Age dynamics of growth and interior features in heifers of Ukrainian black-and-white dairy breed
Journal Title: Біологія тварин - Year 2015, Vol 17, Issue 2
Abstract
Studies have been conducted in “Milk River” (Sokal department Lviv region) using heifers of Ukrainian black and white dairy cattle. The studied animals were characterized by high rates of live weight at all ages and at 18 months of age it was 414.1 kg. Absolute and average daily live weight of heifers was the greatest in the age period of 3–6 months and was 73.2 kg and 800.2 g, respectively. At all ages heifers were characterized by large linear dimensions of the body, deep and broad chest, well-developed rear of the body. With age heifers decreased leggy index and increased thoracic index. Stretch index increased to 15 months of age, and pelvis-chest index and bony index changing waves. General indices of body structure indicate the proportional and harmonious development of heifers at all ages. With age heifers content of total protein in serum increased, and glucose and reserve alkalinity decreased and from 3–18 months of age, these figures changed to 14.71 g/L (P<0.001), 0.75 mmol/l (P<0.01) and 3.72 vol % (P<0.001), respectively. The number of red blood cells, white blood cells and hemoglobin in the age aspect had wavy character. With age, heifers, an increase in bactericidal and lysozyme activity of serum and phagocytic activity of neutrophils. The 18-month-old animals compared to 3-month, these figures were higher at 10.82; 6.21 and 7.07 %, respectively, at P<0.001 in all cases. Overall natural resistance in heifers Ukrainian black and white dairy cattle according to age period ranged 54–60 points, which is considered a normal level.
Authors and Affiliations
M. I. Kuziv
Keywords
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