ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (6): 1194-1203.doi: 10.11843/j.issn.0366-6964.2018.06.011

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Effects of Dietary N-carbamoylglutamate on Growth Performance, Nutrient Digestibility, Nitrogen Metabolism and Serum Biochemical Indexes of Growing Mink

DONG Xiao-jing1, CUI Kai1, MA Ze-fang1*, LI Jian-dong1, LI Ying-mei2   

  1. 1. College of Animal Science and Veterinary Medicine, Qingdao Agricultural University, Qingdao 266109, China;
    2. Company of HLINTE Biological Technology, Tianjin 301702, China
  • Received:2017-07-28 Online:2018-06-23 Published:2018-06-23

Abstract:

This study was conducted to study the effects of different dietary N-carbamoylglutamate (NCG) levels on growth performance, nutrient digestibility, nitrogen metabolism and serum biochemical indexes of growing minks. One hundred and fifty healthy weaned Black minks(Mustela vison) with similar body weight were selected and randomly divided into 5 groups with 30 replicates per group and one mink per replicate. These minks were fed with NCG supplementation levels of 0% (group A), 0.02% (group B), 0.06% (group C), 0.10% (group D) and 0.14% (group E), respectively in the experimental diets, NCG was added from June 8th to September 15th. The pre-trial lasted for 7 days and the trial for 92 days. From September 12th, 10 minks (5 male and 5 female) were selected from each group for digestion and metabolism test for 3 days, muck method determination of feed and feces were conducted to measure the contents of dry matter (DM), crude protein (CP) and crude fat (EE) and then to calculate the apparent digestibility and nitrogen metabolism. On the morning of September 15th, 6 minks(3 male and 3 female) were selected from each group. Blood was collected and the contents of arginine (Arg), nitric oxide (NO), growth hormone (GH), total protein (TP), alanine aminotransferase (ALT), aspartate aminotransferase(AST), immunoglobulin A (IgA), immunoglobulin G (IgG), immunoglobulin M (IgM), complement 3 (C3), complement 4 (C4) in serum were determined by ELISA. The results showed that:1) The final weight and average daily gains of female minks fed with NCG were all higher than the control group, that of female minks in group B were the highest, but the differences were not significant between different groups (P>0.05). These indicators of male minks in group B was significantly higher than group A, C and E (P<0.05). The feed/gain of female minks in group B was the lowest, but the differences were not significant between different groups (P>0.05), the feed/gain of male minks in group B was significantly lower than A and E groups (P<0.05). 2) The digestibility of dry matter, crude protein and crude fat of minks fed with NCG were all higher than the control group, but the differences were not significant between different groups (P>0.05). 3) There were no significant differences in nitrogen deposition, net protein utilizable rate and biological value of protein between different groups (P>0.05), but compared with group A, the nitrogen deposition of D group and the net protein utilizable rate, biological value of protein of B group were higher. 4) Compared with group A, the levels of arginine, nitric oxide, growth hormone, total protein, IgA, IgG, IgM, C3 and C4 in serum of minks fed with NCG extremely significantly increased (P<0.01), and group B was all the best, the alanine aminotransferase and aspartate aminotransferase extremely significantly decreased (P<0.01). The results indicated that basal diet supplemented with 0.02% NCG could help the growing minks to gain the average daily weight, reduce the feed/gain, improve the nitrogen deposition, net protein utilizable rate and biological value of protein, and increase the levels of arginine, growth hormone, total protein and immunoglobulin in serum.

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