New York Agricultural Experiment Station. 129 



Gerty F. 3 (No. 13) aborted her first calf on May 5, 1909. Other 

 calvings have been normal. 



Hammond F. 2 (No. 16) had an attack of so-called " spider in 

 the teat " in her right hind quarter during her 1912-13 lactation 

 period. 



Mabel S. F. (No. 17) aborted' her first calf on September 10, 1907. 

 This was followed by two normal calvings, after whicn ako aborted 

 again (October 28, 1910). This accounts for the two calvings 

 reported for 1910. She continued to give a small amount of milk 

 until the end of May when she was dried off and sold. 



Millie of Geneva (No. 19) suffered from so-called " spider in the 

 teat " in her left hind quarter in her 1910 lactation period, thereby 

 causing her poor record for that year. The teat healed but was 

 thereafter difficult to milk because of a partial obstruction of the 

 duct. See pp. 157-160. 



Millie F. (No. 20) met with an accident during her 1910 lactation 

 period, which caused her to abort at eight months (November 23, 

 1910). She was seriously sick at the time but recovered and is now 

 one of the best cows in the herd. 



Ruth F. (No. 24) suffered from milk fever in June, 1911. 



Ruth F. B. B. (No. 25) aborted her first calf at eight months in 

 1911 and was sold soon after. See pp. 152-153. 



In addition to the studies made of the animals in the Station 

 herd, a single examination was made of the milk of each of the 

 animals in a herd of 53 registered Guernseys owned by Mr. A. G. 

 Lewis of Geneva. Records of this herd are given on pages 134-5. 

 Table XII in Technical Bulletin No. 27 of the Station gives a 

 record of the kinds of bacteria present in the udders of the same 

 cows. 



METHOD USED IN THE EXAMINATION OF THE MILK. 



The method used in counting the cells was the direct microscopical 

 method first suggested for this purpose by Prescott and Breed 39 

 and later used by Breed 40 for counting bacteria in milk. The tech- 

 nique of this method as carried out in this work has been practically 

 the same as that used in the earlier investigations. 



•• See footnote 25. 



40 Breed, R. S. The determination of the number of bacteria in milk by direct 

 microscopical examination. Centbl. Bakt., Abt. II, 30 : 337-349, 1911. 



