Technical quality of dog food and salmon feed containing different bacterial protein sources and processed by different extrusion conditions

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• 作者：Margareth Ø ; verl ; Odd Helge Romarheim ; Ø ; ystein Ahlstrø ; m ; Trond Storebakken ; Anders Skrede
• 关键词：Bacterial protein meal ; Homogenate ; Dog ; Fish ; Feed processing
• 刊名：Animal Feed Science and Technology
• 出版年：2007
• 出版时间：1 March 2007
• 年：2007
• 卷：134
• 期：1-2
• 页码：124-139
• 全文大小：167 K

文摘

The effect of basic bacterial protein meal (BPM) and bacterial protein meal homogenate (HOM) on length, expansion, density, sinking rate, fat leakage, durability, and breaking force of extruded dog food and salmon feed exposed to mild and moderate processing conditions was evaluated. The treatment consisted of a control diet and four test diets where high-quality (low temperature dried; LT) fish meal was partly replaced with either 25 or 50 g BPM or HOM kg⁻¹. The differences in processing characteristics were obtained by a combination of conditioner and extruder adjustments. Fat was added to the extruded diets by vacuum coating. In the dog diets, the inclusion of BPM and HOM resulted in shorter pellets with increased diametric expansion, and reduced dust percentage, sinking rate and breaking force, with the effect being in general greatest with the highest concentration. In general, moderate feed processing resulted in increased pellet length and expansion while sinking rate and fat leakage decreased in both the BPM and HOM diets. Neither BPM nor HOM affected fat leakage, but fat leakage decreased by moderate processing. In the salmon diets, dietary BPM and HOM increased density and breaking force, but decreased durability and had no effect on sinking rate or fat leakage of the extruded salmon pellets. A significant interaction between feed processing and bacterial protein source was found for pellet length and diameter. Moderate feed processing increased pellet length in the BPM diets but reduced pellet length and increased pellet expansion in the HOM diet. Moderate processing decreased durability and sinking rate of the pellets. Coefficients of total tract apparent digestibility (CTTAD) of the control, 50 g kg⁻¹ BPM and 50 g kg⁻¹ HOM dog diets exposed to mild and moderate feed processing were determined in mink. There was no significant effects of type of diet or feed processing on CTTAD of major dietary components. The results demonstrate that low amounts of BPM and HOM influenced the technical quality of extruded diets for dogs and salmon. The effect of BPM and HOM was different in dog food with higher starch content compared to the salmon feed with lower starch content, and was dependent on extrusion conditions.