1- Abou-Elkhair, R., S. Selim, and E. Hussein. 2018. Effect of supplementing layer hen diet with phytogenic feed additives on laying performance, egg quality, egg lipid peroxidation and blood biochemical constituents. Animal Nutrition, 4(4): 394-400.
2- Aderemi, F., O. Alabi, and O. Ayoola. 2013. Evaluating pepper (Capsicum annuum) and garlic (Allium sativum) on performance egg trait and serum parameters of old layers. Journal of Biology, Agriculture and Healthcare, 3(7):90-95.
3- Acamovic, T., and J. D. Brooker. 2005. Biochemistry of plant secondary metabolites and their effects in animals. Proceedings of the Nutrition Society, 64(3): 403-412.
4- Agostini, P. S., D. Sola-Oriol, M. Nofrarias, A. C. Barroeta, J. Gasa, and E. G. Manzanilla. 2012. Role of in-feed clove supplementation on growth performance, intestinal microbiology, and morphology in broiler chicken. Livestock Science, 147: 113-118.
5- Al-Kaissy, G. A., and Y. J. Jamel. 2009. The effect of adding thyme vulgaris and Cinnamomun zeylanicum on production performance and some blood traits in broiler chicken. Journal of Veterinary Medicine, 33(2): 84-90.
6- Anand, P., K. Y. Murali, V. Tandon, P. S. Murthy, and R. Chandra. 2010. Insulinotropic effect of cinnamaldehyde on transcriptional regulation of pyruvate kinase, phosphoenolpyruvate carboxykinase, and GLUT4 translocation in experimental diabetic rats. Chemico-Biological Interactions, 186(1): 72-81.
7- Arpasova, H., B. Galik, C. Hrncar, M. Fik., R. Herkei, and V. Pistova. 2015. The effect of essential oils on performance of laying hens. Scientific Papers Animal Science and Biotechnologies, 48(2): 8-14.
8- Bahrami, M., F. Shariatmadari, and T. M. Karimi. 2011. Effect of dietary extract of thyme and peppermint and vitamin E supplementation on immune responses of laying hen in heat stress and content of peroxidation egg during storage. Iranian Journal of Medicinal and Aromatic Plants, 27: 326-337. (In Persian)
9- Bozkurt, M., A. Alcicek, M. Cabuk, K. Kucukyilmaz, and A. U. Catli. 2009. Effect of an herbal essential oil mixture on growth, laying traits, and egg hatching characteristics of broiler breeder. Poultry Science, 88: 2368-2374.
10- Cupo, M., and W. E. Donaldson. 1987. Chromium and vanadium effects on glucose metabolism and lipid synthesis in chicks. Poultry Science, 66(1): 120–126.
11- Ding, X., Y. Yu, Z. Su, and K. Zhang. 2017. Effects of essential oils on performance, egg quality, nutrient digestibility and yolk fatty acid profile in laying hens. Animal Nutrition, 3: 127-131.
12- El-Hack, M. A., and M. Alagawany. 2015. Performance, egg quality, blood profile, immune function, and antioxidant enzyme activities in laying hens fed diets with thyme powder. Journal of Animal and Feed Sciences, 24: 127-133.
13- Frankiv, T., M. Voljc, J. Salobir, and V. Rezar. 2009. Use of herbs and spices and their extracts in animal nutrition. Acta Argiculturae Slovenica, 94(2): 95-102.
14- Ghorbani, M. R., M. Bojarpur, M. Mayahi, J. Fayazi, R. F. Tabatabaei, and S. Tabatabaei. 2013. Effect of purslane (Portulaca oleracea L.) on blood lipid concentration and antioxidant status of broiler chickens. Online Journal of Veterinary Research, 17(2): 54-63.
15- Hashemipor, H., H. Kermanshahi, A. Golian, A. Raji, and M. M. Van Krimpen. 2013. Effect of thymol and carvacrol by next enhance 150 ® on intestinal development of broiler chickens fed CMC containing diet. Iranian Journal of Applied Animal Science, 3 (3): 567-576.
