本试验旨在研究日粮碳水化合物/蛋白质水平对240日龄不同品种猪肌内脂肪(IMF)含量和胃肠道重量、长度及消化酶活性的影响,并探讨IMF含量与胃肠道重量、长度及消化酶活性的关系.试验采用2×2因子试验没计,即杜洛克×长白×大约克三元杂交猪(DLY)和太湖猪2个品种,每个品种分别饲喂高碳水化合物/低蛋白(HC/LP)和低碳水化合物/高蛋白(LC/HP)2种日粮.选用150日龄的DLY猪和太湖猪各12头,按体重相近、性别一致的原则共分为4个试验组,每个试验组6个重复,每个重复1头猪.饲养90 d后屠宰取样.结果表明:与LC/HP日粮相比,HC/LP日粮极显著提高了DLY猪的IMF含量(IMF为5.83%)(P<0.01),对太湖猪有提高的趋势(P>0.05),但2种日粮对2品种猪眼肌面积和背膘厚没有显著影响(P>0.05);HC/LP日粮显著(P<0.05)或极显著(P<0.01)降低了2品种猪的胰重和胰指数;无论在何种日粮下,太湖猪的胃、胰、小肠指数都极显著高于DLY猪(P<0.01);HC/LP日粮降低了2品种猪的消化酶活性,但对DLY猪的胰淀粉酶单位活性有所升高(P>0.05),其中对太湖猪的胃蛋白酶和胰脂肪酶活性的影响达到极显著水平(P<0.01).在LC/HP日粮下,太湖猪胰脂肪酶活性极显著高于DLY猪(P<0.01);在HC/LP日粮下,DLY猪的胰淀粉酶活性显著高于太湖猪(P<0.05).因此,HC/LP日粮在对2品种猪眼肌面积和背膘厚影响较小的情况下,可大幅度提高240日龄DLY猪的IMF含量,而大幅度降低了2品种猪的胰重和太湖猪的胃蛋白酶和胰脂肪酶活性,对2品种猪的胃、肝和小肠的重量或长度影响不大.%This experiment was conducted to study the effects of dietary carbohydrate/protein levels on intramuscular fat (IMF) concentration and gastrointestinal tract weight, length and digestive enzyme activity between Duroc×Landrace× Yorkshire (DLY) pigs and Taihu pigs of 240-day-old, and to investigate the relationships among IMF concentration and gas-trointestinal tract weight, length and digestive enzyme activity.Twelve DLY pigs and twelve Taihu pigs were randomly allo-cated to 2 treatments with 6 replicates in each and 1 pig in each replicate according to gender and weight using a 2×2 factors experiment design, and feed either high-carbohydrate/low-protein (HC/LP) or low-carbohydrate/high-protein (LC/HP), respectively.The feeding trial lasted for 90 days.The results showed that compared with LC/HP diet, HC/LP diet could in-crease the IMF concentration of DLY pigs (IMF concentration was 5.83%)(P<0.01) and had a elevated tendency onTaihu pigs (P>0.05), but the effects of the two diets on loin eye area and back fat thickness in two breeds were not signifi-cant (P>0.05); compared with LC/HP diet, HC/LP diet had lower pancreas weight and pancreas index in two breeds of pigs (P<0.05 or P<0.01); the stomach, intestine and pancreas index of Taihu pigs were greater than those of DLY pigs (P<0.01) regardless of HC/LP diet or LC/HP diet.The digestive enzyme activity in the two breeds was lowed by HC/LP diet, but the pancreatic amylase per activity of DLY pigs was lowed by HC/LP diet (P>0.05), moreover, the effects of HC/LP diet on Taihu pigs pepsin and pancreatic lipase activity were significant (P<0.01); the pancreatic lipase activity of Taihu pigs was higher than that of DLY pigs (P<0.01), and pancreatic amylase activity of DLY pigs were higher than that of Taihu pigs in HC/LP diet (P<0.05).Therefore, The IMF concentration of 240-day-old DLY pigs was elevated greatly by LC/HP diet, but the effect of it on loin eye area and back fat thickness in two breeds was little, and the weight of pan-creas in DLY pigs and pepsin and pancreatic lipase activity in Taihu pigs were lowed greatly by HC/LP diet.The effect of HC/LP diet on stomach, liver and small intestinal weight or length was little.
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