March, 1938] Agricultural Research in N. H. 9 



the average solids-not-fat content in the dairy herd milk reached its 

 highest point of 8.91 per cent, for the months of June and October. 



On the other hand, records of other herds that are not fed according 

 to production or that receive little or no grain for a part of the year do 

 not show this relationship. 



Fifteen-day composite samples from various herds throughout the 

 state over the same period show that during the months of July, August, 

 September, October, and November, the solids-not-fat content of the 

 milk is below normal for the fat content. The rest of the year the rela- 

 tion of the fat to solids-not-fat is about normal. About a third of the 

 herd which would be below the Massachusetts State Legal Standard on 

 total solids content would have been placed there by the solids-not-fat. 

 The attempt to apply a "normal" relationship between fat and solids- 

 not-fat shows that about two-thirds of the samples testing 3.4, 3.5, 3.6, 3.7 

 and 3.8 per cent, contained less than the normal amount of solids-not- 

 fat for the fat tests, the percentages below normal being 70, 69, 65. 64, 

 and 62 respectively. The average solids-not-fat content ran from 0.14 

 per cent, to 0.07 per cent, below the normal for the fat test. The aver- 

 age difference from the normal was — 0.11 per cent — the same figure 

 found by the Whiting Co. in a report on samples run in their labora- 

 tories. 



Further observations of the possible effect of mastitis upon total solids 

 in milk were made by H. C. Moore and L. W. Slanetz. Samples from 

 six cows in the University herd that all freshened within a month of one 

 another, showed three negative to mastitis and three positively infected 

 in one or more quarters. The mastitis cows showed +.17 more per cent, 

 fat and — .53 per cent, less solids-not-fat than the clean cows. 



A paper on the methods used in taking the samples directly from the 

 combine jar was given at the annual meeting of the American Dairy 

 Science Association at Lincoln, Nebraska. {Purnell Fund) 



Cod Liver Oil Helps Calves 



Further indication that cod liver oil, supplementing skim milk, will 

 promote satisfactory growth of calves was obtained by K. S. Morrow. 

 A group of two Holsteins, one Jersey and one Ayrshire calf was fed as 

 follows : 



Calf left with dam for 12 hours. Dam's milk fed for first three days. 

 Beginning with the fourth day, skim milk plus cod liver oil concentrate 

 (added at rate of one teaspoonful per day) was fed. At beginning of 

 third week cod liver oil concentrate increased to two teaspoonfuls per 

 day. 



All milk was fed at the rate of 1.2 pounds of milk daily for each ten 

 pounds live weight of animal up to a maximum of 18 pounds daily. 



Grain was started as soon as the calf would eat it. fed up to limit of 

 appetite, not to exceed four pounds per day. It consisted of a ration of 

 cornmeal, 400 pounds; wheat bran, 300 pounds; ground oats, 200 

 pounds; linseed oil meal, 100 pounds; cottonseed oil meal. 100 pounds; 

 salt, 12 pounds ; bone meal, 12 pounds and cod liver oil concentrate 

 added at rate of five pounds per ton. 



Compared with last year's rations, the present rate of milk feeding 



