Two experiments were carried out to determine the effect of flock
age on egg laying pattern, floor laying, egg weight, hatchability,
fertility and body weight at hatch. Eggs were collected from 32and
43 wk old Cobb 500 broiler flocks for 6 consecu
tive days hourly to
study egg laying pattern and floor laying (experiment 1). In
experiment 2, 2916 eggs from the flock at 32 ,43 and 49 wk old
were used to determine the effect of flock age on egg weight,
hatchability, fertility and body weight at hatch.
This research was carried out to study some hattching egg traits and chick weight at
day old in black type of Syrian local hens and Egyptian Fayoumi strain , and study the
differences in egg traits and chicks which come from hybrization between Syr
ian black
male and Fayoumi female.
Results showed that the average egg weight of Syrian hens was 52.33 g and of
Fayoumi hens was 46.86 g .
The fertility rate increased in hybrid egg compared with parents . It was87.94% in
hybrid compared with 84.08% in Syrian hens and 77.22% in Fayoumi strain hens.
The day old hybrid chick weight increased compared with Fayoumi chick. It was 32g
in hybrid chicks while it was 30 g in Fayoumi chicks , and it was lower compared with
black Syrian chicks (35g). Hatchability rate was 89.5% and 92.3% in Syrian local hens
and Egyptian Fayoumi hens respectively .And this rate decreased to 82.6% for the hybrid .
Chicks hatched decreased to 69.2% for hybrid compared with 72.93%for Syrian local hens
and 69.44% for Egyptian Fayoumi hens .
The mortality of hybrid chicks was 3.3% , it was lower compared with mortality of
Fayoumi chicks (6.05%) and higher compared with mortality of Syrian chicks (2.22%).
This experiment was conducted at Kharabo farm, Faculty of Agriculture,
University of Damascus. A total of 252 chicks of Japanese quail breeder females
were distributed on the first day of life into two groups, Gicks in G1 were
reared from 1-28 day
s of age under ideal required temperature according to
their age, while chicks in G2, were subjected to heat stress from 8 am to 5 pm at
42 °C from the first day of hatching until 28 day of age and to the ideal
required temperature from 5 pm until 8 am. Chicks of each group were
distributed into three subgroups, with three replicates per subgroup.
The research was carried out on two classes of hatching eggs obtained
from broiler breeder flock ( shifer starbro- Hybird ) 39 and 59 wk of age .
In each class the hatching eggs were graded into three groups according
to their weights.
The hatchi
ng eggs of each group were divided into three replicates .
Eggs of all replicates were incubated in the same incubator . At hatching
(115) chicks were taken from each replicate and fed in separate pen until 7
weeks of age . All conditions of housing, rearing and feeding
( vegetable diets ) were same for all birds of all replications.
