CHAPTER XVI 

 Inheritance of Milk Yield from Dam to Daughter 



The student by this time is familiar with the herd book and 

 Advanced Registries to such an extent that records may be easily 

 found when wanted. The courageous student may be given the 

 problem of finding his own original records for this study. He will 

 need Advanced Registry record cows which have Advanced Regis- 

 try record daughters. The milk yield records will have to be cor- 

 rected for age by the methods previously given. With these rec- 

 ords the direct comparison of the daughter's and dam's records 

 may be made. This task is without much question too large for the 

 limited time which may be devoted to this class. The next best 

 thing is to take the records which have already been tabulated and 

 have the student make the necessary calculations and deduce the 

 results from them. 



The writer consequently suggests that the class take table 80 of 

 M . S. (or some such table where the work of tabulating has already 

 been done) and calculate from it the mean milk yields of the daugh- 

 ters for each grade of milk yield of the dams in the manner given for 

 exercise XII. Plot on cross section paper the average milk yields 

 of the daughters for each grade of milk yield of the dam. What 

 conclusions do you draw from this plot? After reading Chapters 

 X, XI, XII, XIII, XIV, XV, and XVI in M. S. write a short paper 

 on the inheritance of milk yield from the parents. Cross-section 

 paper for this exercise is found on page 100. 



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