动物营养学报2017，Vol.29Issue(6)：1884-1894,11.DOI:10.3969/j.issn.1006-267x.2017.06.009
饲粮异亮氨酸水平对肥育猪生长性能、胴体性状和肉品质的影响
Effects of Dietary Isoleucine Level on Growth Performance, Carcass Traits and Meat Quality of Finishing Pigs
摘要
Abstract
This experiment aimed to investigate the effects of dietary isoleucine level on growth performance, carcass traits and meat quality of finishing pigs.Seventy-two Duroc×Landrace×Large White barrows with the body weight of (77.0±0.1) kg were assigned into 3 groups with 6 replicates per group and each replicate had 4 barrows.The barrows in the three groups were fed diets contained 0.25% (low isoleucine level which showed isoleucine deficiency;L-Ile group), 0.39% (NRC recommended level of isoleucine;N-Ile group, as control group) and 0.53% (high isoleucine level which showed isoleucine excess;H-Ile) standardized ileal digestible isoleucine, respectively.The experiment lasted for 28 days.The results showed that dietary isoleucine level had no effects on average daily gain and average daily feed intake of finishing pigs (P>0.05), but the feed/gain of finishing pigs in L-Ile group was significantly increased compared with control group (P<0.05).As the isoleucine level increasing, the content of intramuscular fat in longissimus dorsi was linear improved (P<0.05), while the shear force was linear decreased (P<0.05).Compared with the control group, the back-fat depth, loin eye area and flesh color score of finishing pigs fed isoleucine deficient diet were significantly reduced (P<0.05), and the hot carcass weight, dressing percentage, and drip loss and yellowness value of longissimus dorsi of finishing pigs fed isoleucine deficient or excess diets were significantly reduced (P<0.05).As dietary isoleucine level increasing, serum triglyceride content was linear increased (P<0.05), while serum urea nitrogen content was linear decreased (P<0.05).Compared with the control group, the serum glucose content of finishing pigs fed isoleucine excess diet was significantly increased (P<0.05), while the concentrations of serum free essential amino acids, non-essential amino acids and total amino acids of finishing pigs fed isoleucine excess diet were significantly reduced (P<0.05), and the contents of serum total cholesterol, low density lipoprotein and high density lipoprotein of finishing pigs fed isoleucine deficient or excess diets were significantly reduced (P<0.05).The results indicate that isoleucine deficient diet has a negative effect on growth performance, carcass traits and intramuscular fat content of finishing pigs, but isoleucine excess diet can significantly reduce the shear force and drip loss of muscle and increase the intramuscular fat content of finishing pigs, even at the cost of reducing hot carcass weight and dressing percentage.关键词
异亮氨酸/生长性能/胴体性状/肉品质/血清生理生化指标/血清游离氨基酸Key words
isoleucine/growth performance/carcass traits/meat quality/serum physiological and biochemical indexes/serum free amino acids分类
农业科技引用本文复制引用
罗燕红,张鑫,覃春富,焦宁,尹靖东..饲粮异亮氨酸水平对肥育猪生长性能、胴体性状和肉品质的影响[J].动物营养学报,2017,29(6):1884-1894,11.基金项目
国家973计划项目(2012CB124700) （2012CB124700）
国家自然科学基金项目(31272452) （31272452）
