铜对育成期乌苏里貉生长性能、营养物质消化率的影响

doi:10.16431/j.cnki.1671-7236.2020.06.013

Abstract

Abstract: This experiment was investigated to study the effects of dietary copper on the growth performance,nutrient digestibility,nitrogen,copper metabolism and serum biochemical indexes of male raccoon dog.105 healthy male raccoon dogs with (60±5) days old whose body weight was (2.83±0.37) kg were randomly divided into 7 groups with 15 replicates per group and 1 raccoon dog per replicate.The raccoon dogs were fed 7 diets with different copper supplemental levels,0 (control group),20 (group Ⅰ),30 (group Ⅱ),40 (group Ⅲ),50 (group Ⅳ),60 (group Ⅴ) and 200 mg/kg (group Ⅵ).The pre-test period lasted for 7 d and the trial period lasted for 55 d.During the experiment,8 raccoon dogs in each group were randomly selected for digestion and metabolism test by total fecal and urine collection.The results showed as follows:The final weight in the group Ⅲ and Ⅳ were significantly higher than control group (P<0.05).There was no significant difference in body weight between the other groups and control group.The average daily gain (ADG) in the groupsⅠ,Ⅱ,Ⅲ,Ⅳ,Ⅴand Ⅵ were significantly higher than control group (P<0.05).The fat digestibility in the group Ⅴ was significantly higher than that in the group Ⅰ and control group (P<0.05).The copper digestibilities in control group and group Ⅵ were significantly higher than that in the groups Ⅰ,Ⅱ,Ⅲ,Ⅳ and Ⅴ (P<0.05).The nitrogen deposition in the group Ⅳ was significantly higher than that in the group Ⅰ and control group (P<0.05).There were significant difference in copper intakes between the two groups (P<0.05).The fecal copper contents increased with the increase of copper intake (P<0.05).The urinary copper in the groups Ⅴ and Ⅵ was significantly higher than that in the group Ⅰ,Ⅱ,Ⅲ,Ⅳ and control group (P<0.05).There was significant difference in copper deposition between each copper addition group and control group (P<0.05).The serum low density lipoprotein (LDL) in the group Ⅵ was significantly higher than that in the groups Ⅰ and control group (P<0.05).The serum albumin (ALB) in the groups Ⅱ,Ⅲ,Ⅳ,Ⅴ and Ⅵ were significantly higher than control group (P<0.05).The serum urea in the groups Ⅳ was significantly lower than control group (P<0.05).It was concluded that the dietary copper supplemental level arrives at 30 to 50 mg/kg,the growth performance was better.In order to reduce copper emissions,protect the environment and reduce the cost of feeding,it was recommended to add 30 mg/kg in practice.

Key words: copper; raccoon dog; growth performance; nutrient digestibility

CLC Number:

S816.72

ZHANG Xinyu, ZHANG Haihua, LIU Hanlu, ZHONG Wei, SI Huazhe, HAN Feifei, CAI Xiheng, LI Guangyu. Effects of Dietary Copper on Growth Performance,Nutrient Digestibility of Growing Raccoon Dog[J]. China Animal Husbandry and Veterinary Medicine, 2020, 47(6): 1750-1758.

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Effects of Dietary Copper on Growth Performance,Nutrient Digestibility of Growing Raccoon Dog

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