assignment 10

assignment 10 - 1. 2. 3. 4. 5. 6. 7. 8. 9. Sametra Williams...

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Sametra Williams Enrollment #: 646028 September 15, 2008 Assignment 10 1. The overall objective of breeding dairy cattle for improvement of genetic ability for high performance at reasonable cost is to breed a more useful and productive cow—a cow that will stay with the dairyman for a long period of time and has the greatest capability to make a profit for the dairyman. This can be accomplished by selection and culling and the use of appropriate mating plans. 2. Desired characteristics of a dairy breed is that the cow demonstrates high milk production throughout a long, productive life. At the same time, the dairy cattle breeder must eliminate non-productive or undesirable animals through culling. 3. Natural Selection: animals that produce progeny far above the means will continue to exist (survival of the fittest). Artificial Selection: the type of selection practiced by man. 4. The three types of artificial selection are: a. Tandem Selection: involves the selection of one trait at a time; once the desired progress for the trait is achieved, another trait may be selected for improvement. b. The Independent Culling Method: involves the selection of a number of traits at the same time, assigning each trait a minimum acceptable value. c. The Selection Index Method: the most efficient method for making genetic improvement; involves the selection of a number of traits, and a weighing factor is assigned for each trait according to its relative economic importance, heritability, and genetic correlation with other selected traits. 5. The relationship between heredity and the environment is that if environmental conditions are favorable to a particular breed, heredity will be high. When animals can highly sustain environmental conditions, they are able to highly reproduce, resulting in better heredity conditions. Environmental ceiling is termed to mean “the restriction imposed on performance as a result of feeding and management.” 6. The four reasons for breeding dairy cattle are: a. Milk Production: the most important trait to dairymen b. Herd Replacement c. Herd Improvement d. Sale of Cattle for Breeding Purposes 7.
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This note was uploaded on 02/03/2009 for the course DARY 1048 taught by Professor Jenny during the Spring '08 term at LSU.

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assignment 10 - 1. 2. 3. 4. 5. 6. 7. 8. 9. Sametra Williams...

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