To determinate the calcium and phosphorus requirements for maintenance and growth of Guizhou Xiang pigs, six castrated Congjiang Xiang pigs and six castrated Jianbai Xiang pigs at the age of 3.5 to 4 months and with the same body weight of (11.06±2.61) kg and genetic background were selected as experimental animals in this study. Calcium- and phosphorus-free purified diets were adopt in this study to investigate the metabolic regulation of endogenous calcium and phosphorus in Guizhou Xiang pigs. 34 Congjiang Xiang pigs aged from 60 to 75 days and fed with the protein-free diets equalized digestible energy (DEpf) were selected to measure the deposition regulation and requirements of calcium and phosphorus in growing Guizhou Xiang pigs using a comparative slaughter method. The results showed as follows: 1)the losses of endogenous calcium and phosphorus of Guizhou Xiang pigs were 47.2 and 20.8 mg/kg BW per day, respectively. 2)The deposition of calcium and phosphorus were 10.86 and 4.50 g/kg of fat-free gain from 7 to 16 kg live body weight and 8.02 and 4.75 g/kg of fat-free gain from 16 to 25 kg live body weight, respectively. The results indicate that requirements of net calcium and phosphorus for maintenance are 47.2 and 20.8 g/kg BW and for growth are (10.03－0.184 BW) and 3.46 g/kg BW in Guizhou Xiang pigs, respectively. The true digestibility of calcium and available phosphorus of conventional compound diets may be estimated by 60% and 67%, respectively.［Chinese Journal of Animal Nutrition, 2011, 23（8）：1402 -1408］
YANG Zhengde,XU Wanli,KONG Deshun,DAI Yi,WU Ping
. Endogenous Calcium and Phosphorus Metabolism in Guizhou Xiang Pigs: Deposition and Requirements of Calcium and Phosphorus
for the 7 to 25 kg Growth Period[J]. Chinese Journal of Animal Nutrition, 2011
, 23(08)
: 1402
-1408
.
DOI: 10.3969/j.issn.1006-267x.2011.08.020
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