Genetic interpretation and analysis of diallel crosses with animals

Eisen, E. J.; Hörstgen‐Schwark, Gabriele; Saxton, Arnold M.; Bandy, Tawana

doi:10.1007/bf00276256

Cited by 84 publications

(88 citation statements)

References 19 publications

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“…In genetic terms, the SCA represents the non-additive effect of putting gametes together in pairs to make the F1 genotypes. Eisen et al (1983) concluded that the highest absolute values of SCA of a cross combination occur when gene frequency of both lines diverge the most from mean gene frequency at loci exhibiting favourable dominance direct effects. Extending the concept of SCA at the level of gene expression, Kiekens et al (2006) concluded that the SCA represents the interaction of the gametes i.e.…”

Section: Resultsmentioning

confidence: 99%

Analyses of Crossbreeding Parameters for Juvenile Body Weight in Broiler Chicken

Nath

Singh

Saxena

et al. 2007

Journal of Applied Animal Research

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Section: Resultsmentioning

confidence: 99%

Analyses of Crossbreeding Parameters for Juvenile Body Weight in Broiler Chicken

Nath

Singh

Saxena

et al. 2007

Journal of Applied Animal Research

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“…= the k-th observation on the progeny of a mating of a dam from the j-th line with a sire of the i-th line in the h-th type of breeding (purebred or crossbred, h = 1,2), = mean of the purebred and crossbreds, = effects common to all progeny of the hth type of breeding (purebred or crossbreds); similar to average heterosis ( ) in model A (Eisen et al, 1983), = effect common to all progeny of a mating between a dam of the i-th line and a sire of the i-th line;…”

Section: Wherementioning

confidence: 99%

“…The least squares estimators of the parameters are as shown in (Jakubec et al, 1987), where model A is the model developed by (Eisen et al, 1983) while model B is developed by (Harvey, 1960) and extended by (Jakubec et al, 1987). The choice of this model (Model B) is because it is the most appropriate when the parental lines are less than 4.…”

Section: Wherementioning

confidence: 99%

Estimates of Crossbreeding Parameters for Growth and Conformation Traits in Nigerian Indigenous and Exotic Pig Breeds

Okoro¹

2017

Appl. Ecol. Env. Res.

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Abstract. Information on the crossbreeding parameter estimates involving Nigerian Indigenous pigs and exotic breeds are rare, as well as the best combination for improved growth and conformation traits. A 3×3 diallel cross was conducted among three breeds of pigs -Large White (WW), Landrace (RR) and Nigerian Indigenous pig (NN) breeds. Growth traits measured were body weight at birth (BWB), weaning (BWW at 6 weeks), maturity of 20 weeks (BW20) and average daily gain (ADG up to 20 weeks), while conformation traits were heart girth (HG), height-at-withers (HW), and body length (BL) all at 20 weeks of age. Significant heterotic and maternal effects were reported for BWW, BW20 and ADG. Also significant specific heterosis was recorded only for BW20, with no significant reciprocal effect for the other growth traits measured. Significant heterotic effects for HG and BL were also recorded, while maternal effect was significant only for BL. Significant specific heterosis was recorded for HG, while reciprocal effect was significant only for HW and B. This implies that for growth traits, RR, WW and NN breeds had the best combining ability for BWW, BW20 and ADG respectively with a high positive average heterosis of 0.06, 2.53 and 1.58. This shows that NN breed could elicit attractive economic and environmental benefits when crossbred with exotic ones, in terms of growth traits, as shown by the significant crossbreeding parameter values reported.

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“…The mean of a cross or of a purebred strain was set up according to Gardner and Eberhart (1966), Wearden et al (1967) and Eisen et al (1983): …”

Section: Statistical Analysesmentioning

confidence: 99%

Age-regulated expression of genetic and environmental variation in fitness traits. 2. Genetic effects and variances for viability among crosses from a factorial mating of six selected Leghorn strains

Fairfull¹,

Gowe²

1999

Can. J. Anim. Sci.

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Age-regulated expression of genetic and environmental variation in fitness traits. 2. Genetic effects and variances for viability among crosses from a factorial mating of six selected Leghorn strains. Can. J. Anim. Sci. 79: 269-276. White Leghorn strains were crossed reciprocally in a complete factorial mating producing 6 pure strains and 30 strain-crosses, which were kept for two laying cycles: 133-496 d of age and 547-909 d. Hens were housed for lay individually in four two-tiered batteries of cages. Strain additive effects (A i ), strain sex-linked effects (Z i ), strain-cross heterotic effects (h ij ) and residual effects were calculated using regression. Viability was high in the first cycle of egg production with only 1 to 3% mortality in each of the four 11-wk periods, but lower in the second cycle decreasing with age. There was significant variation among strains in additive autosomal and sex-linked genetic effects and strain-cross heterotic effects, which increased with age in the second cycle. Heterosis for viability was positive in some strain-crosses and negative in others with considerable changes with age. The magnitude of heterotic effects was generally greater than the magnitude of additive or sex-linked genetic effects for viability. These results imply that different genotypes mount subtly different genetic responses to the problems of viability with advancing age and that more than one theory of ageing could apply. The results are discussed in relation to the theoretical aspects of ageing genetics.Key words: Ageing, fitness, viability, genetic effects, genetic variation, environmental variation Fairfull, R. W., Liljedahl, L.-E., et Gowe, R. S. 1999. Expression en fonction de l'âge des variations génétiques et environnementales des caractères de durabilité des performances des poules de ponte. 2. Effets et variances génétiques sur la longévité chez des croisements obtenus par accouplements factoriels entre 6 souches sélectionnées de poules White Leghorn. Can. J. Anim. Sci. 79: 269-276. Des croisements réciproques ont été réalisés entre 6 souches de poules White Leghorn selon un protocole d'accouplements factoriel complet. Les poules des 6 souches parentales et des 30 croisements de souche obtenus étaient gardées pour deux cycles de ponte, soit de 133 à 496 j. d'âge et de 547 à 909 jours. Les poules étaient logées en cages individuelles dans quatre batteries à deux étages. Nous avons calculé par régression les effets additifs de souche (A i ), les effets de souche liée au sexe (Z i ), les effets hétérotiques de croisement de souche (h ij ) et les effets résiduels. Le niveau de longévité était élevé dans le premier cycle de ponte avec seulement 1 à 3 % de mortalité dans chacune des périodes de 11 semaines, mais plus élevé encore dans les débuts du deuxième cycle, pour diminuer ensuite en fonction du vieillissement. On constatait des variations significatives parmi les souches quant aux effets de souche (additifs et liés au sexe) et aux effets hétérotiques des croisements de souche, les variations...

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Genetic interpretation and analysis of diallel crosses with animals

Cited by 84 publications

References 19 publications

Analyses of Crossbreeding Parameters for Juvenile Body Weight in Broiler Chicken

Analyses of Crossbreeding Parameters for Juvenile Body Weight in Broiler Chicken

Estimates of Crossbreeding Parameters for Growth and Conformation Traits in Nigerian Indigenous and Exotic Pig Breeds

Age-regulated expression of genetic and environmental variation in fitness traits. 2. Genetic effects and variances for viability among crosses from a factorial mating of six selected Leghorn strains

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