

304 REporT OF THE CHEMIST OF THE 
Monthly averages for the first period of lactation : 
(1;) Guernsey cama... . 2 ctME I, os cn es oe + oo 14.70 
(22) SOLSOYS . I . +s aR glo se sce eee eee os 16.70 
(3) Holdernesaqmmme. ; >. 0n)ssenee Toba. .... 0. eos. 22.04 
c+.) (DeVOnS ..\stmmennih it. =< CMTS SUEUR ds oe ee ho eee 22.17 
(5.) Holsteins .: 7pm ..), .. 5 we RT ete (MME nls’. «0's = la’ StS 22.61 
(6.)Ayrshires \. 3 Gomme eek cia clo e's ole os 5 tate ISSR a F's 23.03 
In calculating the cost of butter production in the foregoing 
table, the food alone is considered. The skim-milk and butter- 
milk are worth something, but there is no recognized market 
value for these by-products, and it is considered best to leave 
them out of consideration, and to calculate the cost of the butter 
without reference to them, 
For the sake of uniformity in making our comparisons of the 
breeds, we have arbitrarily adopted ten months as the duration 
of a single period of lactation. In actual dairying, if a cow were 
productive ten months in each. year, and non-productive during 
two months, the cost of keeping her twelve months would need to 
be considered in order to find the actual cost of butter produced. 
The actual cost of her production would be based, not upon the 
cost of her food for the ten productive months, but upon the cost 
of her food for the whole year, the non-productive as well as the 
productive period. However, in this investigation, we are not so 
much concerned with actual cost as with relative cost of butter 
production. Therefore, calculating for all breeds alike, the cost 
of butter production from the food consumed during the same 
productive period, we secure values that show the true relative 
cost of production for the different breeds. 
Below, we present the profits given by each breed from the. 
butter production of the first period of lactation, cost of food alone 
being considered. The price of the butter is estimated at twenty- 
five cents per pound and the cost of food is the same as given 
above. 
PrRoFIts FRom Burrer PRODUCTION FoR THE First PERIOD OF 
LACTATION. 
(EP ICTMOEDSCYS .... SoM. oe. clus be es cee ae $27 60 
(ZAR CESEAS ..... cee RMI h. 6s <ie piles ws ce mn «see 22 15 
(3. )PRLOIMIDS . 2.5) Cua <5. 0 SMM... Cs ae 5 75 
hh ee 2) ee ae 
Ha byes ats Pe va BNR Fae 
i aN Die, ond ae 
i " aes ‘ me 4? 7 
oe 
Mee 
