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Oestrus cycle.

"The sow comes into heat every fifteen to seventeen days, and usually one of the signs of this is the sight of her trying to mount her companions."

FOR MORE INFORMATION -- http://www.oginet.com/pgurney/oestrus.htm

"In old age, guinea pig suffer the same ailments that we humans suffer from. Circulatory problems, kidneys not as good as they were when young, creaking joints, failing eye sight etc."

FOR MORE INFORMATION -- http://www.oginet.com/pgurney/oldage.htm

"Accompanying the development of ovarian cysts are hormonal changes which result in hair loss, usually appearing first on the sides."

FOR MORE INFORMATION -- http://www.guinealynx.info/ovarian_cysts.html

"Oxalic Acid May Be Involved In The Production Of Bladder Stones."

FOR INFORMATION & CHART -- http://www.guinealynx.info/diet_oxalic.html