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Genetical and nutritional studies on poultry
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Abstract: Two local strains (EI-Salam and Banarah) were used in the present study. The aim of this investigation was trying to improve the body weight of the crossbred, which produced from the two strains by the selection in the pure parents stocks on the basis of the crossbred and also the pure line information. The male parents in both strains were selected for high body weight of their progeny in the crossbred at 12 weeks of age, while the dams selected for better feed efficiency (gm feed/gm egg) of their parent. The control, for both strains were kept under the same environmental conditions.
Results obtained could be summarized as follows:
1.Parent stocks:
1.The means of eight-week body weight for El-Salam selected (SS), Bandarah selected (BS), El-Salam control(SC) and Bandarah control(BC) were 790, 801, 791 and 800 gm in the base population, while in the first generation were 854, 846,747 and 802 gm for the same lines, respectively.
2. In the same period, feed efficiency was improved with about 19% for the both strains.
3. No significant differences were found in body measurements and body conformations at 6-weeks or 8-weeks of age within the two generations and for both strains.
4. El-Salam selected consumed 5 gm feed/day in the first generation less than in the base population.
5. About one gram difference was calculated in egg weight between base and first generation for the two strains.
6. Highly significant differences were found between the four lines in the first generation in egg production at 10 months (4th production period).
The of age egg difference was 15\ between SS and SC, and 10% between BS and BC.
7. As a result for the above point egg mass production was 8 gm/day in both selected lines (SS and BS) it was more than control lines (SC and BC) during the 4th egg production period.
8. During the same period feed efficiency for egg production at the same period had an average of 3.4 for selected lines and about 4.5 for control lines.
11. crossbreeds:
1. Body weight means at 12 weeks of age in the base population for the crossbreds (SS x BS, SC x BC, BS x SS and BC x SC) were 1280, 1270, 1278 and 1265 gram and 1460, 1200, 1395 and 1220 gram for the same crossbreds after one generation of selection, respectively.
2. Insignificant differences were found between genetic groups in growth rate neither within generation, nor between generations.
3. Data of body measurements and body conformation, at 12 weeks of age revealed that the differences among genetic groups were significant in body depth and breast angle.
4. The dressing percent in the base population of the crossbred S5 x BS was 76.2% while it was 77.5 after one generation of selection.
5. After correction the main effects in the differences in dressing percent was about 3.6% between the two generation for. the same genetic group.
111. Genetic parameters:
1.The average of heritability estimates of body weight at the different ages
ranged from 0.10 to 0.58 and from 0.22 to 0.80 on the basis of sire and combined contributions, respectively.
2. In both generations, the heritability estimates of feed efficiency during the first 8 weeks of age were 0.34 and 0.65 on the basis of sire and sire plus dam contributions, respectively.
3. Heritability coefficients for body measurements and conformation at 6 weeks of age ranged from 0.32 to 0.88 and at 8 weeks of age from 0.5 to 0.86.
4. From the data of the base population, heritability values were estimated for feed consumption, egg number, egg weight, egg production, egg mass and feed efficiency of egg production, which were: 0.65, 0.82, 0.97, 0.80, 0.78, and 0.73 and 0.66, 0.67,1.00, 0.65, 0.70 and 0.66 for the adjusted and unadjusted data, respectively.
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| Publication year |
1992
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| Pages |
140p.
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| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
407
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| Organization Name |
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| Country |
Egypt
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| Department |
Poultry Breeding Research Department
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| Author(s) from ARC |
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| Agris Categories |
Animal feedingAnimal husbandry
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AGROVOC
TERMS |
Body weight.
Crossbreds.
Dams.
Fathers.
Feed conversion efficiency.
Heritability.
Parents.
Poultry.
Selection.
Stocks.
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| Publication Type |
Master Thesis
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