REQUIREMENTS FOR THE UDDER OF HOLSTEINIZED TYPES OF COWS
The study of morphological and functional features of the udder of new cross-breeds of Aulie-Ata and Holstein cattle has revealed that new animal genotypes have quite suitable quality and form of udder meeting the requirements of contemporary dairy farming industry. The ratio of milk yields in udder quarters to milk ejection rate is an important trait in selective breeding of animals. It has been found that milk yield and cow milk productivity also depend on the development of udder glandular tissue. We have calculated the correlation coefficient of milk yield and udder collapse; it makes +0.726 in Aulie-Ata breed, and +0.813 in Aulie-Ata and Holstein crosses. Close relation of udder score and cow milk productivity has been revealed. The correlation coefficient of these traits in Aulie-Ata cows made +0.449; in Aulie-Ata and Holstein crosses it made +0.516. The nominal distance between the tips of front teats is 15-18 cm, rear teats - more than 6-10 cm, and between front and rear teats - 8-12 cm. The direction of all teats should be vertically straight down. The new genotype of Aulie-Ata cows features better development of all udder indices inherent to a dairy breed with strong conformation. Udder size increases with milk yield increase. The analysis of udder measurements of the Aulie-Ata and Holstein genotype shows that udder width, length and girth approach to those of Holstein-Friesian cattle in all lactations.