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Related Concept Videos

Heritability01:06

Heritability

Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic" a trait is,...
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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
Factors Affecting Activity Coefficient01:17

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Providing Meaningful Environmental Enrichment and Measuring Saliva Cortisol in Pigs Housed on Slatted Flooring
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Factors associated with sow stayability in 6 genotypes.

M Knauer1, K J Stalder, T Serenius

  • 1Department of Animal Science, 109 Kildee Hall, Iowa State University, Ames, 50011-3150, USA.

Journal of Animal Science
|August 3, 2010
PubMed
Summary

Production factors significantly impact sow longevity to parity 4 (STAY4). Key predictors include age at first farrowing and lactation feed intake, which influence sow retention across all genetic lines.

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Area of Science:

  • Animal Science
  • Reproductive Biology
  • Swine Production

Background:

  • Sow longevity is crucial for herd profitability and genetic improvement.
  • Understanding production factors influencing stayability to parity 4 (STAY4) is essential for optimizing breeding programs.

Purpose of the Study:

  • To identify production factors associated with STAY4 in female pigs.
  • To analyze the impact of these factors across different genetic lines.

Main Methods:

  • Utilized stepwise logistic regression on data from 2,293 female pigs across 6 genetic lines.
  • Included categorical (farm, entry date) and continuous (gilt backfat, ADG, age at puberty, age at first farrowing, lactation feed intake, etc.) effects.
  • Nested all effects within genetic line.

Main Results:

  • Significant factors for STAY4 included farm, entry date, age at first farrowing, ADG, gilt backfat, and lactation effects.
  • Age at first farrowing and lactation feed intake demonstrated a consistent impact across all evaluated genetic lines.
  • Age at puberty, age at first farrowing, and lactation feed intake were identified as having the greatest influence on STAY4.

Conclusions:

  • Production factors, particularly age at first farrowing and lactation feed intake, are critical determinants of sow stayability.
  • These findings can inform management strategies to enhance sow longevity and improve breeding program efficiency.