EFFECT OF EARLY SELECTION FOR BODY WEIGHT, KEEL LENGTH AND BREAST CIRCUMFERENCE ON EGG PRODUCTION TRAITS IN INSHAS STRAIN OF CHICKENS

2016 ◽  
Vol 36 (2) ◽  
pp. 375-387
Author(s):  
R.Sh. Abou El-Ghar ◽  
Ragaa Abd El-Karim
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Early Selection ◽  
Production Traits ◽  
Selection For

Multi-trait selection for body weight, egg production and total fat in the Chinese and Synthetic strains of geese

2004 ◽  
Vol 84 (2) ◽  
pp. 197-209 ◽  
Author(s):  
J. N. B. Shrestha ◽  
A. A. Grunder ◽  
J. W. Dickie
Keyword(s):  
Body Weight ◽  
Female Body ◽  
Egg Production ◽  
Animal Research ◽  
Production Traits ◽  
Genetic Response ◽  
Chinese Strain ◽  
Male And Female ◽  
Selection For ◽  
Total Fat

The Chinese and Synthetic (assembled from Pilgrim, Chinese and Hungarian) strains raised at the Greenbelt farm of the Centre for Food and Animal Research (formerly Animal Research Centre, and Animal Research Institute) located in Ottawa, Canada, had been subjected to 12 yr of random mating. From 1982 onwards, these two strains were selected for five generations in order to increase egg production over a 24- wk laying period and body weight at 16 wk of age, and to simultaneously decrease total fat (abdominal and intestinal). At the same time, Randombred Chinese and Synthetic strains were maintained during the course of selection to monitor year-to-year trends in the production traits. In both the Randombred strains, body weights at 9 and 16 wk of age remained stable (P > 0.05) during the course of the study. In the Selected Chinese strain, five generations of selection increased male and female body weight at 1 6 wk of age by 0.181 ± 0.024 and 0.165 ± 0.009 kg/generation, respectively, (P < 0.05), while egg production increased by 1.3 ± 0.73 eggs/generation (P > 0.05). Concurrently, in the Selected Synthetic strain, male and female body weight at 16 wk of age increased by 0.085 ± 0.028 (P < 0.10) and 0.084 ± 0.024 kg/generation (P < 0.05), respectively, while egg production increased by 1.1 ± 0.87 eggs/generation (P > 0.05). In Generation 6, measures of the abdominal, intestinal and total fat increased significantly in the Selected Chinese strain when compared to the Randombred Chinese strain, whereas the Selected and Randombred Synthetic strains were similar (P > 0.05). Correlated responses to selection were observed for body weight at slaughter, eviscerated carcass weight, dressing percentage, weights of the liver and neck, as well as fertility and hatchability traits. In the Selected Chinese strain, the genetic response to selection estimated as a deviation from the Randombred Chinese strain from Generation 2 to 6 for male and female body weight at 16 wk of age were 0.17 ± 0.03 and 0.13 ± 0.02 kg/generation, respectively (P < 0.05). Corresponding estimates of genetic response in the Selected Synthetic strain as a deviation from the Randombred Synthetic strain were 0.04 ± 0.01 and 0.05 ± 0.01 kg/generation, respectively (P < 0.05). In light of the variable results on fatness in the two Selected strains assessed, there is a need for further studies on response to selection for reduced abdominal and intestinal fat. Therefore, selection studies based on a larger number of geese are warranted to sustain goose breeding. Nevertheless, it is evident that multi-trait selection for egg production and body weight offers one of the most practical means for rapid and permanent improvement of economically important production traits in commercial goose breeding. Key words: Chinese strain, Synthetic strain, selection, body weight, egg production, abdominal and intestinal fat

scholarly journals DOMINANCE AND EPISTASIS IN HETEROSIS OF WHITE LEGHORN STRAIN CROSSES

1987 ◽  
Vol 67 (3) ◽  
pp. 663-680 ◽  
Author(s):  
R. W. FAIRFULL ◽  
R. S. GOWE ◽  
J. NAGAI
Keyword(s):  
Body Weight ◽  
Sexual Maturity ◽  
Egg Production ◽  
Significant Contribution ◽  
Production Traits ◽  
White Leghorn ◽  
Cross Combination ◽  
Commercial Strain ◽  
Better Than

