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The cows grow more slowly - typically taking three years to reach a full weight before they are slaughtered, compared with just 15 months for conventional beef cattle.

Johnny Tuft, a fourth generation farmer from Ballinderry in County Antrim, farms a mixed farm with beef cattle, sheep, arable and poultry units and is often exposed to dust particles.

Two beef cattle operations would be permitted to stay in the park and seven ranches would remain in the adjoining Golden Gate National Recreation Area.

This is the first study to test seaweed on grazing beef cattle in the world.

She and her husband of 49 years, Tim, 74, now run a beef cattle business, which she acknowledged depends on a Latino workforce.