Mahmoud,, R., Aly, W., Samak, H. (2008). EFFECT OF THYROXIN AND ASCORBIC ACID ON HATCHABILITY AND GROWTH PERFORMANCE OF CHICKENS A LOCAL STRAIN.. Journal of Animal and Poultry Production, 33(1), 167-180. doi: 10.21608/jappmu.2008.217716
R. M. Mahmoud,; W. Z. Aly; H. R. Samak. "EFFECT OF THYROXIN AND ASCORBIC ACID ON HATCHABILITY AND GROWTH PERFORMANCE OF CHICKENS A LOCAL STRAIN.". Journal of Animal and Poultry Production, 33, 1, 2008, 167-180. doi: 10.21608/jappmu.2008.217716
Mahmoud,, R., Aly, W., Samak, H. (2008). 'EFFECT OF THYROXIN AND ASCORBIC ACID ON HATCHABILITY AND GROWTH PERFORMANCE OF CHICKENS A LOCAL STRAIN.', Journal of Animal and Poultry Production, 33(1), pp. 167-180. doi: 10.21608/jappmu.2008.217716
Mahmoud,, R., Aly, W., Samak, H. EFFECT OF THYROXIN AND ASCORBIC ACID ON HATCHABILITY AND GROWTH PERFORMANCE OF CHICKENS A LOCAL STRAIN.. Journal of Animal and Poultry Production, 2008; 33(1): 167-180. doi: 10.21608/jappmu.2008.217716
EFFECT OF THYROXIN AND ASCORBIC ACID ON HATCHABILITY AND GROWTH PERFORMANCE OF CHICKENS A LOCAL STRAIN.
Animal Production Res. Institute, Agric. Res. Center, Dokki, Giza, Egypt
Abstract
The experiment was conducted to study the effects of injecting or dipping Montazah eggs with different levels of ascorbic acid (AA) and Eltroxin (EL) on hatchability characteristics including hatchability rate, embryonic mortality and egg weight loss during incubation as well as on productive performance of chicks produced from different treatments, including body weight, weight gain, growth rate and feed conversion at 0-4, 4-8, 8-12 and 0-12 wk of age. Dipping recorded higher (P<0.05) values for all traits studied in comparing with injection technique. Treatment with AA had the highest (P<0.05) values for all traits studied compared with EL or control (distilled water). Dipping eggs with AA at a level of 0.5% had (P<0.05) the highest hatchability percentage, the lowest embryonic mortality. Chicks hatched of eggs dipped in AA at a level of 0.5% showed the highest (P<0.05) average body weight, weight gain and viability rate as well as the best feed conversion at hatch and at the end of the experimental period. Chicks of eggs injected with AA at a level of 1 mg/egg had the highest (P<0.05) growth rate at the end of the experimental period. From the economic point of view, the current study may conclude that dipping eggs in AA solution at a level of 0.5% had beneficial effects on hatchability characteristics and productivity of hatched chicks gained more in their body weight and more economic.
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