Abstract: To study the effects of selenium yeast and inorganic selenium on reproductive performance of sows in different varieties, and provide scientific basis for the reasonable application of selenium yeast and study on selenium deposition, each 18 Landrace sows and Tibet sows were fed in diets adding 0.3 mg/kg sodium selenite and 0.2, 0.5 mg/kg of selenium yeast. The effects of selenium yeast on the reproduction performance, selenium deposition in milk and in organization of suckling piglets were studied. The results showed that selenium yeast had improvement effect on the reproductive performance of sows, compared with the sodium selenite, selenium yeast could significantly increased the selenium deposition in colostrum, milk and piglet tissues, especially in muscle, different varieties sow had different demand for selenium yeast, selenium deposition had different rules in different varieties.

Key words: sow; selenium yeast; sodium selenite; reproduction performance; selenium deposition