Adebowale Tolulope, Oso Abimbola, Liu Hongnan, Tossou Myrlene, Chen Jiashun, Li Huang, Kang Baoju, Yao Kang
University of the Chinese Academy of Sciences, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences; Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production; Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Changsha 410125, China.
Department of Animal Nutrition, Federal University of Agriculture, Abeokuta PMB 2240, Nigeria.
J Poult Sci. 2019 Apr 25;56(2):112-119. doi: 10.2141/jpsa.0170212.
The growth performance, nutrient digestibility, hematology, serum chemistry, and lipoprotein concentrations of turkey () poults fed diets supplemented with high or recommended concentrations of niacin were investigated in this study. A total of 120 four-week-old turkey poults were randomly divided into three treatment groups with five replicates of eight birds in each group. The poult diets were supplemented with 0.0, 60, and 180 mg/kg niacin in the three treatments, termed control, recommended niacin supplementation (RNS), and high niacin supplementation (HNS), respectively. The study lasted for four weeks. The results showed that the HNS treatment reduced the feed intake and increased the body weight gain of poults. The apparent, nitrogen-corrected, and true metabolizable energy contents were the highest in the HNS-group turkey poults (<0.05). The red and white blood cell counts and hemoglobin concentration of the turkeys improved with increasing niacin supplementation (<0.01). The serum constituents, including the serum protein and globulin, were significantly increased (<0.05), while the uric acid and creatinine contents were significantly reduced in the HNS-group turkeys. Similarly, the HNS-group turkeys exhibited significantly reduced alanine aminotransferase (ALT) and alkaline phosphatase (ALP) contents, while the RNS-group turkeys had the least aspartate aminotransferase (AST) content. In addition, the HNS-group turkeys had the least serum low-density lipoprotein (LDL), triglyceride, and total cholesterol concentrations and the highest serum high-density lipoprotein (HDL) (<0.01) concentrations. In conclusion, the supplementation of 180 mg/kg niacin in the diet reduced the feed intake and serum ALT, ALP, LDL, triglyceride, and cholesterol contents and increased the body weight gain, metabolizable energy, and HDL concentration in turkeys. This study showed that niacin supplementation could reduce the fat content without compromising the body weight gain and increase stress resistance in turkey poults.
本研究调查了饲喂添加高浓度或推荐浓度烟酸日粮的火鸡雏鸡的生长性能、养分消化率、血液学指标、血清生化指标和脂蛋白浓度。总共120只4周龄的火鸡雏鸡被随机分为三个处理组，每组五个重复，每个重复八只鸡。在三种处理中，雏鸡日粮分别添加0.0、60和180 mg/kg烟酸，分别称为对照组、推荐烟酸添加量（RNS）组和高烟酸添加量（HNS）组。研究持续了四周。结果表明，HNS处理降低了雏鸡的采食量，但增加了体重增加量。HNS组火鸡雏鸡的表观代谢能、氮校正代谢能和真代谢能含量最高（P<0.05）。随着烟酸添加量的增加，火鸡的红细胞和白细胞计数以及血红蛋白浓度得到改善（P<0.01）。HNS组火鸡的血清成分，包括血清蛋白和球蛋白，显著增加（P<0.05），而尿酸和肌酐含量显著降低。同样，HNS组火鸡的丙氨酸转氨酶（ALT）和碱性磷酸酶（ALP）含量显著降低，而RNS组火鸡的天冬氨酸转氨酶（AST）含量最低。此外，HNS组火鸡的血清低密度脂蛋白（LDL）、甘油三酯和总胆固醇浓度最低，血清高密度脂蛋白（HDL）浓度最高（P<0.01）。总之，日粮中添加180 mg/kg烟酸可降低火鸡的采食量、血清ALT、ALP、LDL、甘油三酯和胆固醇含量，并增加体重增加量、代谢能和HDL浓度。本研究表明，添加烟酸可以在不影响火鸡雏鸡体重增加的情况下降低脂肪含量，并提高其抗应激能力。
