ABSTRACT
Two experiments were carried out to study the effect of breeder
age on incubation parameters (hatchability, eggshell thickness, egg
surface temperature and chick weight). In Exp. 1, fertile eggs (30- and
60-wk-old breeders) were incubated at three different temperatures
(36.8, 37.8 and 38.8 oC). Eggshell surface temperature was measured
by attaching a thermocouple to the shell and data were collected in
a datalogger every ten minutes. This study was conducted according
to a 3 x 2 factorial design (three temperatures and two breeder ages).
Data revealed that eggshell surface temperature changed according
to incubation temperature, with the main increase occurring between
10 and 13 days of incubation, and that the maximum increase in
eggshell surface temperature was not higher than +0.6 oC, irrespective
of incubator temperature. The incubator temperature affected total
incubation period and hatchability (%) at 38.8 oC, independent of
breeder age. Heavier eggs resulted in heavier chicks, irrespective of
incubator temperature. In Exp 2, the eggs (30- and 60-wk-old breeders)
were incubated at 37.8 oC and eggs characteristics (weight, specific
gravity, total hatchability and chicks weight) were evaluated accordingto a randomized experimental design. The data showed that breeder
age affected eggshell thickness and chick weight (heavier eggs resulted
in heavier chicks), but not specific gravity, eggshell surface temperature
or hatchability. The findings of this study revealed that hatchability can
be influenced by incubation temperature, but not by the breeder age.
Breeder age can affect eggshell thickness, egg weight and eggshell
surface temperature, but not specific gravity.
ABSTRACTTwo experiments were carried out to study the effect of breederage on incubation parameters (hatchability, eggshell thickness, eggsurface temperature and chick weight). In Exp. 1, fertile eggs (30- and60-wk-old breeders) were incubated at three different temperatures(36.8, 37.8 and 38.8 oC). Eggshell surface temperature was measuredby attaching a thermocouple to the shell and data were collected ina datalogger every ten minutes. This study was conducted accordingto a 3 x 2 factorial design (three temperatures and two breeder ages).Data revealed that eggshell surface temperature changed accordingto incubation temperature, with the main increase occurring between10 and 13 days of incubation, and that the maximum increase ineggshell surface temperature was not higher than +0.6 oC, irrespectiveof incubator temperature. The incubator temperature affected totalincubation period and hatchability (%) at 38.8 oC, independent ofbreeder age. Heavier eggs resulted in heavier chicks, irrespective ofincubator temperature. In Exp 2, the eggs (30- and 60-wk-old breeders)were incubated at 37.8 oC and eggs characteristics (weight, specificgravity, total hatchability and chicks weight) were evaluated accordingto a randomized experimental design. The data showed that breederage affected eggshell thickness and chick weight (heavier eggs resultedin heavier chicks), but not specific gravity, eggshell surface temperatureor hatchability. The findings of this study revealed that hatchability canbe influenced by incubation temperature, but not by the breeder age.Breeder age can affect eggshell thickness, egg weight and eggshellsurface temperature, but not specific gravity.
การแปล กรุณารอสักครู่..
