106 INVESTIGATION IN MILK PRODUCTION, 
3. ARE THE LEHMANN Facrors APPLICABLE TO HEIFERS 
IN MILK? 
Heifers with first and second calf, covering the periods of 
their three and four-year old form, makeconsiderable growth 
which requires nutriment as well as does the elaboration of 
milk. If the feeding standard is based solely upon the flow 
of milk and weight of cow, there will be a shortage of nutri- 
ment needed. It is obviousthat heifers yielding milk similar 
in quantity and quality may differ in amount of nutrmient ac- 
tually needed, because they may differ in rate of growth, and 
on this account there will be a greater variation in nutri- 
ment required by different individuals than was found to be 
the case with mature cows. Since the ratio of nutrients re- 
quired for growth of body is practically the same as that re- 
quired for milk production, the extra amount of nutriment 
needed for growthshould be provided for, with the nutrients 
needed for milk productionand not withthose calculated for 
simply food of maintenance. The factors used for food of 
maintenance for mature cows will, therefore, be applied to 
heifers. The following table gives a list of heifers in milk 
during the time covered by the record under review, which 
was 154 days, except in the case of Reddy, that came in four 
weeks later, and the nutrients required to a pound of milk 
after deducting the food of maintenance. 
TABLE XXVIII.—Giving Available Nutrients Consumed per Pound of Milk 
Yielded by Heifers. 











Per Cent . Carbo- Ether 
Fat Erotein hydrates | Extract 
1 ry ((0 0 RRR CO CEE ORC DEORP OSC CECOOP ER TIC” AOCnOE ROCCO 320) -052 2D .018 
Qt Cero cocevcssesnavcsscdeceseds scees suede ceecccectees 3.5 -049 .24. -016 
IBPICKS CY <csdiccorcceneccecsbslssescccdcadsseevevecsscess Best .0868 .33 .023 
BOC EY Sicicoctscrvs wocascuescssssesuseesavevees oieees 5.6 .079 537 .027 
ROA Aiyoa ie enerswrene ctw cc scstesecnobeceseu'ceese scence bez O79 .38 .029 
Brrerace fOr Heifers s.iscccccocecouscccocces) cece .065 .314 .022 
Average for Mature Cow6.............005 os 045 4218 .015 



