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abstract-296
As regards the increase in weight it seems to be reduced both at constantly low and reduced protein levels,
compared to the normal protein level.
The sensorial judgement of pelts implies that males are more sensitive than females in respect of dietary
changes.
Different planes of energy supply prior to the breeding season
- Effect on blood metabolites in female mink (Mustela vison)
Rikke Fink 1) , Anne-Helene Tauson 1) and Mats Forsberg 2)
1) Department of Animal Science and Animal Health, The Royal Veterinary and Agricultural University,
Bülowsvej 17, DK-1870 Frederiksberg C, Denmark.
2) Department of Clinical Chemistry, Swedish University of Agricultural Sciences,
Box 7038, S-75007 Uppsala, Sweden.
Abstract
Metabolic blood profiles were studied in a total of 30 female mink (Mustela vison) at different planes of
energy supply prior to the breeding season in a control, a flushed and a negative energy balance group.
The experiment, which was divided into six one-week periods, started on
6 February and continued until 20 March. Flushing was performed by restricted feeding in periods 2 and 3
and re-feeding in periods 4 and 5. The animals were weighed weekly and blood sampled at the end of
periods 1, 2 and 4, the two later occasions corresponding to one week after changes in the feed supply of
the flushed group took place. Plasma was analysed for total triiodothyronine, total thyroxine, insulin and
insulin-like growth factor-1. Generally, the responses to the experimental treatment clearly reflected the
energy supply of the treatment groups. Within the flushed group differences in animal live weights and
blood metabolites were significant between periods, while these variables remained almost constant in the
control group. Differences between the control and the flushed group were however, non-significant when
considered over the total experimental period, thus confirming that flushing is an acute response, inducing
a rapid fluctuation in energy status, hormone and metabolite concentrations of the animal despite absence
of major changes in the total nutritional status and body conditions. However, the responses in the group
in negative energy balance were typical chronic modulation of the reproductive axis and associated with
considerable shifts in live weight and body condition, leading the differences between treatment groups to
be significantly.
Utvikling i blårevens evne til å fordøye næringsstoffer.
Sammenligning av viltfanget fjellrev fra Svalbard med farmrev
Øystein Ahlstrøm 1 , Eva Fuglei 2 og Liv Torunn Mydland 1
1 Norges landbrukshøgskole, Institutt for husdyrfag, pb. 5025, 1432 Ås
2 Norsk Polarinstitutt, Storgt. 25a, 9008 Tromsø
Sammendrag
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