82 THE CONNECTICUT AGRICULTURAL 



The only embarrassment which these tests do not relieve us 

 from, is that occasioned by the natural variations in the composi- 

 tion of milk. The limit of such variation is discussed in the 

 pages that follow. 



Analyses of Guernsey Milk. 



In the table on page 82 are given analyses of the milk of single 

 Guernsey cows of pure breed, owned by Mr, E. Norton of Farm- 

 ington, Secretary of the American Guernsey Cattle Club. The 

 samples were drawn from the morning's milk. The cows wei'e 

 milked twice daily, morning and evening, between five and six 

 o'clock. 



For comparison, the average of these analyses is given below, 

 with the averages of some milk analyses made at the New Jersey 

 Experiment, Station in 1880, by the same method which has 

 been employed here. (See the New Jersey Station Report for 

 1880, p. 59). In the case of each New Jersey herd, 13 analyses 

 were made on as many consecutive days. 



Made at thb New Jersey Station. 



t N 



Guernsey. Jersey. Ayrshire. Native. 



6 Cows. 6 Cows. 5 Cows. 6 Cows. 



Water, 85.20 85.28 87.15 86.43 



Solids, 14.80 14.72 12.85 13.57 



Casein, 4.08* 3.67 3.20 3.34 



Fat, 5.23 5.21 4.33 4.49 



Sugar, .._ 4.50* 4.93 4.60 4.82 



Ash, 1.17* .91 .72 .92 



• Daily yield per head, 21 lbs. 3 oz. 21 lbs. 4 oz. 22 lbs. 9 oz. 



* 10 analyses. 



The yield of the Guernsey cows is not known. 



The cows of the Ayrshire herd had not been quite so long in 

 milk as the natives. The Jerseys had been longer in milk than 

 either of them. 



These figures are here given simply as a contribution to our 

 knowledge of the chemical composition of cows' milk, as afiected 

 by the breed. A few results like these, taken by themselves, proye 

 very little with regard to this point. In the first instance varia- 

 tions in the chemical composition of milk, like diiferences in the 

 milk yield, are individual peculiarities. By breeding, such dif- 

 ferences have, to a greater or less degree, been made permanent 

 and constant ; but even within the same breed we still find large 



