- 542 - 



3. There is no difficulty, much less impossibility, in producing 

 milk in freely ventilated byres in the coldest weather likely to be 

 met with in Great Britain, if the cows are freely ventilated and 

 kept sufficiently cool in early autumn. 



4. While the reported experiment shows that rather more milk 

 had been produced under conditions of free ventilation than where 

 ventilation was restricted, it would be injudicious, till these results 

 have been corroborated by other trials, to consider that this will 

 invariably happen. It is unquestionable that the general health of 

 the cows would be better under free than under restricted ventilation. 



5. Milk produced in a building kept at a high temperature, or 

 during a warm period, does not seem to be any richer in fat than 

 that produced at a low temperature or during cold weather. 



6. It seems hopeless to expect to be able to keep the air of 

 any byre, no matter how the byre may be constructed, at from 

 60 F. to 63 F. during the ordinary weather of an average winter 

 without excessive pollution of the air. 



7. While the effect of a high or low temperature is probably 

 felt by animals almost instantaneously, and very likely produce its 

 results at once, we have little information indicating how long a 

 cow may breathe a vitiated atmosphere before that effect shows 

 itself on the animals or their production of milk. At Newton the 

 influence seemed to show itself between the fourth and fifth week 

 after the experiment began. 



8. The great causes of variation in the fat in milk are: i) Ir- 

 regularity in the hours of milking ; 2) The individuality of the cow ; 

 3) Want of perfection in milking. 



9. Any saving in food which is effected by keeping the ani- 

 mals at a higher temperature is equalled, if not exceeded, by im- 

 proved digestion when they have plenty of fresh air but a lower 

 temperature. 



10. There is reason for believing that those great scourges of 

 the dairyman, mammitis or weeds and tuberculosis, may be reduced 

 to a minimum if cows are kept in freely ventilated byres in winter. 



Finally tables are appended giving the detailed yields. 



E. PORTER. The Construction of Cowsheds. The Dairy, 



Vol. XXII, No. 255, 67. London. March 15, 1910. 



To produce milk of the best quality and condition it is ne- 

 cessary that the cowhouses should be constructed on the best 

 possible lines. 



