This study aimed to investigate the effects of different levels of calcium and phosphorus of supplementary concentrate on growth performance, serum biochemical indices and bone composition of lambs fed low quality roughages in pastoral areas of Inner Mongolia during winter and spring season. Ninety-six healthy Ujumuqin weaner lambs (half male and half female) aged (30±2) days with body weight of (12.50±1.21) kg were assigned to one of three groups with 32 lambs per group using single factor experimental design. Lambs were offered supplementary concentrate with different levels of calcium and phosphorus (group A: calcium 0.40% and phosphorus 0.38%; group B: calcium 0.50% and phosphorus 0.48%; group C: calcium 0.68% and phosphorus 0.65%). The experiment lasted for 55 d including 5 d of pre-experiment and 50 d of experiment. The results showed as follows: average daily gain (ADG) of three groups was very similar with an approximate value of 200 g/d. ADG and total feed intake were not significantly affected by supplementary concentrate with different levels of calcium and phosphorus (P>0.05). On day 50, serum phosphorus content of group C was significantly higher than that of groups A and B (P<0.05). The contents of serum calcium and parathyroid hormone, and the activity of alkaline phosphatase did not differ significantly among groups (P>0.05). Calcium content in tibia of group C was significantly higher than that of group A (P<0.05), and was not significantly different from that of group B(P>0.05), whereas no significant difference was observed in phosphorus content in tibia among groups (P>0.05). The results indicate that calcium and phosphorus levels of supplementary concentrate have no significant effects on growth performance, parts of serum biochemical indices and phosphorus content in tibia of Ujumuqin lambs in pastoral areas of Inner Mongolia during winter and spring season; calcium and phosphorus at 0.40 % and 0.38 % of supplementary concentrate, respectively, can met the requirement for growth, while high levels of calcium and phosphate input may contribute to resource waste and environment pollution.
SI Bingwen
,
WANG Jie
,
ZHANG Fan
,
ZHANG Naifeng
,
MA Tao
,
DIAO Qiyu
,
CHAO Lumeng
,
XU Wenli
,
SUO Qiongyu
,
TU Yan
. Effects of Calcium and Phosphorus Levels of Supplementary Concentrate on Growth Performance, Serum Biochemical Indices and Bone Composition of Lambs in Pastoral Areas during Winter and Spring Season[J]. Chinese Journal of Animal Nutrition, 2016
, 28(9)
: 2742
-2748
.
DOI: 10.3969/j.issn.1006-267x.2016.09.011
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