This experiment was conducted to investigate the growth requirements of calcium, natrium, kalium and magnesium for Dorper×Thin-tailed Han crossbred lamb (F1) at 20 to 35 kg. A comparative slaughter trial was used and the lambs were slaughtered at 20, 28 and 35 kg; the contents of calcium, natrium, kalium and magnesium in tissues and organs were determined and mathematical models for predicting mineral requirements were established. The results showed that at the body weight of lambs from 20 to 35 kg, the growth rate of muscle, bone and body fat tissues maintained stable, decreased and increased, respectively, Body mineral contents were highly correlated with empty body weight (EBW) (R2=0.84 to 0.98), and the equations for predicting net growth requirement (NRG) of minerals were: NRGCa=15.26?EBW-0.171, NRGNa=1.67?EBW-0.085, NRGK=1.94?EBW0.023 and NRGMg=0.34?EBW0.051. It is calculated that the Dorper×Thin-tailed Han crossbred lamb (F1) at 20 to 35 kg, the NRG of calcium, natrium, kalium and magnesium expressed as empty body weight gain (EBG) were 8.56 to 9.36 g/kg EBG, 1.15 to 1.20 g/kg EBG, 2.07 to 2.09 g/kg EBG and 0.39 to 0.40 g/kg EBG, and expressed as body weight gain (BWG) were 7.18 to 8.18 g/kg BWG, 0.96 to 1.05 g/kg BWG, 1.76 to 1.81 g/kg BWG and 0.34 g/kg BWG.
JI Shoukun
,
XU Guishan
,
JIANG Chenggang
,
TU Yan
,
MA Tao
,
LOU Can
,
DENG Kaidong
,
DIAO Qiyu
. Growth Requirements of Calcium, Natrium, Kalium and Magnesium for Dorper×Thin-Tailed Han Crossbred Lambs (F1) at 20 to 35 kg[J]. Chinese Journal of Animal Nutrition, 2013
, 25(7)
: 1473
-1479
.
DOI: 10.3969/j.issn.1006-267x.2013.07.011
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