16- Haselmeyer, A., J. Zentek, and R. Chizzola. 2015. Effects of thyme as a feed additive in broiler chickens on thymol in gut contents, blood plasma, liver and muscle. Journal of the Science of Food and Agriculture, 95 (3): 504-508.
17- Jamroz, D., J. Orda, C. Kamel, A. Wiliczkiewlcz, T. Wertelecki, and J. Skorupinska. 2003. The influence of phytogenic extract on performance, nutrient digestibility, carcass characteristics and gut microbial status in broiler chickens. Journal of Animal and Feed Sciences, 12 (2): 583-596.
18- Jamroz, D., A. Wiliczkiewicz, T. Wertelecki, J. Orda, and J. Skorupinska. 2005. Use of active substances of plant origin in chicken diets based on maize and locally grown cereals. British Poultry Science, 46 (4): 485-493.
19- Jang, I. S., Y. H. Ko, S. Y. Kang, and C.Y. Lee. 2007. Effect of a commercial essential oil on growth performance, digestive enzyme activity and intestinal microflora population in boiler chickens. Animal Feed Science and Technology, 134 (4): 304-315.
20- Kamato, G. P., N. P. Makunga, W. P. Ramogola, and A. M. Viljoen. 2008. A review of biological activities and phytochemistry. Journal of Ethnopharmacology, 119 (3): 664-672.
21- Lee, K. W., Beynen, A. C. and everts, H. 2002. Essential oils in boiler nutrition department of nutrition, faculty of veterinary medicine, Trecht University, the Netherlands. Pp: 7-41.
22- Lee, K. W., H. Everts, and A. C. Beyen. 2003. Dietary carvacrol lowers body gain but improves feed conversion in female broiler chickens. Journal of Applied Poultry Research, 12(4): 394-399.
23- Lee, K. W., H. Everts, H. J. Kappert, H. Wouterse, A. Frehner, and A. C. Beynen. 2004. Cinnamanaldehyde, but not thymol, counteracts the carboxymethyl cellulose induced growth depression in female broiler chickens. International Journal of Poultry Science, 3(9): 608-612.
24- Lis-Balchin, M. 2003. Feed additives as alternatives to antibiotic growth promoters: botanicals. Page 333-352 In Proc. International Symposium on Digestive Physiology in Pigs, Banff AB, Canada. University of Alberta.
25- Lokaewmanee, K., K. E. Yamauchi, T. Komori, and K. Saito. 2010. Effects on egg yolk colour of paprika or paprika combined with marigold flower extracts. Italian Journal of Animal Science, 9(4): 356-359.
26- Lokaewmanee, K. 2019. Effect of chili leaf powder on laying hen performance, egg quality and egg yolk cholesterol levels. Journal of Poultry Science, 18(4): 168-173.
27- Miles, R. D., G .D. Butcher, P. R. Henry, and R. C. Littell. 2006. Effect of antibiotic growth promoters on broiler performance, intestinal growth parameters, and quantitative morphology. International Journal of Poultry Science, 85(3): 476-485.
28- Moeini, M. M., S. H. Ghazi, S. Sadeghi, and M. Malekizadeh. 2013. The effect of red pepper (Capsicum annuum) and marigold flower (Tageteserectus) powder on egg production, egg yolk color and some blood metabolites of laying hens. Journal of Applied Animal Science, 3(2): 301-305.
29- Mohebbifar, A., and M. Torki. 2010. Effects of adding mixed powder of garlic and thyme to diets included graded levels of rice bran on productive performance of laying hens and egg quality characteristics. Advances in Environmental Biology, 4(3): 469-476.
30- Moraleco, D. D., J. K.Valentim, L. G. Silva, H. H. D. A. Lima, T. M. Bitencourtt, and G. M. Dallago. 2019. Egg quality of laying hens fed diets with plant extracts. Acta Scientiarum. Animal Sciences, 41.
31- Platel, K., and K. Srinivasan. 2003. Digestive stimulant action of spices: A myth or reality. Indian Medicine, 119(5): 167-179.
