This experiment was conducted to study the effects of different copper sources on growth performance, nutrient digestibility and blood biochemical parameters of female silver foxes during growth period, and in order to investigate the optimal copper source for the diet of female silver foxes during growth period. Forty female silver foxes with an average body weight of (3 315±11) g were selected and randomly assigned into 4 groups with 10 replicates per group and 1 silver fox per replicate. The silver foxes in the 4 groups were fed the basal diets supplemented with different copper sources, which were glycine chelate copper (group Ⅰ), methionine chelate copper (group Ⅱ), copper sulfate (group Ⅲ ) and citric acid copper (group Ⅳ), respectively. The copper level in the basal diet was 5.47 mg/kg, and the copper supplemental level of all experimental diets was 30 mg/kg (counted with copper). The experiment included an adaptation period for 7 days and a test period for 45 days. The results showed as follows: different copper sources had significant effects on final weight, average daily gain (ADG) and feed to gain ratio (F/G) (P<0.05), but had no significant effect on average daily feed intake (ADFI) (P>0.05). The finial weight and ADG in the group Ⅳ were significantly higher than those in the group Ⅲ (P<0.05), and the F/G in the group Ⅳwas significantly lower than that in the group Ⅱ (P<0.05). Different copper sources had no significant effect on digestibility of dry matter, protein and fat (P<0.05). There were no significant differences in serum total protein (TP), urea nitrogen (UN), immunoglobulin G (IgG), immunoglobulin M (IgM), ceruloplasmin (CP) contents and alkaline phosphatase (ALP) activity among all groups (P>0.05), but the UN content and ALP activity in the group Ⅳ were all higher than those in the other groups. Different copper sources had significant effects on serum albumin (ALB) content and superoxide dismutase (SOD) activity (P<0.05), and had a extremely significant effect on serum Cu/Zn-SOD activity (P<0.01). The serum ALB content in the group Ⅳ was significantly higher than that in the other groups (P<0.05), the serum SOD activity in the group Ⅰ was significantly higher than that in the groups Ⅱ and Ⅲ (P<0.05), and Cu/Zn-SOD in the groups Ⅰ and Ⅲ was extremely significantly higher than that in the group Ⅱ (P<0.05). Under this study conditions, on the basis of comprehensive consideration of the growth performance, nutrient digestibility and blood biochemical parameters, the optimal dietary copper source is citric acid copper for female silver foxes during growth period.
ZHONG Wei
,
LIU Fenghua
,
ZHAO Jingbo
,
ZHANG Tietao
,
CHANG Zhongjuan
,
BAO Kun
,
ZHANG Haihua
,
XU Chao
,
WANG Xiguo
,
LI Guangyu
. Effects of Different Copper Sources on Growing Performance, Nutrient Digestibility and Blood Biochemical Parameters of Female Silver Foxes during Growth Period[J]. Chinese Journal of Animal Nutrition, 2013
, 25(10)
: 2489
-2496
.
DOI: 10.3969/j.issn.1006-267x.2013.10.033
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