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You can breed rats by simply putting a pair together for 10 days, insuring they are together through two heat cycles. But since the female might fight the male, a better way is to put the pair together only when the female is in heat. This works especially well if you are breeding your rat to one who belongs to someone else because the pair only has to be together for one evening.

When a rat is in heat her vagina will gape open; otherwise it is tightly closed. Usually there will be behavioral signs too. Stroking her back will usually cause a rat in heat to perform the mating 'dance' which is quite interesting. She may first dart forward or spin around, then she will brace her legs stiffly, lift her head and tail, and vibrate her ears! This display tells the male she is ready for mating.

Most males will be interested immediately and will sniff and perhaps lick her. When mounting he will grasp her scruff with his teeth. During the courtship, mounting will occur numerous times, but most of this is foreplay. Usually the male must mount many times before completing the act, and mating will continue for some time. However, it is possible for a female to get pregnant from a single mounting, so do not let your girls and boys play together if you do not want them to mate. Even if the female is not in heat, a determined and persistent male can sometimes stimulate her into coming into heat, so keep your unneutered males and females separate! Females in heat will sometimes also escape their cage to visit a male.

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14y ago

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