Abstract
Abstract. Title of the paper: The impact of nutrition and non nutrition factors on milk urea concentration. III. A new milk urea model to indicate the dietary crude protein / energy balance in dairy cows The object of this study was to determine the impact of dietary crude protein / energy balance, stage of lactation, parity, milk protein yield, somatic cell count on milk urea concentration under the conditions of routine milk yield recording. From this data a model was created to predict the milk urea concentration for a single dairy cow or a feeding group. The relationship between dietary crude protein/energy balance, milk protein yield, stage of lactation, somatic cell count and milk urea concentration can be described by the following equation: first lactation period y = 156.7 + 42.52 * milk protein yield + 0.34 * day in milk -0.017 * somatic cell count second lactation period y = 186.2 + 43.23 * milk protein yield + 0.04 * day in milk - 0.019 * somatic cell count third lactation period y = 188.3 + 31.17 * milk protein yield + 0.06 * day in milk - 0.015 * somatic cell count The approximate confidence interval for a predicted milk urea content is ± 15 mg/l. If the analyzed milk urea concentration is greater than the predicted milk urea content (interval), this could indicate dietary crude protein excess. If the analyzed milk urea concentration is lower this might be due to a lack of dietary crude protein.
Highlights
Title of the paper: The impact of nutrition and non nutrition factors on milk urea concentration
If the analyzed milk urea concentration is lower this might be due to a lack of dietary crude protein
Dr JOACHIM SPILKE Martin-Luther-Universität Halle-Wittenberg Landwirtschaftliche Fakultät Arbeitsgruppe Biometrie und Agrarinformatik Ludwig-Wucherer-Straße 82-85 D-06108 Halle (Saale)
Summary
Title of the paper: The impact of nutrition and non nutrition factors on milk urea concentration. Aus der Diskussion der in den ersten zwei Mitteilungen dargestellten Untersuchungsergebnisse lässt sich schlussfolgern, dass der Harnstoffgehalt der Milch nicht nur durch die Rohproteinversorgung (Energie-Rohprotein-Verhältnis) beeinflusst wird, sondern auch durch verschiedene tierindividuelle Merkmale (Eiweißmenge, Laktationsstadium, Gehalt an somatischen Zellen). Schätzwerte und deren approximatives Konfidenzintervall für den Milchharnstoffgehalt [mg/l] in Abhängigkeit von Laktationstag, Eiweißmenge und einem GSZ von 200 Tsd./ ml im ersten Laktationsdrittel (Milk urea content and approximate confidence interval in relation to day in milk, milk protein yield and somatic cell count (200 IE3/ml) in the first lactation third). Mit steigender Eiweißmenge je Tier und Tag erhöht sich der Harnstoffgehalt, erreicht aber erst bei Leistungen von 1,2 kg Eiweiß auch Werte von über 250 mg/l, was auf Grund des fortgeschrittenen Laktationsstadiums eher einen theoretischen Charakter hat. Schätzwerte für den Milchharnstoffgehalt [mg/l] und das approximative Konfidenzintervall in Abhängigkeit von Laktationsdrittel, Eiweißmenge und einem GSZ von 200 Tsd./ml (Milk urea content and approximate confidence interval in relation to lactation third, milk protein yield and somatic cell count (200 IE3/ml))
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