12 



N. H. Agr. Experiment Station 



[Bulletin 291 



Table 4 



Principal factors causing high bacteria counts and distribution of 

 Grade A producers during 1931, 1932, 1933 



Factors causing 



high bacteria counts 1931 



Sterilizing and Equipment — 



Improper methods 57 



Milking machine not washed 4 



Lack of equipment to sterilize 3 



Broken and porous rubber 2 



Wooden plugs in 8-qt. cans 1 



Milk can, dirty, broken seam 



Total 67 



Cooling milk — 



Too slow in cooling below 60° 12 



Tank too small or leaked 5 



Lack of ice in tank 4 



Milk not strained after each cow 2 



Can not in milkhouse during straining. . 2 



Water too low on cans 1 



Milk held over from previous day 1 



Empty icehouse 



Too short time allowed 



Total 27 



Cows — 



Garget 7 



Drying cows and milking once a day. ... 2 



Milking machine injury 4 



Not stripped clean after machine 2 



Milked too soon after freshening 1 



Milked too close before freshening 



Udders not washed 2 



Wet hand milking 1 



Total 19 



Labor problems — 



Shifting of hired help 9 



Proprietor, inconsistent, lazy 4 



Learning how 2 



Sickness and lack of responsibility 1 



Total 16 



Miscellaneous — 



Building burned 



Stable small, contamination 1 



Total 1 



Not located 3 



Grand total 133 



No. producers affected 



1932 



1933 



Ave. 

 per cent 



25 

 2 

 1 

 1 

 1 



30 



29 

 2 



1 

 2 



34 



38% 



23 



18 



20% 



30 



24 



21% 



13% 



1 

 2 



2% 



10 



106 



106 



100% 



