Nitrogen and energy balance in growing mink (Mustela vison) fed different levels of bacterial protein meal produced with natural gas
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The objective of this study was to estimate the effect of increasing the dietary content of bacterial protein meal (BPM) on energy and protein metabolism in growing mink kits. Sixteen male mink kits of the standard brown genotype were randomly fed one of four diets: A control (Diet III) and 60% (Diet IV) of the digested nitrogen (DN) was replaced with BPM. Nitrogen balance and respiration experiments (indirect calorimetry) were carried out when the animals were approximately 9.5, 14.5, 17.5, 23.5 and 28.5 weeks of age. The apparent digestibility of crude protein and energy decreased significantly with increasing dietary BPM. The retained nitrogen was 0.45, 0.54, 0.52 and 0.40 g/kg0,75 on Diets I, II, III and IV, respectively, the observed differences between diets being non-significant (p=0.06). Heat production (HE) was between 645 and 665 kJ/kg0.75 on all diets (p=0.78). retained energy (RE) was approximately 150-160 kJ/kg0.75 on Diets I to III, whereas it was - 11 kJ/kg0.75 on Diet IV, the differences being significant (p<0.001). A lower feed intake and apparent digestibility of energy caused the negative RE on Diet IV. The amount of HE from oxidation of protein decreased from 32.7% on Diet I to 26.6% on Diet IV, and oxidation of fat increased from 53.8% on Diet I to 63.5% Diet IV. In conclusion, protein and energy metabolism remained unaffected when up to 40% of DN was derived from BPM.
|Journal||Archives of Animal Nutrition|
|Number of pages||18|
|Publication status||Published - 2005|
- Former LIFE faculty - Mink, bacterial protein, protein metabolism, energy metabolism