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Related Concept Videos

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Genetic Variation

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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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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"...
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Related Experiment Video

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Genetic variability of functional longevity in five rabbit lines.

A G El Nagar1,2, J P Sánchez3, M Ragab1,4

  • 1Institute for Animal Science and Technology, Universitat Politècnica de València, Camino de Vera S/N, 46022Valencia, Spain.

Animal : an International Journal of Animal Bioscience
|January 23, 2020
PubMed
Summary

This study analyzed functional longevity in five Spanish rabbit lines, finding that longevity is not a recommended selection criterion due to low heritability and significant impacts from factors like reproductive status and litter size.

Keywords:
Cox proportional hazards modelgenetic parameterslength of productive liferabbit doessurvival analysis

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Area of Science:

  • Animal Genetics
  • Reproductive Biology
  • Quantitative Genetics

Background:

  • Functional longevity is crucial for rabbit production efficiency.
  • Understanding genetic determination and systematic factors influencing longevity is key for selective breeding programs.
  • Previous studies have not fully elucidated the genetic basis of longevity in diverse Spanish rabbit lines.

Purpose of the Study:

  • To analyze genetic determination differences in functional longevity across five Spanish rabbit lines.
  • To investigate the impact of systematic factors (year-season, parity order, physiological status, litter size) on longevity.
  • To assess the consequences of excluding these factors on additive variance estimates.

Main Methods:

  • Utilized Cox proportional hazard models to analyze functional longevity data from five Spanish rabbit lines (four maternal, one paternal).
  • Incorporated fixed effects of year-season, parity order, physiological status, and number of kits born alive as time-dependent factors.
  • Estimated effective heritabilities and additive genetic variances, exploring models with and without specific systematic factors.

Main Results:

  • Effective heritabilities for longevity were generally low across all lines, ranging from 0.02 to 0.14.
  • Excluding physiological status from the model significantly increased estimated additive genetic variance in all lines.
  • Higher risks of death/culling were observed in early parities, for non-pregnant-non-lactating does, and for does with zero kits born alive.

Conclusions:

  • Functional longevity in these Spanish rabbit lines exhibits low heritability.
  • Systematic factors, particularly physiological status and litter size, significantly influence longevity and must be accounted for.
  • Considering functional longevity as a direct selection criterion is not recommended for these rabbit populations.