Nitisha Nayan & Arun Kumar*
P.G. Department of Zoology, B.N.M.U. Madhepura, Bihar, India
Received : 04th December, 2019 ; Revised : 27th February, 2020
Abstract: The laboratory rat is favoured for experiment during to its moderate size, extravagant reproduction & adaptation that is traceable. Change in diets has taught us about the nutritional requirements of rats & the diseases or effects which are caused by deficiency of these nutrition. Investigators monitor the weight gain & reproductive relation. Among the different strains of rat used reproductive characteristics such as onset of reproductive maturity, fertility, litter size, preweaning mortality vary considerably
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