Genetic, phenotypic and environmental relationships of fertility and hatchability with other economic traits in White Leghorns

Chaudhary, M.L.; Sandhu, J. S.; Brah, G.S.

doi:10.1111/j.1439-0388.1987.tb00120.x

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…Hence, over the last decades a breeders' interest has focused on genetic improvement of egg production traits. This, however, might be associated with an unfavourable correlated genetic response of others traits (Chaudhary et al, 1987). Sewalem et al (1998) showed that in some lines fertility and hatchability were impaired by selection for egg production.…”

Section: Introductionmentioning

confidence: 99%

Bayesian estimates of genetic variance of fertility and hatchability under a threshold animal model

Dobek¹,

Szydłowski²,

Szwaczkowski³

et al. 2003

J. Anim. Feed Sci.

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The genetic variability of fertility and hatchability of laying hens were studied in four strains under long-term selection for productive traits. Data were collected over nine generations. The total number of individuals recorded per strain ranged from 2015 to 5386. The traits were analysed as binary characters under the threshold animal model using Gibbs sampling. The point estimates of heritability of fertility were relatively high and ranged from 0.38 to 0.46. The estimates for hatchability were lower and ranged from 0.22 to 0.24. All the strains showed positive genetic trends.

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Section: Introductionmentioning

confidence: 99%

Bayesian estimates of genetic variance of fertility and hatchability under a threshold animal model

Dobek¹,

Szydłowski²,

Szwaczkowski³

et al. 2003

J. Anim. Feed Sci.

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“…S ewalem et al (1998) reported that line EW exhibited lower fertility and hatchability than lines selected for increased egg number. The existence of negative genetic correlation between egg size and fertility and hatchability was reported by (K inney , 1969; H unton , 1971; L iljedahl et al 1979 and C haudhary et al 1987). The mechanism through which the egg size affects fertility and hatchability might be associated with changes in macro‐composition of the egg as a consequence of selection for increased egg size.…”

Section: Methodsmentioning

confidence: 71%

“…In this respect, selection for egg mass as observed in this study might avoid the shift in population mean of egg size. Low but positive genetic correlations between hat‐chability and egg number were also estimated by (H unton , 1971; L iljedahl et al 1979; F airfull and G owe , 1990 and C haudhary et al 1987).…”

Section: Methodsmentioning

confidence: 88%

“…Estimates of additive genetic variance components and resulting heritabilities for egg production traits abound in literature (K inney 1969; L iljedahl et al 1979, I be and H ill 1988; F airfull and G owe 1990; J orjani et al 1993; W ei and van der W erf 1993; K oerhuis and M c K ay 1996; J eyaruban and G ibson 1996). On the other hand, published results on additive genetic variance components of reproductive traits and their relationship with other egg production traits in layers are limited (H unton 1971; L iljedahl et al 1979; C haudhary et al 1987; S ewalem et al 1998). Therefore, the objectives of the present study were (1) to assess fertility and hatchability in three lines selected for different egg production traits and one control line; (2) to estimate (co)variances and the resulting genetic and phenotypic correlations between reproduction and egg production traits; and (3) to estimate genetic trends of production and reproduction traits in the above lines.…”

Section: Introductionmentioning

confidence: 99%

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Are reproductive traits impaired by selection for egg production in hens?

