Ultrasonographic observation in combination with progesterone monitoring for detection of ovulation in Labrador Retrievers.

Although it is well known that the ovulation occurs during a period of time after LH surge in dogs, there are few reports of observing the entire process of development, ovulation and luteinization of each follicle. This study aimed to detect the ovulation kinetics by ultrasonography in combination with progesterone monitoring and therefore identify the time-range of the ovulation process in a dog. Daily transabdominal ultrasonography and progesterone monitoring were conducted for 24 natural oestrus cycles of Labrador Retrievers.

Induction of oestrus by administering Inhibin antiserum along with equine chorionic gonadotropin in anoestrous bitches.

As dogs experience oestrus only once or twice a year, it is necessary to establish an effective method of oestrous induction for efficient breeding. In the present study, we evaluated inhibin antiserum (IAS) on oestrous induction in anoestrous females. Bitches were administered 0.

Effect of quercetin on the motility of cryopreserved canine spermatozoa.

The addition of an antioxidant to cryopreservation solutions for preventing oxidative stress to sperm from several species, including that from humans, has been studied previously. Quercetin is a flavonoid contained in subarctic trees with freeze resistance and is known to be a strong antioxidant. Therefore, the effect of quercetin on the cryopreservation of dog spermatozoa was examined in this study.

Thermodynamic Stability Analysis of Microbubbles Confined in a Liquid Droplet.

A thermodynamic stability analysis of microbubbles in an enclosed volume of a volatile liquid-noncondensable gas solution was performed. The stability conditions for the formation of the bubbles and the relationship between the equilibrium bubble radius and the equilibrium bubble number were investigated. The calculation results show that even if the saturation vapor pressure of a volatile liquid is higher than the pressure of the liquid phase, stable noncondensable gas bubbles appear in a closed system.