Effects Of Dietary Lysine And Digestive Energy Level On The Carcass And Meat Quality Of Rongchang Pigs And The Expression Of ADD1 And Insulin Receptor Of Defferent Tissues.

Ninety-six Rongchang barrows (20±2) kg were used to determine the effects of dietary digestive energy (DE) and Lysine levels on the carcass and meat quality and the expression of ADD1 and insulin receptor. When the average body weight (BW) of a pen reached 60 kg and 90 kg, one pig per pen was selected and slaughtered for carcass and pork measurements with the left side of each carcass. The results showed that the feed over gain ratio was decreased (P < 0.05), average backfat depth was increased (P < 0.05) and water loss was decreased (P < 0.05) when Rongchang barrows were fed with increasing dietary DE. Meat pH value significantly increased after slaughtered 1 h and 24 h (P < 0.05), and the intramuscular fat contents decreased with the increasing ratio of Lysine:DE (P < 0.05). When the average body weight (BW) of a pen reached 60 kg, The results showed that the expression of ADD1 in liver,muscle and fat tissues didn't change when Rongchang barrows were fed with increasing dietary DE, but the expression of insulin receptor in muscle significantly increased (P < 0.05) and decressed (P < 0.05) in fat tissue.With increasing ratio of Lysine:DE, the expression of insulin receptor in liver significantly increased (P < 0.05). When the average body weight (BW) of a pen reached 90 kg, the expression of ADD1 in fat and liver significantly decreased (P < 0.05) with increasing dietary DE, and the expression of insulin receptor in fat tissue increased (P < 0.05). The expression of ADD1 significantly decreased (P < 0.05) and the expression of insulin receptor increased (P < 0.05) with increasing ratio of Lysine: DE.