Abstract
The experiment was carried out on a mini farm of Holstein-Friesian cows with 30 animals, aged between 3 and 5 years and the zinc level in serum was measured. The analyses of the blood samples indicated a variation in the concentration of zinc in serum. In 11 out of 15 tested cows (73.33%) the zinc values in serum were below the physiological values for high-milking cows. In the experimental group different thickness of the keratin layer was detected in the teat canal. The statistical analysis showed a positive correlation between the concentration of zinc in cow serum and the thickness of teat canal keratin layer. This indicates that the cows with low values of zinc have thin keratin layer of the teat canal.
Highlights
Visoko mlečne krave gube znatne količine minerala u vreme laktacionog perioda, tako da im se mora obezbediti dovoljna količina mineralnih materija u obroku
Takođe ima uticaja na smanjenje broja somatskih ćelija u mleku krava (Kellogg et al, 2004)
Korišćeni su standardi za cink-AccuTrace Reference Standard, AA70N-1, Lot B9025027
Summary
ODNOS DEBLJINE KERATINSKOG SLOJA SISNOG KANALA VIMENA KRAVA I KONCENTRACIJE CINKA U KRVNOM SERUMU'*. Ivana Davidov*2, Miodrag Radinović[1], Mihajlo Erdeljan[1], Zorana Kovačević[1], Dragica Stojanović[2]. 'Departman za veterinarsku medicinu, Poljoprivredni fakultet, Novi Sađ 2Naučni institut za veterinarstvo „Novi Sad“, Novi Sađ
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