Keywords : hatchability
The effect of different laboratorial concentrations of ammonia on interior egg quality ,chick embryo vitality and hatchability in broiler breeder eggs
Iraqi Journal of Veterinary Sciences,
2006, Volume 20, Issue 2, Pages 183-189
The effect of different concentrations of gaseous ammonia was studied. Six batches (27 eggs each of Cobb broiler breeders were used). The six batches were exposed to 0.25; 0.50; 1.01; 1.51 and 2.53 mg/lit. of ammonia, respectively, in special dessicators for 12 hours before incubation for the purpose of the complete ammonia evaporation in the disscators. In the mean time another non treated batch of eggs was kept as control .
Ammonia gaseous significantly (P<0.05) affected the interior egg quality as indicated by the PH which was gradually increased in both albumen and egg yolk, so by albumen height and yolk index depression at the different concentrations.
The early embryonic mortality was significantly affected (P<0.05) by the groups which was exposed to (0.50 and 1.01) mg/lit of gaseous ammonia. While, high significant effect (P<0.01), was shown at the concentrations of (1.51 and 2.53) mg/l of gaseous ammonia, However no significant impact of gaseous ammonia was detected in the group subjected to (0.25) mg/l comparated with the control group.
Hatchability in the treated groups was significantly reduced (P<0.05) reaching to 45% , 40% and 36% due to the exposure to ammonia at a concentrations of 0.50, 1.01 and 1.51, respectively in comparison with the control group. A further reduction (p<0.01) was noticed in the group which was received the highest percentage of the ammonia gaseous (2.53) mg / lit.
No statistical differences were observed in the group, which was exposed to 0.25 mg/lit.ammonia gaseous.
It was concluded that significant differences were observed in early embryonic mortality and hatchability, more than (0.50) mg/lit. due to eggs exposure to heigh ammonia concentrations.