| Summary: | Zighty fivo hods of white rates ( ~ a t t u sra ttus) were ~ ~ e d to study on'tho growth &nd reproduction porform~nco. First mating in r ~ r n l ci s at 11 woclcs of age/l80 - 220 g of body weight. The averago period of estrous is 8 days, gastation period is 21 dEqfs. first birth is at Idr wooks of ago and tho intorval is 58 &s for young and 82 days far old fcnaloa. Littor size 'and birth wef&t axe 4.5 + 1.9 hods and 5.4-1 + 1.03 g for old male X old female3 7. 0 2 1 4 ~ Q J ~ S - ~4.I49I ~2 0.46 g fo; old malo x young fomale j and 6. 8 -+ 2.7 heads and 4.81 + 0.51 g for young malo X young fomale. Overall mean of birth weight Ts 4.99 + 0.80 g and that of l i t t o r size is 6.0 2.4 haads, Sex ratio (malo P-fomale) from 16 tinos of birth is 155 : 100. We- weight is 31.6 - + 6.9 g at 28 days of age. Young has no hair. Skin is pink in colour, Ems and eyo are oloso at birth. Ba,rs mo open at 11 wooks and eyes are a t 14.75. f 0.96 da;ys of Youngs loam tho cage a t 18.00 + 1.41 of age. Tho growth curve shows that the infl~xion is roachod at 76.72 g of body might (at 6 weeks of ago). For tho aocoleratd owth, the bi1-Y gain i s 1.71 2 0.78 g. Tho curve is wt = 5.3361 00007%. For deooo~exata3g rowth tho dail gain is -2.30 + 0.40 go Tho cum0 is ' (284 - Y 3 = 466.~6b~e4 eo18te Relafivc gr&-tl~ (OW) decreases 2.43
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