Zinc effect on cows mammary gland health | Uticaj cinka na zdravlje mlečne žlezde krava
2012
Davidov, I., Poljoprivredni fakultet, Novi Sad (Serbia) | Radinović, M., Poljoprivredni fakultet, Novi Sad (Serbia) | Erdeljan, M., Poljoprivredni fakultet, Novi Sad (Serbia) | Galfi, A.M., Poljoprivredni fakultet, Novi Sad (Serbia) | Boboš, S., Poljoprivredni fakultet, Novi Sad (Serbia) | Kovačević, Z., Poljoprivredni fakultet, Novi Sad (Serbia)
Zinc as an essential trace element necessary for the proper functioning of the mammary gland in cows. The most critical period for the maintenance of good health of the cows is periparturient period and early lactation period. During this period of realignment is performed metabolic and endocrine systems of cows, in order to ensure a successful transition from a state of high gravidity on high lactation. The study included 30 Holstein-Friesian cows, which were divided into two groups of 15 cows. All the cows blood samples were taken at the beginning of the experiment, ie. in the dry period. Cows control and experimental groups had a mean value of zinc in blood serum in physiological limits, but there are variations in the concentration of zinc in blood serum in the group. Experimental group during the study received zinc supplements in food of 240 mg / kg diet. Blood samples were again taken 150th days of lactation, and milk samples of cows control and experimental groups. Of the 15 cows of the control group, 3 were sent to commercial exploitation, and 15 cows from the experimental group 2 were sent to commercial exploitation. Excluded from cows from production, udder were taken for further histopathological examination. Statistical analysis of correlation test, there was a negative relationship between the concentration of zinc in blood serum and somatic cells in the milk of cows of the experimental groups, indicating that with increasing zinc concentration in the blood serum of a decline in somatic cells in the milk of cows. From the results it can be seen that the addition of zinc in feed cows during lactation may have a positive impact on the preservation of health of the mammary gland and milk production of high producing dairy cows.
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