108 INVESTIGATION IN MILK PRODUCTION. 
testing 3.5 per cent butter fat, gives approximately, that re- 
quired in the production of milk testing 2.5 per cent butter 
fat, which is .038 of a pound of protein, .1883 of carbohy- 
drates and .01268 ether extract per pound of milk yielded, 
from which is deduced the following graduated scale of ap- 
proximate nutrient requirements for the production of a 
pound of milk testing a given per cent of butter fat, based 
upon the performance of the heifers in the station herd cov- 
ering a period of 154 days. 
The factors of nutrients required for the production of 
one pound ot milk by the heifer Reddy are not used in calcu- 
lating the rate of increase of nutrients because she made 
gain more than for normal growth, as will be seen from the 
following table, giving the weight at the beginning and close 
of the experiment. 
TABLE XXX.—Giving Gain in Weight by Each Heifer. 






Lydia Quidee Tricksey | Beckley Reddy 
INGE (QU@S@ oa-cenoacssnscosasn00NNOGIOuDS 1083 869 763 862 “ey 
Att Bepitintit@iecnccsssesseeece-eees 1014 785 723 839 747 
A Monel (Geb tal Coocccon cososacesooEn-o0 69 84 40 23 44. 
DY east liye Creulitleesenesecaeedaceoess senses 47 | 57 7 16 .78 






The rate of gain made by Reddy shows why the nutri- 
ents consumed daily were not proportionate with the yield 
and quality of milk. Tricksey gavemilk testing 5.1 per cent 
fat and returned a pound of milk to .068 of a pound of pro- 
tein, while Reddy gave milk testing only .1 of a per cent 
higher returned a pound of milk to .079 of protein, showing 
that she converted part of the nutrients into body fat. 
Neither was she in milk during the earlier weeks of the ex- 
periment. The weights are the average of three weekly 
weighings at both the beginning and close, and for Lydia, 
Quidee, Tricksey and Beckley they cover a period of 147 
days, and for Reddy only 56 days. 
The data submitted show that heifers require more nutri- 
ents per pound of milk yielded than do mature cows. 
