CONTENTS 



CHAPTER 3 



SELECTION AND IMPROVEMENT OF DAIRY CATTLE . 



Selection of a Breed: Selection of a breed, 40. 



Individual Selection : Selection of individual cows, 42 

 Extent of variation of individuals, 44 High-producing 

 cows more economical producers, 46. 



Selection by Type : How individual selection is made, 47 



The dairy type, 47 The udder, 50 The milk veins 

 and milk wells, 51 The barrel, 52 The score card, 53. 



Selection by Performance Eecords : Selection by records, 

 56 Overrating the importance of rich milk, 56 Complete 

 milk records, 68 Taking samples for testing, 59 Aver- 

 aging tests, 61 Permanent records, 61 Cow testing asso- 

 ciations, 61 Advanced registry, 64 Relation of age of 

 cow to yield and richness of milk, 66. 



Selection of a Bull : Selection of the bull, 69 Differ- 

 ence in transmission of dairy qualities by different bulls, 71 



Methods of selecting a bull, 73 Cross breeding, 74. 



Questions and problems 



Laboratory exercises 



Collateral reading 



PAGES 

 40-78 



75 



78 

 78 



CHAPTER 4 



MANAGEMENT OF DAIRY CATTLE ..... . 79-93 



Decline of milk production in summer, 79 Protection 

 from flies, 79 Dehorning, 81 Marking calves, 82 

 Shelter, 82 Milking the heifer, 83 Methods of milking, 

 84 Hard-milking cows, 85 Effect of interval between 

 milkings, 86 Milking machines, 86 Cow with leaky 

 teats, 87 Bloody milk, 87 Chapped teats, 88 Warts 

 on teats, 88 Bitter milk, 88 Kicking cows, 88 Self- 

 sucking cows, 89 How long should a cow be dry ? 89 

 Drying up a cow, 89 Milking the cow before calving, 90 

 Care of cow after calving, 90 Management of young 

 stock, 91 Care and management of the bull, 91. 



Questions and problems ....... 93 



Laboratory exercises ....... 93 



Collateral reading ........ 93 



