GROWTH OF FETUS 



173 



At about the 13th day after insemination the fetus is large 

 enough to be directly weighed and from this date to birth the 

 growth has been followed. 



TABLE 118 

 Showing the viean iceights of the fetuses at ten ages during gestation and at birth 



Siotsenburg {'15) 



TABLE 119 

 Giving the crown-rump length of fetus in millimeters. Scrap diet only, 

 uses here measured are part of those used for Table 118 



The fet- 



SERIAL NUMBER 



42, 

 43. 

 37. 

 41 

 40. 

 36, 

 37, 

 35, 

 34, 

 44 



AVERAGE 

 WEIGHT 

 OF FETUS 



grams 



0.093 

 0.107 

 0.218 

 0.322 

 0.525 

 0.947 

 1.490 

 2.510 

 4.070 

 4.630 



AVERAGE 

 CROWN- 

 RUMP 

 LENGTH 



9.5 

 9.4 

 12.1 

 13.0 

 16.3 

 19.1 

 22.7 

 27.7 

 36.7 

 39.2 



RANGE OP 

 LENGTH 



9.0-10.0 

 9.0-10.0 

 12.0-12.5 

 12.5-13.0 

 16.0-17.0 

 18.0-21.0 

 20.5-24.0 

 24.0-32.0 

 35.0-39.0 

 36.0-41.0* 



* This method of measurement gives a less length than the nose-anus method 

 commonly used for the new born. 



■ In a series of 38 females, each of which had already born one 

 litter, Stotsenburg ('15) has observed exactly the time of 

 insemination and then weighed the fetuses at the ages given in 



