MORPHOMETRIC PARAMETERS GROWTH AND DEVELOPMENT OF CLOACAL BURSA OF TURKEYS IN POSTNATAL ONTOGENESIS INITIAL STAGE

A.V. Kostyuk

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National University of Life and Environmental Sciences of Ukraine, st. Polkovnik Potekhin, 16, Building 12, Kyiv, 03041, Ukraine

Investigation of growth and development peculiarities of different organs in animals, including birds, is one of the urgent problems of modern morphology. Cloacal bursa refers to the central organs of hematopoiesis and immunopoiesis in birds. Its growth and development is relatively well studied in domestic chickens, ducks, geese and quail. From the known literature data of cloacal bursa in turkeys are incomplete and fragmented. This paper presents the studies of the dynamics of growth and development of the cloacal bursa in turkeys from the day of hatching to 35-day of age. It was established that the cloacal bursa actively grows and develops within the first 35 days of life in turkeys. Its mean weight during this period increased 17 times. The relative weight of the bursa is increased to 1421 days. In older turkeys it decreases. In postnatal ontogenesis initial stage of turkeys between age and mean weight of cloacal bursa there is a linearapproximation r=0.977 (p≤0.05), R2=0.991, and between age and mean weight of the body exponential (R2=0.974). Indexes of amount of lobules in bursa and theirs size is well correlated with indexes of age-related changes in the mean weight of the body. Increasing the number of lobules with the change of the mean weight of cloacal bursa is best described by the logarithmic approximation (R2=0.825), and their size by linear approximation r=0.989 (p≤0.05), R2=0.978. Indexes of amount of lobules in bursa and theirs size objectively characterize functional changes in cloacal bursa and confirm the fact that the increase of the bursa mean weight during the first 35 days of life occur due to quantitative and qualitative changes in its lobules.

Keywords: CLOACAL BURSA, TURKEY, GROWTH, DEVELOPMENT, MEAN WEIGHT, RELATIVE WEIGHT, MORPHOMETRIC PARAMETERS, LOBULES, POSTNATAL ONTOGENESIS

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