МОРФОМЕТРИЧНІ ПОКАЗНИКИ РОСТУ СТІНКИ СТРАВОХОДУ КУРЕЙ У ПОСТНАТАЛЬНОМУ ПЕРІОДІ ОНТОГЕНЕЗУ.

Intensive development of poultry farming dictates the necessity of creating scientifically substantiated norms of feeding and keeping of poultry, their productivity depends on the morphofunctional state of all organs and systems. Consequently, studies of morphological features of the digestive system of birds and the mechanisms of their regulation become greatly important. The object of studies was the esophagus of chickens cross Chever 579 aged 1, 30, 60, 90,120, 150,180, 210, 240, 270 and 300 days and 1, 2 and 3 years. During the work, conventional classical methods of microscopic research were used. The selected material was fixed in 10% neutral formalin solution and poured into paraffin according to the generally accepted method. Histologic sections were stained with hematoxylin and eosin. Digital indexes of results of the research were processed statistically using personal computer with the Excel program. The morphogenesis of the esophagus of chickens in the age aspect is manifested by changes in the morphometric parameters of its wall thickness and the occupied area of the membranes. The wall thickness increases unevenly up to 300 days old chickens (between folds 1360,08 ± 30,31 and in the fold area 2492,88 ± 41,34 mkm - cranial and respectively 1374,75 ± 27,56 and 2496,54 ± 52,36 mkm - caudal parts). The area of the esophageal mucous membrane increases to 180- days old chickens (54,10 ± 0,81 - cranial and 54,91 ± 0,74% - the caudal parts), and the muscularis and adventitia (serosa) decrease (respectively 42,17 ± 0,89, 3,73 ± 0,38 - cranial and 42,73 ± 0,92, 2,36 ± 0,35% - caudal parts). In older birds, the wall thickness and area of the esophageal membranes remain almost unchanged. [ABSTRACT FROM AUTHOR]