Inability to Reproduce in Cats
 
Normal fertility in a cat, and the ability to reproduce kittens, requires a normal estrous cycle, with a healthy reproductive tract, normal ova (eggs), normal and stable levels of reproductive hormones, fertilization by normal spermatozoa, implantation of an embryo in the lining of the uterus (endometrium), normal placenta placement, and stable levels of progesterone concentration. These conditions must be maintained for the entirety of the two month gestational period, or the process of reproduction will be altered, with resultant infertility.
 
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