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• W2394201734 abstract "This experiment was conducted to study the effects of dietary copper( Cu) and zinc( Zn) supplemental level on grow th performance,nutrient digestibility and nitrogen metabolism of grow ing blue foxes. The experiment used a 2×3 completely randomized experimental design. Experimental diets w ere supplemented w ith2 Zn levels( 40 and 120 mg /kg) and 3 Cu levels( 30,45 and 60 mg /kg),respectively. The control group's diet w as supplemented w ith 0 mg /kg Cu and 40 mg /kg Zn. Eighty four healthy male blue foxes at the age of( 55±5) days were randomly assigned into 7 groups with 12 replicates per group and 1 fox per replicate.The pre-trial period lasted for 7 days and the trial period lasted for 75 days. The results show ed as follow s: 1) dietary supplemented w ith Cu w as tended to improve the average daily gain( ADG)( P = 0.06) and reduce the ratio of feed to gain( F /G)( P = 0.08) of blue foxes,how ever,there w as no interaction in ADG and F /G betw een Cu and Zn( P0.05). The ADG in 30 mg /kg Cu+ 40 mg /kg Zn and 45 mg /kg Cu+ 120 mg /kg Zn groups w as significantly higher than that in control group( P0.05),but the F /G w as significantly low er than that in control group( P 0.05). 2) Dietary supplemented w ith Cu significantly increased the digestibility of protein and fat( P0.01). The protein digestibility in 60 mg /kg Cu+40 mg /kg Zn,60 mg /kg Cu+120 mg /kg Zn and 45 mg /kg Cu+120 mg /kg Zn groups w as significantly higher than that in control group( P0.05 or P0.01). The fat digestibility in 30 mg /kg Cu+40 mg /kg Zn,45 mg /kg Cu+40 mg /kg Zn,30 mg /kg Cu+120 mg /kg Zn,60 mg /kg Cu + 120 mg /kg Zn and 45 mg /kg Cu + 120 mg /kg Zn groups w as significantly higher than that in control group( P0.05 or P0.01). Dietary Cu and Zn supplemental level significantly affected the Cu output in faeces( P0.01),dietary Zn supplemental level significantly affected the Zn output in faeces( P0.01). There w as no interaction in Cu output and Zn output betw een Cu and Zn( P0.05). 3) Dietary supplemented w ith Cu significantly decreased the fecal nitrogen content( P 0.01). Dietary Cu and Zn supplemental levels had no significant effects on nitrogen intake,urine nitrogen,nitrogen retention,net protein utilization and biological value of protein( P0.05). In conclusion,dietary supplemented w ith 30 mg /kg Cu+40 mg /kg Zn( total Cu and total Zn levels w ere 37. 68 and 80. 08 mg /kg,respectively) can improve the grow th performance and nutrient digestibility of grow ing blue fox. Meanw hile,it also can reduce the nitrogen excretion in faeces." @default.
• W2394201734 created "2016-06-24" @default.
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• W2394201734 date "2014-01-01" @default.
• W2394201734 modified "2023-09-28" @default.
• W2394201734 title "Effects of Dietary Copper and Zinc Supplemental Levels on Growth Performance,Nutrient Digestibility and Nitrogen Metabolism of Growing Blue Foxes" @default.
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