Effects of stocking density on lambs being transported by road

Area of Science:

• Animal Science
• Agriculture
• Veterinary Medicine

Background:

• Transportation is a significant stressor for livestock.
• Stocking density is a critical factor influencing animal welfare during transport.
• Understanding the interplay between stocking density, season, and lamb physiology is vital for improving animal handling practices.

Purpose of the Study:

• To investigate the effects of varying stocking densities on lamb behavior and physiological responses during 24-hour transport.
• To compare these effects between summer and winter conditions.
• To determine if stocking density exacerbates or mitigates transport-induced stress.

Main Methods:

• Lambs (shorn in summer, fleeced in winter) were transported for 24 hours at four different stocking densities (m²/100 kg).
• Behavioral observations (lying down, resting) were recorded.
• Plasma creatine kinase levels and body temperature were measured as indicators of physiological stress.

Main Results:

• Higher stocking densities led to reduced lying down and resting behavior in lambs.
• Plasma creatine kinase levels significantly increased at the highest stocking density during winter transport.
• A decrease in body temperature was observed during transport, more pronounced in shorn lambs during summer.
• The highest stocking density resulted in a smaller decrease in body temperature.

Conclusions:

• Stocking density influences lamb behavior and physiological stress, with higher densities negatively impacting welfare.
• Transport stress, including hypothermia, is a significant welfare concern for lambs, irrespective of stocking density.
• Further research into optimal stocking densities and transport management strategies is warranted to minimize stress and maintain lamb health.