Periódicos Brasileiros em Medicina Veterinária e Zootecnia

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Zinc effect on milk somatic cell count in dairy cows

Davidov, IvanaodragiodragiodragErdeljan, MihajloJuraki, eljkaKovaevi, Zorana

Background: The cows requirement of zinc must be provided in the diet. The contents vary between different feedstuffs, and can be negatively influenced by factors like soil type, harvest, storage conditions. Also vary due to stage of lactation and health status of cow. Therefore, extra supplementation of zinc is sometimes warranted. Adequate zinc intake is particularly important during the late dry period and the early stages of lactation in order to prevent diseases around parturition. The aim of this study was to measure the concentrations of zinc in blood samples taken from dairy cows in different state of lactation and comparing with somatic cell count in cows milk.Materials, Methods & Results: A total of 45 Holstain cows were divided on days of milking into 3 groups of 15 cows (group A, B and C). All cows were stabling with dry straw for bedding and with ad libitum access to potable water, and feed by total mixed ration. Blood samples were taken after the morning milking from the caudal vein by applying the principles of asepsis and antisepsis. Blood samples were taken in vacutainer tubes with added anticoagulant K3E in quantities of 0.072 mL. Milk samples were taken during morning milking. The whole milk samples were taken with milk meter for somatic cell count. When quarter milk samples were taken the teat ends were disinfected. After analyzing the results, blood me

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