Four unrelated pure strains of White Leghorns including a grandparent strain from industry and 12 two-strain, 24 three-strain, 24 four-strain and 12 F2 strain crosses produced contemporaneously were used to examine the role of dominance and epistasis in heterosis. A control strain and a commercial strain were also included. For egg weight, the heterosis observed closely approximated that expected due to dominance alone. For sexual maturity and body weight, dominance was the major component of heterosis, but epistasis made a significant contribution — additive by additive (A × A) genetic effects for sexual maturity and 140-d body weight, and parental epistasis for mature body weight. Both dominance and epistasis played a significant role in heterosis for egg production traits. A × A, dominance by dominance (D × D) and additive by dominance (A × D) epistasis were all important for hen-housed egg production and hen-housed egg yield. For hen-day rate of egg production, A × A epistasis was significant only early in the laying year (to 273 d), A × D and D × D were significant to 385 d and in the full year (to 497 d); however, none (A × A, A × D and D × D) was significant near the end of lay (386–497 d). Overall heterosis estimates for full year egg production measured as hen-housed egg production to 497 d or hen-day rate from housing to 497 d clearly showed that on average two-strain crosses were superior to three-strain crosses which were superior to four-strain crosses which in turn exceeded the F2 crosses. Nevertheless, several three-strain crosses had performance for egg production that was equal to or better than the two-strain cross with the highest egg production. Thus, in commerce, where the level of egg production is of great economic importance, the testing and use of a specific three-way cross combination will usually result in a better commercial product. Key words: Heterosis, egg production genetics, epistasis, stocking rate, strain cross, White Leghorn

scholarly journals Performance Evaluation of Kuroiler and Sasso Chicken Breeds Reared under On-farm and On-station Management Conditions in Tanzania

2021 ◽  
Vol 3 (2) ◽  
pp. 53-59
Author(s):  
Fadhili S. Guni ◽  
Said H. Mbaga ◽  
Andalwisye M. Katule
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Linear Models ◽  
Farm Management ◽  
General Effect ◽  
Production Traits ◽  
Gxe Interaction ◽  
Live Body Weight ◽  
Egg Production Rate ◽  
On Farm

A study was conducted to evaluate the effect of management, breed, and their interaction on growth performance, egg production, and survivability under on-station and on-farm management conditions in Tanzania. A total of 1200 chicks, 600 for each breed, Kuroiler, and Sasso of mixed sexes were used. Birds under on-station management were confined and fed commercial ration throughout the experiment while those under on-farm management were allowed to semi-scavenge and supplemented with available feeds in the household. Brooding was carried out on-station for six weeks. Thereafter, birds were sub-divided for on-station and on-farm evaluation where data on body weight, egg production traits, and survival rate were taken at different ages from week 6 up to 52. The General Linear Models procedure fitting management, breed, and interaction between management and breed was used to analyze the data. Results show that management conditions had a significant influence on the performance of the breeds. Birds reared on-station performed better in all traits measured than those reared on-farm. The general effect of the breed was significant only for hen-day egg production (HDEP %) and hen-housed egg production (HHEP) in favour of Sasso chickens. Similarly, Sasso was more efficient at converting feed to live body weight. Interactions between management and breed were observed for all traits except peak egg production rate and mortality rate. While Sasso performance was better than that of Kuroiler on body weight, age at first egg, HDEP, age at peak egg production, and HHEP under the on-station management system, their performance in these traits were similar under the on-farm management except for body weight and age at first egg where Kuroiler was superior to Sasso. The survivability was also higher for Kuroiler than for Sasso under both management systems. It is concluded that genotype by environment (GxE) interaction had significant effects on the performance of the two breeds thus, a need to consider such effect when promoting them for either on-station or on-farm rearing.

scholarly journals Heritability Estimates of Adult Body Weight and Egg Production Traits in Indigenous Uttara Chickens

2018 ◽  
Vol 10 (2) ◽  
pp. 357 ◽  
Author(s):  
M. K. Singh ◽  
S. Kumar ◽  
R. K. Sharma ◽  
S. K. Singh ◽  
B. Singh ◽  
...  
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Production Traits ◽  
Adult Body ◽  
Adult Body Weight ◽  
Heritability Estimates

Alterations in plasma constituents, growth and egg production traits due to selection in three genotypes of Japanese quail

2018 ◽  
Vol 156 (1) ◽  
pp. 118-126 ◽  
Author(s):  
G. S. Farahat ◽  
B. Y. Mahmoud ◽  
E. M. El-Komy ◽  
E. A. El-Full
Keyword(s):  
Body Weight ◽  
Japanese Quail ◽  
Egg Production ◽  
Body Weight Gain ◽  
Egg Mass ◽  
Production Traits ◽  
Total Lipids ◽  
Laying Performance ◽  
Productive Traits ◽  
And Control

