Use of dietary supplementation with β-guanidinopropionic acid to alter the muscle phosphagen system,postmortem metabolism,and pork quality |
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Authors: | TL Scheffler AL RosserSC Kasten JM SchefflerDE Gerrard |
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Affiliation: | Department of Animal and Poultry Sciences, Litton-Reaves Hall, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA |
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Abstract: | Rate and extent of postmortem metabolism control pork quality development. Our objective was to evaluate the role of the phosphagen system (phosphocreatine, PCr; and creatine, Cr) on metabolism and pork quality. Muscle PCr and Cr were manipulated by feeding pigs the creatine analogue, β-guanidinopropionic acid (β-GPA). In experiment 1, pigs received standard (control) diet or β-GPA supplemented (2%) diet (1 wk or 2 wk). Supplementation with β-GPA (2 wk) decreased total Cr (PCr + Cr; P = 0.02) and improved pork color (decreased reflectance, P = 0.003); however, β-GPA supplementation reduced growth performance (P = 0.007). To separate effects of phosphagen system and growth, a second experiment was conducted with control, pair-fed, and 2 wk β-GPA (1%) supplementation; pigs were also offered a control or β-GPA supplemented flavored beverage. Neither treatment influenced pork quality. Immediately postmortem, ATP/ADP was higher in control compared to pair-fed (P < 0.05); subsequently, ATP/ADP was similar among all groups. Loss of the phosphagen system may lead to adaptive changes that promote conservation of cellular ATP. |
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Keywords: | Phosphagen system pH Pork quality Energy metabolism Creatine |
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