الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 130 |  |  |
| | | from | 130 | | |
Abstract
The present study was carried out at the Poultry Research Center, Faculty of
Agriculture, Alexandria University; during the period from August to December 2021. Two experiments were undertaken. The first experiment was conducted to determine the ideal
level of both Nano selenium (NSe) and vitamin B3 (Nicotinamide) in-ovo injection into the amnion cavity of Arbor Acers broiler breeder eggs at d18 of incubation, and study their
effects on hatchability and some newly hatched broiler chicks’ traits. The experiment extended to 7 days of age. With the same broiler breeder strain, the second experiment was directed to study the effects of the ideal levels resulted from the previous pilot experiment, in addition to their mixture (NSe plus B3) on different traits at hatch, productive performance, carcass characteristics, some hematological and biochemical trait, natural antibodies and antioxidant indicator. Moreover, the improvements in productive and carcass
traits were estimated. The experiment extended to 35 days of age. The following points summarize the most important results and conclusions:
First: The pilot experiment
1. The results showed insignificant differences among all studied groups in regard to egg weight, chick weight and chick yield.
2. The results showed insignificant differences among all studied groups in respect of fertility percentages (%); while the hatchability of set eggs (HOS) of in-ovo injected 350 mM B3/egg
group has significantly highest value (97.78%) compared to all other studied groups. On the other hand, the hatchability based on fertile eggs (HOF) values were significantly higher for control, saline, 300 mM B3, and 350 mM B3 groups (97.73, 97.78, 99.19, and 97.78%, respectively) compared to all other studied groups.
3. The results showed that the 7-day chick weight of in-ovo injected 250 mM B3/egg group had a significantly highest value (193.26g) compared to all other studied groups. Also, chick weight
gain at 7 days of the age of in-ovo injected 250 and 350 mM B3/egg groups had significantly higher values (149.21 and 145.75g, respectively) compared to all other studied groups. The
results showed that the in-ovo injected 250 mM B3/egg group has the higher feed consumption during 0-7 days of age (155.89g) with insignificant differences with the corresponding values of
all studied groups. On the other hand, the results showed insignificant differences among all
studied groups in respect of feed conversion ratio during 0-7 days of age.