1 There is no proof that tertiary hypothyroidism occurs in the dog...primarily because there is no reliable assay for measuring circulating TRH (nor TSH). 2  Thus, the possibility is there...and clinical signs and histological appearance of the thyroid would parallel those described for secondary hypothyroidism.
Rats are very easy to breed. In fact, many people end up with unplanned baby rats! Rats can reach sexual maturity at 5 weeks of age, so the sexes should be separated at this age.Rats donât recognize incest, so brothers and sisters and even mothers and sons must be separated.ats are very easy to breed. In fact, many people end up with unplanned baby rats! Rats can reach sexual maturity at 5 weeks of age, so the sexes should be separated at this age. Rats donât recognize incest, so brothers and sisters and even mothers and sons must be separated.
The best age to obtain your future pet is at the age of 5â8 weeks (mice), 6â9 weeks (rats) (females older then 6 weeks may be pregnant if housed in community cages) so they grow up with you. The average life span of rats is 2â3 years; mice 1â2 years. The average body length of adult rats is 9â11 inches; mice 3â4 inches; with an average tail length of 7â9 inches in rats and 3â4 inches in mice. The average body weight for rats is 350â450 grams for a female, 450â650 grams for a male; mice 30 grams each sex. There have been a few adult male rats that weighed 2 pounds! Meeting the basic needs of a pet rat or mouse is neither complicated, time consuming nor expensive.