Pigs can benefit from being fed oregano, study shows.

Feeding lactating sows oregano essential oil helps maintain body condition and can also improve weights and reduce mortality when fed in piglet creep diets, leading to reduced use of antimicrobials, research has demonstrated. In both sow and piglet diets gut health additives were removed for the trial period - including zinc oxide. There was no significant difference in feed intake in either sows or piglets, although sows fed oregano ate more consistently. [Extracted from the article]