A Model for Marker-Assisted Selection for Fast Growth in Native Egyptian Chickens

Citation:
Helal, M. M. A. E. - H., E. A. El-Gendy, and A. Mostageer, A Model for Marker-Assisted Selection for Fast Growth in Native Egyptian Chickens, , Egypt, Cairo University, 2013.

Thesis Type:

PhD Thesis

Abstract:

The objective of this study was to use the data of growth patterns of local
chickens accompanied with their molecular data to develop a strategy for markerassisted
selection for growth. Four lines were used and have been derived from a
naturally heat resistant local breed in Egypt. They were a homozygous normallyfeathered
selected line (CE1), homozygous naked-neck selected line (CE3) and
their corresponding control lines (CE2 and CE4). Lines CE1 and CE3 have been
selected for high 6-wk BW for five generations. Three generations were obtained
for this study. Lines CE1 and CE3 were significantly heavier at 6 weeks of age
than their corresponding control lines CE2 and CE4 by 24.15 and 27.07% in the
base generation and by 51.4 and 34.5% in the second selected generation. The
differences reached to 57.1 and 62.8% at 18 weeks of age in the base generation
and 49.3 and 28.7% in the second selected generation. Line CE1 was significantly
heavier than line CE3 throughout the growing period. The total number of alleles
per locus averaged 7.78 alleles. Polymorphism percentage averaged 50.1 and
55.1% in lines CE1 and CE3 versus 38.6 and 49.6% in lines CE2 and CE4.
Percentage of unique alleles averaged 4.3 and 4.6% in lines CE1 and CE3. Many
polymorphic allelic bands were differed in their frequencies between high and low
performed families in lines CE1 and CE3. A total of 34 polymorphic alleles in 19
loci were flown over generations and the flow trends were different in different
lines and families within lines. Principle component analysis was applied to the
data of both lines and two main components were found and three canonical
correlations were obtained. Four and five bands were persistently concomitant
with the highly performed families in lines CE1 and CE3, respectively. These
bands would have brought 6-wk BW into higher levels of performance by 25.1
and 16.6% in the second generation if they would have been considered in the
selection for 6-wk BW.

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