[1]Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry;
College of Animal Science and Veterinary Medicine;
Tianjin Agricultural University;
Tianjin 300384;
China;
[1]Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry;
College of Animal Science and Veterinary Medicine;
Tianjin Agricultural University;
Tianjin 300384;
China;
[1]Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry;
College of Animal Science and Veterinary Medicine;
Tianjin Agricultural University;
Tianjin 300384;
China;
[1]Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry;
College of Animal Science and Veterinary Medicine;
Tianjin Agricultural University;
Tianjin 300384;
China;
[1]Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry;
College of Animal Science and Veterinary Medicine;
Tianjin Agricultural University;
Tianjin 300384;
China;
[1]Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry;
College of Animal Science and Veterinary Medicine;
Tianjin Agricultural University;
Tianjin 300384;
China;
[1]Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry;
College of Animal Science and Veterinary Medicine;
Tianjin Agricultural University;
Tianjin 300384;
China;
Probiotics; Enzymic preparation; Laying hens; Yolk cholesterol; Triglyceride; ALT; POD;