Letter | Published:

Influence of Pregnancy and Social Facilitation on the Behaviour of the Grazing Sheep

Naturevolume 166page74 (1950) | Download Citation



BAYER1 has shown that the presence of a hungry hen can increase the food consumption of a well-fed hen by as much as 60 per cent. This social facilitation has also been observed in fish2, rats3 and apes4. It is now reported in grazing sheep.

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  1. 1

    Bayer, quoted by Katz, “Animals and Men. Studies in Comparative Psychology” (Longman, Green and Co., London, 1937).

  2. 2

    Welty, Physiol. Zool., 7, 85 (1934).

  3. 3

    Harlow, J. Genetic Psychol., 41, 211 (1932).

  4. 4

    Harlow, J. Comp. Psychol., 16, 171 (1933).

  5. 5

    Cushnie and White, Vet. Record, 60, 105 (1948).

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  1. Rowett Research Institute, Bucksburn, Aberdeenshire

    • D. E. TRIBE


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