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Respiratory capacity of developing chick red and white skeletal muscle
Insights
This study measured oxygen consumption and enzyme activity in chick embryo muscles. Results indicate pre-natal differentiation of skeletal muscle, with differences emerging in enzyme activity between leg and breast muscles.
Area of Science:
- Biochemistry
- Developmental Biology
- Avian Physiology
Background:
- Skeletal muscle development in avian species is crucial for locomotion and metabolic function.
- Understanding embryonic muscle differentiation provides insights into physiological adaptations.
Purpose of the Study:
- To investigate the developmental changes in oxygen consumption and key respiratory enzyme activity in chick embryo leg and breast muscles.
- To determine if pre-natal differentiation leads to functional differences between these muscle types.
Main Methods:
- Measurement of oxygen consumption rates in muscle tissue samples.
- Assay of cytochrome oxidase and succinoxidase enzyme activities.
- Analysis of samples from chick embryos aged 11 to 19 days.
Main Results:
- Oxygen consumption and enzyme activities increased significantly in both leg and breast muscles during embryonic development.
- Significant differences in cytochrome and succinoxidase activity were observed between leg and breast muscles in later embryonic stages.
- Oxygen uptake did not show significant differences between the muscle types during late development.
Conclusions:
- The findings suggest a partial pre-natal differentiation of skeletal muscle in domestic fowl.
- Functional and biochemical distinctions between leg and breast muscles emerge before hatching.
Abstract:
Oxygen consumption, cytochrome oxidase and succinoxidase activity was measured in samples of leg and breast muscle from chick embryos ranging in age from 11 to 19 days. Respiratory parameters increased significantly in both muscle groups during embryonic life. By the later stages of incubation, leg and breast muscles differed significantly in cytochrome and succinoxidase activity. Oxygen uptake between leg and breast muscles did not differ significantly during later development. The results suggest at least a partial pre-natal differentiation of skeletal muscle in the domestic fowl.