Beata GŁOWIŃSKA, Krzysztof MŁYNEK, Ewa SALOMOŃCZYK, Jolanta TKACZUK, Wojciech STYŚ

The effect of daily milk production on the milk composition and energy management indicators in Holstein–Friesian and Simmental cows

The present study investigated the effect of daily milk production on the content of crucial milk components, body condition,and the level of energy management parameters in the blood and milk in Holstein–Friesian (HF) and Simmental (SIM) cows. Withineach breed, the animals were divided into two groups: the HF-L group was HF cows with daily milk production of ≤31 kg and the HF-Hgroup was those with daily milk production of >31 kg. The SIM-L was SIM cows with daily milk production of ≤27 kg and the SIM-Hgroup was those with daily milk production of >27 kg. The intensity of reserve fat accumulation was assessed by using body conditionscoring. Samples of milk were taken every 30 days of lactation and the content of total protein, casein and κ-casein, fat, lactose, drymatter, and urea were determined. Blood samples were taken on days 10, 40, 70, 100 and 130 of lactation to determine the content ofglucose and beta-hydroxybutyrate. The obtained results suggest that, in spite of the lower milk production, the Simmental cows had themore favorable energetic homeostasis of the organism. The values of casein and κ-casein indicate better suitability of the raw materialobtained from Simmental cows for cheese processing. From a practical point of view, higher Holstein–Friesian cows’ average dailyyield and a relatively small difference in the content of the total protein compared to Simmental cows’ milk suggest its use primarily asconsumption milk.

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