| [studies of the etiology of infectious abortion in cows in ruse district]. | a total of 28,159 blood serum samples have been examined for brucellosis, 87--for leptospirosis, 84--for toxoplasmosis, 554--for the presence of rickettsii and neoreckettsii, and 193--for total protein content, albumin, and protein fractions, taken from cows in the course of the years on 40 dairy farms in the district of rousse. bacteriologically were examined 349 aborted fetuses, 178 samples of estral secretion, 57 placentae, and 1002 samples of washings and seminal fluid from bulls for vibrios ... | 1977 | 562030 |