Sheaths also swell as a result of being dirty.. Horses with large beans (accumulations of secretions at the end of the penis) and large accumulations of sheath smegma (normal pasty secretion) often swell. Horses that urinate into their sheaths tend to have dirtier sheaths and more problems with swelling.
Some people think Alaska has less sunlight than other places. The opposite is true. Averaged over an entire year, Alaska gets 10-17 minutes more daylight per day than the rest of the country. If you include civil twilight, Alaska gets 40 minutes more light on average than the rest of the country.
At about the tenth day of life, the newborn regains the lost weight and starts to gain about 28 grams per day. Although the mass of the newborn's brain is about 25% of its final adult brain mass, the mass of the newborn's body is only about 5% of its adult mass. Obviously, a newborn's mass increases with age.