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首页> 外文期刊>Turkish Journal of Veterinary and Animal Sciences >The effect of daily milk production on the milk composition and energy management indicators in Holstein?Friesian and Simmental cows
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The effect of daily milk production on the milk composition and energy management indicators in Holstein?Friesian and Simmental cows

机译：日产奶对荷斯坦奶牛和西门塔尔牛的牛奶组成和能量管理指标的影响

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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. Within each 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-H group 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-H group was those with daily milk production of 27 kg. The intensity of reserve fat accumulation was assessed by using body condition scoring. Samples of milk were taken every 30 days of lactation and the content of total protein, casein and ?-casein, fat, lactose, dry matter, and urea were determined. Blood samples were taken on days 10, 40, 70, 100 and 130 of lactation to determine the content of glucose and beta-hydroxybutyrate. The obtained results suggest that, in spite of the lower milk production, the Simmental cows had the more favorable energetic homeostasis of the organism. The values of casein and κ-casein indicate better suitability of the raw material obtained from Simmental cows for cheese processing. From a practical point of view, higher Holstein?Friesian cows? average daily yield and a relatively small difference in the content of the total protein compared to Simmental cows? milk suggest its use primarily as consumption milk.
机译：本研究调查了荷斯坦奶牛（HF）和西门塔尔（SIM）奶牛的每日牛奶产量对关键牛奶成分含量，身体状况以及血液和牛奶中能量管理参数水平的影响。在每个品种中，将动物分为两组：HF-L组是日产奶量≤31kg的HF母牛，HF-H组是日产奶量> 31 kg的那些。 SIM-L是每日产奶量≤27kg的SIM奶牛，SIM-H组是每日产奶量> 27 kg的那些奶牛。通过使用身体状况评分来评估储备脂肪积累的强度。每隔30天泌乳一次，采集牛奶样品，测定总蛋白质，酪蛋白和β-酪蛋白，脂肪，乳糖，干物质和尿素的含量。在哺乳期的第10、40、70、100和130天采集血样，以确定葡萄糖和β-羟基丁酸酯的含量。获得的结果表明，尽管牛奶产量较低，西门塔尔牛的有机体能量稳态却更为有利。酪蛋白和κ-酪蛋白的值表明从西门塔尔牛获得的原料更适合奶酪加工。从实用的角度来看，荷斯坦奶牛，弗里斯兰奶牛更高？与西门塔尔牛相比，平均日产量和总蛋白质含量的差异相对较小？牛奶建议主要用作食用牛奶。

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