XXXVl TABLE OF CONTENTS 



CHAPTER XXI 

 Establishing a Flock and Improving It 



Page 



1. Important Considerations When Establishing a Flock_- 445 



(a) The consideration of environment. 



(b) The consideration of proximity to market. 



(c) The consideration of food supplies. 



2. Establishing a Pure-Bred Flock 447 



(a) Who may engage in the work. 



(b) Determining the choice of breed. 



(c) The character of the foundation animals. 



(d) The sources from which they may be obtained. 



3. Establishing a Flock of Grades 451 



(a) The essentials as to form in the females. 



(b) Blood elements in the same. 



(c) The sources from which they may be obtained. 



4. The Sires Used in Grade Flocks 4.'i2 



(a) They should always be purely bred. 



(b) The factors that determine choice in breed. 



(c) The character of the rams. 



5. The Improvement of the Flock 455 



(a) The three factors in improvement. 



(b) The part played by the sires. 



(c) What is accomplished by selection. 



(d) What may be due to food. 



6. Improvement Through the Sires -ir,! 



(a) Why successive sires from the same breed should 



be chosen 



(b) The time called for to reach high development. 



(c) The Minnesota station experiment. 



(d) To what extent in-breeding may be practiced. 



7. Improvement Through Selection 4.'>9 



(a) Discard inferior females before they are bred. 



(b) Ewes that should be discarded at the weaning sea- 



son. 



(c) The necessity for rejecting some will always exist. 



8. Improvement Through Food 461 



(a) Food adapted to the needs of the sheep. 



(b) Food adapted to the needs of the breed. 



(c) Food adapted to the requirements of the breeding. 



9. When Crossing Is Legitimate 40:3 



(a) When pure breeds may be crossed. 



(b) Making more than one cross. 



(c) Introducing an out cross. 



