handout15 - Lecture 15 Breeding Values Genotype B1B1 B1B2...

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1 Lecture 15 Breeding Values Genotype Frequency Phenotype Genetic Value B 1 B 1 p 2 P 11 V 11 B 1 B 2 2pq P 12 V 12 B 2 B 2 q 2 P 22 V 22 P ij = mgt + V ij mgt = (P 11 + P 22 ) / 2 m = mgt + (p - q) V 11 + 2pq V 12 (if equil) AGV Genetic Value The contribution of the genotype to the expression of a characteristic Scenario: V 11 = V 12 (complete dominance) Performance is equal. P 11 = P 12
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2 Two components for a single locus: 1) value of individual alleles (B 1 vs. B 2 -- additive or breeding value) 2) value of the allele combination in each individual (dominance value) Genetic Value ANIMAL GENETIC VALUE OWN PERFORMANCE BREEDING VALUE PROGENY Parents can only pass on individual genes, not combinations. To assess the value of an animal as a parent, we evaluate the value of the genes it will transmit. Breeding Value (Additive Genetic Value) Transmitting Ability = 1/2 BV -- average value of gametes produced by an individual EBV -- Estimated Breeding Value ETA -- Estimated Transmitting Ability
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This test prep was uploaded on 03/31/2008 for the course AN SC 221 taught by Professor Pollak,ej during the Spring '07 term at Cornell University (Engineering School).

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handout15 - Lecture 15 Breeding Values Genotype B1B1 B1B2...

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