This is the revolting footage captured by an undercover investigator who worked at 25 farms in England in May and June, who aimed to send it to the Royal Society for the Prevention of Cruelty to Animals (RSPCA) for further investigation.

In the video, the innocent sheep were seen to be slammed to the ground mercilessly, as the workers roughly shear off their wool. Due to their crude and rushed shaving technique, the workers often wound the animals, and would stitch up wounds on the stop with no anaesthetic, causing the poor animal to scream in pain.

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"The shearers are paid between 85p and £1 per sheep, so they are incentivised to work as quickly as possible," said the investigator, who preferred to remain unnamed. 

"The sheep don't like being sheared so they struggle a bit. When it's a hot day and they are really tired the shearers would often completely lose it and take it out on the animals. 

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"It was extremely common to see that; workers punching or kicking sheep, throwing them around or stamping on their necks to pin them down.

"If the sheep were cut while they were being sheared then the worker would just get a needle and thread out and sew the wound up as quickly as possible with no anaesthetic. 

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"By stopping to do that he was losing money so it was always rushed and you could see the animal was in huge pain."

Andrew Butler, the spokesman for PETA Asia accused the industry of ignoring animal welfare, saying: "They are prey animals and as soon as you isolate one from the flock to shear them or transport them that causes immediate distress to that animal."

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One offended netizen commented: "Sadistic bullies. Cowards usually express themselves, by picking on, or hurting someone weaker than themselves."