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Effects of hypocalcaemia on abomasal motility
1Department of Agricultural and Urban Practice, Virginia-Maryland Regional College of Veterinary Medicine, Blacksburg 24061.
Research in Veterinary Science
|March 1, 1988
Summary
Hypocalcaemia (low blood calcium) did not cause abomasal atony in cows until a critical threshold was reached. Abomasal motility returned once calcium levels increased past this specific threshold.
Area of Science:
- Veterinary Medicine
- Animal Physiology
- Ruminant Nutrition
Background:
- Abomasal atony, a common gastrointestinal disorder in dairy cows, can lead to significant production losses.
- The role of hypocalcaemia (low blood calcium) in the pathogenesis of abomasal atony is not fully understood.
- Understanding the relationship between calcium levels and abomasal function is crucial for diagnosing and managing digestive issues in cattle.
Purpose of the Study:
- To investigate the direct effects of induced hypocalcaemia on abomasal mechanical and myoelectric activity in Holstein cows.
- To determine if a specific serum calcium threshold exists below which abomasal motility ceases.
- To evaluate the clinical relevance of hypocalcaemia as a cause of abomasal atony.
Main Methods:
- Two adult Holstein cows were used to measure abomasal mechanical and myoelectric activity.
- Hypocalcaemia was experimentally induced via a constant infusion of disodium EDTA.
- Serum total and diffusible calcium concentrations were continuously monitored throughout the experiment.
Main Results:
- Abomasal motility, both mechanical and electrical, remained unaffected by declining calcium levels until a threshold of 1.2 +/- 0.2 mmol litre-1 was reached.
- Below this critical calcium threshold, all abomasal mechanical and electrical activity ceased.
- A similar threshold effect was observed when calcium concentrations were experimentally increased.
Conclusions:
- The study suggests that hypocalcaemia alone may not be a primary clinical cause of abomasal atony in dairy cows.
- A distinct threshold for serum calcium exists, below which abomasal motility is completely abolished.
- These findings indicate a direct but threshold-dependent relationship between calcium levels and abomasal function, challenging the widespread clinical assumption of hypocalcaemia as a direct cause of atony.