Effects of Dietary Copper Supplemental Level on Performance, Reproduction Performance, Egg Quality and Serum Biochemical Parameters of Breeding Geese during Laying Period
DAI Guotao, WANG Baowei, GE Wenhua, ZHANG Ming'ai, YUE Bin, KONG Min, SHI Jing, WANG Hefei, SUI Fuliang
Nutrition and Feed Laboratory of China Agriculture Research System, Institute of High Quality Waterfowl, Qingdao Agricultural University, Qingdao 266109, China
Abstract:This experiment was conducted to study the effects of dietary copper supplemental level on performance, reproduction performance, egg quality and serum biochemical parameters of breeding geese during laying period. A total of 120 thirty-three-week-old breeding geese with the similar body condition were randomly divided into 6 groups with 4 replicates per group and 5 geese per replicate (1 male and 4 female). Geese in the 6 groups (groups Ⅰ to Ⅵ) were fed basal diets supplemented with 0, 4, 6, 8, 10 and 12 mg/kg copper, respectively. The pre-experimental period lasted for 1 week, and the experimental period lasted for 10 weeks. The results showed as follows: 1) the weekly egg production of groups Ⅲ, Ⅳ and Ⅴ was significantly higher than that of group Ⅰ (P<0.05 or P<0.01), the laying rate of group Ⅲ was significantly higher than that of groups Ⅰ, Ⅳ, Ⅴ and Ⅵ (P<0.05 or P<0.01), the average daily feed intake of groups Ⅴ and Ⅵ was significantly lower than that of group Ⅰ (P<0.05), and the feed to egg ratio of groups Ⅲ and Ⅵ was significantly lower than that of groups Ⅰ and Ⅳ (P<0.05 or P<0.01). 2) The hatching egg qualified rate of groups Ⅲ, Ⅳ and Ⅴ was significantly higher than that of groups Ⅰ, Ⅱ and Ⅵ(P<0.05 or P<0.01), the hatching egg fertilization rate of groups Ⅲ, Ⅳ, Ⅴ and Ⅵ was significantly higher than that of groups Ⅰ and Ⅱ (P<0.05 or P<0.01), the hatching egg hatching rate of groups Ⅲ, Ⅳ and Ⅴ was significantly higher than that of groups Ⅰ and Ⅱ (P<0.05 or P<0.01), and the healthy rate of groups Ⅲ, Ⅳ and Ⅴ was significantly higher than that of groups Ⅰ, Ⅱ and Ⅵ(P<0.05 or P<0.01). 3) Dietary copper supplemental level had no significant effects on egg weight, egg shape index, egg specific gravity, eggshell thickness, yolk ratio, albumen height, Haugh unit and yolk color (P>0.05). The eggshell strength of groups Ⅱ, Ⅲ Ⅳ, Ⅴ and Ⅵ was significantly higher than that of group Ⅰ (P<0.05). 4) The serum total protein content of group Ⅲ was significantly higher than that of group Ⅰ (P<0.05), the serum alkaline phosphatase activity of group Ⅴ was significantly higher than that of group Ⅰ (P<0.05), and the serum urea nitrogen content of groups Ⅴ and Ⅵ was significantly higher than that of groups Ⅰ, Ⅱ, Ⅲ and Ⅳ (P<0.05 or P<0.01). In conclusion, dietary suitable copper supplemental level has significant effects on performance, reproductive performance and eggshell strength of breeding geese during laying period; it is suggested that the dietary copper supplemental level of breeding geese during laying period is 5.75 to 7.17 mg/kg.
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DAI Guotao, WANG Baowei, GE Wenhua, ZHANG Ming'ai, YUE Bin, KONG Min, SHI Jing, WANG Hefei, SUI Fuliang. Effects of Dietary Copper Supplemental Level on Performance, Reproduction Performance, Egg Quality and Serum Biochemical Parameters of Breeding Geese during Laying Period. Chinese Journal of Animal Nutrition, 2019, 31(5): 2136-2143.
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