Effects of fat sources in sow on the fatty acid profiles and fat globule size of milk and immunoglobulins of sows and piglets

The purpose of this study was to compare the effects of adding different sources of fat to diets for sows on the performance, milk fatty acid (FA) profiles, fat globule size of milk, and immunoglobulins of sows and piglets during late gestation and lactation. Sixty sows were randomly allotted to four dietary treatments supplemented with 3% soybean oil, 3% coconut oil, 3% palm oil or 3% mixed oil, which included 1% soybean oil, 1% coconut oil and 1% palm oil, respectively, from day 107 of gestation to day 21 of lactation. The coconut oil contained lauric acid (C12); the palm oil contained palmitic acid (C16); and the soybean oil contained linoleic acid (C18). The results showed that supplementation of coconut oil, palm oil, soybean oil and mixed oil in sow had no effects on sow and litter performance (P > 0.05). The addition of soybean oil to the diet increased the fat concentrations in colostrum compared with diets supplemented with palm oil and coconut oil (P < 0.05). No differences between treatments were observed among the immunological variables of the colostrum and milk (P > 0.05). However, the IgG and IgA levels increased in the plasma of sows and day 21 piglets after supplementation with soybean oil compared with diets supplemented with coconut oil and palm oil (P < 0.05). Supplementation with coconut oil decreased the IgG and IgA concentrations in the plasma of sows compared with those of other groups (P < 0.05). When coconut oil was included in the sow diet, increased concentrations of C12:0 and C14:0 were found. The addition of palm oil to the sow diet increased the content of C16:0 in the colostrum and milk (P < 0.05). Increases in the concentrations of C18:2n-6 and C18:3n-3 were more pronounced in the colostrum and milk from sows fed soybean oil than in the colostrum and milk from sows fed other dietary treatments. The pattern of FA in plasma of piglets was similar to that in the sows' milk. Additionally, the sow diet containing soybean oil led to an increased fat globule size, whereas coconut oil and palm oil decreased the fat globule size (P < 0.05). In conclusion, supplementation of soybean oil increased the colostrum fat and C18:2n-6 and C18:3n-3 concentrations as well as enhanced the immunoglobulin levels in the plasma of sows and piglets compared with the effects of supplementation with coconut oil and palm oil. The addition of coconut oil to the sow diet decreased the milk fat globule size, followed by palm oil and soybean oil.