Predicting Egg Quality and Egg Production Traits Using Egg Weight and Body Weight Respectively In Three Varieties of Helmeted Guinea Fowls in Humid Tropics

2015 ◽  
Vol 5 (3) ◽  
pp. 111
Author(s):  
Dozie Onunkwo ◽  
Ignatius Okoro
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Egg Quality ◽  
Humid Tropics ◽  
Production Traits ◽  
Egg Weight

scholarly journals Differences in oviposition and egg quality of various genotypes of laying hens

2017 ◽  
Vol 62 (No. 9) ◽  
pp. 377-383 ◽  
Author(s):  
E. Tůmová ◽  
J. Vlčková ◽  
D. Chodová
Keyword(s):  
Egg Production ◽  
Laying Hens ◽  
Egg Quality ◽  
Laying Hen ◽  
Sequence Length ◽  
Production Traits ◽  
Egg Weight ◽  
Egg Shell ◽  
Egg Components

The differences in egg production traits in six laying hen genotypes (brown-egg hens Bovans Brown, Bovans Sperwer, ISA Sussex; white-egg hen Dekalb White; laying hens with tinted shells Moravia Barred and Moravia BSL) and the interactions of genotype and oviposition on egg quality were evaluated. The genotype affected the laying rate (P ≤ 0.003), mean sequence length (P ≤ 0.001), and time of oviposition (P ≤ 0.001). The brown-egg genotypes laid eggs approximately 1 h earlier than the white-egg genotypes and approximately 2 h earlier than the tinted-egg genotypes. Egg shell strength was the lowest in tinted-egg genotypes (P ≤ 0.001) and declined with the time of oviposition (P ≤ 0.002). Egg shell percentage (P ≤ 0.011) and thickness (P ≤ 0.011) were affected by the interaction of genotype and oviposition. None of the effects affected egg weight; however, the proportion of egg components was significantly influenced by the interaction of genotype and oviposition. The study confirmed that the differences in the egg production and egg quality of various genotypes are associated with the laying pattern.

Estimation of genetic parameters of growth and egg production traits by animal model in IWK layer strain

2019 ◽  
Author(s):  
P. Chandan ◽  
T.K. Bhattacharya ◽  
U. Rajkumar ◽  
L.L.L. Prince ◽  
R.N. Chatterjee
Keyword(s):  
Animal Model ◽  
Body Weight ◽  
Egg Production ◽  
Heritability Estimate ◽  
The Body ◽  
Production Traits ◽  
Economic Traits ◽  
Egg Weight ◽  
Egg Number ◽  
Highly Correlated

Indian White Leghorn strain-IWK has been improved for higher egg weight as well as number over last twelve generations at ICAR-Directorate of Poultry Research, Hyderabad. The data collected on various economic traits of egg production were analyzed using REML approach of animal model. Current study showed that the heritability estimate of body weight, age at sexual maturity (ASM), egg numbers and egg weight was moderate to high, low to moderate, low and high, respectively. The body weight was positively correlated with egg weight but negatively correlated with egg numbers. The body weight at 16 and 20 weeks were negatively correlated with ASM and were very important for achieving early ASM. ASM was negatively correlated with egg numbers. The egg weight regressed as the egg number increased. The part period egg production EP52 was highly correlated with EP64; therefore EP52 can be used for selecting parents for higher egg number instead of EP64.

scholarly journals Canonical correlation analysis for studying the relationship between egg production traits and body weight, egg weight and age at sexual maturity in layers

2011 ◽  
Vol 50 (No. 4) ◽  
pp. 163-168 ◽  
Author(s):  
Y. Akbaş ◽  
Ç. Takma
Keyword(s):  
Body Weight ◽  
Correlation Analysis ◽  
Canonical Correlation Analysis ◽  
Canonical Correlation ◽  
Sexual Maturity ◽  
Egg Production ◽  
Production Traits ◽  
Egg Weight ◽  
Canonical Correlations ◽  
The Relationship

