EXPERIMENT STATION BULLETINS. 611 



63°C. for fifteen minutes has no effect upon the Bad. abortus antibodies, 

 but is sufficient to destroy all of the abortion bacteria present. 



Heifer calf 999 A, Table 1-1, ^vas fed upon pasteurized naturally in- 

 fected milk for a period of thirteen weeks. The blood reaction was nega- 

 tive before feeding and remained negative throughout the time of feed- 

 ing. No matting of the sexual hairs below the vulva was observed. The 

 dam of calf 999 A was two years old at the time of this parturition. 

 The blood and milk of the cow were negative before and after parturi- 

 tion. 



THE RESULTS OP FEEDING NON-INPECTED MILK. 



Bull calf 1004 A, Table 15, was fed upon non-infected milk for a period 

 of twelve weeks. The blood of the calf gave a positive reaction before 

 feeding milk. The reaction persisted for three weeks. The sexual hairs 

 remained unmatted and unstained during the feeding. The dam of 

 calf 1004 A was eight years old at the time of this parturition. The 

 calf of the second pregnancy was aborted. The milk and blood of the 

 cow were negative before parturition. The blood was negative after 

 parturition. The milk was positive. 



Heifer calves 1005 A, Table 16, and 1006 A, Table 17, were fed upon 

 non-infected milk for a period of twelve weeks. The blood sera of both 

 calves were negative before feeding. They liave continually given a 

 negative reaction. The sexual hairs below the vulvae of the calves re- 

 mained unmatted and unstained. The dam of calf 1005 A was three 

 years old at the time of this parturition. The dam of calf 1006 A was 

 seven years old. The blood and milk of each cow were negative before 

 and after parturition. 



Bull calf 1007 A, Table 18, was fed upon non-infected milk for a period 

 of twelve weeks. The blood sera of the calf was not tested until two 

 weeks after birth. The blood has continually given a negative reaction. 

 The sexual hairs remained unmatted and unstained during the feeding. 

 The dam of calf 1007 A was six years old at the time of this parturition. 

 The calf of the second pregnancy was aborted. The blood and milk of 

 the cow gave negative reactions after parturition. 



Heifer calf 1008 A, Table 19, was allowed to suckle her dam for three 

 days after birth. The calf was then separated and fed upon non-infected 

 milk for twelve wrecks. The blood of the calf gave a positive reaction 

 when the first test was made, 57 days after birth. The positive reaction 

 persisted for five weeks. The sexual hairs remained unmatted and un- 

 stained. The dam of calf 1008 A was three years old at the time of this 

 parturition. The milk and blood gave positive reactions when tested 

 after parturition. The milk of this cow has given a positive reaction 

 for more than eighteen mouths. 



Heifer calf 1009 A, Table 20, was allowed to suckle her dam for three 

 days after birth and then separated. The calf was then fed upon non- 

 infected milk for a period of twelve weeks. The first blood test was 

 made when the calf was seventeen days old. The blood gave a positive 

 reaction which persisted for four weeks. The sexual hairs remained 

 unmatted and unstained. The dam of calf 1009 A was two years old 

 at the time of this parturition. The blood and milk of the cow gave 

 positive reactions before and after parturition. 



