notably apoptosis and lipid peroxidation (LPO). Given the insufficient antioxidant defense of spermatozoa against LPO, there is a rising interest in integrating additional additives into extenders to ameliorate mammalian semen quality. Among these additives, flavonoids have garnered considerable attention due to their potent antioxidative properties.