In this study, canonical correlation analysis was applied to layer data to estimate the relationships of egg production with age at sexual maturity, body weight and egg weight. For this purpose, it was designed to evaluate the relationship between two sets of variables of laying hens: egg numbers at three different periods as the first set of variables (Y) and age at sexual maturity, body weight, egg weight as the second set of variables (X) by using canonical correlation analysis. Estimated canonical correlations between the first and the second pair of canonical variates were significant (P < 0.01). Canonical weights and loadings from canonical correlation analysis indicated that age at sexual maturity had the largest contribution as compared with body weight and egg weight to variation of the number of egg productions at three different periods.  

scholarly journals Egg production and quality assessment of Nigerian indigenous chicken genotypes and their crosses with Marshall

2021 ◽  
Vol 43 (2) ◽  
pp. 28-36
Author(s):  
O. A Bassey ◽  
U Akpan ◽  
C. O. N. Ikeobi ◽  
O. A Adebambo ◽  
O.M.O Idowu
Keyword(s):  
Reproductive Performance ◽  
Egg Production ◽  
Egg Quality ◽  
Quality Trait ◽  
Quality Traits ◽  
Production Traits ◽  
Indigenous Chicken ◽  
Egg Weight ◽  
Better Than ◽  
Haugh Unit

This study focused on investigating the reproductive performance of Nigerian indigenous chickens and their crosses with Marshall. The genotypes were normal-feathered (Nn), frizzle-feathered (Ff) and naked neck (Na) chickens, while the crossbreds with Marshall (M) breed were MNn, MFf and MNa respectively (Marshall being the sire while the indigenous are dams). Data were taken on; weekly egg production, weight at first egg and age at first egg. Genotype significantly (P<0.05) influenced egg production traits. Egg weight ranged from 23.71±1.06g to 26.13±0.94g for indigenous purebreds and 39.75±0.75g to 48.06±0.57g for crossbreds. Age at first egg were 165.63±0.61 days (Nn), 170.60±0.75 days (Na) and 173.57±0.52 days (Ff), 188.71±1.67 days (MNn), 187.50±3.16 days (MNa) and 185.25±5.44 days (MFf). Also, genotype significantly (P<0.05) influenced egg quality traits. Heritability for first egg production traits were 0.37 (Nm), 0.16 (Na) and 0.66 (Fz) while heritability estimates for egg quality trait (haugh unit) were 0.14, 0.07 and 0.08 for Nm, Na and Fz birds, respectively The crossbreds performed better than the indigenous purebreds in egg production traits. The Nigerian indigenous chicken can therefore be improved upon for better egg production traits using the Marshall breed.

THE EFFECT OF PHASE-FEEDING ON EGG PRODUCTION AND EGG QUALITY OF WINTER-HOUSED WHITE LEGHORN HENS

1982 ◽  
Vol 62 (3) ◽  
pp. 887-897 ◽  
Author(s):  
N. A. CAVE ◽  
R. M. G. HAMILTON
Keyword(s):  
Body Weight ◽  
Protein Content ◽  
Egg Production ◽  
Egg Quality ◽  
Performance Criteria ◽  
Feed Consumption ◽  
White Leghorn ◽  
Egg Weight ◽  
Variable Effect

Two experiments with nine strains of Single Comb White Leghorn hens were conducted to compare laying house performance of hens given a diet of uniform protein content or a phase-feeding diet in which protein content was reduced from 156 to 148 and then to 140 g/kg at 273 and 414, or 273 and 384 days of age. Performance criteria were egg production, feed and protein intake, egg, quality, egg weight, mortality and body weight. Phase-feeding allowed reductions of 4.2 and 4.3% in protein consumption without reducing egg production, mortality or, except in one strain, body weight. There was an increase of 0.5% in feed consumption, but feed cost was reduced by 1.3%. Phase-feeding increased Haugh units by 0.3% and decreased specific gravity of eggs in one experiment, decreased percent visibly-cracked eggs in the other experiment and had no effect on percent blood spots. Depending on strain, phase-feeding had a variable effect on egg weight in exp. 1 but had no effect in the second experiment. Key words: Phase-feeding, protein utilization, egg production, hen

Comparison of body weight modification in chickens induced with the sex-linked dwarfing gene (dw) and by restricting access to food during rearing

1986 ◽  
Vol 37 (1) ◽  
pp. 99
Author(s):  
RW Polkinghorne
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Block Design ◽  
Major Influence ◽  
Free Access ◽  
Normal Female ◽  
Production Traits ◽  
Egg Weight ◽  
Dwarfing Gene ◽  
Access To Food

