Sezerotto Pamela Prestes, Fredrich Dourado Pinto Caroline, da Silva Ariane Miranda, Paiva Francisco Joyce Cristina, Bortolo Marcelino, Marx Fábio Ritter, Vasconcellos Ricardo de Souza, Trevizan Luciano
Animal Science Departament, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
South America Jr. R&D Scientist, Nutrisurance Division, Kemin Industries, Inc., Vargeão, Brazil.
J Anim Sci. 2025 Jan 4;103. doi: 10.1093/jas/skaf173.
Feeding companion cats with diets based on hydrolyzed proteins may improve palatability and digestibility due to the presence of peptides and free amino acids. Furthermore, using highly digestible protein sources can decrease the undigested protein content that reaches the hindgut, thereby modifying fermentation end metabolites. This study aimed to evaluate the effects of replacing poultry byproduct meal (PBM), as the most traditional protein source for cats, with hydrolyzed chicken liver (HCL) added at 24%, 32%, and 40% of crude protein (CP) in the diet, replacing carbohydrates from brewers rice. The combination between 2 ingredients and 3 inclusions of CP permitted to test 6 extruded diets: PBM24, PBM32, PBM40; HCL24, HCL32, and HCL40. Thirty-six adult cats were arranged in a complete randomized block design to evaluate the apparent total tract digestibility (ATTD) of nutrients and energy, fermentative end products, and palatability. Crude protein ATTD increased at higher protein concentrations (P = 0.036). Fat ATTD was lower in cats fed HCL40 (P = 0.046). Carbohydrate digestibility decreased with high protein intake (P < 0.05) as a result of replacing carbohydrates with protein in the experimental diets. Gross energy ATTD was lower in cats fed HCL32 (P = 0.027). Similarly, cats fed HCL and HCL32 had lower metabolizable energy (P < 0.05) when compared to PBM. Fecal dry matter (P = 0.005) and fecal scores (P = 0.014) were lower with the inclusion of HCL (P < 0.05). Also, cats fed HCL32 had looser stools (2.61 out of a 0 to 5 score; P = 0.025), but within the acceptable range, compared to the other diets. Urinary pH increased with HCL inclusion and at higher protein concentrations (P < 0.05). Fecal acetate, propionate, valerate, total short-chain fatty acids (SCFA), isovalerate, and total volatile fatty acids (VFA) were higher in cats fed HCL compared to those fed PBM (P < 0.05). In the palatability test, cats mostly preferred diets based on HCL and with higher protein concentrations, mainly HCL40, over those based on PBM (Power test >0.75). The replacement of PBM by HCL in diets was highly accepted and improved the fermentative end metabolites associated with intestinal functionality in cats, especially SCFA.
用基于水解蛋白的日粮喂养伴侣猫，由于其中存在肽和游离氨基酸，可能会提高适口性和消化率。此外，使用高消化率的蛋白质来源可以减少到达后肠的未消化蛋白质含量，从而改变发酵终产物。本研究旨在评估用日粮中粗蛋白（CP）含量分别为24%、32%和40%的水解鸡肝（HCL）替代家禽副产品粉（PBM）（猫最传统的蛋白质来源）并替代啤酒糟中的碳水化合物的效果。两种成分与三种CP添加量的组合使得能够测试6种挤压日粮：PBM24、PBM32、PBM40；HCL24、HCL32和HCL40。36只成年猫被安排在完全随机区组设计中，以评估营养物质和能量的表观全肠道消化率（ATTD）、发酵终产物和适口性。粗蛋白ATTD在较高蛋白质浓度下增加（P = 0.036）。饲喂HCL40的猫的脂肪ATTD较低（P = 0.046）。由于实验日粮中用蛋白质替代了碳水化合物，碳水化合物消化率随着高蛋白摄入量而降低（P < 0.05）。饲喂HCL32的猫的总能ATTD较低（P = 0.027）。同样，与饲喂PBM的猫相比，饲喂HCL和HCL32的猫的可代谢能量较低（P < 0.05）。添加HCL后，粪便干物质（P = 0.005）和粪便评分（P = 0.014）较低（P < 0.05）。此外，与其他日粮相比，饲喂HCL32的猫的粪便较稀（0至5分制中为2.61分；P = 0.025），但仍在可接受范围内。尿液pH值随着HCL的添加和较高蛋白质浓度而升高（P < 0.05）。与饲喂PBM的猫相比，饲喂HCL的猫的粪便乙酸、丙酸、戊酸、总短链脂肪酸（SCFA）、异戊酸和总挥发性脂肪酸（VFA）含量更高（P < 0.05）。在适口性测试中，与基于PBM的日粮相比，猫大多更喜欢基于HCL且蛋白质浓度较高的日粮，主要是HCL40（功效检验>0.75）。日粮中用HCL替代PBM被高度接受，并改善了与猫肠道功能相关的发酵终产物，尤其是SCFA。
