A note on transgenerational epigenetics affecting egg quality traits in meat-type quail.

Area of Science:

• Animal Genetics and Breeding
• Poultry Science
• Epigenetics

Background:

• Egg quality traits are crucial for meat-type quail production.
• Understanding the role of epigenetics in transgenerational inheritance is important for breeding programs.
• Previous research has primarily focused on additive genetic effects.

Purpose of the Study:

• To estimate transgenerational epigenetic variance for key egg quality traits in meat-type quail.
• To determine the significance of epigenetic effects on traits such as egg length, width, albumen weight, shell weight, yolk weight, and overall egg weight.
• To assess the suitability of current breeding strategies for enhancing egg quality.

Main Methods:

• Evaluated 391 meat-type quail for egg quality traits over three consecutive days.
• Utilized mixed models incorporating random epigenetic effects and restricted maximum likelihood (REML) for variance component estimation.
• Employed a grid-search for the auto-recursive parameter (λ) to estimate epigenetic transmissibility coefficients.

Main Results:

• Epigenetic effects were found to be non-significant for all evaluated egg quality traits.
• Direct heritability estimates for egg quality traits ranged from 0.06 to 0.33, with higher values for albumen weight (AW) and shell weight (SW).
• Epigenetic heritability estimates were very low, close to zero (0.00–0.07), for all traits.

Conclusions:

• Transgenerational epigenetic inheritance does not play a significant role in the variation of egg quality traits in this population of meat-type quail.
• Current breeding strategies that focus on additive genetic effects are adequate for improving egg quality traits.
• Further research may explore other factors influencing egg quality beyond additive genetics and simple epigenetic inheritance.