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    Poultry Business – July 2025 issue

    By Chloe RyanJuly 1, 2025
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Feed & Nutrition

University trial demonstrates the benefits of oregano oil in pullet rearing

Chloe RyanBy Chloe RyanMay 1, 20202 Mins Read
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Feeding oregano essential oil (OEO) to pullets during rearing can help to improve flock uniformity, reproductive fitness and feed efficiency, according to research undertaken at North Carolina State University in the USA.

Rearing healthy, high quality pullets with a diverse and well-populated gut microbiome is important for lifetime performance. The complex gut microbiome of poultry species plays a crucial role in digestion, nutrient absorption and immune function. Early establishment of a diverse microbiome population assists with intestinal crypt and villi development, two important intestinal structures associated with feed digestion and nutrient absorption.

North Carolina State University researcher, Dr Ken Anderson, undertook a trial at the Piedmont Research Station in conjunction with feed additive manufacturer Anpario, to determine the effect of supplementing Orego-Stim Powder in pullet feed throughout rearing on pullet performance and body confirmation.

Dekalb White chicks from day-old were allocated to one of two groups; either a control group with no additive in the feed, or a treatment group offered feed supplemented with 300g of Orego-Stim per tonne of feed.

“The results of the trial showed that OEO supplementation had a positive effect on pullet reproductive fitness, specifically in body development with increased shank length and a higher rear quarter percentage”, explained Dr Anderson. “Additionally, whilst body weight did not differ between treatment groups as birds were grown to breed guidelines, flock body weight uniformity was less variable in pullets supplemented with OEO”, he added. The trial also demonstrated optimised feed efficiency in pullets offered OEO in the diet, resulting in an improved FCR.

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Chloe Ryan

Editor of Poultry Business, Chloe has spent the past decade writing about the food industry from farming, through manufacturing, retail and foodservice. When not working, dog walking and reading biographies are her favourite hobbies.

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