[
Ahmed A.M.H., Rodrigez-Navarro A.B., Vidal M.L., Gautron J., Garcia-Ruiz J.M., Nys Y. (2005). Changes in eggshell mechanical properties, crystallographic texture and in matrix proteins induced by moult in hens. Br. Poult. Sci., 46: 268–279.10.1080/00071660500065425
]Search in Google Scholar
[
Altuntas E., Sekeroglu A. (2008). Effect of egg shape index on mechanical properties of chicken eggs. J. Food. Eng., 85: 606–612.10.1016/j.jfoodeng.2007.08.022
]Search in Google Scholar
[
Ar A., Paganelli C.V., Reeves R.B., Greene D.G., Rahn H. (1974). The avian egg: Water vapor conductance, shell thickness, and functional pore area source. Condor, 76: 153–158.10.2307/1366725
]Search in Google Scholar
[
Athanasiadou D., Jiang W., Goldbaum D., Saleem A., Basy K., Pacella M.S., Böhm C.F., Chromik R.R., Hincke M.T., Rodríguez-Navarro A.B., Vali H., Wolf S.E., Gray J.J., Buy K.H., McKee M.D. (2018). Nanostructure, osteopontin, and mechanical properties of calcitic avian eggshell. Sci. Adv., 4: eaar3219.10.1126/sciadv.aar3219
]Search in Google Scholar
[
Bain M.M. (1990). Eggshell strength: A mechanical/ultrastructural evaluation. Ph.D. thesis, University of Glasgow, UK.
]Search in Google Scholar
[
Bartell S.M., Batal A.B. (2007). The effect of supplemental glutamine on growth performance, development of the gastrointestinal tract, and humoral immune response of broilers. Poultry Sci., 86: 1940–1947.10.1093/ps/86.9.1940
]Search in Google Scholar
[
Burrin D.G., Stoll B. (2009). Metabolic fate and function of dietary glutamate in the gut. Am. J. Clin. Nutr., 90: 850S–856S.10.3945/ajcn.2009.27462Y
]Search in Google Scholar
[
De Ketelaere B., Govaerts T., Coucke P., Dewil E., Visscher J., Decuypere E., De Baerdemaeker J. (2002). Measuring the eggshell strength of 6 different genetic strains of laying hens: Techniques and comparisons. Br. Poult. Sci., 43: 238–244.10.1080/00071660120121454
]Search in Google Scholar
[
Dos Santos F., Brandão M., Da Silva C., Machado L.D.S., Soares M., Barreto M., Nascimento E.D., Pereira V. (2014). Eggshell apex abnormalities in a free-range hen farm with Mycoplasma synoviae and infectious bronchitis virus in Rio de Janeiro state, Brazil. Braz. J. Poult. Sci., 16: 101–103.10.1590/1516-635x1602101-104
]Search in Google Scholar
[
Drabik K., Batkowska J., Vasiukov K., Putam A. (2020). The impact of eggshell colour on the quality of table and hatching eggs derived from Japanese quail. Animals, 10: 264.10.3390/ani10020264
]Search in Google Scholar
[
EFSA, European Food Safety Authority (2020). Safety and efficacy of L-glutamine produced using Corynebacterium glutamicum NITE BP-02524 for all animal species. EFSA J., 18: 6075.10.2903/j.efsa.2020.6075
]Search in Google Scholar
[
EU, European Union, Commission Regulation (EC) No 152/2009 of 27 January 2009 laying down the methods of sampling and analysis for the official control of feed. Off. J. Eur. Union, 54: 1–130.
]Search in Google Scholar
[
Festin M.F.W. (2018). On determining sample size in experiments involving laboratory animals. Lab. Anim., 52: 341–350.10.1177/0023677217738268
]Search in Google Scholar
[
Fritz C.O., Morris P.E., Richler J.J. (2012). Effect size estimates: Current use, calculations, and interpretation. J. Exp. Psychol., 141: 2–18.10.1037/a0024338
]Search in Google Scholar
[
Gholipour V., Camani M., Aghdam Shahryar H., Sadeghi A.A., Aminafshar M. (2017). Effects of dietary L-glutamine supplemented on performance, egg quality, fertility and some blood biochemical parameters in guinea fowls (Numida meleagridis). Kafkas Univ. Vet. Fak. Derg., 23: 903–910.
]Search in Google Scholar
[
Gholipour V., Camani M., Aghdam Shahryar H., Sadeghi A.A., Aminafshar M. (2019). Effects of dietary L-glutamine supplement on performance, characteristics of the carcase and intestinal morphometry in guinea fowl chickens (Numida meleagris). Ital. J. Anim. Sci., 18: 513–521.10.1080/1828051X.2018.1544856
]Search in Google Scholar
[
Goran G.V., Crivineanu V., Tudoreanu L., Udrea D. (2010). Dynamics of some mineral elements in hen eggs. Bull. Univ. Agric. Sci. Vet. Med. Cluj-Napoca Vet. Med., 67: 88–95.