Related dwarf and normal female chickens were allowed restricted or free access to food from 8 to 18 weeks in order to compare the relative effects of genetic and nutritional manipulation of body weight on a number of egg production traits. Production records were collected from a total of 770 adult hens individually housed in a randomized block design. From 8 to 18 weeks dwarfs grew less efficiently than normals within both the restricted and fully fed groups. A relationship between body weight and age at first egg was shown, with dwarfs and restricted birds laying at later ages than their counterparts. Egg weight at 34 weeks was related to body weight, but dwarfs laid smaller eggs than their normal relatives even when compared at equivalent initial weights. A relationship was shown between body weight and egg weight when expressed as a proportion of body weight, which held for both genetic and nutritionally induced differences. Restricted feeding during rearing increased egg number to 66 weeks in normal birds but not in dwarfs, and dwarfs laid fewer eggs than normals. Age at first egg had a major influence on egg numbers.

Genetic variation of egg production traits in purebred and crossbred laying hens

1999 ◽  
Vol 68 (3) ◽  
pp. 433-439 ◽  
Author(s):  
B. Besbes ◽  
J. P. Gibson
Keyword(s):  
Egg Production ◽  
Egg Quality ◽  
Genetic Correlations ◽  
Egg Laying ◽  
Production Traits ◽  
Egg Weight ◽  
Partial Dominance ◽  
Dominance Variance ◽  
Stressful Environment ◽  
Model Approach

AbstractHeritabilities, dominance variation and genetic correlations (rpc) among purebred and crossbred performance were estimated for egg production (number of eggs produced between 19 and 25, 26 and 38 and 26 and 54 weeks of age) and egg quality traits (average egg weight, shell strength) in four generations of two nucleus lines of egg-laying chickens and their cross, all reared in similar environments. The within-line genetic parameters were estimated using method R applied to an animal model (approach 1) and tilde-hat approximation to restricted maximum likelihood applied to a sire-dam model (approach 2). The genetic correlation between purebred and crossbred performance as well as the crossbred heritabilities were estimated based on a multivariate sire-dam model accounting for all relationships. For egg numbers and shell strength, the purebred heritabilities were low to moderate (0·12 to 0·42). They were higher when estimated under an additive model (0·25 to 0·51) but, in general, lower than the crossbred heritabilities. For egg weight, the heritabilities were always high (0·6 to 0·7). The ratio of dominance variance to total genetic variance varied between 11 and 36% with approach 1 and 5 and 56% with approach 2, indicating a large partial dominance for egg number traits and shell strength but also the difficulty of accurately estimating the dominance variance. For these traits, the estimates of the correlation between purebred and crossbred performance, rpc, were quite high (0·8 to 0·94) which contradicts the theory that traits with larger dominance and/or difference between purebred and crossbred heritabilities present lower rpc. These high rpc estimates, coupled with the absence of obvious heterosis, indicate little advantage to be gained from use of crossbred data in genetic improvement, where pure lines and crossbreds are reared in a similar non-stressful environment.

scholarly journals Effect Of Supplementation Of Organic Acids On Laying Performance, Body Fatness And Egg Quality Of Hens

1970 ◽  
Vol 37 (2) ◽  
pp. 74-81 ◽  
Author(s):  
MS Rahman ◽  
MAR Howlider ◽  
M Mahiuddin ◽  
MM Rahman
Keyword(s):  
Body Weight ◽  
Organic Acids ◽  
Organic Acid ◽  
Feed Intake ◽  
Egg Production ◽  
Laying Hens ◽  
Egg Quality ◽  
Basal Diet ◽  
Feed Conversion ◽  
Egg Weight

