Long-term selection using a single trait criterion, non-destructive deformation, in White Leghorns: Effect over time on genetic parameters for traits related to egg production

2016 ◽  
Vol 88 (2) ◽  
pp. 222-230
Author(s):  
Olivier Gervais ◽  
Keijiro Nirasawa ◽  
Christian E. Vincenot ◽  
Yoshitaka Nagamine ◽  
Kazuyuki Moriya
Keyword(s):  
Egg Production ◽  
Genetic Parameters ◽  
Term Selection ◽  
White Leghorns ◽  
Non Destructive ◽  
Over Time

scholarly journals Genetic evaluation of laying hens under fixed regression animal models

2007 ◽  
Vol 50 (3) ◽  
pp. 279-287
Author(s):  
A. Wolc ◽  
M. Lisowski ◽  
T. Szwaczkowski
Keyword(s):  
Animal Models ◽  
Akaike Information Criterion ◽  
Regression Models ◽  
Egg Production ◽  
Genetic Parameters ◽  
Laying Hens ◽  
Information Criterion ◽  
Genetic Evaluation ◽  
Term Selection

Abstract. Monthly egg production in laying hens was studied under fixed regression models. The data of 37071 birds from three strains under long term selection were analysed. The covariates from four production curves were included in nested and non-nested form. From linearized functions the model of Ali and Schaeffer most adequately described the egg production. Akaike Information Criterion favoured models with nested covariates. The following genetic parameters were estimated: heritability 0.02–0.2, 0.03–0.06, 0.03–0.20 repeatability 0.11–0.23, 0.21–0.30, 0.34–0.43 for A22, A88 and K66 lines, respectively. In conclusion, regression models could be considered in genetic evaluation of laying hens.

scholarly journals Effect of Long-Term Selection for Non-Destructive Deformation on Egg Shape in White Leghorns

2016 ◽  
Vol 53 (4) ◽  
pp. 249-256 ◽  
Author(s):  
Olivier Gervais ◽  
Keijiro Nirasawa ◽  
Christian E. Vincenot ◽  
Yoshitaka Nagamine ◽  
Kazuyuki Moriya
Keyword(s):  
Term Selection ◽  
Egg Shape ◽  
White Leghorns ◽  
Selection For ◽  
Non Destructive

Non-Destructive Analysis of 14th–19th Century European Handmade Papers

2016 ◽  
Vol 37 (2) ◽  
Author(s):  
Timothy Barrett ◽  
Mark Ormsby ◽  
Joseph B. Lang
Keyword(s):  
Calcium Carbonate ◽  
19Th Century ◽  
Calcium Concentration ◽  
Natural Ageing ◽  
Destructive Analysis ◽  
Non Destructive ◽  
Over Time

AbstractNon-destructive analysis of 1,578 paper specimens made between the fourteenth and the nineteenth centuries was undertaken in an effort to better understand changes in paper composition over time and how these variations might affect paper stability during long term natural ageing. Gelatine content and colour were determined using UV/Vis/NIR spectrometry. Residual metals were measured using XRF. These components included potassium and sulfur as elements indicative of alum concentration; iron as a typical paper contaminant; and calcium, which is often associated with compounds such as calcium carbonate that can serve as alkaline reserves. The research demonstrated that papers that are lighter in colour (closer to white) are associated with higher levels of gelatine and calcium, and lower levels of iron. The survey also showed significant decreases in gelatine and calcium concentration over time with the largest differences coinciding with the rise of printing around 1500. The drop in pH over the centuries observed by other researchers is explained by the decreases in these two components rather than by a rise in alum concentration, which remained fairly stable. The craftsmanship of the specimens was evaluated using materials and workmanship ratings which showed better quality paper associated with higher gelatine and calcium concentrations and colour closer to white. Poorer quality papers were associated with higher iron levels and greater thickness.

Effect of long term selection for juvenile body weight and egg production on semen quality in broiler breeder dam line

2017 ◽  
Vol 52 (2) ◽  
pp. 222
Author(s):  
M. Shanmugam ◽  
M. Niranjan ◽  
K. Rakesh ◽  
T.K. Bhattacharya ◽  
B.L.N. Reddy ◽  
...  
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Semen Quality ◽  
Broiler Breeder ◽  
Term Selection ◽  
Selection For

scholarly journals Effect of long-term selection for egg production on eggshell quality of Japanese quail (Coturnix japonica)

2016 ◽  
Vol 95 (11) ◽  
pp. 2570-2575 ◽  
Author(s):  
M.M. Fathi ◽  
A.E. El-Dlebshany ◽  
M. Bahie El-Deen ◽  
L.M. Radwan ◽  
G.N. Rayan
Keyword(s):  
Japanese Quail ◽  
Egg Production ◽  
Coturnix Japonica ◽  
Term Selection ◽  
Eggshell Quality ◽  
Selection For

scholarly journals Estimation of Additive and Non-Additive Genetic Variances of Body Weight, Egg Weight and Egg Production for Quails (Coturnix coturnix japonica) with an Animal Model Analysis

2006 ◽  
Vol 49 (3) ◽  
pp. 300-307 ◽  
Author(s):  
N. Mielenz ◽  
R. R. Noor ◽  
L. Schüler
Keyword(s):  
Animal Model ◽  
Body Weight ◽  
Egg Production ◽  
Additive Model ◽  
The Body ◽  
Phenotypic Variance ◽  
Egg Weight ◽  
Term Selection ◽  
Inbreeding Coefficients

Abstract. This study estimates the additive and non-additive variances for egg production and body weight traits of two lines of quails from a long-term selection with the help of the REML method. For the body weight of 42-day-old females (BW42f) and males (BW42m), a total of 7,934 records for line 1 and 7,214 records for line 2 from 21 generations were used in our analyses. Additionally, 1,717 records of females from line 1 and 1,671 records of females from line 2 contained information on their egg production at an age of 42 to 200 days (EN200), on the average egg weight for the first 11 weeks of their laying season (EW1), on the average egg weight from weeks 12 to 23 (EW2), and on their body weight at an age of 200 days (BW200f). A multivariate additive animal model and one-trait dominance models, which include the inbreeding coefficients as covariates, were fitted to the data. The estimates of the heritability gained from our dominance models were smaller than those from the additive model. For line 1, the heritability values decreased for EN200 from 0.35 to 0.32, for EW1 from 0.66 to 0.56, for BW200f from 0.42 to 0.38, and for BW200m from 0.51 to 0.49, respectively. For the first line, the respective ratio (d2) of the dominance variance to the phenotypic variance for EN200, EW1, BW200f and BW200m was 0.08, 0.22, 0.09 and 0.21, and the values for the second line were 0.12, 0.06, 0.001 and 0.23.

scholarly journals Direct and Correlated Responses to Long-Term Selection for Increased Body Weight and Egg Production in Turkeys

1996 ◽  
Vol 75 (10) ◽  
pp. 1180-1191 ◽  
Author(s):  
KARL E. NESTOR ◽  
D.O. NOBLE ◽  
J. ZHU ◽  
Y. MORITSU
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Correlated Responses ◽  
Term Selection ◽  
Selection For
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