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Asian-Australas J Anim Sci > Volume 9(6); 1996 > Article
Animal Reproduction and Physiology
Asian-Australasian Journal of Animal Sciences 1996;9(6): 715-722.
DOI: https://doi.org/10.5713/ajas.1996.715    Published online December 1, 1996.
Relationships between eggshell quality and biochemical parameters of calcium metabolism
C. W. Kang, K. T. Nam, O. E. Olson, C. W. Carlson
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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