›› 2018, Vol. 45 ›› Issue (11): 3051-3061.doi: 10.16431/j.cnki.1671-7236.2018.11.010

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Effects of Dietary Vitamin D and Calcium Levels on Growth Performance, Nutrient Digestibility, Metabolisms of Nitrogen, Ca and P of Minks During Winter Fur-growing Period

WANG Jing, ZHANG Haihua, CAI Xiheng, ZHANG Xuelei, XU Yinan, LI Rende, LI Guangyu   

  1. Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun 130112, China
  • Received:2018-05-14 Online:2018-11-20 Published:2018-11-20

Abstract:

The aim of this experiment was to investigate the effects of dietary vitamin D and calcium levels on growth performance,nutrient digestibility and metabolisms of nitrogen,calcium and phosphorus of winter fur-growing mink at a fixed ratio of calcium to phosphorus.One hundred and seventeen healthy male minks at the age of (135±5) days were randomly divided into 9 groups with 13 replicates per group and 1 mink per replicate.Nine experimental diets were formulated by using 3×3 double factorial experiment design.Dietary calcium to phosphorus ratio was fixed at 1.7:1,and three vitamin D levels were 2 300,4 300 and 6 300 IU/kg,respectively,while three calcium levels were 2.0%,2.4% and 2.8%,respectively.The levels of vitamin D and calcium in the 9 diets were 2 300 IU/kg and 2.0% (group Ⅰ),4 300 IU/kg and 2.0% (group Ⅱ),6 300 IU/kg and 2.0% (group Ⅲ),2 300 IU/kg and 2.4% (group Ⅳ),4 300 IU/kg and 2.4%(group Ⅴ),6 300 IU/kg and 2.4% (group Ⅵ),2 300 IU/kg and 2.8% (group Ⅶ),4 300 IU/kg and 2.8% (group Ⅷ),6 300 IU/kg and 2.8% (group Ⅸ).The pretrial lasted for 13 days,and the formal trial lasted for 60 days.The results showed as follows:①There was a extremely significant difference of F/G in mink among groups (P<0.01),and that in group Ⅱ was the lowest.The calcium levels had a significant effect on the F/G (P<0.05),while the vitamin D levels had an extremely significant effect on the F/G (P<0.01).②The calcium levels had an extremely significant effect on fat digestibility (P<0.01),and that of 2.8% calcium level was extremely significantly lower than 2.0% and 2.4% calcium levels (P<0.01).②The dietary levels of vitamin D and calcium had no significant effect on nitrogen metabolism indexes of mink (P>0.05).④There was an extremely significant difference in the fecal calcium,fecal phosphorus,calcium digestibility and phosphorus digestibility of mink among the groups (P<0.01).The digestibility of calcium and phosphorus were the highest in group Ⅱ,followed by group Ⅲ.The calcium level had an extremely significant effect on fecal calcium,fecal phosphorus,digestibilities of calcium and phosphorus (P<0.01),and 2.0% calcium level extremely significantly decreased fecal calcium and fecal phosphorus contents (P<0.01),and increased calcium and phosphorus digestibilities (P<0.01).Vitamin D levels had a significant effect on calcium digestibility (P<0.05), and had an extremely significant effect on fecal phosphorus and phosphorus digestibility (P<0.01).Vitamin D levels of 2 300 to 4 300 IU/kg could increase digestibilities of calcium and phosphorus,reduce the fecal phosphorus content.Comprehensive analysis of various indicators,when the dietary calcium to phosphorus ratio was 1.7:1,the vitamin D level was 2 300 to 4 300 IU/kg,and the calcium level was 2.0%,minks during winter fur-growing period could get a lower F/G,calcium and phosphorus emissions,higher EE,calcium and phosphorus digestibility.

Key words: vitamin D; calcium; phosphorus; mink; growth performance; nitrogen metabolism

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