AbstractThe present investigation was carried out to estimate the effects of genotype and sex on growth and laying performance and assess the variations in plasma constituents in the tested genotypes and their relations with productive traits after four generations of selection. Data of growth and laying performance on 1440 females and males of Japanese quail were taken from the three quail genotypes: maternal (MG), long shank length (LSG28) and control (CG) genotypes. Genotype significantly affected all studied growth productive traits, favouring selected genotypes. The LSG28surpassed MG in total protein, albumin (Alb), globulin (Glob), triglycerides and Alb/Glob ratio and lowered both cholesterol and total lipids (TL). Sex significantly favoured females, which had higher body weight, longer shank length at 35 days of age and higher body weight gain during the period from 1 to 35 days of age. Females showed significantly higher concentrations of both Alb and TL than males. The MG exceeded LSG28in fertility and hatchability per cent. Correlations for both growth and productive traits with plasma constituents revealed inconsistent trends in either magnitude or direction. Four generations of selection resulted in substantial phenotypic improvements in most growth and productive traits, as well as plasma constituents studied in LSG28, and favoured MG in maturity, days needed to produce the first ten eggs, higher egg production per cent and heavier egg mass.

scholarly journals Effect of Selection for Weight of Early Eggs on Egg Production Traits in Japanese Quail

2015 ◽  
Vol 9 (4) ◽  
pp. 179-190 ◽  
Author(s):  
Mohamed Bahie El- Deen ◽  
Ayman A. Nour ◽  
Waleed S. El- Tahawy ◽  
Hala A. Fouad
Keyword(s):  
Japanese Quail ◽  
Egg Production ◽  
Production Traits ◽  
Selection For

scholarly journals Effect of feathering alleles (K/k+) on laying performance, hatchability parameters and some body measurements in two lines of white plymouth rock hens

2012 ◽  
Vol 28 (3) ◽  
pp. 405-414 ◽  
Author(s):  
N. Mincheva ◽  
M. Lalev ◽  
M. Oblakova ◽  
P. Hristakieva ◽  
I. Ivanova
Keyword(s):  
Egg Production ◽  
Shape Index ◽  
Substantial Effect ◽  
Body Measurements ◽  
Production Traits ◽  
Broiler Production ◽  
Live Body Weight ◽  
Laying Performance ◽  
Lower Fertility ◽  
Selection For

The study aimed to investigate the effects of sex - linked feathering alleles on laying performance, hatchability parameters and body measurements in hens from two White Plymouth Rock lines (line L and line K) used as maternal lines in broiler production. Four groups of 18-week-old hens were formed, two of each line, with genotype K/W (slow feathering) and k+/W (rapid feathering) respectively. Groups of line L included 72 hens divided into 6 boxes with 1 rooster per 12 hens, whereas line K groups comprised 96 hens of each genotype, housed in 8 boxes with one rooster per 12 hens, totally 192 birds. The K locus alleles had no significant effect on egg production traits (p>0.05). The presence of slow feathering allele resulted in lower fertility and hatchability of set eggs in both studied lines (p<0.05). A substantial effect of feathering rate alleles was observed with respect to the egg shape index (p<0.05), eggshell thickness (p<0.001) and albumen index (p<0.05). The presence of the slow feathering allele resulted in lower live body weight of birds from line K at the age of 36 weeks (p<0.05), but in longer thighs (p<0.01) and metatarsi (p<0.001) in both lines. The selection for creation of slow feathering lines for feather sexing purposes should take into consideration the effect of the K gene on studied traits.

scholarly journals GENETIC AND PHENOTYPIC ASSOCIATIONS OF JUVENILE BODY WEIGHTS AND EGG PRODUCTION TRAITS IN TWO STRAINS OF RHODE ISLAND CHICKENS

2021 ◽  
Vol 18 ◽  
pp. 66-70
Author(s):  
O. O. ONI ◽  
B. Y. ABUBAKAR ◽  
S. O. OGUNDIPE
Keyword(s):  
Body Weight ◽  
Rhode Island ◽  
Sexual Maturity ◽  
Egg Production ◽  
Genetic Parameters ◽  
Laying Hens ◽  
Genetic Correlations ◽  
Selection Criterion ◽  
Production Traits ◽  
Body Weights

Data on body weight at 16 (WT16); 20 (WT20) weeks of age and at sexual maturity (WTSM) weight of first egg (WT1st), age at sexual maturity (ASM) and 120-d egg production (EN)  were used to estimate genetic parameters in 636 hens of two strains of Rhode Island chikens. There were significant (P.01) differences between  the two strains for all traits except for WTSM.The heritability estimates obtained ranged from 0.05 to 0.41 and 0.04 to 0.30 for strains 1 and 2 respectively. The genetic correlations obtained for the various traits were medium to high for the two strains. The phenotypic correlations were generally low but followed the same trend. The results indicate that selected stocks of the two strains would show improvements in egg production and age   at sexual maturity if juvenile body weight (WT20) is employed as a selection criterion at housing for laying hens.

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