Genetic and nongenetic variations in economic traits of two Egyptian strains subjected to vaccination against New castle disease virus
Abstract: The objective of this study was to evaluate the effect of vaccination, against New Castle Disease Virus (NCDV), of two Egyptian chicken strains (El-Mandarah and El-Salam) on immune response, productive and reproductive traits as well as their genetic parameter estimates. The results of this study showed that:
Vaccination increased (P<0.05) the antibody titer against NCDV in EI-Mandarah chicks at 2,4, 6 and 8 weeks as well as 180 days of age (58.36, 123.35, 53.21, and 57.03, and 154.75, respectively) compared to EI-Salam strain.
Vaccination induced stress (P<0.05) on EI-Salam chicks which had the lightest weight (107.12), while the non vaccinated ones were the heaviest at 2 (112.33) , and 4 to 12 weeks of age. The same trend was observed for body weight gain at 6-8 weeks of age.
EI-Salam chicks of both treatments consumed more feed than EI-Mandarah ones from 4 to 8 weeks of age. Male body weights super passed those of females by 5-18.6% in EI-Mandarah strain and 10-22% in EI-Salam ones. Marked strain effect (El-Mandarah hens) was noticed for egg number and percentages at first 90 days, 42 and 65 weeks of age (8.4, 9, and 2.5). Egg mass of EI-Salam Strain was significantly improved at 65 weeks in vaccinated hens (10089.9 ± 176) than non vaccinated ones (9284.9 ± 211.7 gm).
High paternal half sib heritability estimates was detected for age and body weight at sexual maturity (SM) (0.4770.794), antibody titers at 180 days (0.678 ± 0.26) 42 and 65 weeks of age egg number, weight and mass (0.313-0.451), and fertility % (42.2±t0.24). Moreover very high positive genetic correlation (rg) was shown for body weight at 65 weeks and the preceding weights as well as hatchability (>0.953); fertility % and egg weights (42 & 65 weeks), egg mass (90 days) , egg number, ( 65 weeks) (0.821 0.906) , ASM , and egg weight & mass (65 weeks) (0.903 - 0.988);
Egg number at first 90 days of laying and antibody titers, ASM, egg number and weights at 65 weeks (0.834-0.973).
Antibody titers against NCD showed high positive genetic correlation (rg) with egg number and weight (65 weeks), ASM, egg number and mass (42 weeks) fertility and hatchability % (0.715 - 0.784). In addition, high to medium positive phenotypic correlation was estimated between body weights at different ages of egg production (0.439-0.818), egg number at 90 days and 42 & 65 weeks as well as fertility % (0.449 - 0.646).
It could be concluded that vaccination against NCDV improved immune response in EI-Mandarah strain than EI-Salam, and showed positive correlation with some economic productive and reproductive traits that could be used for further line breeding.
Keywords: Egyptian chicken strains, economic & genetic traits, New-Castle Disease
Publication year 2005
Availability location معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى - الجيزة
Availability number
Organization Name
City الاسكندرية
serial title Alexandria Journal Veterinary Science
Author(s) from ARC
External authors (outside ARC)
    محمد عبد البارى مندور طب بيطرى - جامعة الاسكندرية
Agris Categories Animal diseasesAnimal husbandry
AGROVOC
TERMS		 Economic situation. Genetic variation. Vaccination.
Proposed Agrovoc New castle disease;Egyptian chicken strains;
Publication Type Journal
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