PHYSIOLOGICAL EFFECT OF LIGHT ON EGG PRODUCTION IN JAPANESE QUAIL
AYMAN MOHMED HASAN AHMED;
Abstract
This study was designed to investigate the effect of light regimens (LOS: 16 (short day), 12:12, 16:8 and 20:4) on body weight, reproductive performance and plasma progesterone hormone.
Birds were reared under short day length regimen (LO 8:16)
from 5wk of age till 14wk of age then reared under different light regimens: LOB: 16 (short day), 12:12, 16:8 and 20:4.
The results showed that short day (LO 8: 16) significantly
depressed body weight gain of female birds compared with other females reared under long daylength (LO 12: 12, 16: 8 and 20:4). At
12 and 13wk of age there was no significant difference in body weight
between the four light regimens. At 14wk of age females under short day length (LO 8: 16) were significantly the heaviest in their body weight.
Light regimens LO 12: 12. 16: 8 and 20: 4 caused precocious sexual development. The ages at first laid egg were 56, 56, 58 and 82 days for females reared under LO 20: 4, 16: 8, 12: 12 and 8: 16, respectively. Egg production was recorded for each female till the age of 100 days. Birds reared under light regimens of (LO 12: 12, 16: 8 and 20: 4) laid significantly more eggs till 14wk of age.
Light intensity had no effect on egg production.
Ovaries and oviducts of females raised under short day (LOB:
16). Were immature till 14wk of age. However females kept under (LO
12: 12, 16: 8 and 20: 4) had mature functional ovaries and oviducts.
Average plasma progesterone hormone levels of females kept under (LO 12: 12, 16: 8 and 20: 4) 3h before ovulation were
significantly higher than that of females kept under (LO 8: 16). It is
apparent that light regimen (LD 12:12) increased progesterone hormone level which stimulate the release of LH hormone and culminate in egg production.
Birds were reared under short day length regimen (LO 8:16)
from 5wk of age till 14wk of age then reared under different light regimens: LOB: 16 (short day), 12:12, 16:8 and 20:4.
The results showed that short day (LO 8: 16) significantly
depressed body weight gain of female birds compared with other females reared under long daylength (LO 12: 12, 16: 8 and 20:4). At
12 and 13wk of age there was no significant difference in body weight
between the four light regimens. At 14wk of age females under short day length (LO 8: 16) were significantly the heaviest in their body weight.
Light regimens LO 12: 12. 16: 8 and 20: 4 caused precocious sexual development. The ages at first laid egg were 56, 56, 58 and 82 days for females reared under LO 20: 4, 16: 8, 12: 12 and 8: 16, respectively. Egg production was recorded for each female till the age of 100 days. Birds reared under light regimens of (LO 12: 12, 16: 8 and 20: 4) laid significantly more eggs till 14wk of age.
Light intensity had no effect on egg production.
Ovaries and oviducts of females raised under short day (LOB:
16). Were immature till 14wk of age. However females kept under (LO
12: 12, 16: 8 and 20: 4) had mature functional ovaries and oviducts.
Average plasma progesterone hormone levels of females kept under (LO 12: 12, 16: 8 and 20: 4) 3h before ovulation were
significantly higher than that of females kept under (LO 8: 16). It is
apparent that light regimen (LD 12:12) increased progesterone hormone level which stimulate the release of LH hormone and culminate in egg production.
Other data
| Title | PHYSIOLOGICAL EFFECT OF LIGHT ON EGG PRODUCTION IN JAPANESE QUAIL | Other Titles | التأثير الفسيولوجى للضوء على انتاج البيض فى السمان اليابانى | Authors | AYMAN MOHMED HASAN AHMED | Keywords | .Light regimens - Egg production - Japanese quail - Progesterone Photoperiod - Body weight Reproduction | Issue Date | 1998 |
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