China Animal Husbandry and Veterinary Medicine ›› 2023, Vol. 50 ›› Issue (11): 4454-4462.doi: 10.16431/j.cnki.1671-7236.2023.11.014

• Nutrition and Feed • Previous Articles     Next Articles

Effects of Soy Isoflavone on Laying and Reproductive Performance, Plasma Biochemical Indices of Lingnan Yellow-feathered Broiler Breeder Hens

LIN Xiajing, GOU Zhongyong, FAN Qiuli, YE Jinling, WANG Yibing, JIANG Shouqun   

  1. Institute of Animal Science, Guangdong Academy of Agricultural Sciences, State Key Laboratory of Livestock and Poultry Breeding, Key Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture and Rural Affairs, Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, China
  • Received:2023-05-23 Online:2023-11-05 Published:2023-10-27

Abstract: 【Objective】 The experiment was to study the effects of dietary soy isoflavone (SIF) on laying performance, egg quality, reproductive organ development, hatching performance and plasma biochemical indices of Yellow-feathered broiler breeder hens during laying period, in order to provide data reference for application of soy isoflavone in broiler hens.【Method】 One hundred and ninety-two healthy 21-week-old LingnanYellow-feathered broiler breeder hens were randomly assigned to 4 groups.Each group had 6 replicates with 8 hens per replicate.Broilers in control group were fed basal diet, and groups 2 to 4 were supplemented with SIF in the basal diet, and the supplemental levels were 5, 15 and 25 mg/kg, respectively.The experiment lasted for 10 weeks from 25 to 35 weeks of age.During the experiment, the daily feed intake, egg number and egg weight were repeatedly recorded.At 34 to 35 weeks of age, 50 eggs in each group were selected for incubation to determine the hatching performance.At 35 weeks of age, 24 eggs were randomly selected from each group for egg quality measurement, and 2 chickens from each replicate were selected for blood and sample collection to determine reproductive organ development and plasma biochemical indices.【Result】 SIF had no significant effects on laying rate, average egg weight, daily egg weight and ratio of feed to egg of Yellow-feathered breeder hens (P>0.05).Dietary SIF significantly reduced the unqualified egg rate, and it was significantly lower in 25 mg/kg SIF group than that in control group (P<0.05).Dietary SIF significantly improved eggshell strength and yolk color, and yolk color in SIF 5 and 25 mg/kg groups were significantly higher than that in control group (P<0.05), the eggshell strength of SIF 5 mg/kg group was significantly higher than that of control group (P<0.05).Dietary SIF significantly reduced the percentage of abdominal fat, and it was significantly lower in SIF 25 mg/kg group than that in control group (P<0.05).Dietary SIF significantly reduced the contents of malondialdehyde (MDA) and cholesterol (CHO), while increased the activity of glutathioneperoxidase (GSH-Px) in plasma, and the content of MDA in 25 mg/kg SIF group was significantly lower than that in control group. The content of CHO in 5 and 15 mg/kg SIF group were significantly lower than that in control group, and the activities of GSH-Px in 5, 15 and 25 mg/kg SIF groups were significantly higher than that in control group (P<0.05).【Conclusion】 Dietary SIF could reduce unqualified egg rate, improve egg quality, reduce abdominal fat percentage, decrease the contents of MDA and CHO, increase the activity of GSH-Px in plasma.The suitable supplemental level of SIF in laying period of Yellow-feathered broiler breeder hens was 25 mg/kg.

Key words: Yellow-feathered broiler breeder hens; soy isoflavone; reproductive organ; egg quality; hatching performance

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