Divergent Selection for Body Density in Japanese Quail (Coturnix coturnix japonica)

Garwood, V. A.; Diehl, K. C.; Haugh, C. G.

doi:10.3382/ps.0681033

Cited by 5 publications

(1 citation statement)

References 13 publications

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“…Pym and Solvyns (1979) suggested that selection based upon improving feed efficiency could be used to indirectly select for decreased fatness. Garwood et al (1989) attempted unsuccessfully to use body density to indirectly select for decreased carcass fat in Japanese quail.…”

Section: Torttf Et Almentioning

confidence: 99%

Genetic and Phenotypic Relationships in Japanese Quail.

et al. 1991

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Live BW, carcass data, and organ data taken at 34 days of age on approximately 1,000 quail of both sexes from 110 sires and 290 dams were utilized to estimate genetic parameters from the initial generation of a selection study. The birds represented a sample of a line selected for high 4-wk BW. Data were analyzed using Henderson's Method 3 (MM3) and restricted maximum likelihood (REML) with and without a relationship matrix. The paternal half-sib heritabilities for body, carcass, and organ weights in Japanese quail were moderate to high for most traits studied, suggesting that selection to increase or decrease these traits should be successful. With the exception of BW, abdominal fat (AF), and heart weights, maternal half-sib heritability estimates were smaller than paternal half-sib estimates. Heritability estimates of traits adjusted for BW tended to be lower than counterparts not adjusted for BW. The genetic correlations of BW with the other carcass measurements were positive, and tended to be moderate to high. The correlation of BW with AF was .34, suggesting that selection for increased BW alone will lead to a bird with more abdominal fat. The correlations of AF with the other traits tended to be low to moderate in magnitude, with three of the correlations being negative, suggesting correlated responses with other traits when selecting for increased or decreased AF would be small. Genetic correlations among various muscle measurements were all positive and most were high in magnitude, indicating that traits easiest to measure and collect can be used in a selection process. The genetic correlations among the organ measurements were positive and moderate as were the correlations of organ weights with muscle weights. Negative genetic correlation estimates between AF and muscle measures were obtained from analysis when BW was a covariate. The REML heritability estimates were higher than MM3 estimates and REML genetic correlation estimates were less extreme than MM3.

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Section: Torttf Et Almentioning

confidence: 99%

Genetic and Phenotypic Relationships in Japanese Quail.

et al. 1991

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Application of REML procedure to estimate the genetic parameters of weekly liveweights in one‐to‐one sire and dam pedigree recorded Japanese quail

Saatcı¹,

Dewi²,

Aksoy³

2003

J Animal Breeding Genetics

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Summary Residual maximum likelihood procedure was applied to analyse data from a one‐to‐one pedigreed Japanese quail population, using an animal model to estimate the genetic parameters of weekly liveweights. Records of 1108 animals from 113 sires and 152 dams were analysed. An individual animal model was used. The heritabilities of weights for hatching (HW) with their standard errors (SE), week 1 (W1), week 2 (W2), week 3 (W3), week 4 (W4), week 5 (W5) and week 6 (W6) were 0.51 ± 0.05, 0.32 ± 0.06, 0.20 ± 0.05, 0.21 ± 0.06, 0.20 ± 0.05, 0.15 ± 0.04 and 0.14 ± 0.04, respectively. The strongest genetic correlations were found between W1 and W3 (0.98 ± 0.11). Generally, genetic correlations were higher than the phenotypic correlations. The highest phenotypic correlation (0.85) was between the W4 and W5 weights. Strong genetic correlations among the weekly weights suggest that selection for W5 or W6 weight may be based on weights recorded earlier.

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Experimental study of the relative efficiency of nonlinear and restricted selection indices for ratios including quadratic and cubic terms

Campo

Jorquera

1994

J Animal Breeding Genetics

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A nonlinear selection index (NL) method was compared with restricted linear index (RI) using two experiments of upward selection for the weight/(lenght)(n) ratio in Tribolium castaneum. The first experiment was designed to increase pupal weight/(pupal length)(2) , while the second experiment was intended to improve larval weight/(larval length)(3) . Larval and pupal traits were measured at 14 and 21 days after adult emergence, respectively. There were four generations of selection in each of three replicates, the proportion selected being 20 %. The selection criterion in the NL lines was (m(1) + Ĝ(1) )/(m(2) + Ĝ(2) )(n) , where m(1) and m(2) are the population means for the numerator and denominator traits, Ĝ(1) and Ĝ(2) are the estimated additive genetic values, and n is 2 (experiment 1) or 3 (experiment 2). The restricted linear index used as the selection criterion in the RI lines was calculated to increase the numerator trait and hold the denominator constant. Responses observed for the ratios differed significantly between lines (P < .05) in both experiments, the NL lines having the greatest responses. In experiment 1, the observed response for increasing the numerator was significant in the NL line, while the observed responses were positive and significant for both traits in the RI line; lines differed significantly pupal length (P < .01). The response obtained for the ratio in experiment 2 was due to decreases in both component traits. Results of these experiments showed that the nonlinear selection indices increased ratios that included quadratic and cubic terms in the denominator. Restricted linear indices holding the denominator constant were a less efficient alternative. ZUSAMMENFASSUNG: Experimentelle Studie über die relative Wirksamkeit nicht-linearer und beschränkter Selektionsindexe für Quotienten mit quadratischen und kubischen Größen Ein nicht-linearer Selektionsindex (NL) wurde mit einem linearen Index mit Restriktion (RI) bei Tribolium mittels eines Selektionexperiments zugunsten des Quotienten Gewicht/(Länge)(n) verglichen. Das erste Experiment zielte auf Erhöhung von Gewicht der Puppe/(Länge der Puppe)(2) , während das zweite Experiment der Verbesserung von Gewicht der Larve/(Länge der Larve)(3) diente. Merkmale von Larve una Puppe wurden jeweils nach 14 und 21 Tagen gemessen in drei Wiederholungen und vier Selektionsgenerationen mit je 20% Selektion. Das Auswahlkriterium der Linien NL war (m(1) + Ĝ(1) )/(m(2) + Ĝ(2) )(n) , wobei m(1) und m(2) den Durchschnitt für Zähler- und Nennercharakteristika darstellen, Ĝ(1) und Ĝ(2) die angenommenen Werte sind und n 2 (Experiment 1) oder 3 (Experiment 2) ist. Der bei den Linien RI als Selektionskriterium verwendete Beschränkungsindex wurde zur Erhöhung des Zählers und zur Konstanthaltung des Nenners angenommen. Die Ergebnisse für den Quotienten waren bei beiden Experimenten zwischen Linien (P < .05) signifikant unterschiedlich, wobei die Reaktion der NL-Linien größer war. Beim Experiment 1 war die Reaktion der Linie NL im Zähler signifikant, während s...

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Divergent Selection for Body Density in Japanese Quail (Coturnix coturnix japonica)

Cited by 5 publications

References 13 publications

Genetic and Phenotypic Relationships in Japanese Quail.

Genetic and Phenotypic Relationships in Japanese Quail.

Application of REML procedure to estimate the genetic parameters of weekly liveweights in one‐to‐one sire and dam pedigree recorded Japanese quail

Experimental study of the relative efficiency of nonlinear and restricted selection indices for ratios including quadratic and cubic terms

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