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Effect of early acclimatization on performance of some local breeds of chickens under hot climate conditions
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Abstract: The present study was carried out at Poultry Breeding Research Station (Sids , Beni - suif ) Animal Production Research Institute, Agricultural Research Center, to investigate the effect of high brooding temperature ( 38° c) during the first 3 days post hatching on the performance of three local strains of chickens as a method of acclimation to heat stress. Two hundred one- day old chicks from each of Dokki 4 (Dk4), Bandara (Bn) and Dandarawi (Dn) were used in this study.
Results obtained could be summarized as follows:
- The effect of treatment on chicks during the first 3 days of age after hatch was negative on body weigh at 13 , 20 and 25 weeks of age from all strains.
- The treated chickens were more efficient in conversion of feed to eggs, it was 3.26, 3.17 and 3.53 gm feed / gm eggs while, for untreated chickens it was 4.12, 4.39 and 5.00 gm feed I gm eggs, from Dn , Dk4 and Bn strains respectively.
- Treated chicks laid their first egg earlier than untreated groups (p<0.05). Ageat first egg treated birds was 169, 181 and 179 days compared with untreated groups 185, 196 and 211 days in Dn, Dk4 and Bn respectively.
- There were insignificant differences in weight of first egg and average egg weigh during the first 90 days of production due to treated and untreated within each strain.
- The treated chickens had significant higher egg production 43, 43, and 40 egg / hen / 90 days compared with untreated chickens 35, 32 and 33 egg / hen / 90 days in Bn, Dk4 and Dn strains respectively.
- The treated chickens had significant (p<0.05) higher egg mass compared with untreated chickens.
- Eggs produced from Dn treated strain had significant higher fertility percentage (93.88%) than untreated (76.84)%. While, Dk 4 and Bn treated strains had significant (p < 0.05) lower fertility 86.3 % and 63.71 % than the untreated strains 95.37 % and 82.72 % respectively.
-The effect of early heat acclimation on hatchability percentages were differ according to strain also, it not significant between treated and untreated Dn strain while, treated Dk4 strain had higher (p<0.05) hatchability percentage than untreated but, opposite trend was noted in Bn strain
- Treated chickens produced eggs with significant (p < 0.05) higher shell weight % than untreated Bn strain. While, differences between Dk 4 , and Dn strains ( treated and I or untreated) in egg shell weight % were not significant.
- There was no significant effect from treatments on both albumin weight % and yolk weight % for Bandara eggs, but the treatement caused increased in albumin weight % and significantly decreased in yolk weight % in Dn and Dk 4 strains compared to untreated groups.
- Dn and Dk4 treated chicks produced eggs with high yolk index compared with untreated groups, while the treatment had no effect on yolk index of Bn eggs - The heat treated group increased haugh unit in eggs for Dn and Bn strains while, it was decreased haugh unit in eggs to Dk 4 strain, also, it was insignificant differences in albumin index between different treatment from all strains - Rectal temperature (R.T) of the treated chicks of the three strains was higher at 3 days age, but at 20 weeks age it was high for Dn and lower for Dk and Bn compared with untreated chicks. Also, the early acclimation increased RT in Dn and Dk strains at 25 weeks of age and decreased RT in Bn strain, while; it decreased RT in Dn and Bn strains at 30 weeks of age.
- The early heat acclimation decreased significantly respiration rate (RR) in Dn strain in all ages, but in Dk4 strain at 13, 25 and 30 weeks of age, while in Bn strain at 20, 25 and 30 weeks of age
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| Publication year |
2005
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| Pages |
407-420
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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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| serial title |
Egyptian Journal Applied Science
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| ISSN |
1110-1571
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Nutrition
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AGROVOC
TERMS |
Adaptation.
Chickens.
Egg hatchability.
Egg production.
Fertility.
Heat stress.
Performance testing.
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| Proposed Agrovoc |
weight of first egg;egg weigh;
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| Publication Type |
Journal
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