NUTRIENT REQUIREMENTS 107 
The heifers used nutrients in proportion to the quantity 
and quality of milk yielded, the same as was the case with 
the mature cows, but they returned a pound of milk to .065 
of protein available for product, while the mature cows re- 
turned a pound of milk to .045 of protein; the heifers requir- 
ing nearly one-half more available nutrients to a pound of 
milk than did the cows. 
Again seeking the rate of increase in nutrients required 
for each .1 per cent increase in butter fat, between the aver- 
age amount of nutrients required by the heifers yielding milk 
containing 3.5 per cent of butter fat, and those yielding milk 
testing above 5 per cent, it is found to be .00125 of a pound 
of protein, .00567 of carbohydrates and .000432 of ether 
extract. Multiplying this by ten and subtracting the pro- 
duct from the nutrients used by the heifers yielding milk 
TABLE XXIX.—Giving Net Nutrients Required by Heifers for the Production 
of One Pound of Milk Testing a Given Per Cent of Butter Fat. 




> x Carbo- Ether 
Protein hydrates Extract 
Brelaatee tesa cies aciais Casaysteiclaes eisiele stele atelen 2.5 -0380 -188 .0127 
ae cone ‘cbitic) Senne EEE ee ae 2.6 .0393 194 0131 
=a 7 0405 200 .0135 
2.8 -0418 .205 0140 
9 0430 211 -0144 
0 0443 AT -0148 
Bal 0455 sae -0153 
ey 0468 -228 .0157 
3 -O480 .234 O16L 
4 | 20493 .239 .0166 
5 0505 245 -O170 
6 .0518 -251 .0174 
Biel -0530 .256 0179 
3.8 0543 -262 0183 
Sete) .0555 .268 .0O187 
4,0 0568 273 .0192 
4.1 0580 27S) .0196 
4.2 0593 .285 0200 
4.3 0605 .290 .0205 
4.4. .0618 -296 .0209 
4.5 .0630 402 .0213 
4.6 0643 307 .0218 
4.7 .0655 epls} .0222 
4.8 .0668 “oo 0226 
4.9 0680 -324 0230 
5.0 .0693 .330 .0235 
Sal -<O705 .336 .0239 
5.2 .0718 341 .0243 
5.3 0730 347 0248 
5.4 0743 =o02) .0252 
5.5 -O755 -35%8 .0256 
5.6 0768 .364 0261 
157; .O780 -370 -0265 
5.8 0793 -o15 -0269 
“O59 .0O805 381 .0274 
6. O .O818 .387 0278 
Aas BO oki OL 






