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The study group consisted of 60 Holstein-Friesian cattle from farms situated in the central part of the Lublin region in Poland. The cows were kept in a tethered system and fed a TMR or a PMR. It was found that the animals had reduced concentrations of serum macroelements in the puerperal period. Therefore, the amount of a prophylactic mineral additive was increased by 50%. The study was conducted...
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