Maine Agricultural Experiment Station. 1919. 



TABLE 3. 



Jersey Year Records. Probable Errors of Differences Between 

 Mean Performances of Mothers and Daughters. 



N 



Milk 



Fat % 



Net Fat 



2 



1154.5 lbs. 



0.353 % 



58.21 





3 



942.6 lbs. 



0.288 % 



47.53 





4 



816.3 lbs. 



0.249 % 



41.16 





5 



730.1 lbs. 



0.223 % ' 



36.82 





6 



666.5 lbs. 



0.204 % 



33.61 





7 



617.1 lbs. 



0.189 % 



31.11 





8 



577.2 lbs. 



0.176 % 



29.11 





9 



544.2 lbs. 



0.166 % 



27.44 





10 



516.3 lbs. 



0.158 % 



26.03 





11 



492.3 lbs. 



0.150 % 



24.82 





12 



471.3 lbs. 



0.144 % 



23.76 





13 



452.8 lbs. 



0.138 % 



22.83 





14 



436.3 lbs. 



0.133 % 



22.00 





15 



421.5 lbs. 



0.129 % 



21.26 





16 



408.2 lbs. 



0.125 % 



20.58 





17 



396.0 lbs. 



0.121 % 



19.97 





18 



384.8 lbs. 



0.118 % 



19.40 





19 



374.6 lbs. 



0.114 % 



18.89 





20 



365.1 lbs. 



0.112 % 



18.41 





21 



356.3 lbs. 



0.109 % 



17.96 





22 



348.1 lbs. 



0.106 % 



17.55 





23 



340.4 lbs. 



0.104 % 



17.17 





24 



333.3 lbs. 



0.102 % 



16.80 





25 



326.5 lbs. 



0.100 % 



16.46 





26 



320.2 lbs. 



0.098 % 



16.14 





27 



314.2 lbs. 



0.096 % 



15.84 





28 



308.5 lbs. 



0.094 % 



15.56 





29 



303.2 lbs. 



0.093 % 



15.29 





30 



298.1 lbs. 



0.091 % 



15.03 





31 



293.2 lbs. 



0.090 % 



14.79 





32 



288.6 lbs. 



0.088 % 



14.55 





33 



284.2 lbs. 



0.087 % 



14.33 





34 



280.0 lbs. 



0.086 % 



14.12 





35 



276.0 lbs. 



O.0S4 % 



13.92 





36 



272.1 lbs. 



0.083 % 



13.72 





37 



268.4 lbs. 



0.082 % 



13.53 





38 



264.9 lbs. 



0.081 % 



13.35 





39 



261.4 lbs. 



0.080 % 



13.18 





40 



258.2 lbs. 



0.079 % 



13.02 





Change in the Relative Milk Production or Butter-Fat 



Percentage of a Bull's Daughters Over That of 



Their Dams. 



Table 2 in conjunction with table I furnishes information 

 of a good deal of value in distingushing bulls of superior worth 

 as measured by what their progeny do in producing milk or 

 butter-fat. It is altogether probable that a bull in a herd com- 

 posed of cows like Sophie's Agnes or Vive la France would 

 find it harder to raise the production of these cow's offspring 

 than would the same bull going into a herd composed of 4000 

 pound cows. Now a table to measure the sire's transmitting 

 qualities by his progeny performance similar to the one con- 



