Mitochondrial complex I protein differs among residual feed intake phenotype in beef cattle
1Research Institute Flávio Guarani, Rehagro-Belo Horizonte, MG, Brazil.
Journal of Animal Science
|June 27, 2013
Summary
Mitochondrial complex I (CI) protein levels are linked to metabolic efficiency in cattle. Lower residual feed intake (RFI) in cattle correlates with higher CI concentration, suggesting a role for mitochondrial function in feed efficiency.
Area of Science:
- Animal Science
- Biochemistry
- Metabolic Physiology
Background:
- Residual Feed Intake (RFI) is a measure of feed efficiency in livestock.
- Mitochondrial function plays a crucial role in energy metabolism.
- Understanding factors influencing RFI can improve animal production efficiency.
Purpose of the Study:
- To investigate the relationship between residual feed intake (RFI) and mitochondrial complex I (CI) protein levels in cattle.
- To determine if variations in CI quantity or subunit concentration are associated with differences in metabolic efficiency.
Main Methods:
- Four experiments involving crossbred Angus and Braunvieh cattle (steers and heifers) were conducted.
- Residual Feed Intake (RFI) was calculated as the difference between predicted and actual Dry Matter Intake (DMI).
- Mitochondrial CI protein quantity was measured using ELISA kits and gel electrophoresis in isolated lymphocytes.
Main Results:
- A significant difference was observed between RFI and DMI, but not for Average Daily Gain (ADG) or metabolic midweight.
- Cattle with low RFI exhibited significantly greater CI concentration in mitochondria compared to other groups.
- A trend for higher Band I (protein S1) concentration was observed in low RFI animals, with a significant negative correlation between RFI and Band I.
Conclusions:
- Mitochondrial function, specifically related to complex I, contributes to metabolic efficiency differences among cattle.
- Lower RFI is associated with higher mitochondrial CI levels, indicating a potential mechanism for improved feed utilization.
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