| dc.contributor |
Savage, Thomas F. |
|
| dc.contributor |
Hermes, James |
|
| dc.contributor |
Mok, David |
|
| dc.contributor |
Robinson, W. Douglas |
|
| dc.date |
2007-02-13T19:24:12Z |
|
| dc.date |
2007-02-13T19:24:12Z |
|
| dc.date |
2007-01-17 |
|
| dc.date |
2007-02-13T19:24:12Z |
|
| dc.date.accessioned |
2013-10-16T07:44:19Z |
|
| dc.date.available |
2013-10-16T07:44:19Z |
|
| dc.date.issued |
2013-10-16 |
|
| dc.identifier |
http://hdl.handle.net/1957/3952 |
|
| dc.identifier.uri |
http://koha.mediu.edu.my:8181/xmlui/handle/1957/3952 |
|
| dc.description |
Graduation date: 2007 |
|
| dc.description |
Hatchability of the fertilized avian egg is impacted by factors which can be
categorized as being either genetic or environmental in nature. An elevated
incubation temperature, > 100 F reduces development time (time, days to hatch),
but increases embryonic mortality and lowers the numbers of fertile eggs that will
hatch.
Embryonic failures, which affect hatchability are expressed at varying times in
development. One such embryonic period is associated with down formation. In
the mid-shaft portion of the developing feather plumule a condition referred to as
clubbed down has been described. This condition was recognized in 1937, but the
precise origins of this disorder remain unclear. Genetic studies conducted in this
thesis have revealed that clubbed down in Coturnix quail is the expression of an
autosomal recessive gene in the homozygous state whose expression is modulated
by incubation at a temperature of 102 F. Results of selected matings of carriers for
clubbed down suggest that the condition is expressed in embryos that are
homozygous for the recessive gene. The responsible gene appears to be
temperature sensitive in its expression. |
|
| dc.language |
en_US |
|
| dc.subject |
Clubbed Down |
|
| dc.subject |
Elevated Incubation Temperature |
|
| dc.subject |
Coturnix Embryos |
|
| dc.title |
The influence of an elevated incubation temperature on the expression of clubbed down in Coturnix embryos |
|
| dc.type |
Thesis |
|