]Search in Google Scholar
[
Hamilton R.M.G. (1982). Methods and factors that affect the measurement of egg shell quality. Poultry Sci., 61: 2022–2039.10.3382/ps.0612022
]Search in Google Scholar
[
Jazideh F., Farhoomand P., Daneshyar M., Najafi G. (2014). The effects of dietary glutamine supplementation on growth performance and intestinal morphology of broiler chickens reared under hot conditions. Turk. J. Vet. Anim. Sci., 38: 264–270.10.3906/vet-1210-32
]Search in Google Scholar
[
Kibala L., Rozempolska-Rucińska I., Kasperek K., Zięba G., Łukaszewicz M. (2015). Ultrasonic eggshell thickness measurement for selection of layers. Poultry Sci., 94: 2360–2362.10.3382/ps/pev254
]Search in Google Scholar
[
Luquetti B.C., Fernandez Alarcon M.F., Lunedo R., Borges Campos D.M., Furlan R.L., Macari M. (2016). Effects of glutamine on performance and intestinal mucosa morphometry of broiler chickens vaccinated against coccidiosis. Sci. Agricol., 73: 322–327.10.1590/0103-9016-2015-0114
]Search in Google Scholar
[
Mabe I., Rapp C., Bain M.M., Nys Y. (2003). Supplementation of a corn-soybean meal diet with manganese, copper, and zinc from organic or inorganic sources improves eggshell quality in aged laying hens. Poultry Sci., 82: 1903–1913.10.1093/ps/82.12.1903
]Search in Google Scholar
[
Mohsenin N.N. (1986). Physical properties of plant and animal materials: structure, physical characteristics and mechanical properties. 2nd ed. Gordon and Breach, London.
]Search in Google Scholar
[
Mori H., Takaya M., Nishimura K., Goto T. (2020). Breed and feed affect amino acid contents of egg yolk and eggshell color in chickens. Poultry Sci., 99: 172–178.10.3382/ps/pez557
]Search in Google Scholar
[
Mortola J.P. (2009). Gas exchange in avian embryos and hatchlings. Comp. Biochem. Physiol. A, 153: 359–377.10.1016/j.cbpa.2009.02.041
]Search in Google Scholar
[
Murray R.K., Granner D.K., Mayes P.A., Rodwell V.W. (2000). Harper’s Biochemistry. 25th ed. McGraw-Hill Medical.
]Search in Google Scholar
[
Narushin V.G. (2005). Egg geometry calculation using the measurements of length and breadth. Poultry Sci., 84: 482–484.10.1093/ps/84.3.482
]Search in Google Scholar
[
Nys Y., Le Roy N. (2018). Calcium homeostasis and eggshell biomineralization in female chicken. In: Vitamin D. Volume 1: Biochemistry, physiology and diagnostics, Feldman D. (ed.). 4th Ed., Academic Press, pp. 361–382.10.1016/B978-0-12-809965-0.00022-7
]Search in Google Scholar
[
Orczewska-Dudek S., Pietras M., Puchała M., Nowak J. (2020). Camelina sativa oil and camelina cake as sources of polyunsaturated fatty acids in the diets of laying hens: effect on hen performance, fatty acid profile of yolk lipids, and egg sensory quality. Ann. Anim. Sci., 20: 1365–1377.10.2478/aoas-2020-0047
]Search in Google Scholar
[
Park J.A., Shon S.H. (2018). The influence of hen aging on eggshell ultrastructure and shell mineral components. Korean J. Food Sci. Anim. Res., 38: 1080–1091.10.5851/kosfa.2018.e41
]Search in Google Scholar
[
Radwan L.M., Fathi M.M., Galal A., Zein El-Dein A. (2010). Mechanical and ultrastructural properties of eggshell in two Egyptian native breeds of chicken. Int. J. Poult. Sci., 9: 77–81.10.3923/ijps.2010.77.81
]Search in Google Scholar
[
Rodriguez-Navarro A., Kalin O., Nys Y., Garcia-Ruiz J.M. (2002). Influence of the microstructure on the shell strength of eggs laid by hens of different ages. Br. Poult. Sci., 43: 395–40310.1080/0007166012010367512195799
]Search in Google Scholar
[
Roudybush T., Hoffman L., Rahn H. (1980). Conductance, pore geometry, and water loss of eggs of Cassin’s Auklet. Condor, 82: 105–106.10.2307/1366797
]Search in Google Scholar
[
Sakamoto M.I., Murakami A.E., Silveira T.G.V., Fernandes J.I.M., De Oliveira C.A.L. (2006). Influence of glutamine and vitamin E on the performance and the immune responses of broiler chickens. Braz. J. Poult. Sci., 8: 243–249.10.1590/S1516-635X2006000400007
]Search in Google Scholar
[
Smulikowska S., Rutkowski A. (2018). Editors. Recommended allowances and nutritive value of feedstuffs – poultry feeding standards (in Polish). 5th ed. The Kielanowski Institute of Animal Physiology and Nutrition, Jabłonna, Poland, PAS.
