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https://doi.org/10.5713/ab.21.0275    [Accepted] Published online September 15, 2021.
Dietary encapsulated essential oil mixture influence on apparent nutrient digestibility, serum metabolic profile, lymphocyte histochemistry and intestinal morphology of laying hens
Cavit Arslan1,*  , Abdurrahman Pirinç2  , Nizamettin Eker2  , Emrah Sur3  , İlknur Ündağ3  , Tansu Kuşat2 
1Department of Animal Nutrition and Nutritional Disease, Faculty of Veterinary Medicine, Selcuk University, 42100 Campus, Selcuklu, Konya, Turkey
2Healty Science Institute, Selcuk University, 42100 Campus, Selcuklu, Konya, Turkey
3Department of Histology and Embryology, Faculty of Veterinary Medicine, Selcuk University, 42100 Campus, Selcuklu, Konya, Turkey
Correspondence:  Cavit Arslan, Tel: +90-536-3882354, Fax: +90-332-2410063, Email: carslan42@hotmail.com
Received: 11 June 2021   • Revised: 20 July 2021   • Accepted: 27 August 2021
Abstract
Objective
The study was aimed to evaluate the effects of a mixture of encapsulated essential oils addition on nutrient digestion, serum biochemical parameters, peripheral blood alpha-naphthyl acetate esterase (ANAE), and acid phosphatase (ACP-ase) positive lymphocyte ratios and intestinal morphology in laying hens.
Methods
A total of 320 laying hens of 48-wk-old were randomly allotted into 4 treatment groups with 10 replicates of 8 birds in each replicate. The birds were fed a basal diet (Control) or the diet added with mixture of EOs (which consist of eugenol, nerolidol, piperine, thymol, linalool, and geraniol) at 50, 100, and 200 mg/kg for period of 84 days.
Results
The addition of EOs at 100 or 200 mg/kg increased the dry matter, organic matter, and crude protein digestion as compared to Control. The addition of all doses of EOs did not affect serum GGT, ALT, and P but increased serum AST concentration. The addition of 200 mg/kg EOs increased serum creatinine, while 100 mg/kg decreased Ca concentration. The addition of 100 and 200 mg/kg EOs generally improved ANAE and ACP-ase positive peripheral blood lymphocyte ratios and intestinal morphology.

Conclusion

It can be concluded that, the addition of 100 or 200 mg/kg encapsulated essential oils generally increased apparent nutrient digestion and serum AST concentration, improved ANAE and ACP-ase positive peripheral blood lymphocytes and intestinal morphology in laying hens.
Keywords: ACP-ase; ANAE; Blood; Essential Oils Mixture; Intestinal Morphology; Laying Hens; Nutrient Digestibility
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