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Analysis of Social Genetic Effects on Pigs Fed With Automatic Feeders Using a Visit-Based Approach.

P Nuñez1,2, C Casto-Rebollo1, S Negro3

  • 1Instituto de Ciencia y Tecnología Animal, Universitat Politècnica de Valencia, Valencia, Spain.

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Summary

Social genetic effects influence pig feed efficiency, particularly in Iberian pigs, impacting feed intake and visit duration. This study highlights the potential for independent selection of social and direct genetic traits to improve breeding outcomes.

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Area of Science:

  • Animal Genetics
  • Quantitative Genetics
  • Animal Breeding

Background:

  • Social behavior traits are crucial for feed efficiency in pig farming.
  • Automatic feeders provide extensive data for phenotype collection and breeding.
  • Understanding social genetic effects is key to optimizing pig production.

Purpose of the Study:

  • To assess the impact of social genetic effects on individual feed intake and visit duration in Pietrain and Iberian pigs.
  • To analyze the variance explained by social genetic effects in different pig populations.
  • To investigate the correlations between additive direct and social genetic effects.

Main Methods:

  • A visit-based approach was used to model individual feeder visits.
  • Data from 1608 Pietrain and 856 Iberian pigs, comprising over 1.6 million feeder visits, were analyzed.
  • Phenotypic variance, social genetic effects, and genetic correlations were estimated.

Main Results:

  • Social genetic effects explained ~1% of variance in Pietrain pigs.
  • In Iberian pigs, social genetic effects accounted for 6.2% of variance in visit duration and 5.5% in feed intake.
  • Weak correlations between direct and social genetic effects suggest independent selection is feasible.

Conclusions:

  • The visit-based approach effectively identified social genetic effects in both populations.
  • Models including social genetic effects reduced residual variance, improving additive value accuracy.
  • Selection strategies can be enhanced by considering both direct and social genetic effects for improved feed efficiency.