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Genetic studies for growth traits in Inshas strain
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Abstract: The present study was carried out during two successive breeding seasons, 2003 and 2004. The investigation aimed to improve the genetic potentialities of economic traits in developed Inshas chickens strain through selection. Random bred population of Inshas chickens was the base population of the program of selection that had been started in the experimental station of Sakha Poultry Farm, Kafr EI-Sheikh, Animal Production Research Institute, Ministry of Agriculture. The study involved 2400 pedigreed chicks obtained from the mating 72 sires with 500 dams through two successive breeding seasons. The chicks in each generation represented two lines, selected line for high body weight and control line. Body weight, body weight gain, body measurements and feed conversion for the two lines over generations were estimated.
The results showed that body weight at different ages highly significantly improved in selected line more than control line. There were significant differences between generations, lines and sexes in body weight and body weight gain at different ages. Body measurements (Shank length, Keel length and Circumference) at 4,8 and 12 weeks of age were significant (p<0.05) between generations, lines and sexes. Males selected and unselected were better than females within and between lines.
Body weight gain at different ages was significantly differences between generation, lines and sexes. Male chicken had higher daily weight gain than females at all periods. Significant differences were found between selected and control lines as well as among generations for feed conversion during the different ages. Significant differences between lines, sexes and generation for body measurements at different ages were recorded. Heritability based on sire plus dam were moderate to high for growth traits. Heritability estimates were high for body measurements and feed conversion, 0.58±0.12, 0.21 ±0.09, 0.15±0.16, 0.20±0.14 for body weight at hatch, 4, 8 and 12 week of age, 0.22±0.01, 0.24 ±o.06 and 0.35±0.04 for feed conversion at 4,8 and 12 weeks of age. Phenotypic correlations among body weight and body measurements were positive. But among body weight or body measurement and feed conversion were negative.
Generally, it is advised to continue the direct selection program in Inshas chicken for body weight at different ages to achieve more improvement in other growth parameters.
Keywords: local strain, growth parameters, heritability, phenotypic correlation.
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| Publication year |
2006
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| Pages |
1301-1312
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| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى- الجيزة
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| Availability number |
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| Organization Name |
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| City |
المنصورة
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| serial title |
Journal of Agricultural Science Mansoura University
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| ISSN |
1110-0346
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| Author(s) from ARC |
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| Agris Categories |
Animal husbandry
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AGROVOC
TERMS |
Heritability.
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| Proposed Agrovoc |
phenotypic correlation;growth parameters;local strain;economic traits;genetic potentialities;Shank length;Keel length;Keel length;Circumference;
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| Publication Type |
Journal
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