Organic manganese additives may improve shell, layer performance

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Researchers from the US and China explored the long-term use of an organic form of manganese (Mn) in the diets of laying hens. The group published details of its project in the journal, Animal Feed Science and Technology​.  

“It is meaningful to investigate the effects of long-term dietary Mn supplementation in amino acid-complexed form with a wide range on performance, egg quality, redox status, hematology, plasma biochemical parameter and organ histopathological assessment in laying hens,” ​the researchers said. “High-dose levels were adopted to explore the limited inclusion of Mn, while other dose levels were set to obtain the appropriate Mn supplemental level in diet of Hy-Line Brown laying hens at age from 23 to 46 wk.”

The team found that adding 80mg/kg of manganese lowered the feed conversion ratio (FCR) and boosted egg production while adding 40mg/kg improved egg production, egg mass and decreased FCR.

Adding more than 20mg/kg of manganese to bird diets improved eggshell strength, they said. Adding 40 or 80mg/kg increased superoxide dismutase (T-SOD,) however, that response declined if more than 120mg/kg were included in the feed.

When 400 and 800mg/kg Mn were added, birds displayed increased white blood cells, platelet and creatinine along with inflammation in kidney tissue, the authors reported.

“Dietary Mn supplementation could increase egg mass, decrease FCR, and improve eggshell breaking strength and redox status of laying hens, with a level of 40 mg/kg from Mn-amino acid complexes,” ​the researchers said. “More than 400 mg/kg Mn supplementation could cause local inflammation in kidney.”

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