Breeding and reproduction in rats can decrease because of factors such as age, malnutrition, abnormal light cycles, cold environment, cysts on the ovaries, tumors, and inadequate nesting material. Do not force them to do so in captivity. Do not try to mix and match, seeing which your snake prefers. there is no breeding season for rats. Rats are larger than mice and will bully and intimidate them. It weighs between 140 and 500 g (5 and 17 3 ⁄ 4 oz). Breeding Your Rats - A Guide. Choose whether you are breeding rats or mice. Rats lighter than this may become very underweight while nursing their litters. Mice also take only three weeks to reach sexual maturity so those babies can also contribute 60 … These two species rarely live together in the wild. Rat's are able to reproduce at only 6 weeks, but it is not recommended as the rat is still growing. A single female and her descendants can produce 2,000 offspring in a single year if breeding is unchecked and predation is low. A good weight for a four month old doe who is ready to breed is about 300-400g. females come into heat every 5 - 6 days, unless they're pregnant, and even then they may come into heat a few times early into pregnancy. Breeding and reproduction in rats can decrease because of factors such as age, malnutrition, abnormal light cycles, cold environment, cysts on the ovaries, tumors, and inadequate nesting material. they don't recognize incest, so there's breeding between mothers and sons and all that jazz. Last update: Nov 17, 2020 1 answer. Rats who have had previous litters will probably be heavier than however due to the fact that as I have already said, does who have had … The brown rat (Rattus norvegicus), also known as the common rat, street rat, sewer rat, wharf rat, Hanover rat, Norway rat, Norwegian rat, or Parisian rat is a widespread species of common rat.One of the largest muroids, it is a brown or grey rodent with a head and body length of up to 28 cm (11 in) long, and a tail slightly shorter than that. Rats are well-known for their reproductive proliferation. During warmer months, mice and rats breed seemingly non-stop. This may not seem like a huge problem until you realize each mouse can have up to 60 babies per year; rats can have up to 24. Post by Primrose » Mon Dec 06, 2010 2:32 pm I've just spent an interesting half hour watching wildlife activity in our garden, and various skirmishes which have taken place around the ground feeding tray, which I'm going to have to remove. 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