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THE STOCKFEEDER'S COMPANION 



162 Ibs. pure butter-fat, while the latter gave fully 

 315 Ibs. Wide differences are to be found, of a similar 

 nature, in all breeds, due to their individual 

 characteristics. 



4. Period of Lactation. This point may be 

 illustrated from the Ayrshire milk records, the keeping 

 of which were supported by a grant from the High- 

 land and Agricultural Society of Scotland. Mr John 

 Spier included the record of every available cow at 

 the time, and obtained the following interesting 

 figures : 



It will be noticed that the yield of milk gradually 

 increased up to the twelfth week. After that, it 

 began to fall off. With regard to the quality, the 

 percentage of fat decreased till the end of the fourth 

 week ; after that the fat gradually increased in propor- 

 tion. 



5. Age of Cow. In the Highland and Agricultural 

 Society's Journal for 1909, Mr Spier, in his report of 

 the Wigtonshire Milk Record Society, makes a tabular 

 statement of the average quantity and quality of milk 

 yielded by all (available) cows, according to their age, 

 which had completed their lactation periods. The 



