NUTRITION OF DAIRY COWS IN SUMMER AND NITROGEN EXCRETION

Authors

  • Marija RAJČEVIČ Ulica bratov Učakar 6, Ljubljana, Slovenia
  • Jasna M. A. STEKAR Univ. of Ljubljana, Biotechnical Fac., Zootechnical Dept., Domžale, Slovenia
  • J. ŽLINDRA M-Kmetijsko gospodarstvo Kočevje, Kočevje, Slovenija
  • J. LEVSTEK M-Kmetijsko gospodarstvo Kočevje, Kočevje, Slovenija

DOI:

https://doi.org/10.14720/aas.1998.72.1.17070

Keywords:

cattle, cows, dairy cows, animal nutrition, summer nutrition, nitrogen, excrements

Abstract

Nutrition and production of 200 Friesian cows, which produced 24 kg milk a day, were monitored during five summer months. In September, the amount of total non-protein and ammonia nitrogen were determined in faeces, which were taken from ten cows' recta, and in slurry. A model of regression equations, which were introduced by Kirschgessner et al. (1993), was used to estimate daily amount of excreted nitrogen depending on few parameters. Cows excreted on average 301 g nitrogen a day depending on average consumed dry matter, depending on average consumed nitrogen 341 g, and depending on daily amount of milk 271 g. Faeces contained 34.04 ± 1.69 g total, 6.36 ± 0.76 g non-protein and 2.07 ± 0.33 g ammonia nitrogen, slurry contained 96.77 g total, 72.22 g non-protein and 57.15 g ammonia nitrogen, all per kg of dry matter. Protein surpluses in a ration reflected in more excreted nitrogen by urine while only in traces by faeces.

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Published

15. 12. 1998

Issue

Section

Original Scientific Article

How to Cite

RAJČEVIČ, M., STEKAR, J. M. A., ŽLINDRA, J., & LEVSTEK, J. (1998). NUTRITION OF DAIRY COWS IN SUMMER AND NITROGEN EXCRETION. Acta Agriculturae Slovenica, 72(1), 43–49. https://doi.org/10.14720/aas.1998.72.1.17070

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