Hypoxia in neonatal calves: effect on selected metabolic parameters

Area of Science:

• Veterinary Medicine
• Neonatal Physiology
• Metabolic Research

Background:

• Neonatal calves are susceptible to hypoxic events postpartum.
• Understanding metabolic responses to hypoxia is crucial for calf health.
• Hypoxia can significantly impact physiological parameters in newborns.

Purpose of the Study:

• To investigate the effects of 24-hour hypoxic hypoxia on metabolic parameters in neonatal calves.
• To assess the impact of reduced oxygen tension on plasma glucose, lactate, fructose, and IgG levels.
• To analyze arterial blood gases and pH changes during and after hypoxic exposure.

Main Methods:

• 12 neonatal calves were divided into hypoxic (10.5% O2) and normoxic (21% O2) groups for 24 hours postpartum.
• Three dietary treatments (colostrum, whole milk, fasting) were applied during the initial 24 hours.
• Plasma metabolites (glucose, lactate, fructose, IgG) and arterial blood gases were measured.
• Calves were subsequently exposed to normoxic conditions and fed according to a set schedule.

Main Results:

• Hypoxic calves exhibited significantly higher plasma lactate concentrations compared to normoxic controls.
• A progressive primary metabolic acidosis was observed in calves subjected to hypoxia.
• Arterial partial pressure of carbon dioxide decreased after the hypoxic period.
• Plasma glucose levels tended to be lower in hypoxic calves, though not statistically significant.

Conclusions:

• Short-term hypoxic hypoxia in neonatal calves induces significant metabolic acidosis primarily due to increased lactate.
• Dietary interventions and recovery periods influence metabolic recovery.
• These findings highlight the critical impact of oxygen availability on neonatal calf metabolism and acid-base balance.