University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Matthias Schaunitzer
(2011):
Vergleich von geschütztem mit ungeschütztem Rapsextraktionsschrot im Leistungskraftfutter aur Milchleistungsparameter von Milchkühen.
Master / Diploma Thesis - Institut für Tierernährung, Tierische Lebensmittel und Ernährungsphysiologie (TTE),
BOKU-Universität für Bodenkultur,
pp 65.
UB BOKU
obvsg
FullText
- Abstract:
- The aim of the present study was to examine the effect of a protected protein source in high-yielding dairy cows on energy-corrected milk yield (ECM) and on the parameters milk fat, milk protein and urea content. The study took place simultaneously on two farms for 5 weeks. It included two experimental groups of animals per farm, with 8 or 10 cows in their first lactation period and cows with multiple lactations. The trial ration of the dairy cows consisted of grass silage, corn silage, complementary feed, minerals and salt. The conventional rapeseed meal was replaced in the dairy feed of the experimental group by protected rapeseed meal. The basic ration could be taken by the animals ad libitum at the feeder. The dairy feed was individually given to the cows by automatic feeders, adjusted by their individual milk yield. No statistically significant differences were found between the groups for the parameter energy-corrected milk yield. The level of energy-corrected milk was 29.63 kg within the control group and 29.84 kg within the experimental group and was therefore almost completely identical. The milk fat content did not differ either with 4.39% and accordingly 4.33%. The milk protein content of 3.45% in the experimental group was 1.5% higher than in the control group (3.40%), however the difference was only significant at a time. Also for the urea level no differences were found. For the experimental group, the content was 25.03 mg/100ml milk with only a slightly lower level for the control group (24.72 mg/100ml). Apart from the milk protein content, no significant differences could be detected in any parameters. The use of protected rapeseed meal increases the milk protein content, but otherwise brought no added value within the tested herds.
- Beurteilende(r): Windisch Wilhelm Matthias
- 1.Mitwirkender: Schedle Karl