热应激条件下脂肪来源对肉兔生产性能、养分消化率及血清脂质代谢和抗氧化指标的影响

发布时间：2018-03-07 16:27

本文选题：热应激　切入点：肉兔　出处：《动物营养学报》2017年05期 　论文类型：期刊论文

【摘要】：本试验旨在研究热应激条件下脂肪来源对肉兔生产性能、养分消化率及血清脂质代谢和抗氧化指标的影响。试验选择30日龄的断奶新西兰兔600只,随机分成5个组,每个组6个重复,每个重复20只。对照组饲喂基础饲粮,各脂肪添加组分别饲喂含2%牛油、猪油、玉米油、豆油的饲粮。试验兔均饲养在热应激兔舍(温湿指数为29.5±0.5)中。试验期7周。结果表明:与对照组相比,热应激条件下饲粮中添加不同来源的脂肪均可以显著提高肉兔的平均日增重(P0.05),显著降低料重比(P0.05),其中以玉米油的效果最佳。与对照组相比,热应激条件下饲粮中添加不同来源的脂肪均可以显著提高肉兔的干物质和粗蛋白质消化率(P0.05),显著降低粗脂肪消化率(P0.05),但对粗灰分和粗纤维消化率无显著影响(P0.05),其中玉米油组的干物质消化率最高,豆油组的粗蛋白质消化率最高。与对照组相比,热应激条件下饲粮添加牛油或猪油可以显著提高肉兔血清甘油三酯和总胆固醇含量(P0.05);玉米油组和豆油组肉兔血清甘油三酯和总胆固醇含量则与对照组差异不显著(P0.05)。与对照组相比,热应激条件下饲粮添加豆油和玉米油可以显著提高肉兔血清超氧化物歧化酶活性和总抗氧化能力(P0.05),显著降低血清丙二醛含量(P0.05);牛油组和猪油组血清超氧化物歧化酶活性、总抗氧化能力和丙二醛含量则与对照组差异不显著(P0.05)。由此可见,热应激条件下,饲粮添加不同来源的脂肪均可提高肉兔生产性能及干物质和粗蛋白质消化率,从整体效果来看,玉米油豆油猪油牛油;饲粮添加牛油或猪油可提高肉兔血清甘油三酯和总胆固醇含量,对机体抗氧化能力的影响不显著;饲粮添加豆油或玉米油对肉兔血清甘油三酯和总胆固醇含量无显著影响,但可显著提高机体的抗氧化能力。
[Abstract]:The purpose of this study was to study the effects of fat sources on the performance, nutrient digestibility, serum lipid metabolism and antioxidant index of meat rabbits under heat stress. 600 New Zealand rabbits were randomly divided into 5 groups. The control group was fed with basic diet, and the fat supplementation groups were fed with 2% butter, lard and corn oil, respectively. The experimental rabbits were fed in heat stress rabbits (temperature and humidity index 29.5 卤0.5) for 7 weeks. The results showed that: compared with the control group, all the rabbits were fed with soybean oil. Under the condition of heat stress, the addition of fat from different sources in diet could significantly increase the average daily gain (ADG) of rabbits and decrease the feed / weight ratio (P0.05N) significantly. The effect of corn oil was the best, compared with the control group. Under the condition of heat stress, the digestibility of dry matter and crude protein was significantly increased and the digestibility of crude fat was decreased significantly, but the digestibility of crude ash and crude fiber was not significantly affected by the addition of fat from different sources in diet. The dry matter digestibility of medium corn oil group was the highest. The crude protein digestibility of soybean oil group was the highest. Under the condition of heat stress, dietary supplementation with butter or lard could significantly increase the serum triglyceride and total cholesterol content of meat rabbits, while the serum triglyceride and total cholesterol contents of corn oil group and soybean oil group were not significantly different from those of the control group. Compared with the control group, Adding soybean oil and corn oil to diet under heat stress could significantly increase the activity of serum superoxide dismutase (SOD) and total antioxidant capacity (P0.05N), decrease the content of malondialdehyde (MDA) in serum and decrease the activity of superoxide dismutase (SOD) in serum of butter group and lard group. The total antioxidant capacity and malondialdehyde content were not significantly different from those of the control group. It can be seen that under the condition of heat stress, dietary fat from different sources could improve the performance, dry matter and crude protein digestibility of the rabbits. The content of serum triglyceride and total cholesterol was increased by adding butter or lard to the diet, but the effect on the antioxidant ability was not significant. The dietary supplementation of soybean oil or corn oil had no significant effect on serum triglyceride and total cholesterol, but could significantly improve the antioxidant capacity of the body.
【作者单位】：四川省畜牧科学研究院;动物遗传育种四川省重点实验室;
【基金】：公益性行业(农业)科研专项经费(201303145) 国家兔产业技术体系(CARS-44-B-4) 家家兔现代产业链关键技术集成研究与产业化示范(2016NZ0002) 四川省育种攻关项目(2016NYZ0046)
【分类号】：S829.1

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