Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (8): 2213-2222.doi: 10.11843/j.issn.0366-6964.2021.08.014

• ANIMAL NUTRITION AND FEEDS • Previous Articles     Next Articles

Effects of Lactobacillus paracasei KL1 Preparation on Production Performance, Egg Quality and Cholesterol Content in Eggs of Laying Hens

LI Hao1, LIU Hui1*, ZHANG Hongxing1, XIE Yuanhong1, XIONG Lixia1, LIAN Zhengxing2   

  1. 1. Beijing Key Laboratory of Agricultural Product Detection and Control for Spoilage Organisms and Pesticides, Beijing Laboratory of Food Quality and Safety, Beijing Engineering Laboratory of Probiotics Key Technology Development, Food Science and Engineering College, Beijing University of Agriculture, Beijing 102206, China;
    2. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
  • Received:2020-11-20 Online:2021-08-23 Published:2021-08-21

Abstract: This study aimed to evaluate the effect of microecological preparation of Lactobacillus paracasei KL1 screened from Tibetan kefir, which could significantly reduce serum cholesterol and tolerate the gastrointestinal environment, on production performance, egg quality and cholesterol levels of laying hens producing low cholesterol eggs. A total of 120 30-week-old healthy Nongda No.3 laying hens with similar laying rate were randomly divided into 4 groups with 5 replicates per group, and 6 hens per replicate. Hens in control group were fed the basal diet, hens in low, medium and high dose groups were fed the basal diet supplemented with different doses of Lactobacillus paracasei KL1 microecological preparation(105, 106,107CFU·(hen·d)-1), which lasted for 10 weeks. The production performance of laying hens, egg quality and cholesterol content in eggs were measured and calculated. The results showed that:1) the hen-day laying rate of the laying hens in the medium dose group was significantly higher than that of the control group (P<0.05). 2)Compared with the control group, the eggshell strength, eggshell thickness and serum calcium level of hens in the medium and high dose groups significantly increased (P<0.05), and the relative weight of egg yolk extremely significantly increased (P<0.01). 3)The contents of egg yolk cholesterol and serum TC and TG of hens in the low, medium and high dose groups were extremely significantly lower than that of the control group (P<0.01). The serum HDL-C levels of hens in the high-dose group was extremely significantly higher than those in the control group (P<0.01), and the serum LDL-C levels of hens in the high-dose group was significantly lower than that of in the control group (P<0.05). Lactobacillus paracasei KL1 has significant effects on laying rate, egg quality, egg yolk cholesterol levels and serum cholesterol levels. The results indicate that adding Lactobacillus paracasei KL1 probiotics to the diet can significantly improve the production capacity and eggshell quality of laying hens, and reduce the cholesterol content in eggs. In general, 106 CFU· (hen·d)-1 is the best dosage, which has good application value in the production of low cholesterol eggs.

Key words: Lactobacillus paracasei, laying hen, low cholesterol eggs, production performance, egg quality

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