J. Anim Sci.
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J. Anim Sci. 1969. 28:443-448.
© 1969 American Society of Animal Science
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Effect of Antemortem Injected Phosphate and Dietary Calcium and Phosphorus on Muscle pH and Tenderness1

D. L. Huffman2, A. Z. Palmer, J. W. Carpenter and R. L. Shirley3

Florida Agricultural Experiment Station, Gainesville

Abstract

An experiment was carried out to determine the effect of dietary Ca:P ratio and antemortem phosphate injection on muscle pH and tenderness. Muscle and blood calcium and bone phosphorus levels of mature sheep were influenced significantly by altering Ca:P ratio during a 28-day feeding period. Loin chops from animals fed a low Ca:P ration were significantly (P<.05) more tender than chops from animals fed a high Ca:P ration or control animals according to Warner-Bratzler shear data.

Loin chops from 4 lots of animals injected with pyrophosphate or hexametaphosphate antemortem averaged more tender than chops from control animals. Chops from animals injected with pyrophosphate 48, 24 and 3 hr. antemortem were significantly (P<.05) more tender than chops from control animals. Significant (P<.05), but low, correlation coefficients were found between loin chop tenderness and blood calcium, muscle phosphorus and bone phosphorus.

Muscle pH averaged lower initially for the four phosphate injected lots than controls. While no correlation was found between tenderness and muscle pH, it was noted that meat from animals fed a low Ca:P ration was significantly (P<.05) more tender than that from control animals and the initial pH of low Ca:P animals was significantly (P<.05) lower than controls.

Footnotes

1 Florida Agricultural Experiment Station Journal Series No. 3065.

2 Present address: Department of Animal Science, Auburn University, Auburn, Alabama. V

3 Department of Animal Science.






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Copyright © 1969 by the American Society of Animal Science.