GRANULAR VENEREAL DISEASE AND ABORTION IN CATTLE. 



39 



Table 5. — Chronological order of abortions in cows of herd A from third pregnancy 



onward. 



Number 



of 



pregnancy. 



1899 



1900 



1901 



1902 



1903 



1904 



1905 



1906 



1907 



1908 



1909 



1910 



1911 



Total. 



Third 





1 











4 (4) 

 2 



1(2) 

 2 

 1 







1 



1 

 3(5) 







7 















2(3) 





1(2) 

 1(4) 





8 



Fifth... 







1(2) 













3 



Sixth 





















2 





























1 



Eighth 







1 





















1 



Ninth 



1(10) 

























1 



Tenth 



1(9) 

























1 































Total 



1 



2 



2 









10 



2 





1 



4 



2 





24 













Table 5 shows that when cows abort in their third or later preg- 

 nancy it usually occurs in a storm like that of 1905. Thus, in the 80 

 animals tabulated, 10 abortions, or 41 per cent of all the abortions 

 in third or later pregnancies, covering a period of 22 years, occurred 

 in one year. Fifteen of the 24 abortions occurred during the third 

 and fourth pregnancies, thus indicating strikingly the influence of the 

 age of the animal upon abortion. 



ABORTION RECORD IN HERD B. 



In the following data of herd B the annual rate of abortion increases 

 from the 12 per cent of herd A to 17 per cent. The increase occurs 

 not in adults, but in heifers, and especially in those pregnant for the 

 first time. 



. Summary of abortions in herd B, May, 1909, to December, 1911. 



Total pregnancies 1, 206 



Total abortions 213 



Percentage of abortions 17 



Number aborting but once 167 



Number aborting twice 20 



Number aborting thrice 2 



Total number of cows aborting 189 



Abortions in first pregnancy, 99, or 46.5 per cent of all abortions and 50 per cent of first 



pregnancies. 

 Abortions in second pregnancy, 70, or 33 per cent of all abortions and 34 per cent of 



second pregnancies. 

 Abortions in third pregnancy, 26, or 12 per cent of all abortions. 

 Abortions in fourth or later pregnancy, 18, or 8.5 per cent of all abortions. 



Repeated abortions. 



First and second pregnancy 15 



First, second, and third pregnancy 2 



Second and third pregnancy - 2 



Third and fourth pregnancy 1 



Fourth and fifth pregnancy 1 



Fifth and sixth pregnancy 1 



Total 22 



