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Abstract
1. Sudden Death Syndrome (SDS) is a disease of well‐developed, predominandy male broiler chickens where death appears to occur because of cardiovascular failure. The role of skeletal muscle sarcoplasmic calcium regulation as a potential cause of SDS has been investigated.
2. Calcium regulation of skeletal muscle sarcoplasmic reticulum was compared between broiler and Leghorn chickens. Calcium regulation matured from the 2nd to the 11 th week and, at any age, broiler chickens showed significandy lower calcium transport rates and transport efficiencies. The mechanism of calcium transport in broiler chickens was more energy‐consuming than that of the Leghorn chickens.
3. Sarcoplasmic calcium regulation is pivotal for muscle metabolism. As in porcine malignant hyperthermia, weaker calcium regulation might lead to hyperactivation of skeletal muscle, followed by elevated lactic acid concentrations and cardiovascular failure.