The article presents the results of morphometric analysis of the duodenum of broiler chickens of the cross ROSS 308 in early ontogenesis. By the end of the first day, the duodenum of chickens has all the morphological structures characteristic of this part of the small intestine. Intestinal villi in the proximal part of the intestine are predominantly finger-shaped and leaf-shaped. The height of the villi of the duodenum increases significantly during the first two weeks after withdrawal. In the proximal part it increases by 40.78%, and in the caudal part - by 43.40%. By the 2-3 day, the number of crypts, their size and the number of cells increases. By the 15th day, the number of crypts and the depth of their occurrence increases. The length of the crypts from the base of the villi to the bottom in the proximal part of the duodenum increases by 2.68 times, and in the pars caudalis - by 2.46 times. The number of goblet cells in day-old chickens in the crypts of the proximal part is significantly greater than in the pars caudalis. The width of the muscle plate of the mucous membrane in the proximal and distal areas in chickens at all age periods differs slightly. Its greatest increase is in the pars cranialis by 36.33% and in the distal by 39.59%
ross 308, broiler chickens, duodenum, morphology, intestinal villus, intestinal crypt, muscle membrane
1. Egorov I. Belkovyy korm na osnove poslespirtovoy bardy v racione broylerov / I. Egorov, T. Egorova, L. Krivoruchko // Kombikorma. - 2019. - № 12. - S. 72-73. EDN: https://elibrary.ru/VMQTMX
2. Grozina A.A. Morfologicheskaya ocenka stenki kishechnika cyplyat krossa "KOBB 500" na fone primeneniya antibiotika i probiotika / A.A.Grozina, V.V, Pronin, M.S. Dyumin // RVZh - SHZh - 2014. - № 4. - S. 16-17. EDN: https://elibrary.ru/TBFGGH
3. Belyaeva N.P. Sezonnye adaptacii morfofunkcional'nyh harakteristik dvenadcatiperstnoy kishki ptic vseyadnoy troficheskoy specializacii / N.P. Belyaeva, T.S. Kubatbekov // Sostoyanie i perspektivy uvelicheniya proizvodstva vysokokachestvennoy produkcii sel'skogo hozyaystva: Materialy X Mezhdunarodnoy nauchno-prakticheskoy konferencii (02-04 iyunya 2022 goda). Novosibirsk, 2022. Izdatel'skiy centr Novosibirskogo gosudarstvennogo agrarnogo universiteta "Zolotoy kolos". - S. 19-23. EDN: https://elibrary.ru/JUEMRA
4. Izadi H., Arshami J., Golian A., Resa Raji M.: Effects of chicory root pouder on growth performance and histomorphometry of jejunum in broiler chicks.: Veterinary Research Forum. 2013;4(3)169-174.
5. Veremeeva S.A. Anatomo-gistologicheskaya harakteristika dvenadcatiperstnoy kishki broylerov pri vozdeystvii stress-faktora v zavisimosti ot pola / S.A. Veremeeva, S.V. Kozlova, E.P. Krasnolobova, K.A. Sidorova // Vestnik Michurinskogo gosudarstvennogo agrarnogo universiteta. - 2021. - № 3 (66). - S. 217-222. EDN: https://elibrary.ru/NEVKDD
6. Fisinin V.I. Pervye dni zhizni cyplyat: ot zaschity ot stressov k effektivnoy adaptacii / V.I. Fisinin, P. Suray // Pticevodstvo - 2012. - № 2. - S. 11-15. EDN: https://elibrary.ru/OWQNDL
7. Matveev O.A. Gistoarhitektonika zhelezistogo i myshechnogo zheludka cyplyat-broylerov krossa ROSS-308 v postinkubacionnom periode ontogeneza / O.A. Matveev, M.M. Zhambulov, I.V. Chekurov, P.L. Makarov // Izvestiya Orenburgskogo agrarnogo universiteta. - 2018. - № 4. - S. 237-241. EDN: https://elibrary.ru/UYPYTX
8. Matveev O.A. Gistoarhitektonika kishechnika cyplyat-broylerov v postinkubacionnom ontogeneze / O.A. Matveev, A.A. Torshkov // Izvestiya Orenburgskogo agrarnogo universiteta. - 2019. - № 5 - S. 188-191. EDN: https://elibrary.ru/BUVWKW
9. Cherepanova, N.G. Gistologiya kishechnoy stenki cyplyat-broylerov pri ispol'zovanii razlichnyh biodobavok / N.G. Cherepanova, E.A. Prosekova, E.V. Panina, V.P. Panov, A.E. Semak, M.V. Sidorova, A.A. Koncevova // Izvestiya Timiryazevskoy sel'skohozyaystvennoy akademii. - 2019. - № 1. - S. 98-112. EDN: https://elibrary.ru/WKPSDD
10. Hem A. Gistologiya: monografiya / A. Hem, D. Kormak. - M.: Mir, 1983. - T. 4. - S. 137-152.
