Koncentracije kalcijuma, neorganskog fosfora i magnezijuma u krvnom serumu krava tokom tranzicionog perioda i pune laktacije / Blood serum levels of calcium, inorganic phosphorus and magnesium in transition and peak lactation cows
2016
Jašović, Boban (Poljoprivredni fakultet, Lešak (Srbija)) | Đoković, Radojica (Agronomski fakultet, Čačak (Srbija)) | Kurćubić, Vladimir (Agronomski fakultet, Čačak (Srbija)) | Petrović, Milun D. (Agronomski fakultet, Čačak (Srbija)) | Dosković, Vladimir (Agronomski fakultet, Čačak (Srbija)) | Petrović, Miloš (Agronomski fakultet, Čačak (Srbija)) | Rakonjac, Simeon (Agronomski fakultet, Čačak (Srbija))
The objective of this study was to determine blood levels of macronutrients in Simmental cows (n=45) during the transition period and peak lactation. The experimental cows were assigned to three groups: Group A (n=15) including clinically healthy late gestation cows, Group B (n=15) comprising clinically healthy cows in the puerperium, and Group C (n=15) made up of clinically healthy peak lactation cows. Blood samples were collected from all experimental cows. Blood serum samples were analysed for calcium, magnesium and inorganic phosphorus levels using spectrophotometry. Blood levels of macronutrients were within the physiological range in all experimental cows. Blood concentrations of calcium, magnesium and inorganic phosphorus in cows in the puerperium were statistically significantly lower (p<0.05) compared with those in dairy cows during late gestation and peak lactation, which may indicate the increased use of these macronutrients in early lactation for the mammary gland. The results show that the homeostasis of the macronutrients tested in the blood of transition and peak lactation dairy cows was maintained, suggesting their adequate supply from alimentary sources.
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