An experiment was conducted to assess
how hatching performance is affected by breeder age
and egg holding environment during short-term storage.
Response variables analyzed were egg weight loss up to
18 d of incubation, viability (hatchability of fertile eggs),
embryonic mortality, hatching time, and weight of male
and female chicks, at hatching and at the end of
incubation. The trials involved a total of 2,250 hatching
eggs from each of two commercial broiler breeder flocks
of the same strain (Avian) but of different ages (32 to 34
and 48 to 50 wk). Eggs were stored for 0, 1, or 2 d in the
egg storage room or in the setter room. The hatching
times of the chicks were recorded at 4-h intervals during
the period from 478 to 494 h postincubation, and at 514
h, when incubation was terminated and all chicks were
removed from the hatcher. In eggs from younger hens,
viability was not influenced by preincubation storage; in
older hens, viability of eggs not submitted to storage
was higher (P < 0.05) by 3 to 6 percentage points than
that of stored eggs. Hatching times were not affected by
age of the hen, whereas male chicks tended to hatch, on
average, about 3 h later than females. Chick weights at
hatching and at removal from the hatcher were similar
for both sexes, but females experienced a higher (P <
0.05) weight loss in that interval. Eggs incubated on the
day of lay tended to hatch, on average, later than stored
eggs (especially when compared to eggs submitted to 1
d storage), and produced heavier chicks.
An experiment was conducted to assesshow hatching performance is affected by breeder ageand egg holding environment during short-term storage.Response variables analyzed were egg weight loss up to18 d of incubation, viability (hatchability of fertile eggs),embryonic mortality, hatching time, and weight of maleand female chicks, at hatching and at the end ofincubation. The trials involved a total of 2,250 hatchingeggs from each of two commercial broiler breeder flocksof the same strain (Avian) but of different ages (32 to 34and 48 to 50 wk). Eggs were stored for 0, 1, or 2 d in theegg storage room or in the setter room. The hatchingtimes of the chicks were recorded at 4-h intervals duringthe period from 478 to 494 h postincubation, and at 514h, when incubation was terminated and all chicks wereremoved from the hatcher. In eggs from younger hens,viability was not influenced by preincubation storage; inolder hens, viability of eggs not submitted to storagewas higher (P < 0.05) by 3 to 6 percentage points thanthat of stored eggs. Hatching times were not affected byage of the hen, whereas male chicks tended to hatch, onaverage, about 3 h later than females. Chick weights athatching and at removal from the hatcher were similarfor both sexes, but females experienced a higher (P <0.05) weight loss in that interval. Eggs incubated on theday of lay tended to hatch, on average, later than storedไข่ (โดยเฉพาะอย่างยิ่งเมื่อเทียบกับไข่ที่ส่งไป 1d เก็บ), และผลิตลูกไก่หนัก
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