Journal cover Journal topic
Archives Animal Breeding Archiv Tierzucht
Journal topic

Journal metrics

IF value: 0.991
IF0.991
IF 5-year value: 1.217
IF 5-year
1.217
CiteScore value: 2.0
CiteScore
2.0
SNIP value: 1.055
SNIP1.055
IPP value: 1.27
IPP1.27
SJR value: 0.425
SJR0.425
Scimago H <br class='widget-line-break'>index value: 28
Scimago H
index
28
h5-index value: 13
h5-index13
Supported by
Logo Leibniz Institute for Farm Animal Biology Logo Leibniz Association
Volume 44, issue 5
Arch. Anim. Breed., 44, 505–520, 2001
https://doi.org/10.5194/aab-44-505-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.
Arch. Anim. Breed., 44, 505–520, 2001
https://doi.org/10.5194/aab-44-505-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

  10 Oct 2001

10 Oct 2001

Fütterungs- und nicht fütterungsbedingte Einflüsse auf den Milchhamstoffgehalt von Milchkühen – 2. Mitteilung: Nicht fütterungsbedingte Einflussfaktoren auf den Milchhamstoffgehalt von Milchkühen

W. Richardt1, H. Jeroch2, and J. Spilke3 W. Richardt et al.
  • 1Sächsischer Landeskontrollverband e. V., August-Bebel-Straße 6, 09577 Lichtenwalde, Germany
  • 2Martin-Luther-Universität Halle-Wittenberg, Landwirtschaftliche Fakultät Institut für Ernährungswissenschaften, 06108 Halle (Saale), Germany
  • 3Martin-Luther-Universität Halle-Wittenberg, Landwirtschaftliche Fakultät Arbeitsgruppe Biometrie und Agrarinformatik, Ludwig-Wucherer-Straße 82-85, 06108 Halle (Saale), Germanhy

Abstract. Title of the paper: The impact of nutrition and non nutrition factors on milk urea concentration. II. The impact of non nutrition factors on milk urea concentration
The object of this study was to determine the impact of non nutrition factors stage of lactation, parity, milk protein yield, somatic cell count, season and herd on milk urea concentration. For parity one to fife 239, 242, 238, 235 and 237 mg urea/l milk was calculated using least-squares-means. Parity has a Statistical significant but small influence on the milk urea concentration. There was a strong positive relationship between the stage of lactation (day in milk) and milk urea concentration. The regression coefficients for day in milk within the three lactation periods were 0.34, 0.04 and 0.06. This means that the milk urea concentration increases by about 10 mg/1 over 30 days in the first lactation period. The fixed effects for first and second lactation period versus third lactation period were −31.6 and −2.1. Protein yield has a significantly positive influence on milk urea concentration. The regression coefficients for milk protein yield within the three lactation periods were 42.5, 43.2 and 31.2. This means that the milk urea concentration would increase by about 4 mg/l in first lactation period if the milk protein yield increased by 0.1 kg/day. The effect of somatic cell count on milk urea was significantly negative. The regression coefficients for somatic cell count within the three lactation period were −0.017, −0.019 and −0.015. This means that the milk urea concentration will decrease by 1.7 mg/l in first lactation period if the somatic cell count increases by IE5/ml. 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 an equation (third paper).

Download
Citation