1. More about Pigs : The Humane Society of the United States
a semi-natural environment. Animal Production 48(2):419-25.
[136] Jensen P. 1986. Observations on the maternal behaviour of free-ranging domestic pigs. Applied Animal behaviour Science 16(2):131-42.
[137] Fraser AF. 1980. Farm Animal
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2. The Welfare of Birds at Slaughter : The Humane Society of the United States
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