60 DAIRYING 



butter fat production for 30 days, and the receipts from butter 

 fat for $1.00 worth of feed. 



8. Mention six or more ways in which these associations may be 

 a benefit to the members. 



9. What is the -tlifference between Cow Testing Associations and 

 Advanced Registry testing of cows? 



10. When and by whom was the Advanced Registry testing begun? 



11. Where are the headquarters of the Secretaries of the Associa- 

 tions which make Advanced Registry tests of cows? 



12. What is an official test, a semi-official test, and how long a 

 time does each coyer? 



13. W 7 hat is meant by a retest? 



14. W 7 hat are the requirements for admission to the Advanced 

 Registry in each of the dairy breeds? 



15. What is meant by "Dairy Cow Competition" tests? 



16. Mention some of the individual characteristics of a cow that 

 are of importance to a dairyman. 



17. What is the usual relation between amount and richness of a 

 cow's milk? If the milk suddenly increases in weight what 

 is the common change in richrfess? 



18. What kind of cows show the most striking variations in rich- 

 ness of milk? 



19. What may a sudden change in richness of a cow's milk indicate? 



20. To what extent may the test of one cow's milk vary from day 

 to day? Give figures. 



21. Is this variation the same with all cows and how does it differ? 



22. What is meant by "Lactation period'' and what influences its 

 length ? 



23. What is a satisfactory "standing dry" period in days? 



24. How may the lactation period be lengthened? 



