Abstract
The study was conducted on 60 heads of black-and-white cattle of six age groups: 1 day, 30 days, 3 months, 6 months, 18 months and cows 4-5 years old. Injection, morphological and morphometric methods were used. It was found that the hemomicrocirculatory bed of the honeycomb bag has typical links. The diameter of arterioles in the first-order ridges increases by 30.5% during the study period, but significant changes are observed only between the age groups of 3 months – 6 months, 6 months-18 months, these differences are 8.3% and 10.7%, respectively. In the capillary link, significant changes are observed between the age groups of 6 months-18 months and 18 months-4-5 years, which is 10.0% and 24.8%, respectively. In the link of postcapillary venules, the diameter of the vessels during the study period increases by 16.9%. In the link of collecting venules, significant changes (p≤0.01) in the diameter of vessels were observed between the age groups of 3-6 months and 6-18 months, which is 22.9% and 8.2%, respectively. In lactating cows (4-5 years old), in addition to wide capillaries, we found postcapillary venules with a diameter of 14.80 to 27.20 µ in the papillae of the lamina mucosa propria.
Highlights
The uniqueness of ruminants is in their ability to convert roughages into products with high nutritional value
The data obtained during the study of the hemomicrocirculatory bed of the honeycomb bag wall indicated its typical structure and age-related features
The diameter of arterioles of the first-order ridges increases by 30.5%, but significant changes are observed only between the age groups of 3 months – 6 months, 6 months-18 months, and these differences are 8.3% and 10.7%, respectively
Summary
The uniqueness of ruminants is in their ability to convert roughages into products with high nutritional value. The use of industrial technologies in dairy farming involves the thorough grinding of feeds, that helps to improve the efficiency of digestion, but affects the relief of the mucous membranes of the pre-ventricles, especially the honeycomb bag that performs the sorting function [7,8,9]. The sources of blood supply in the multicameral stomach and the blood supply of the chambers are described in a large number of ruminants [15,16], and the relationship between the microcirculatory bed of the lamina mucosa propria and the deep layers of the pre-ventricular epithelium is abundant in the papillae of the rumen, honeycomb bag and omasum [1]. The study of age-related morphometric features of the microcirculatory bed has become the aim of our research
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