Gelita Flex Digestibility trial (F208) with Mink ... - Kopenhagen Fur

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Gelita Flex
Digestibility trial (F208) with Mink (Mustela vison),
Report concerning digestibility of Gelita Flex produced and delivered by Gesellshaft Für
Tierernährung, Germany. The trial was ordered and paid by Gesellshaft Für Tierernährung, Germany.
The purpose of the trial was to establish the apparently mink digestibilities of crude protein, crude fat,
and amino acids in Gelita Flex.
Material and method
A samples of the Gelita Flex was received on the 3 rd of July 2003. Gelita Flex is defatted gelatine
hydrolysate.
The trial was conducted as a regression design, consisting of 5 groups of three animals each. Adult male
mink of the colour type Scanbrown were used. The diets (table 1) contained Gelita Flex equaling from
0% to 55% of the total dietary crude protein content and from 0% to 7% of the total dietary crude fat
content.
Table 1. Formula for diet 1 and 5 (% before addition of water)
Feed ingredients Group 1 Group 5
Gelita Flex 0.0 20.0
Cod filét 78.1 51.6
Soya oil 8.6 10.8
Maize starch 8.6 11.3
Glucose 1.0 1.3
Cellulose 3.0 4.0
Vitamin mix 0.4 0.5
Mineral mix 0.5 0.6
The trial consisted of a 7 days long preliminary period and a 4 days long faecal collection period. Diet
allowance was 300 kcal metabolizable energy (ME) per day the first 6 days, and 250 kcal ME the last 5
days.
The trial was conducted from the 4 th to the 15 th of August 2003.
Diets and faeces were analysed by Dansk Pelsdyr Foder A/S, Analyselaboratoriet.
1
Gelita Flex for Mink. Digestibility trial performed by Danish Fur Breeders Research Center

Results
Chemical composition
The chemical composition and digestibilities in Gelita Flex used in the trial is presented in table 2.
Table 2. Chemical composition and apparently digestibilities in Gelita Flex (Mean ± SEM)
Composition Digestibility SEM
Dry Matter, % 59.1
% of Dry Matter
Crude Ash
Crude Protein (N*6.25)
Crude Fat
Amino acids, % of CP
Alanine
Arginine
Aspartic acid
Cystine
Glutamic acid
Glycine
Histidine
Isoleucine
Leucine
Lysine
Methionine
Ornithine
Phenylalanine
Proline
Serine
Threonine
Tryptophan
Tyrosine
Valine
10.5
89.3
5.8
7.81
6.84
5.87
0.27
10.34
17.86
1.49
1.63
3.66
4.37
0.88
0.12
2.18
9.83
3.30
2.23
0.17
1.65
3.06
2
Gelita Flex for Mink. Digestibility trial performed by Danish Fur Breeders Research Center
-
87
71
92
96
58
19
89
89
83
90
91
93
86
-
86
91
87
81
59
91
90
-
0.8
14.3
Feed left overs and faeces consistency
Two animals was excluded from the data analysis because of low feed intake. The remaining animals
had varying feed left overs. The reduced feed intake was not related to the inclusion of Gelita Flex, but
caused by high ambient temperature.
Consistency of faeces was optimal for all animals.
Digestibility
In Gelita Flex the apparently digestibility of crude protein was 87%, while the true digestibility was
calculated to 91%.
At the maximum inclusion of Gelita Flex, fat from Gelita Flex only made up 7% of the total dietary fat
content as a consequence of the low content of fat in Gelita Flex. Hence, the statistically confidence of
the measured digestibility of crude fat (71%) is low (high SEM).
The apparently digestibilities of the amino acids is presented in table 2. Like for the fat digestibility, the
high SEM on the measured digestibility of Cystine og Tryptophan is a consequence of the relatively low
content of these amino acids in Gelita Flex.
*********
06/10/03
Carsten Hejlesen
0.6
0.5
1.6
14.0
0.9
0.4
1.5
1.4
1.1
0.8
1.3
-
1.6
0.5
1.2
2.2
10.2
1.5
1.4