吡啶羧酸铬和天冬氨酸镁对猪肉品质的影响

选择48头体重接近(86.0±5.1)kg的杜长大肥育阉公猪,研究天冬氨酸镁和吡啶羧酸铬对猪宰前应激肉品质的影响。试验猪分为4组,Ⅰ组为对照组,Ⅱ、Ⅲ、Ⅳ组为试验组,每组3个重复,每个重复4头,采食玉米-豆粕型日粮(DE,13.18MJ/kg;CP,14.6%)。Ⅰ组饲喂基础日粮;Ⅱ组饲喂基础日粮+1.0%天冬氨酸镁(MgAsp);Ⅲ组饲喂基础日粮+0.3mg/kg吡啶羧酸铬(Crpi);Ⅳ组饲喂基础日粮+1.0%MgAsp+0.3mg/kgCrpi。每头猪每日饲喂2.8kg上述试验日粮,7d后运到屠宰场。结果表明,日粮中补充吡啶羧酸铬、天冬氨酸镁、吡啶羧酸铬+天冬氨酸镁均降低了血清中皮质醇含量,减缓了屠宰前的应激反应;给宰前的育肥猪补充吡啶羧酸铬、吡啶羧酸铬+天冬氨酸镁均可降低宰后糖原分解(P0.05),补充天冬氨酸镁也有降低宰后糖原分解的趋势。补充吡啶羧酸铬、天冬氨酸镁及吡啶羧酸铬+天冬氨酸镁均可显著降低宰后短时间内猪背最长肌和股二头肌乳酸含量(P0.05);日粮中补充吡啶羧酸铬、天冬氨酸镁及吡啶羧酸铬+天冬氨酸镁均可极显著(P0.01)降低背最长肌和股二头肌pH和滴水损失,分别降低PSE肉发生率75.1%、49.8%和75.1%(P0.05),而对系水力无显著影响(P0.05));复合添加吡啶羧酸铬、天冬氨酸镁组猪的滴水损失、背最长肌和股二头肌色值都显著低于单独添加吡啶羧酸铬、天冬氨酸镁组,这说明吡啶羧酸铬、天冬氨酸镁在改善肉质指标方面具有一定的加性效应,二者同时添加效果最好。

Effect of Chromium Picolinate and Magnesium Aspartate on Pork Quality

An experiment was conducted to determine the effect of chromium picolinate and magnesium aspartate on pork quality. 48 Duroc×Landrace×Yorkshire finishing pigs with initial average body weight (86.0±5.1) kg were divided into four dietary treatments(Ⅰ,Ⅱ,Ⅲ and Ⅳ) with 4 of each treatment. Treatment Ⅰfed corn-soybean meal (C-SBM, control), treatment Ⅱ fed C-SBM+1.0% magenesium aspartate (MgAsp), treatment Ⅲ fed C-SBM+0.3 mg/kg chromium picolinate (Crpi), treatment Ⅳ fed C-SBM+1.0% MgAsp+0.3 mg/kg Crpi. 2.8 kg upper diet/day was fed to each pig for seven days before transport to slaughterhouse. Pork quality data were collected and measured. Serum cortisol level was significant decreased after supplement with MgAsp, Crpi and MgAsp+Crpi (P＜0.05). The glycogenolysis was decreased after supplement with Crpi and MgAsp+Crpi(P＜0.05). The content of lactic acid, pH and drip loss of the back longissimus and the biceps femoris was decreased in pigs supplement with MgAsp, Crpi and MgAsp+Crpi than the control pigs, and the occurrence of PSE (pale, soft and exudative) pork decreased 75.1%, 49.8% and 75.1%, respectively(P＜0.05). The water holding capacity was not different between four treatments. The drop loss, color scores of back longissimus and biceps femoris were better in pigs supplement with both MgAsp and Crpi than pigs supplement individually. These data indicated that MgAsp and Crpi may favor to each other for anti-stress and improvement the meat quality,addtion of MgAsp and Crpi together gave the best effect.