Studies on the relationship between the productive and reproductive traits of some local chicken strains and the blood groups
Abstract: The main objective of the experiment was to studying the relationship between the productive and reproductive traits of some local chicken strains and the blood groups. Two local strains (Silver Montazah and Gimmizah) were used in the present study. Each strain was segregated for six B-blood groups alleles. Six homozygote and fifteen heterozygotes blood group genotypes were produced in each strain.
The studied traits were gene and genotype frequencies, fertility (estimated from total eggs), hatchability (estimated from fertile eggs), egg number (number of eggs during the first ninety days after sexual maturity, number of eggs up to 42 weeks of age, number of eggs up to 52 weeks of age and number of eggs up to 65 weeks of age), egg weight (average egg weight in grams at sexual maturity and average egg weight in grams at 40 weeks of age), body weights in grams at sexual maturity and at 40 weeks of age. Age at sexual maturity (age at first egg in days estimated for each pullet, laying house mortality (calculated as a mortaility percentage, from sexual maturity till 65 weeks of age, body measurements at sexual maturity and at maturity in centimeters (shank length, keel length and breast width), feed consumption (g ration/bird/day for adult layers), and feed conversion
(kg ration/kg eggs for pullets from 46-50 weeks of age).
Results of this work can summarized as follow:
1. The B2 and BI9 blood group alleles were the highest frequencies in Silver Montazah strain. In Gimmizah strain, the B2 and B13 blood group alleles were highest, while B1 allele was the lowest frequency in both strains.
2. Frequencies of the 21-B blood group genotypes in Silver Montazah
and Gimmizah strains showed that the homozygoites at the B-Iocus was 34.30% in Silver Montazah and 27.88% in Gimmizah. While the heterozygosity at the B locus was 65.70% in Silver Montazah and 72.12% in Gimmizah strains.
3. The average percentage of fertility in the heterozygotes genotypes, averaged was greater than that for the homozygotes genotypes in both strains, and the B1B1 homozygous genotype for homozygous had the lowest average fertility percentage.
4. The highest average fertility percentage was found in B2B2 and B19B19 genotypes in both strains. The largest highest average fertility percentage was found in heterozygous B2B13 and B2B19 genotypes
in Silver Montazah, B13B15 and B2Bl3 genotypes in Gimmizah.
5. The average percentage of hatchability in the heterozygotes genotypes was greater than that for the homozygotes genotypes in both strains. In homozygotes genotypes, the B2B2 was the largest average percentage of hatchability in both strains and B1B1 genotype was the lowest average hatchability percentage in both strains. In heterozygous, the B2B13 and B2B19 genotypes has the largest average hatchability percentage in Silver Montazah, while B2B13 and B13B19 genotypes has the largest average hatchability percentage in Gimmizah.
6. The data showed that the differences in egg number were associated with the B-blood group genotypes within all periods (first ninety days of laying 42, 52 and 65 weeks of age) of laying in two strains (Silver Monazah and Gimmizah). These differences were highly significant. In general, the percentage of egg production in the heterozygous was greater than that for the homozygous in both strains. B2B2 and BI9BI9 genotypes have the largest average of egg number percentage, but B1B1 and B5B5 genotypes were the lowest average of egg number through all periods for Silver Montazah. In heterozygous B2B13, B2B15, B2B19 and B15B19 genotypes were the highest average egg production, but B1B5 genotype was the lowest average of egg production through all period. In Gimmizah, B2B2 and B13B13 genotypes were the highest average of egg nmnbers but B1B1 and B5B5 genotypes were the lowest average of egg number through all periods. And in heterozygous B2B13, B2B19 and B13B19 genotypes were the highest average egg numbers, but B1B5 genotype was the lowest egg production through all periods.
7. The data showed that the differences in egg weight in two periods (90 days of laying and 40 weeks of age) of laying in two the strains were not significant. The egg weight within the first 90 days of laying in B2B2 and B15B15 homozygous genotypes had the largest average egg weight for two strains, B1B2 heterozygous genotype had the largest average egg weight for two strains. The egg weight within the 40 weeks of age in the B2B2 and B15BI5 homozygous genotypes had the largest average egg weight for two strains, and B1B2 and B5B15 heterozygous genotypes had the largest average egg weight for two trains.
8.For body weight at the age of sexual maturity, B1B1 and B15B15 genotypes were heavier than the other homozygous, while B2B19 genotypes was heavier than the other heterozygous genotype in Gimmizah strain and B2B19 and B13B15 heterozygous genotypes for Silver Montazah strain. While, B13B13 and B1B1 were heavier than other homozygotes genotypes and B2B15, B5B15 heterozygotes genotypes for Gilmnizah. At forty weeks, heterozygous genotypes were heavier than homozygous genotypes.
9. The B-blood group genotypes had highly significant effect on the age at sexual maturity. The homozygotes B2B2 was significantly earlier ages than other alleles in both strain. The heterozygote genotypes had higher average age at sexual maturity than homozygotegenotypes in both strains.
10. The data showed that the differences in the mortality percent were
associated with the B-blood group genotypes in both strains. In both strains the B1B1 homozygote genotypes had the largest average.
Comparison of homozygote versus heterozygote genotypes indicate that homozygote genotypes were consistently superior to some heterozygote.
11. The B-blood group had not significant effect on body measurements (Shank length, Keel length and Breast width). In general, the heterozygotes average, body measurements were greater than for the homozygous in all ages.
12. The B-blood group had no significant effect on feed consumption in both strains.
13.It could be concluded that significant relationship between the productive and reproductive traits of some local chicken strains (Silver Montazah and Gimmizah) and the blood groups. Therefore, it could suggest that blood groups alleles may considered as effective tools in the breeding methods.
Publication year 1999
Pages 106p.
Availability location مكتبة معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
Availability number 653
Organization Name
Country Egypt
Department Poultry Breeding Research Department
Author(s) from ARC
Agris Categories Animal physiology - Reproduction
AGROVOC
TERMS		 Blood composition. Carcass composition. Chickens. Homozygotes. Mortality. Production. Reproductive performance.
Publication Type PhD Thesis
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