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Research note: differences in major histocompatibility complex gene frequencies associated with feed efficiency and
S J Lamont1, Y H Hou, B M Young
1Department of Animal Science, Iowa State University, Ames 50011.
Poultry Science
|June 1, 1987
Summary
Major histocompatibility complex (MHC) genes in chickens influence egg production and feed efficiency. Selection for production traits altered the frequency of specific MHC haplotypes, indicating their genetic importance.
Area of Science:
- Animal Genetics
- Immunogenetics
- Poultry Science
Background:
- The major histocompatibility complex (MHC) plays a crucial role in immune responses and has been linked to various physiological traits in many species.
- Understanding the genetic basis of economically important traits like egg production and feed efficiency in chickens is vital for the poultry industry.
Purpose of the Study:
- To investigate the association between genes of the chicken's major histocompatibility complex (MHC) and traits related to egg production and feed efficiency.
- To determine how selective breeding based on production indexes affects the frequency of specific MHC haplotypes.
Main Methods:
- Selection of chicken breeders using indexes that included body weight, egg mass, and feed consumption data.
- Serotyping of over 1,000 progeny for erythrocyte antigen B (Ea-B) after six generations of selection.
- Analysis of the frequency of MHC (specifically Ea-B) haplotypes (B2 and B13) in selected lines compared to a control line.
Main Results:
- The B2 and B13 haplotypes constituted over 75% of the Ea-B gene pool across all investigated chicken lines.
- Selective breeding significantly increased the frequency of the B2 haplotype while decreasing the frequency of the B13 haplotype in index-selected lines compared to the control.
- These changes in haplotype frequency suggest a strong genetic link between MHC genes and the selected production traits.
Conclusions:
- Major histocompatibility complex-linked genes are significantly associated with and influence chicken growth and reproductive physiology, including egg production and feed efficiency.
- Selective breeding strategies targeting production traits can lead to measurable shifts in MHC gene frequencies, highlighting their role in complex trait inheritance.