TABLE 1. 

 Data on the Growth of the Dairy Cow* 



Holstein cows. 



Age. 



birth 



1 



2 



3 



4 



5 



6 



7 



8 



9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 



Average 

 deviation 



from 

 average 

 weight, t 



lbs. 



4.3 

 5.6 

 13.1 

 15.3 

 20.2 

 21.9 

 34.0 

 31.5 

 41.8 

 50.5 

 35.7 

 39.9 

 36.3 

 38.6 

 42.9 

 42.2 

 45.7 

 36.0 

 33.0 

 31.9 

 47.0 

 51.5 

 43.1 

 38.8 

 48.6 

 42.0 

 54.5 

 55.0 

 58.7 



Devia- 

 tion. § 



percent 



3.6 



3.5 

 6.6 

 6.2 

 6.7 

 6.3 

 8.8 

 7.4 

 8.95 

 10.0 

 6.7 

 7.2 



Jersey cows. 



Number 



of 

 animals 

 weighed. 



6.9 



5.3 

 4.6 

 4.3 

 6.0 

 6.5 

 5.2 

 4.6 

 5.6 

 4.7 

 5.9 

 5.7 

 5.9 



94 



6 



7 



7 



8 



9 



10 



10 



10 



1 



Average 

 weight. 



lbs. 



55 

 76 

 105 

 140 

 174 

 222 

 260 

 302 

 340 

 376 

 407 

 432 

 456 

 480 

 503 

 520 

 533 

 553 

 572 

 598 

 621 

 649 

 668 

 689 

 716 

 737 

 758 

 770 

 784 

 804 



Range 

 in 



weight. 



lbs. 



35 



31 



34 



54 



73 



83 



101 



107 



134 



152 



146 



134 



124 



118 



127 



114 



87 



95 



78 



126 



130 



151 



108 



179 



133 



147 



188 



212 



92 



Average 



deviation 



from 



average 

 weight. 



lbs. 



10.7 

 11.0 



14.4 

 18.5 

 22.0 

 23.7 

 20.8 

 22.7 

 23.5 

 23.6 

 35.2 

 35.9 

 34.3 

 25.8 

 31.8 

 27.4 

 29.3 

 22.4 

 31.4 

 32.6 

 32.6 



47.6 

 40.2 

 39.3 



Devia- 

 tion. 



percent 



14.0 

 10.5 

 10.3 

 10.6 

 9.9 

 9.1 

 6.9 

 6.7 

 6.3 

 5.8 

 8.0 

 7.9 

 7.1 

 5.1 

 6.1 

 5.1 

 5.3 

 3.9 

 5.2 

 5.2 

 5.0 

 5.0 

 6.9 

 5.6 

 5.3 



* The animals were bred at 20 to 21 months of age, calving at 29 to 30 months 

 of age. 



t Range = difference between observed extremes; thus the observed extreme 



weights of Holstein calves were 55 and 112 pounds, a range of 57 pounds. 



. ^d 



J Average deviation from average weight = a.d. = — > a numerical measure 



n 



of the amount by which a new observation taken under the given conditions is 



likely to differ from the average value. 



. . a.d. 



§ Percentage deviation = — X 100 



m 



Average deviation 

 Average weight 



X 100. 



627 



