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Developmental increases in hypothalamic neuropeptide Y content with the embryonic age of meat- and layer-type chicks
Weidong Zhou1, Masato Aoyama, Fumiaki Yoshizawa
1United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
Insights
Central neuropeptide Y (NPY) levels in chicks were measured from embryonic day 7 to post-hatch day 1. Hypothalamic NPY increased developmentally, differing between meat and layer types, impacting early feeding behavior.
Area of Science:
- Animal Science
- Neuroendocrinology
- Developmental Biology
Background:
- Neuropeptide Y (NPY) is a key regulator of feeding behavior.
- Understanding NPY's developmental trajectory is crucial for avian growth and behavior.
- Differentiating between meat and layer-type chicks may reveal distinct physiological adaptations.
Purpose of the Study:
- To quantify central neuropeptide Y (NPY) content in meat and layer-type chicks during critical developmental stages.
- To investigate the developmental pattern of hypothalamic NPY in relation to chick type.
- To correlate NPY levels with feeding behavior in the early post-hatching period.
Main Methods:
- Measurement of central neuropeptide Y (NPY) content.
- Sampling at embryonic days 7, 14, 20, and post-hatching day 1.
- Comparison between meat-type and layer-type chicks.
Main Results:
- Central NPY was detectable as early as embryonic day 7.
- Hypothalamic NPY content showed a developmental increase in both chick types.
- The developmental pattern of NPY was similar, but the levels differed between meat and layer types.
Conclusions:
- Hypothalamic NPY plays a role in chick development and feeding behavior.
- Distinct NPY levels between meat and layer types suggest type-specific regulatory mechanisms.
- These findings provide insights into the neuroendocrine control of feeding behavior during early avian development.
Abstract:
We determined central neuropeptide Y (NPY) content of meat- and layer-type chicks at embryonic days 7, 14, 20, and at post-hatching day 1. The central NPY was detectable at day 7; hypothalamic NPY content developmentally increased with a similar pattern but a different level between both types of chicks. These results were discussed with respect to feeding behavior early period after hatching.
