Research suggests farm animals including cattle and pigs may experience something analogous to grief following the loss of bonded companions, with welfare implications.
The possibility that farm animals experience grief following companion loss adds another welfare dimension to management practices that cause social disruption. Frequent regrouping, transport, and slaughter of herd or flock members may create repeated grief-like experiences for surviving animals. While research remains limited, the precautionary principle suggests that minimizing unnecessary social disruption is warranted even absent definitive evidence of grief.