]Search in Google Scholar
[
Sokołowicz Z., Krawczyk J., Dykiel M. (2018). The effect of the type of alternative housing system, genotype and age of laying hens on egg quality. Ann. Anim. Sci., 18: 541–555.10.2478/aoas-2018-0004
]Search in Google Scholar
[
Solomon S.E. (2010). The eggshell: strength, structure and function. Br. Poult. Sci., 51(supl1): 52–59.10.1080/00071668.2010.497296
]Search in Google Scholar
[
Soltan M.A. (2008). Effect of dietary organic acid supplementation on egg production, egg quality and some blood serum parameters in laying hens. Int. J. Poult. Sci., 7: 613–621.10.3923/ijps.2008.613.621
]Search in Google Scholar
[
Soltan M.A. (2009). Influence of dietary glutamine supplementation on growth performance, small intestine morphology, immune response and some blood parameters of broiler chickens. Int. J. Poult. Sci., 8: 60–68.10.3923/ijps.2009.60.68
]Search in Google Scholar
[
Świątkiewicz S., Arczewska-Włosek A., Krawczyk J., Szczurek W., Puchała M., Józefiak D. (2018). Effect of selected feed additives on egg performance and eggshell quality in laying hens fed a diet with standard or decreased calcium content. Ann. Anim. Sci., 18: 167–183.10.1515/aoas-2017-0038
]Search in Google Scholar
[
Świątkiewicz S., Arczewska-Włosek A., Szczurek W., Calik J., Bederska-Łojewska D., Orczewska-Dudek S, Muszyński S., Tomaszewska E., Józefiak D. (2020). Algal oil as source of polyun saturated fatty acids in laying hens nutrition: Effect on egg performance, egg quality indices and fatty acid composition of egg yolk lipids. Ann. Anim. Sci., 20: 961–973.10.2478/aoas-2020-0019
]Search in Google Scholar
[
Tomaszewska E., Świątkiewicz S., Arczewska-Włosek A., Wojtysiak D., Dobrowolski P., Domaradzki P., Świetlicka I., Donaldson J., Hułas-Stasiak M., Muszyński S. (2020). Alpha-ketoglutarate: An effective feed supplement in improving bone metabolism and muscle quality of laying hens: A preliminary study. Animals, 10: 2420.10.3390/ani10122420
]Search in Google Scholar
[
Tyler C. (1953). Studies on egg shells. II – A method for marking and counting pores. J. Sci. Food Agric., 4: 266–272.10.1002/jsfa.2740040603
]Search in Google Scholar
[
Xiao D., Zeng L., Yao K., Kong X., Wu G., Yin Y. (2016). The glutamine-alpha-ketoglutarate (AKG) metabolism and its nutritional implications. Amino Acids, 48: 2067–2080.10.1007/s00726-016-2254-8
]Search in Google Scholar
[
Xiao J.F., Zhang Y.N., Wu S.G., Zhang H.J., Yue H.Y., Qi G.H. (2014). Manganese supplementation enhances the synthesis of glycosami-noglycan in eggshell membrane: A strategy to improve eggshell quality in laying hens. Poultry Sci., 93: 380–388.10.3382/ps.2013-03354
]Search in Google Scholar
[
Xue G.D., Barekatain R., Wu S.B., Choct M., Swick R.A. (2018). Dietary L-glutamine supplementation improves growth performance, gut morphology, and serum biochemical indices of broiler chickens during necrotic enteritis challenge. Poultry Sci., 97: 1334–1341.10.3382/ps/pex444
]Search in Google Scholar
[
Zavarize K.C., Sartori J.R., Pezzato A.C., Garcia E.A., Cruz V.C. (2011). Glutamine in diet of laying hens submitted to heat stress and thermoneutrality. Ci. Anim. Bras., 12: 400–406.10.5216/cab.v12i3.2535
]Search in Google Scholar
[
Zhang Y., Li H., Zhang Y., Song F. (2018). Statistical optimization and batch studies on adsorption of phosphate using Al-eggshell. Adsorp. Sci. Technol., 36: 026361741774079.10.1177/0263617417740790
]Search in Google Scholar
