40 BULLETIN 521, U. S. DEPAETMENT OF AGRICULTUKE. 



Practicum 2. — Judging Bacon Hogs. 

 Lesson 3. — Breeds of Swine. 



1. The Berkshire. 



(cf) Characteristics and utility. 

 (&) Origin and history, 

 (c) The Berlcsliire in the United States. 

 • (Same outline for all important breeds of swine.) 



2, The Poland China. 



Lesson 4. — Breeds of Swine — Continued. 



1. Chester White. 



2. Duroc Jersey. 



Lesson 5. — Breeds of Swine — Continued. 



1. Hampshire. 



2. Tamworth. 



3. Large Yorkshire. 



4. Any of the following breeds or others which may be of local importance : 



Small and middle Yorkshire, Mulefoot, Cheshire, "Victoria, Essex. 



Lesson 6. — Market Classes and Grades of Swinge. 



1. The swine market. 



2. Grades of swine. 



3. Swine products. 



Special reference : Judging Swine as a Subject of Instruction in Secondary 

 Schools, Agricultural Education Monthly, Vol. II, No. 7. 



Praoticums 3 AND 4. — Judging Swine. 



IMPROVEMENT OF ANIMALS. 



(Five lessons.) 

 References. — 



Principles of Breeding and Origin of Domesticated Breeds of Animals, 

 Separate from Twenty-seventh Report of Bureau of Animal Industry, 

 1910. 



Lesson 1. — Variation in Animals. 



1. Law of variation. 



2. Sports and mutations. 



3. Selection. 



(a) Natural. 

 (&) Artificial. 



Lesson 2. — Heredity. 



1. Law compared with variation. 



2. Mendel's law. 



3. Cross breeding versus pure breeding. 



Lesson 3. — Prepotency. 



1. Value in breeding. 



(a) Prepotent individuals. 



2. A study of pedigrees. 



3. Registration of animals. 



Lesson 4. — Practical Problems in Breeding. 



1. Increasing variation. 



2. Selection according to ideals. 



3. Testing hereditary power. 