Sewalem

Johansson

Carlgren

et al. 1998

J Animal Breeding Genetics

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Summary The data consisted of information on egg production traits (age at first egg, egg number and egg weight), and reproduction traits such as percentage fertile eggs (PF), percentage hatched of fertile eggs (PHF) and percentage hatched of total egg set (PHT) were also recorded for the selected parents. The experiment was carried out for 10 generations of selection for increased egg number (EN), egg weight (EW), egg mass (EM) along with a control line (C). Although line C had high PF, PHF and PHT in most generations compared to the selected lines, it was not significantly better than the EN and EM lines at the last generation. Differences in PF, PHF and PHT were also observed among the selected lines. The lowest performances of PF, PHF and PHT was observed in line EW. (Co)variances and resulting correlations were estimated between egg production and reproduction traits using a multivariate animal model. The result showed that the estimates of heritability values for egg production traits were moderate to high and low for reproduction traits. The genetic correlation between PF and egg weight traits in line EW was negative and positive in line EM. PHF was positively correlated with egg number in line EN and negatively correlated with egg weight in line EW. Genetic trends calculated from the animal model showed that direct selection for increased egg number in line EN, egg weight in line EW and egg mass in line EM has resulted in substantial genetic gain over generations. Moreover, in lines selected for egg number and egg mass there were consistent positive genetic trends of PHF and PHT along with the selected trait. Selection for increased egg weight, however, negatively affected PF, PHF and PHT over generations. Zusammenfassung Wird Reproduktion durch Selektion auf Legeleistung verschlechtert? Produktionsdaten waren Alter bei Legebeginn, Eizahl und Eigewicht, Reproduktion wurde durch %fruchtbarer Eier (PF) %Schlupf fruchtbarer Eier (PHF) und %Gesamtschlupf (PHT) bei selektierten Elterntieren erfasst. In drei Linien wurde durch 10 Generationen entweder auf Eizahl (EN), Eigewicht (EW) oder Eimasse (EM) selektiert und eine Kontollinie paralell vermehrt. Obwohl C überlegen in Reproduktion war, fehlte statistische Signifikanz in Vergleich zu EN und EM in der letzten Generation. Die selektierten Linien unterschieden sich ebenfalls in Reproduktionseigenschaften, wobei diese in Linie EW am schlechtesten waren. (Co)Varianzen wurden mittels eines multivariaten Modells zwischen Produktions‐ und Reproduktionsmerkmalen geschätzt. Die genetische Korrelation zwischen EW und PF war in EW negativ aber positiv in EM. Heritabilitaten waren mittel bis hoch für Produktions‐ und gering für Reproduktionsmerkmale. PHF war mit Eizahl in der EN Linie positiv und negativ mit EW in der EW Linie korreliert. Die mittels Tiermodell geschätzten genetischen Trends zeigten erhebliche Gewinne bei direkt selektierten Merkmalen in den drei Linien und in Linien EN und EM konsistent positive Trends für PHF und PHT, während in Linie EW sich PF, PHF u...

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“…A number of investigations concerning the fertility and hatchability have been conducted in layer populations (Chaudary et al, 1987;Hartmann, 2001). It is known that the development of a chicken embryo depends on the egg environment during incubation.…”

Section: Introductionmentioning

confidence: 99%

Impact of data transformation on the heritability estimates of reproductive traits in laying hens

Piotrowski¹,

Szwaczkowski²

2002

J. Anim. Feed Sci.

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Two reproductive traits: percentage of fertilized egg (PFE) and percentage of hatched of set eggs (PHC) of four strains of laying hens (15 339 recorded individuals) over nine generations from pedigree farm were studied. The computations for three type of data sets for each trait (untransformed, arcsinsqrt transformed, probit transformed data) were used to estimate direct and maternal genetic variances within strains. Prior to analysis each observation was divided by the average. Error variance estimates and logarithms of likelihood were taken as comparison criteria. Generally, the reproductive traits are low heritable. Negligible differences between direct heritability estimates of PFE have been registered. However, these estimates obtained from untransformed data were larger than the transformed ones. Generally, smaller residual variances have been received from arcsinsqrt transformed data (in a majority of cases, largest error variances were estimated from probit transformed data). It usually corresponds with the second of the employed criteria.

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Genetic, phenotypic and environmental relationships of fertility and hatchability with other economic traits in White Leghorns

Cited by 6 publications

References 8 publications

Bayesian estimates of genetic variance of fertility and hatchability under a threshold animal model

Bayesian estimates of genetic variance of fertility and hatchability under a threshold animal model

Are reproductive traits impaired by selection for egg production in hens?

Impact of data transformation on the heritability estimates of reproductive traits in laying hens

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