Battery cages for domestic egg-laying hens usually have no dust bathing substrate.

This is considered to be a welfare concern and as a consequence, dust bathing has been closely studied in domestic egg-laying hens.

In 1971, there were 125,258 farms with egg-laying hens and by 1999 this was down to 26,500.

The inmates have a vegetable garden and egg-laying hens.

This contrasts with the industrial practices surrounding egg-laying hens, which produce eggs for human consumption without being fertilized.

The law would mostly impact the state's 18 million egg-laying hens.

In egg-laying hens, heavy infection significantly reduces egg production.

Free-range farming of egg-laying hens is increasing its share of the market.

Eventually, permits would be required for any farm with more than 1,000 cattle, 2,500 swine or 100,000 egg-laying hens.

There was a well known sentence about the conditions concerning egg-laying hens, in 1988.