1College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Tianjin 300384, P.R. China
2Department of Animal Science and Technology, Jinling Technology Institution, Nanjing 210038, P.R. China
* Corresponding author: anliuli2003@163.com
ABSTRACT
This study determined the effect of dietary supplementation with selenium enriched yeast on egg selenium levels and egg production of North China laying hens. Healthy 60-week-old hens (n = 160) were randomly divided into four experimental groups and fed a basal diet supplemented with selenium enriched yeast at differing levels: 0.0 mg/kg (control group), 0.3 mg/kg (low-dose group), 0.6 mg/kg (medium-dose group) and 1.2 mg/kg (high-dose group). Each experimental group had four cohorts and each cohort had 10 hens. Experimental diets were fed for 28 d and daily egg production was recorded. Eggs were collected every seven days for determination of egg white, egg yolk and total egg selenium using hydride generation-atomic fluorescence spectrometry. Selenium dietary supplementation significantly increased egg white, egg yolk and total egg levels, as well as daily egg production (P < 0.05). During the study, egg white, egg yolk and total egg selenium, as well as egg production, initially increased for low- and medium-dose groups and then plateaued. In contrast, these parameters initially increased and subsequently decreased for the high-dose group. Increasing levels of selenium supplementation proportionately increased egg white, egg yolk and total egg selenium levels, as well as egg production (P < 0.05). Dietary supplementation with selenium enriched yeast increases the egg white, egg yolk and total egg selenium levels, as well as egg production of North China hens (P < 0.05). This effect increased with increasing levels of supplementation with selenium enriched yeast.
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