Effect of dietary calcium and phosphorus on growth, blood metabolites, and digestion in Chahaer lambs in Inner Mongolia

doi:10.11686/cyxb2016137

Abstract

Abstract: The present study was conducted to investigate the effect of dietary calcium (Ca) and phosphorus (P) on growth performance, digestibility and output of Ca and P, and bone characteristics of weaned Chahaer lambs. 120 weaned Chahaer lambs [liveweight (16.3±3.3) kg; age 70 days] were randomly assigned into 4 groups: Ca and P levels in the diets of group Ⅰ, Ⅱ, Ⅲ and Ⅳ were 0.49% and 0.28%, 0.55% and 0.32%, 0.64% and 0.47% and 0.87% and 0.70%, respectively. The feeding trial lasted for 65 days; 6 lambs (3 male and 3 female) were randomly selected to be slaughtered from every group to collect data on Ca and P metabolism and digestion. The results showed that dietary Ca and P levels had no effect on liveweight gain, dry matter intake and feed conversion (P>0.05). Blood serum Ca content in group Ⅳ was the highest among the four groups (P<0.05), whereas serum alkaline phosphatase in group Ⅰ was higher than other three groups (P<0.05). The apparent digestibility of Ca in group Ⅰ was significantly higher than other three groups (P<0.05). Ca and P outputs were significantly increased with increasing dietary Ca and P levels (P<0.05). The tibia ash and P content from lambs in group Ⅳ was significantly higher than that in group Ⅰ (P<0.05) and the metatarsal ash content in group Ⅰ was lower than those in group Ⅲ and Ⅳ (P<0.05). Increased Ca and P in the diet of lambs increased Ca and P input into the grassland during winter and spring. It was concluded that increased Ca and P levels in the diet of weaned lambs reduced the apparent digestibility of Ca but significantly increased the Ca and P content in the feces and bones. Optimal levels of Ca and P in the diet of weaned Chahaer lambs was 0.49% and 0.28% respectively.

HU Feng-Ming, SI Bing-Wen, ZHANG Bo, Siqinbateer, Sarenhua, Sudebilige, JIN Hai, DIAO Qi-Yu, TU Yan. Effect of dietary calcium and phosphorus on growth, blood metabolites, and digestion in Chahaer lambs in Inner Mongolia[J]. Acta Prataculturae Sinica, 2017, 26(3): 100-110.

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