Body weight and egg weight dynamics in layers

Masso, Ricardo José Di; Dottavio, AM; Canet, Zulma Edith; Mt, Font

doi:10.1093/ps/77.6.791

Cited by 12 publications

(8 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Feed conversion is also useful for measuring livestock productivity because feed conversion is a comparison between the ration consumed and the resulting weight gain. The higher the value of ration conversion indicates the more ration needed to increase body weight per unit weight and the lower the value of ration conversion means the quality of ration is getting better [14,15]. More and more a low conversion to ration, it means livestock is more efficient in using rations.…”

Section: Deuteronomy (G)mentioning

confidence: 99%

The Effect of Giving Breadfruit Leaf Flour (Artocarpus Altilis) on the Productivity of Laying Hens

Lestari¹,

Telebe²,

Sapsuha³

2020

Proceedings of the 5th International Conference on Food, Agriculture and Natural Resources (FANRes 2019)

View full text Add to dashboard Cite

Laying hens are adult hens that are kept specifically for their eggs. The origin of laying hens is from the partridge which is dominated and selected so that it spawns quite a lot. The direction of selection of jungle fowl is indicated by the many producers. This study aims to determine the effect of breadfruit leaf flour (Artocarpus Altilis) in different rations on body weight gain, consumption and conversion of starter phase laying chicken rations in Jan Tabona Kelurahan, South Ternate, the method used was an experimental method using a Completely Randomized Design (CRD). The parameters observed in this study were performance of laying hens, ration consumption, body weight gain, feed conversion and egg physical quality. If there are significant differences between treatments will be followed by the Least Significant Difference Test (LSD).

show abstract

Section: Deuteronomy (G)mentioning

confidence: 99%

The Effect of Giving Breadfruit Leaf Flour (Artocarpus Altilis) on the Productivity of Laying Hens

Lestari¹,

Telebe²,

Sapsuha³

2020

Proceedings of the 5th International Conference on Food, Agriculture and Natural Resources (FANRes 2019)

View full text Add to dashboard Cite

show abstract

“…The maternal effects reduce as chicken are older (Barbieri et al, 2015;Maniatis et al, 2013;Norris & Ngambi, 2006). Another maternal effect, age of hen, may also affect BW because strong correlations between hen age and egg weight and strong correlations between egg weight and broiler BW especially at an early age were found (Di Masso, Dottavio, Canet, & Font, 1998;Tahir, Cervantes, Farmer, Shim, & Pesti, 2011;Whiting & Pesti, 1984). Failing to account for maternal effects results in reduced accuracy of selection, overestimated direct additive genetic effect and thus loss of selection response (Roehe & Kennedy, 1993).…”

Section: Introductionmentioning

confidence: 99%

Genetic analysis on body weight at different ages in broiler chicken raised in commercial environment

Chu

Madsen

Norberg

et al. 2019

J Animal Breeding Genetics

View full text Add to dashboard Cite

A multivariate model was developed and used to estimate genetic parameters of body weight (BW) at 1–6 weeks of age of broilers raised in a commercial environment. The development of model was based on the predictive ability of breeding values evaluated from a cross‐validation procedure that relied on half‐sib correlation. The multivariate model accounted for heterogeneous variances between sexes through standardization applied to male and female BWs differently. It was found that the direct additive genetic, permanent environmental maternal and residual variances for BW increased drastically as broilers aged. The drastic increase in variances over weeks of age was mainly due to scaling effects. The ratio of the permanent environmental maternal variance to phenotypic variance decreased gradually with increasing age. Heritability of BW traits ranged from 0.28 to 0.33 at different weeks of age. The direct genetic effects on consecutive weekly BWs had high genetic correlations (0.85–0.99), but the genetic correlations between early and late BWs were low (0.32–0.57). The difference in variance components between sexes increased with increasing age. In conclusion, the permanent environmental maternal effect on broiler chicken BW decreased with increasing age from weeks 1 to 6. Potential bias of the model that considered identical variances for sexes could be reduced when heterogeneous variances between sexes are accounted for in the model.

show abstract

“…Numerous previous studies suggested that egg weight showed a curvilinear relationship with the increase of hen age (Di Masso et al, 1998;Suk and Park, 2001;Nangsuay et al, 2011;Tumova and Gous, 2012), and provided critical insights into controlling the increase rate of egg weight (Minvielle et al, 1994). However, these authors only evaluated the tendency and increment of egg weight between different weeks of age, lacking full evaluation of their genetic basis.…”

Section: Introductionmentioning

confidence: 99%

Genetic analysis for dynamic changes of egg weight in 2 chicken lines

Liu

et al. 2014

Poultry Science

View full text Add to dashboard Cite

One of the main concerns for poultry producers is how to maintain egg uniformity and stability in size and weight following the rapid growth during the early laying period. In this study, we aimed to investigate the increase in egg weight with advancing hen age, and to estimate genetic parameters of these increment traits in 2 pure lines of chickens (i.e., 2,010 White Leghorn and 1,200 brown-egg dwarf hens), using the restricted maximum likelihood method with the DMU procedure. We collected age at first egg (AFE), first egg weight (FEW) and kept records of egg weight per 10 wk from 30 to 60 wk of age. Meanwhile, the increments of egg weight were calculated for the evaluation of age-dependent dynamic changes. The increment of egg weight gained dramatically before 30 wk of age and became slower with the advance of age. Heritability estimates of AFE were larger than 0.32, and the low to moderate genetic correlations between AFE and FEW were observed in the 2 lines. The FEW showed high variation level compared with egg weights at later ages in the 2 lines, and had moderate heritability estimates in White Leghorns (0.20) and dwarf hens (0.33). Egg weights at different ages were highly heritable in the 2 lines (h(2) ≥ 0.35), and had strong genetic and phenotypic correlations among different ages. The estimates of heritability for most increment traits were low to moderate, especially those increments for 10-wk intervals ranging from 0.00 to 0.14. The genetic correlations among 3 consecutive egg weight increments for 10-wk intervals were low to moderate. Our results in the 2 lines should provide important insights into the genetic architecture of increment traits and offer some suggestions for producing uniform and stable eggs in response to advancing age.

show abstract

Body weight and egg weight dynamics in layers

Cited by 12 publications

References 26 publications

The Effect of Giving Breadfruit Leaf Flour (Artocarpus Altilis) on the Productivity of Laying Hens

The Effect of Giving Breadfruit Leaf Flour (Artocarpus Altilis) on the Productivity of Laying Hens

Genetic analysis on body weight at different ages in broiler chicken raised in commercial environment

Genetic analysis for dynamic changes of egg weight in 2 chicken lines

Contact Info

Product

Resources

About