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Characterisation of embryonic cardiac-derived troponin T in broiler chicks bled one to 168 hours after hatching
M H Maxwell1, G W Robertson, D Moseley
1Roslin Institute (Edinburgh), Midlothian.
Insights
Troponin T levels peaked 12 hours post-hatching in chicks, indicating a physiological stress response to hatching. This cardiac biomarker elevation, alongside heterophil/lymphocyte ratios, suggests stress rather than direct genetic control.
Area of Science:
- Cardiology
- Animal Physiology
- Biochemistry
Background:
- Troponin T is a cardiac-specific protein released from injured heart tissue.
- Understanding cardiac stress markers in newly hatched chicks is crucial for avian health research.
Purpose of the Study:
- To measure Troponin T levels in fowl chicks at various time points after hatching.
- To investigate the relationship between Troponin T response and heterophil/lymphocyte ratios post-hatching.
Main Methods:
- Sera from fowl chicks were collected at 1, 12, 24, 48, 96, and 168 hours post-hatching.
- Troponin T levels were quantified in serum samples.
- Heterophil/lymphocyte (H/L) ratios were assessed in a subset of chicks.
Main Results:
- A peak in Troponin T levels was observed consistently 12 hours after hatching across two experiments.
- Elevated H/L ratios were noted at 1 and 12 hours post-hatching in the second experiment.
- The Troponin T peak at 12 hours correlates with increased H/L ratios.
Conclusions:
- The observed Troponin T response in chicks 12 hours post-hatching suggests a physiological stress reaction.
- This stress response is likely associated with the hatching process itself.
- The findings indicate that Troponin T elevation is not directly under genetic control in this context.
Abstract:
Troponin T, a cardiac-specific protein released only from damaged or injured heart tissue and cells, was measured in the sera from fowl chicks bled one, 12, 24, 48, 96 and 168 hours after hatching. A peak troponin T response was observed 12 hours after hatching in two experiments conducted six months apart. In the second experiment the heterophil/lymphocyte (H/L) ratios were also increased at one and 12 hours after hatching. The data suggest that the troponin T response in chicks bled 12 hours after hatching, together with the raised H/L ratios at the same age, may indicate a physiological stress reaction to the process of hatching, rather than a process which is under direct genetic control.