Comparative embryonic development in chickens with different patterns of postnatal growth.
Comparative embryonic development in chickens with different patterns of postnatal growth.
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发表时间：
1995
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通讯作者：
N. Clum;D. Mcclearn;G. Barbato
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作者：
N. Clum;D. Mcclearn;G. Barbato
我们比较了胚胎发育的两个线的鸡，表现出不同的模式，出生后的增长。经典的分期技术和骨，软骨，羽毛和肠的形态测量被用来测试的假设，即出生后的生长差异将反映在胚胎组织分区的模式。在孵化的第二个季度，出生后生长较高的品系明显提前（即，总体上发育较差）。来自具有较高出生后生长的品系的胚胎表现出较少（即，分配远离）、骨生长（喙长度、长骨骨化）、羽毛生长（羽状乳头的数量、初级的长度）和眼睛发育（透镜巩膜的数量）。两个品系之间的肠道发育没有差异。我们的研究结果表明，不同的出生后生长模式与组织类型之间的胚胎重新分配模式的变化，即使在孵化时的总体形态差异并不明显。我们认为，这些发展的差异代表了胚胎分配到肌肉等组织的增生性生长的时期，作为增加孵化后生长潜力的一种手段。
We compared embryonic development of two lines of chickens that exhibit different patterns of postnatal growth. Classical staging techniques and morphological measurements of bone, cartilage, feather and intestines were used to test the hypothesis that differences in postnatal growth would be reflected in patterns of embryonic tissue partitioning. During the second quarter of incubation, the line with higher postnatal growth staged significantly earlier (i.e., was less developed overall) than the line with lower postnatal growth. Embryos from the line with higher postnatal growth exhibited less (i.e., allocated away from), bone growth (beak length, ossification of long bones), feather growth (number of feather papillae, length of primary), and eye development (number of lens sclera). There were no differences in gut development between the two lines. Our results show that different postnatal growth patterns are associated with changes in the pattern of embryonic reallocation between tissue types, even when gross morphological differences are not evident at hatching. We suggest that these differences in development represent periods when the embryo is allocating to hyperplastic growth of tissues such as muscle, as a means of increasing posthatching growth potential.