376 



CATTLE AND DAIRY FARMING. 



Example. A cow gives an average of 20 quarts per day in the second 

 month after calving. How much did she give at the time of calving? 



Represent the amount or quantity she gave by 100, and we find by 

 the table that she now gives an average of 5.424 per cent. less. 100 

 424 = 94.576 = the percentage she now gives, g^ffo = 1.0573. 



In order to facilitate the work and to render it more accurate, giving 

 the coefficients not ooly by months but by weeks, the following table 

 was prepared by Monsieur Coilpo : 



TABLE No. 2. 



Example. A cow having calved five months and twelve days ago, 

 gives now 8.75 quarts per day. How much did she give at the time of 

 calving ? 



She is in the sixth month of her lactation. Seek the intersection ot 

 the perpendicular column of that month, and the horizontal line of 

 " seven to fifteen days," and we find the coefficient 1.6525 ; that is, she 

 gave at the time of calving If $ more milk than she does at the end 

 of five months and twelve days. Multiply the coefficient 1.6525 by 

 the amount of milk she now gives, 8.75 quarts, another answer will be 

 what she gave at the time of calving in 8.72 x 1.6525 = 14.46 quarts, 

 the answer. 



These tables do not pretend to mathematical correctness that cannot 

 be attained by any table or formula. They only pretend to give from 

 the test of experience the probable rate of decrease or " taper" which 

 may be expected in the milk-giving qualities of cows. 



When the calculation is sought to cover a long period of milking, like 

 ten or twelve months, it becomes uncertain. The jury did not apply it 

 for a greater period than seven months. 



I now give the result of the competitive examination, being the table 

 presented by the jury. 



I have continued the weight in kilograms and the measure in liters. 

 The law of the United States has legalized the metric system and al- 

 lows it to be used (Rev. Stat., sec. 3570). A kilogram is equivalent to 

 2.2046 pounds avoirdupois, and 1 liter is equivalent to 1.0567 quarts. 

 Roughly stated, a kilogram is 2 pounds, and a quart and a liter may be 

 taken as synonymous. Any one interested can easily make the calcu- 

 lation to his own satisfaction. 



Twenty-two of these cows in the table gave over 20 liters, twelve gave 

 over 24 liters, three gave over 28, two over 30, while one gave 34.3 

 liters, or over 8 gallons of milk, as her daily yield. Twenty gave over 

 2 liters of cream, five gave over 3, while one gave 4.7 liters. 



