Thirty-four generations of divergent selection for 8-week body weight in chickens.

Chickens of the Slovenian commercial Prelux-bro line were divergently selected over 34 generations for high and low BW at 8 wk of age. The aim of the study was to estimate responses to selection with a nonlinear model. Estimates of BW for each generation were provided by the mixed model. For fitting generation means against generation or cumulative selection differential, an exponential model was used. Estimates of realized heritability over generations were derived from regression of the response on cumulative selection differential. After 34 generations, the lines differed by approximately 2,220 g for males and 1,860 g for females. Estimates for a selection limit in the high line were 2,598.4 and 2,144.1 g, for males and females, respectively. A selection limit was not reached in the low line. Half of the selection response was obtained after approximately 6 to 8 generations in the high line and 20 to 28 generations in the low line. Estimated realized heritability decreased over generations. Heritability was larger for females than males and reduction of heritability was more rapid in the high line than in the low line. Genetic SD decreased over generations. Phenotypic SD increased over generations in the high line, but was constant in the low line in the initial 22 generations and decreased thereafter. According to the good fit of the nonlinear model and informative parameter estimates, the results confirmed the usefulness of the nonlinear model for analyzing responses to long-term selection.

• Publication year

  2014

• Venue

  Poultry Science

• Publication date

  Unknown publication date

• Fields of study

  Agricultural and Food Sciences, Medicine, Biology

• Identifiers
  DOI 10.3382/ps.2013-03464PMID 24570418
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• Realized heritability declined over generations, was higher in females than in males, and fell more rapidly in the high line than in the low line.

  Confidence 0.97

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• Half of the selection response was achieved much earlier in the high line than in the low line, at roughly 6 to 8 generations versus 20 to 28 generations.

  Confidence 0.95

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• The nonlinear fit estimated selection limits of 2,598.4 g for males and 2,144.1 g for females in the high line, while no selection limit was reached in the low line.

  Confidence 0.96

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• After 34 generations of divergent selection, the high and low lines differed by about 2,220 g in males and 1,860 g in females for 8-week body weight.

  Confidence 0.98

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review

• 8-week body weight

  trait

  Chicken body mass measured at eight weeks of age and used as the selected trait in the experiment.

  Aliases: BW at 8 wk of age, 8-wk body weight

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• divergent selection

  selection protocol

  A breeding scheme in which one line is selected upward and another downward for the same trait across generations.

  Aliases: high and low selection lines, opposite-direction selection

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• nonlinear model

  model

  An exponential curve-fitting approach used to describe generation means and selection response over time.

  Aliases: exponential model

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• phenotypic sd

  variability measure

  The standard deviation of observed body weight values within a generation or line.

  Aliases: phenotypic standard deviation

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• realized heritability

  estimate, metric

  An empirical heritability estimate derived from regressing selection response on cumulative selection differential.

  Aliases: realized h2

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• selection limit

  estimate, model parameter

  The asymptotic value estimated from the nonlinear selection-response model for a line and sex.

  Aliases: asymptote

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review

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