220 



AGRICULTURE OF MAINE. 



The manner in wTiich the tahle is to be used may be shown 

 by an example. Let^tis compare two herds of Holstein cattle, 

 of approximately ,the same size and on ndarly the same date. 



Table 3. 

 Herd A, October 6, 191 5. 



Name, number, or 

 other distinguishing 

 mark of each cow or 



heifer. 

 Cow (or heifer) No. 



Is the cow 



milking 



now or dry? 



When did she 



calve 

 (freshen) last? 



What is her 

 age? 

 (approxi- 

 mate). 



Month of 

 lactation. 



Efficiency 

 percent- 

 age (from 

 Table 2.) 



1 

 2 

 3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



Milking 

 Milking 

 Milking 

 Milking 

 Milking 

 Milking 

 Milking 

 Milking 

 Milking 

 Milking 

 Dry . . . 

 Dry . . . 

 Dry . . . 



Milking . 



6 

 4 

 11 

 7 

 7 

 9 

 2 

 2 

 2 

 2 

 6 

 5 

 8 



9 



10 



1 



7 



7 



9 



9 



10 



8 



10 



46 



38 



88 



58 



58 



43 



30 



27 



34 



27 















89 



Total cows and heifers in herd =19. Total cows dry=:3. 

 Total cows milking=ll. Total heifers not yet freshened=5. 

 Total cows which have borne calves=14. 



Average EfBciencv Percentage for all cows which have borne calves = 

 46 -t-38 -1-88 -f 58 +58 -t-43 +30 +27 +34 +27 +0 +0 +0 +89 =538 =38 . 43% 



14 14 



Average Efficiency Percentage for all cows now milking =538=49.00% 



11 



Total lbs. milk production October 6, 1915=260. 

 Average per cow which has borne a calf =260 = 18.57 lbs. 



14 

 Average per cow now milking =260 =23.64. 



11 

 Calculated total milk if herd were operating at 100 per cent. 



efficiency (on the basis of all cows capable of milking) 



=26000=676.6 lbs. 



38.43 



Calculated total milk (on the basis of all cows now milking) =26000=530.6 lbs. 

 Average per cow =48. 2 lbs. 



49.00 



