Milk Yield of Jersey Cattle. 

 TABLE 1. 



125 



Coefficients of Correlation of Milk Production of a Given Age 

 With the Milk Production of Another Given Age. 



Age 



2-3 



3-4 



4-5 



5-6 



2 to 3 





+0.5764±.0332 



+ 0.5426+.0361 

 +0.6206±.0335 



+0. 5373+. 0406 



3 to 4 



+0.5764+.0332 

 +0.5426-K0361 

 +0.5373+.0406 

 +0.5500-+-.0426 

 +0.5815-K0468 

 +0.4938+.0488 

 +0.5603-1-.0732 



+0.5479+.0395 



4 to 5 



+0.6206-1-.0335 

 + 0.5479+.0395 

 +0.5305-K0452 

 + 0.5394+.04S3 

 + 0.5376-1-.0465 

 + 0.6336-1-.0925 



+0.5541-K0391 



5 to 6 



+0.5541+.0391 

 + 0.5624+.0421 

 +0.6328-1-.0380 

 + 0.4154-1-.0503 

 +0.2144+.0919 





6 to 7 



7 to 8 



8 to 10 



10 and older 



+ 0.7306+.0284 

 +O.5667+.0403 

 +0.5405+.0397 

 +0.5371+.0697 





Age 



■ 



6-7 



7-8 



8-10 



10 and older 



2 to 3 



3 to 4 



4 to 5 



5 to 6 



6 to 7 



+ 0.5500-K0426 

 +0.5305+. 0452 

 +0.5624+.0421 

 + 0.7306±.0284 



+0.5815-K0468 

 +0.5394-K0483 

 +0.6328+.0380 

 + 0.5667+.0403 

 +0.6515±.0349 



+0.4938+.0488 

 +0.5376-K0465 

 + 0.4154+.0503 

 +0.5405+.0397 

 + 0.4800-K0427 

 + 0.5750±.0367 



+0.5603+.0732 

 +0.6336+. 0925 

 +0.2144+.0919 

 +0.5371+.0697 

 + 0.4578+.0666 



7 to 8 



+0.6515-K0349 

 +0.4800-K0427 

 + 0.4578-1-.0666 



+ 0.3036+.0712 



8 to 10 



+ 0.5750+.0367 

 +0.3036+.0712 



+ 0.5113+.0448 





+0.5113±.0448 









The graph for the correlations, coefficients of the milk pro- 

 duction of one lactation with the milk production of subsequent 

 lactations of the same cows shows little deviation from a straight 

 line.' The values of these correlations range from +0.4938 

 ±.0488 to +0.5815=!=. 0468. The values for the three year cor- 

 relations with the other years range is somewhat higher +0.5305 

 ±.0452 to -(-0.6336=!= .0925. These correlations would be quite 

 accurately described by a linear function. The values of the 

 correlation of four year old's production with those of other 

 years range from -|-o. 2144 ={=.0919 to +0.6328 ±.0380. On the 

 whole these values are slightly lower than are those for other 

 years. The values for the five year olds range from +0.5371 

 ±.0697 to +0.7306==:. 0284. These values are the highest in 

 their range of any of the ages. The correlations for the six 

 year productions with those of other ages range from 0.4578 

 rfc.0666 to +0.7306=!= .0284. The correlations for the seven year 

 productions range from 0.3036 ±.07 12 to +0.65 15 ±.0349. The 

 correlations for the 8 and 9 year period range from +0.4154 

 ±.0503 to +0.5750=!= .0367 and the correlations for the produc- 



