不同储藏条件下杜洛克与长白猪肌肉pH、糖原、乳酸含量及TBA值比较

研究测定了杜洛克及长白猪屠宰后10 h、4℃冷藏6 d、-20℃冷冻5 d的肌肉p H、糖原、乳酸含量和TBA值（硫代巴比妥酸值）。结果表明,宰后10 h,宰后时间对杜洛克及长白猪肌肉p H、乳酸影响极显著,对糖原、TBA值影响不显著。猪种间比较,第3小时和第5小时的p H杜洛克分别比长白猪高4.37%（P〈0.01）和3.93%（P〈0.05）;第0.75小时、第2小时和第5~7小时的肌糖原含量杜洛克分别比长白猪高166.83%（P〈0.01）、120.59%（P〈0.01）、117.02%（P〈0.05）、154.31%（P〈0.01）、147.23%（P〈0.05）;宰后45 min、第2~4小时和第7~8小时的乳酸含量长白猪分别比相同时间点的杜洛克猪高37.99%（P〈0.05）、27.46%（P〈0.05）、68.90%（P〈0.01）、33.19%（P〈0.05）、52.97%（P〈0.01）和47.05%（P〈0.05）。4℃冷藏条件下,储存时间对杜洛克猪肌肉p H、糖原含量、乳酸含量和TBA值影响不显著,对滴水损失影响显著;对长白猪肌肉p H、糖原含量影响不显著,对滴水损失、乳酸含量和TBA值影响显著。4℃冷藏条件下储藏6 d,肌肉p H、糖原含量和TBA值品种间差异不显著;第48小时乳酸含量杜洛克比长白猪高25.10%（P〈0.05）;第24小时和第48小时滴水损失长白猪分别比杜洛克高160.96%（P〈0.05）和60.06%（P〈0.05）。-20℃冷冻条件下,储存时间对杜洛克猪肌肉p H影响显著,对解冻失水率、糖原、乳酸、TBA值影响不显著;对长白猪肌肉p H、解冻失水率、糖原及乳酸含量影响不显著,对TBA值影响显著。-20℃冷冻条件下储藏5 d,杜洛克和长白猪相同时间点的p H、糖原含量、TBA值差异不显著;第48小时乳酸含量杜洛克比长白猪高23.71%（P〈0.05）,第120小时乳酸含量长白猪比杜洛克高10.78%（P〈0.05）;第24小时和第72小时解冻失水率长白猪分别比杜洛克高186.85%（P〈0.05）和127.20%（P〈0.05）。

Compare of Muscle pH,Glycogen, Lactic Acid and TBA Contents of Duroc and Landrace in Different Storage Conditions

Muscle pH values, glycogen, lactic acid and 2-thiobarbituric acid（TBA） contents of Duroc and Landrace were studied 10 h after slaughter, with the storage condition of 4 ℃ for 6 days and with the storage condition of-20℃ for 5 days. The results showed that 10 h after slaughter, the effects of time after slaughter on muscle pH and lactic acid contents of Duroc and Landrace were extremely statistically significant, on glycogen and TBA values were not statistically significant. Interspecific comparison of pigs, thirth hour and fifth hour after slaughtering of Duroc pH increased by 4.37%（P〈0.01）and 3.93%（P〈0.05） compare with Landrace respectively. Douroc glycogen contents of 45 minutes,second hour,fifth hour,sixth hour and seventh hour increased by 166.83%（P〈0.01）,120.59%（P〈0.01）,117.02%（P〈0.05）,154.31%（P〈0.01）and 147.23%（P〈0.05）compare with Landrace respectively. Lactic acid contents of Landrace for 45 minutes and second hour, third hour, fourth hour, seventh hour and eighth hour after slaughter increased by 37.99%（P〈0.05）,27.46%（P〈0.05）,68.90%（P〈0.01）, 33.19%（P〈0.05）,52.97%（P〈0.01）and 47.05%（P〈0.05）compare with Duroc respectively. With the storage condition of 4 ℃, the effects of storage time on pH values, glycogen lactic acid and TBA values of Duroc were not statistically significant, but it on drop loss was statistically significant. The effects of storage time on pH values, glycogen contents and of Landrace were not statistically significant, but it on drop loss, lactic acid contents and TBA values were statistically significant. With the storage condition of 4 ℃ for 6 days, pH values, glycogen contents and TBA values of Duroc and Landrace were not statistically significant. Lactic acid contents of Duroc for the 48 hour increased by 25.10%（P〈0.05）compare with Landrace. Drop loss of Landrace for the 24 hour and 48 hour increased by 160.96%（P〈0.05）and 60.06%（P〈0.05）compare with Duroc respectively.With the sto