ORIGINAL PAPER
 
KEYWORDS
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ABSTRACT
Selenium is an essential trace element for pig growth; generally, inorganic or organic selenium is used for dietary selenium supplementation. Newborn piglets obtain all nutrients from the sow; thus, the sow absorption rate of different selenium sources significantly affects sow reproductive performance and piglet development. Therefore, a meta-analysis was performed to provide insights into whether organic selenium is better than mineral selenium for improving sow reproductive performance and piglet development. The present study investigated the effects of different selenium sources in sow feed using articles published between June 1, 1980, and December 31, 2020, from four databases. In the meta-analysis, 19 articles (347 sows) from seven countries were included. It was shown that feeding organic selenium to sows during pregnancy significantly increased newborn piglet weight (P < 0.05), piglet weight at weaning (P < 0.05), litter weight at weaning (P < 0.01), selenium content in sow colostrum (P < 0.01), milk (P < 0.01) and serum (P < 0.01); and selenium content (P < 0.01) and glutathione peroxidase activity (P < 0.05) in piglet serum. However, it had no effect on the number of live-born piglets and litter weight at birth. Owing to study heterogeneity (I2 > 50%), we hypothesized that the sow breed or weaning age were the influencing factors. Publication bias and sensitivity analyses indicate that the present results are robust. Further research is needed to better understand how different selenium sources affect sow reproduction and piglet development.
FUNDING
A project was funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
CONFLICT OF INTEREST
The authors declare that there is no conflict of interest.
 
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