College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China.
College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China.
Poult Sci. 2021 Nov;100(11):101430. doi: 10.1016/j.psj.2021.101430. Epub 2021 Aug 14.
The purpose of this study was to evaluate the effects of nicotinic acid (NA) supplementation on the meat quality, carcass characteristics, lipid metabolism, and tibia parameters in Wulong geese. A total of 360 twenty-nine-day-old Wulong geese were randomly divided into 6 treatments, and each treatment included 6 pens with 10 birds per pen. Birds were fed a basal diet supplemented with 0, 20, 40, 60, 80, or 100 mg/kg NA for 12 wk. Dietary NA supplementation linearly decreased L* value and increased pH and water-holding capacity in the breast muscle (P < 0.05). Increasing NA levels linearly and quadratically decreased shear force of breast muscle (P < 0.001). Dietary NA supplementation linearly reduced the thickness of subcutaneous fat plus the skin and percentage of abdominal fat, and enhanced the width of intermuscular fat band (P < 0.001). Dietary NA addition linearly and quadratically increased intramuscular fat (IMF) content (P ≤ 0.001). Increasing NA levels decreased serum total cholesterol and low-density lipoprotein cholesterol levels and increased serum lipase activity and hepatic mRNA expression of lipoprotein lipase in a linear manner (P < 0.05). There were linear and quadratic effects in serum triglycerides and high-density lipoprotein cholesterol (HDL-C) levels and malate dehydrogenase activity with the NA addition (P < 0.05). Feeding the NA-supplemented-diets linearly increased tibia length, circumference, fat-free dry weight, and ash content (P < 0.001). There were linear and quadratic increases in Ca and P contents with the NA supplementation (P < 0.05). According to the quadratic regression analyses fitted to shear force, IMF content, serum triglycerides and HDL-C levels, and tibial Ca and P contents, the optimal dietary NA supplementation was 80 to 90 mg/kg. In conclusion, NA addition enhanced meat quality and IMF content, regulated lipid metabolism, and increased tibia quality of Wulong geese. The dosage of 80 mg/kg NA in Wulong geese aged 5 to 16 wk was recommended.
本研究旨在评估烟酸（NA）补充对五龙鹅肉质、屠体特征、脂代谢和胫骨参数的影响。将 360 只 29 日龄五龙鹅随机分为 6 个处理组，每个处理组包括 6 个重复，每个重复 10 只鹅。试验鹅饲粮添加 0、20、40、60、80 或 100mg/kg NA ，试验期 12 周。饲粮 NA 补充线性降低胸肌 L*值，提高 pH 值和滴水损失（P＜0.05）。随 NA 添加水平线性和二次增加胸肌剪切力（P＜0.001）。饲粮 NA 补充线性降低皮下脂肪加皮厚和腹脂率，增加肌间脂肪带宽（P＜0.001）。饲粮添加 NA 线性和二次增加肌内脂肪（IMF）含量（P≤0.001）。随 NA 添加水平线性和二次降低血清总胆固醇和低密度脂蛋白胆固醇含量，增加血清脂肪酶活性和肝载脂蛋白脂肪酶 mRNA 表达（P＜0.05）。血清甘油三酯和高密度脂蛋白胆固醇（HDL-C）水平及苹果酸脱氢酶活性随 NA 添加呈线性和二次变化（P＜0.05）。饲粮添加 NA 线性增加胫骨长度、周长、无脂干重和灰分含量（P＜0.001）。随 NA 添加，Ca 和 P 含量呈线性和二次增加（P＜0.05）。根据剪切力、IMF 含量、血清甘油三酯和 HDL-C 水平及胫骨 Ca 和 P 含量的二次回归分析，饲粮 NA 的最佳添加量为 8090mg/kg。综上，NA 添加可改善五龙鹅肉质和 IMF 含量，调节脂代谢，提高胫骨品质。建议 516 周龄五龙鹅饲粮 NA 添加量为 80mg/kg。
