A vegan teacher who criticised a dairy farm in a Facebook post has claimed his actions on the social networking site lost him his job.

Keith Allison posted a snap of a dairy farm which was using crates to hold baby calves in Smithville, Ohio, US.

Mr Allison branded the farm inhumane for separating calves from their "loving mothers".

He wrote: As someone who grew up feeling parental love and support, and now as a parent who gives love and support, I reject the claim that separating babies from loving mothers to raise them isolated in boxes can ever be considered humane."

After that he said the school district pulled his one-year contract when it was up for renewal.

He told Fox 8: I was informed by my superintendent that the family that owns this farm had called and complained about it and expressed that they were upset and frightened about the post.

The fact that their familys farm was in the picture, I guess, is where their complaint was coming from and from what I was told, they were fearful, afraid that someone might come and break their calf crates or free their cows and their children were not safe to be out in their yards."

Away from work, Mr Allison is animal rights advocate, who openly posts his beliefs on his personal Facebook page.

He said he was riding his bicycle by a local dairy farm in August when he took the picture.

The picture shows what he described as crates which are used to house calves who are separated from their mothers at birth.

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Vegan teacher claims he lost job after Facebook post criticised 'inhumane' dairy farm