APPLICATION OF IMMUNOGLOBULIN G (IGG) AS EARLY GENETIC MARKER TO IMPROVE SOME EGG PRODUCTION TRAITS IN CHICKEN

One of the main roles in poultry resistance to infections caused by Salmonella is attributed to host immunity and intestinal microbiota. We conducted an experiment that involved challenging Lohmann White laying hens with Salmonella Enteritidis (SE), feeding them a diet supplemented with an EOs-based phytobiotic Intebio®. At 1 and 7 days post-inoculation, the expression profiles of eight genes related to immunity, transport of nutrients in the intestine, and metabolism were examined. Cecal microbiome composition and blood biochemical/immunological indices were also explored and egg production traits recorded. As a result, the SE challenge of laying hens and Intebio® administration had either a suppressive or activating effect on the expression level of the studied genes (e.g., IL6 and BPIFB3), the latter echoing mammalian/human tissue-specific expression. There were also effects of the pathogen challenge and phytobiotic intake on the cecal microbiome profiles and blood biochemical/immunological parameters, including those reflecting the activity of the birds’ immune systems (e.g., serum bactericidal activity, β-lysine content, and immunoglobulin levels). Significant differences between control and experimental subgroups in egg performance traits (i.e., egg weight/number/mass) were also found. The phytobiotic administration suggested a positive effect on the welfare and productivity of poultry.

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USING IMMUNOGLOBULIN G AS EARLY GENETIC MARKER TO IMPROVE SOME ECONOMIC TRAITS IN CHICKENS

Menoufia Journal of Animal Poultry and Fish Production ◽

10.21608/mjapfp.2021.212690 ◽

2021 ◽

Vol 5 (10) ◽

pp. 125-126

Author(s):

G. M. Gebriel ◽

A. A. El-Fiky ◽

Eman M. Abou-Elewa

Keyword(s):

Genetic Marker ◽

Immunoglobulin G ◽

Economic Traits

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Polymorphism of the prolactin gene and its association with egg production traits in native Chinese ducks

South African Journal of Animal Science ◽

10.4314/sajas.v41i1.66044 ◽

2011 ◽

Vol 41 (1) ◽

Cited By ~ 10

Author(s):

C Wang ◽

Z Liang ◽

W Yu ◽

...

Keyword(s):

Egg Production ◽

Production Traits ◽

Prolactin Gene

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Genetic effect of the prolactin receptor gene on egg production traits in chickens

Genetics and Molecular Research ◽

10.4238/2012.october.2.1 ◽

2012 ◽

Vol 11 (4) ◽

pp. 4307-4315 ◽

Cited By ~ 14

Author(s):

L. Zhang ◽

D.Y. Li ◽

Y.P. Liu ◽

Y. Wang ◽

X.L. Zhao ◽

...

Keyword(s):

Egg Production ◽

Receptor Gene ◽

Prolactin Receptor ◽

Genetic Effect ◽

Production Traits ◽

Prolactin Receptor Gene

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DOMINANCE AND EPISTASIS IN HETEROSIS OF WHITE LEGHORN STRAIN CROSSES

Canadian Journal of Animal Science ◽

10.4141/cjas87-070 ◽

1987 ◽

Vol 67 (3) ◽

pp. 663-680 ◽

Cited By ~ 20

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

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

European Journal of Agriculture and Food Sciences ◽

10.24018/ejfood.2021.3.2.254 ◽

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.

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Heterosis effect in hybrid laying hens

Biotechnology in Animal Husbandry ◽

10.2298/bah1402303h ◽

2014 ◽

Vol 30 (2) ◽

pp. 303-311 ◽

Cited By ~ 2

Author(s):

P. Hristakieva ◽

M. Oblakova ◽

M. Lalev ◽

N. Mincheva

Keyword(s):

Sexual Maturity ◽

Egg Production ◽

Live Weight ◽

Egg Laying ◽

Production Traits ◽

Egg Weight ◽

Group V ◽

Paternal Line ◽

Group I ◽

Heterosis Effect

The new original egg laying lines T, P and N selected at the Institute of Agriculture - Stara Zagora were used. Hybrid ?? ? ??, ?? ? ?? crosses were obtained and used for paternal line. Thereafter, the following breeding schedule of paternal and maternal lines was applied: Group I - (?????)? ?N?; group ?? - (?????)? ?N?; group ??? - ???N?; and group ?V - ???N?. The production traits of original and hybrid birds were recorded: live weight at the age of 8 and 18 weeks, age of sexual maturity in days, 150 days egg production, average egg weight - at 2-week intervals until end of lay; livability, heterosis effect. The live weights of hybrids at 8 and 18 weeks of age were statistically significantly lower compared to original lines. The values of heterosis for this parameter were negative for all four hybrid combinations. The earliest beginning of egg lay occurred in (?????) ? ?N? (162.08 days of age) and ???N? (163.11 days of age). The relative (%) heterosis for age of sexual maturity of studied hybrid combinations had moderate to low negative values. Average egg weights of hybrids were higher and the values of heterosis - positive for all four groups varying from 0.97% to 1.63%. The average 150 days egg production was lower in purebred lines compared to hybrids. The highest average 150 days egg production was determined in ???N? hybrids - 142 eggs. The heterosis effect for egg production in hybrids was significant.

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