The study was conducted to determine the effect of organic acids supplementation on body weight changes, feed intake, feed efficiency, egg production, egg weight and egg quality in laying hens at age between 67 and 74 weeks. A total of 48 Shaver 579 laying hens of 67 weeks age were allotted into 4 groups, each containing 12 hens. The hens were fed basal diet (17% CP and 2800 kcal ME/kg diet) supplemented with 0 (T1), 260 (T2), 520 (T3) and 780 ppm (T4) of organic acid mixture (fumaric acid and salt of butyric, propionic and lactic acids). The results revealed no effect of organic acids supplementation on body weight change and feed intake but improvement of egg production and feed conversion were observed. Organic acids supplementation significantly increased egg production by about 2.26, 8.0 and 9.84% on 260, 520 and 780 ppm respectively when compared with the untreated group (P<0.05). Feed conversion showed a significant (P<0.05) improvement in laying hen groups which fed on the basal diet supplemented with organic acids at 260, 520 and 780 ppm by about 1.85, 8.48 and 7.74% respectively when compared with the control. On the other hand, dietary organic acid had no effect on the average egg weight, while showed a lower percentage of large (P<0.05) and extra large egg (P<0.01) size compared with control group. Body composition parameters were not affected (P>0.05) by dietary treatments. Inclusion of organic acids improved egg shell thickness (P<0.05) while significantly reduced albumen index (P<0.05). Incorporation of organic acids attributed to significant increase per cent albumen (P<0.01) and significant decrease in yolk per cent (P<0.05). It can be concluded that organic acid supplementation of laying hens diet may improve persistency of lay and feed conversion. From economical point of view, it is concluded that organic acid addition (520 ppm) may result an economic benefit of layer production at older age. DOI: http://dx.doi.org/10.3329/bjas.v37i2.9884 BJAS 2008; 37(2): 74-81

Effect of flame roasting of dietary grains on the performance of leghorn hens

1994 ◽  
Vol 74 (2) ◽  
pp. 341-346 ◽  
Author(s):  
R. M.G. Hamilton
Keyword(s):  
Body Weight ◽  
Dietary Protein ◽  
Egg Production ◽  
Egg Quality ◽  
Control Diet ◽  
Productive Performance ◽  
Feed Conversion ◽  
Egg Weight ◽  
Protein Levels ◽  
Body Weights

Two experiments examined the effect on the performance of Leghorn hens given diets containing flame-roasted grains from 140 to 490 d of age. In exp. 1, the inclusion of barley, corn and wheat roasted at 121, 119 and 149 °C, respectively, had no significant (P > 0.05) effect on productive performance. Experiment 2 contained a factorial arrangement of treatments that involved two sources of dietary barley (non-roasted or flame-roasted at 154 °C), two methods of milling (hammer or roller) and two dietary protein levels (15 or 18%). Hens given the diets that contained roasted barley had lower (P < 0.01–0.001) 490-d body weights, egg production, early egg weight (196 d) and number of extra large sized eggs, and higher (P < 0.05–0.01) feed conversion, monetary returns, interior egg quality and number of medium sized and grades B and C eggs than those fed the non-roasted barley control diet. Mortality, the number of large-sized eggs and egg weights, feed conversion and the occurrence of blood spots were higher (P < 0.05–0.001) while the number of medium-sized eggs was lower (P < 0.05–0.001) when the hens were fed roller compared with hammer-milled grains. Hens given the 18% protein-containing diets had higher (P < 0.05–0.01) 490 d body weight, egg production, monetary returns and numbers of small sized and grades B and C eggs, but lower (P < 0.05) mortality than those receiving the diets that contained 15% protein. Key words: Flame roasting, dietary grains, Leghorn hens

scholarly journals ASSOCIATION BETWEEN BODY WEIGHT AND SOME EGG PRODUCTION TRAITS IN A STRAIN OF COMMERCIAL LAYER

2021 ◽  
Vol 15 ◽  
pp. 119-125
Author(s):  
K. L. AYORINDE ◽  
A. A. TOYE
Keyword(s):  
Body Weight ◽  
Shell Thickness ◽  
Egg Production ◽  
Production Traits ◽  
Egg Weight ◽  
Weight Range ◽  
Quadratic Equations ◽  
Satisfactory Performance ◽  
Body Weights ◽  
Egg Number

Fifty 28 weeks old layers were reared in individual cages for 9 Weeks to detect the effect weight has on some production traits. Body Weight was positively though non- significantly (P.0.05) correlated with egg number, egg weight and negatively with Shell thickness (r =-0.12) and egg index (r=-0.15). Estimates of optimum 28-week body weights, as determined from second-degree (quadratic) equations, indicated that for satisfactory performance a body weight range of 1728 to 1814g is required, Breeding and good management especially feeding are thought to be capable of maintaining this weight range.

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