University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Markus Grohmann
(2012):
Distribution of infection with gastro-intestinal nematodes in different groups of dairy goats in Switzerland and its influence on milk production.
Master / Diploma Thesis - Institut für Nutztierwissenschaften (NUWI),
BOKU-Universität für Bodenkultur,
pp 60.
UB BOKU
obvsg
FullText
- Abstract:
- The aim of this field study was to investigate interactions between gastro-intestinal-nematode (GIN) infection and milk performance in order to prepare ground for breeding GIN resistant dairy goats as well as to identify groups with higher susceptibility to GIN infections in order to reduce the number of anthelmintic treatments. Influence of GIN infections on milk performance (milk yield and milk components) and susceptibility for GIN infection according to the level of milk yield and the age was assessed. Resistance of GIN against anthelmintics used in the study and influence of farm factors on GIN infection were also investigated. The study was conducted in Switzerland with Saanen and Alpine dairy goats. On the participating farms farm characteristics and fecal egg count (FEC) were recorded. On some of these farms milk yield and fecal egg count reduction (FECR) were also recorded. Furthermore genera composition of GIN was assessed on each farm. Haemonchus contortus was the dominating nematode genera, whereas a shift towards less H. contortus and more Trichostrongylus sp. in autumn could be observed. Fecal egg count reduction test (FECRT) showed low success of deworming on all farms. Only in one case FECR was close to 100%. A clear negative influence of GIN infection on milk yield could not be found as results for change in milk yield after deworming were equivocal. There was a tendency of higher GIN infections in high producing goats but differences were not significant. Multiparous goats showed significant higher FEC than primiparous. However, time of sampling and nutrient supply seem to have a considerable influence on intensity of GIN infection and its physiological impact under field conditions.
- Beurteilende(r): Winckler Christoph