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

Sewalem, A.; Johansson, Kjell; Carlgren, A.-B.; Wilhelmson, Martin; Lillpers, K.

doi:10.1111/j.1439-0388.1998.tb00349.x

Cited by 15 publications

(5 citation statements)

References 31 publications

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“…This is in contrast to many breeds of domesticated chickens, whose reproductive activity is limited to egg production as a result of commercial practices (e.g. photoperiod manipulation, egg removal) and decreases in broodiness, hatchability and fertility as a consequence of selection for increased egg production (Emmerson et al, 1991;Nestor et al, 1996;Sewalem et al, 1998) (reviewed by Romanov, 2001). Therefore, given that non-domesticated, laying females must ensure that they have adequate resources to perform post-laying parental behaviours, they may limit lipid allocation to current egg production in exchange for allocating more energy towards self-maintenance (i.e.…”

Section: Metabolic Shifts In Vldl Particle Diameter Distributionmentioning

confidence: 99%

Characterization of very-low density lipoprotein particle diameter dynamics in relation to egg production in a passerine bird

Salvante

Lin

Walzem

et al. 2007

Journal of Experimental Biology

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SUMMARY During avian egg production, oestrogen mediates marked increases in hepatic lipid production and changes in the diameter of assembled very-low density lipoprotein (VLDL). A nearly complete shift from generic VLDL (∼70 nm in diameter), which transports lipids to peripheral tissues, to yolk-targeted VLDL (VLDLy) (∼30 nm), which supplies the yolk with energy-rich lipid, has been observed in the plasma of laying domestic fowl. We validated an established dynamic laser scattering technique for a passerine songbird Taeniopygia guttata, the zebra finch, to characterize the dynamics of VLDL particle diameter distribution in relation to egg production. We predicted that non-gallinaceous avian species that have not been selected for maximum egg production would exhibit less dramatic shifts in lipid metabolism during egg production. As predicted, there was considerable overlap between the VLDL particle diameter distributions of laying and non-laying zebra finches. But unexpectedly, non-laying zebra finches had VLDL diameter distributions that peaked at small particles and had relatively few large VLDL particles. As a result, laying zebra finches, in comparison, had diameter distributions that were shifted towards larger VLDL particles. Nevertheless,laying zebra finches, like laying chickens, had larger proportions of particles within proposed VLDLy particle diameter ranges than non-laying zebra finches (e.g. sVLDLy: 50% vs 37%). Furthermore, zebra finches and chickens had similar modal (29.7 nm in both species) and median (32.7 nm vs 29.6 nm) VLDL particle diameters during egg production. Therefore,although zebra finches and chickens exhibited opposing directional shifts in VLDL particle diameter distribution during egg production, the modifications to VLDL particle structure in both species resulted in the realization of a common goal, i.e. to produce and maintain a large proportion of small VLDL particles of specific diameters that are capable of being incorporated into newly forming egg yolks.)

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Section: Metabolic Shifts In Vldl Particle Diameter Distributionmentioning

confidence: 99%

Characterization of very-low density lipoprotein particle diameter dynamics in relation to egg production in a passerine bird

Salvante

Lin

Walzem

et al. 2007

Journal of Experimental Biology

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“…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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“…Typically the heritability estimates of the reproduction traits are low and ranged between 0.02–0.36 for different poultry species (Sewalem et al . ; Poivey et al . ; Brun & Larzul ; Wolc et al .…”

Section: Discussionmentioning

confidence: 99%

Genetic evaluation of reproductive potential in the Zatorska goose under a conservation program

Graczyk

Andres²,

Kapkowska³

et al. 2018

Animal Science Journal

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The aim of this study was to estimate the genetic parameters and inbreeding effect on the fertility, embryo mortality and hatchability traits in the Zatorska goose covered by the animal genetic resources conservation program. The material for this study contains information about results of hatching of 18 863 eggs from 721 dams and 168 sires, laid between 1998-2015. Genetic parameters were estimated based on the threshold animal model by the use of Restricted Maximum Likelihood and Gibbs sampling. The percentage of fertilized eggs ranged yearly between 37-80%. The percentage of embryo mortality was very low, ranging between 4.63-23.73%. The percentage of the hatched goslings from the total number of analyzed eggs was on average 33.18%, and 53.72% from fertilized eggs. On average based on both methods, the heritability estimates of the fertility, embryo mortality and hatchability reached 0.36, 0.07, 0.24 for males and 0.44, 0.11, 0.32 for females. The genetic trend had increasing tendency for fertility and hatchability and was stable for embryo mortality for both sexes. The obtained result shows that the Zatorska goose can be still maintained in the reserves of the local gene pool according to current rules and use in the local market as a breed with good reproductive potential.

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

Cited by 15 publications

References 31 publications

Characterization of very-low density lipoprotein particle diameter dynamics in relation to egg production in a passerine bird

Characterization of very-low density lipoprotein particle diameter dynamics in relation to egg production in a passerine bird

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

Genetic evaluation of reproductive potential in the Zatorska goose under a conservation program

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