32- Pilevar, M., J. Arshami, A. Golian, and M. R. Basami. 2010. The effects of different sources and levels of polyunsaturated fatty acids (n-3) on immune and reproduction system in leghorn pullet chicks. Page 3928-3931. The 4th Congress on Animal Science. University of Tehran, Iran. (In Persian).
33- Pirgozliev, V., S. C. Mansbridge, S. P. Rose, A. M. Mackenzie, A. Beccaccia, F. Karadas, and D. Bravo. 2019. Dietary essential oils improve feed efficiency and hepatic antioxidant content of broiler chickens. Animal, 13(3): 502-508.
34- Renema, R. A., F. E. Robinson, H. H. Oosterhoff, J. J. Feddes, and J. L. Wilson. 2001. Effect of phtostimulatory light intensity on ovarian morphology and carcass traits at sexual maturity in modern and antique egg-type pullets. Poultry Science, 80: 47-56.
35- Roofchaei, A., V. Rezaeipour, S.Vatandour, and F. Zaefarian. 2019. Influence of dietary carbohydrases, individually or in combination with phytase or an acidifier, on performance, gut morphology and microbial population in broiler chickens fed a wheat-based diet. Animal Nutrition, 5(1): 63-67.
36- Saki, A. A., H. Aliarabi, S. A. H. Siyar, J. Salari, and M. Hashemi. 2014. Effect of a phytogenic feed additive on performance, ovarian morphology, serum lipid parameters and egg sensory quality in laying hen. Veterinary Research Forum, 5(4): 287-293.
37- Silversides, F.G., and P. Villeneuve. 1994. Is the Haugh unit correction for egg weight valid for eggs stored at room temperature? Poultry Science, 73(1): 50-55.
38- SAS Institute. 2005. SAS Users guide: Statistics. Version 9.1. SAS Institute Inc., Cary, NC.
39- Taki, A., S. Salari, M. Bojarpor, M. Sari, and M. Taghizade. 2013. The effect of foeniculum vulgare essence on production performance, egg quality and reproductive parameters of laying hens. Iranian Journal of Animal Science Research, 6: 140-149. (In Persian).
40- Tatli, O., I. E. Nikerel, and B. S. Ozdemir. 2015. Evaluation of metabolite extraction protocols and determination of physiological response to drought stress via reporter metabolites in model plant Brachypodium distachyon. Turkish Journal of Botany, 39(6): 1042-1050.
41- Tamam, S. M., M. S. Abdel Hamid, M. H. Samah, and A. N. Marwa. 2017. The anti-viral and immunomodulatory activity of cinnamon zeylanicum against" NDV" newcastle disease virus in chickens. International Journal of Sciences: Basic and Applied Research, 32(2): 251-262.
42- Torki, M., M. Akbari, and K. Kaviani. 2015. Single and combined effects of zinc and cinnamon essential oil in diet on productive performance, egg quality traits, and blood parameters of laying hens reared under cold stress condition. International Journal of Biometeorology, 59(9):1169-1177.
43- Tschirch, H. 2000. The use of natural plants extracts as production enhancers in modern animal rearing practices. Zeszyty Naukowe Akademii Rolniczej Wroclaw, Zootechnika. 25:25-39.
44- Upadhyaya, I., A. Upadhyay, A. Kollanoor-Johny, S. Mooyottu, S. A. Baskaran, H. B. Yin, and K. Venkitanarayanan. 2015. In feed supplementation of trans-cinnamaldehyde reduces layer chicken egg borne transmission of Salmonella enterica serovar enteritidis. Applied Environmental Microbiology, 81(9): 2985-2994.
45- Windisch, W., K. Schedle, C. Plitzner, and A. Kroismayr. 2008. Use of phytogenic products as feed additives for swine and poultry. Journal of Animal Science, 86: 140-148.
46- Zeng, Z., S. Zhang, H. Wang, and X. Piao. 2015. Essential oil and aromatic plants as feed additives in non-ruminant nutrition: a review. Journal of Animal Science and Biotechnology, 6(1):7.