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Relationships between eggshell quality and biochemical parameters of calcium metabolism |
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C. W. Kang, K. T. Nam, O. E. Olson, C. W. Carlson |
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| Abstract |
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To determine relationships of biochemical parameters involnved in Ca metabolism with eggshell quality, serum Ca level, duodenal and uterine calcium binding protein(CaBP) and uterine carbonic anhydrase(CA) activities were measured using 102-week old hens. Three groups of chickens were selected, those showing high quality(HQ) and low quality(LQ) eggshells and non-laying activity(NE). NE hens exhibited significantly(p<0.05) lower serum Ca levels than laying hens. HQ and LQ hens were not different in the Ca level, indicating that serum Ca lenvel was not good indicator of hen`s ability to produce different quality eggshells. Duodenal CaBPs was highest in HQ and lowest in NE(p<0.10). Uterine CaBPs of LQ and NE were not different and lower significantly(p<0.10) than that of HQ, suggesting that CaBP played an important role in determining eggshell quality. Uterine CA activities of the three groups were significantly different(p<0.01) ; highest in HQ and lowest in NE, suggesting intimate relationship between CA and Eggshell quality. |
| Keywords:
Eggshell Quality; Blood Ca Level; CaBP; Carbonic Anhydrase |
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