Donadelli Renan Antunes, Dogan Hulya, Aldrich Charles Gregory
Department of Grain Science and Industry, Kansas State University, Manhattan, KS.
Transl Anim Sci. 2020 Oct 8;4(4):txaa185. doi: 10.1093/tas/txaa185. eCollection 2020 Oct.
Cellulose and beet pulp have been commonly used in the pet food industry to increase the dietary fiber content of cat foods. However, pet food companies seek alternatives to these so-called byproducts. Miscanthus grass is grown for its fiber content and may serve as an alternative to traditional fibrous ingredients. The objectives of this study were to determine the effects of fiber sources on extrusion processing and kibble structure of cat foods. Three replicate batches of a complete and balanced foods for adult cats at maintenance each containing 10% of Miscanthus grass, cellulose, or beet pulp was mixed and kibbles were produced on a single-screw extruder. Feed rate, preconditioner water and steam, extruder screw speed, extruder water and steam addition, and knife speed were adjusted to achieve a wet bulk density of 330 g/L. After extrusion, kibbles were dried at 115.5 ºC to less than 10% moisture. Dried kibbles were coated with chicken fat and flavor enhancer. No effects due to fiber source were reported for extrusion parameters or kibble measurements ( > 0.05) with the exception of compression energy, wherein kibbles produced with cellulose required more energy to compress than those containing beet pulp (6,917 N mm vs. 3,591 N mm, respectively). In conclusion, tested fiber sources had no impact on extrusion parameters and most kibble characteristics. Kibbles containing cellulose required more energy to compress than kibbles containing beet pulp. Miscanthus grass could be used as an alternative to traditional fiber sources used to produce cat foods.
纤维素和甜菜粕在宠物食品行业中一直被普遍用于提高猫粮的膳食纤维含量。然而，宠物食品公司正在寻找这些所谓副产品的替代品。芒草因其纤维含量而被种植，可作为传统纤维成分的替代品。本研究的目的是确定纤维来源对猫粮挤压加工和颗粒结构的影响。将三批重复的成年维持期全价平衡猫粮混合，每批猫粮分别含有10%的芒草、纤维素或甜菜粕，然后在单螺杆挤压机上生产颗粒。调整进料速度、调质器水和蒸汽、挤压机螺杆速度、挤压机水和蒸汽添加量以及切割速度，以达到330 g/L的湿容重。挤压后，颗粒在115.5℃下干燥至水分含量低于10%。干燥后的颗粒涂上鸡脂肪和风味增强剂。除了压缩能量外，未发现纤维来源对挤压参数或颗粒测量有影响（P>0.05），其中用纤维素生产的颗粒比含有甜菜粕的颗粒需要更多的能量来压缩（分别为6917 N·mm和3591 N·mm）。总之，测试的纤维来源对挤压参数和大多数颗粒特性没有影响。含有纤维素的颗粒比含有甜菜粕的颗粒需要更多的能量来压缩。芒草可作为生产猫粮所用传统纤维来源的替代品。
