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本試驗(yàn)的主要目的在于研究哺乳母豬日糧中（有豆油或無豆油）添加硬脂酰乳酸鈉對(duì)生產(chǎn)性能、消化率、乳組成及乳中脂滴大小的影響。試驗(yàn)選用60頭母豬（大白×長白），隨機(jī)分為4組，試驗(yàn)為2（豆油添加量0%或3%）×2（0%或0.1%硬脂酰乳酸鈉）雙因素試驗(yàn)設(shè)計(jì)。每個(gè)處理15頭母豬（1頭母豬1個(gè)重復(fù)）。哺乳期間，添加豆油和硬脂酰乳酸鈉組母豬背膘厚度損失較少（P＜0.05）。與未添加豆油組相比，日糧中添加3%豆油采食量較低（P＜0.05），但是對(duì)能量攝入量和發(fā)情間隔沒有明顯影響，并且與添加日糧硬脂酰乳酸鈉沒有明顯互作（P＞0.05）。添加豆油和硬脂酰乳酸鈉組對(duì)粗脂肪的消化率要高于只添加豆油組母豬（P＜0.05）。此外，添加豆油和硬脂酰乳酸鈉組母豬對(duì)粗蛋白、鈣磷的消化率也高于其它組（P＜0.05）。添加豆油和硬脂酰乳酸鈉組母豬哺乳第11天時(shí)乳脂、乳蛋白和總固形物含量高于其它組（P＜0.05）。同時(shí)豆油和硬脂酰乳酸鈉對(duì)乳脂和總固形物含量有互作。日糧中添加0.1%硬脂酰乳酸鈉可以顯著降低哺乳第11天乳中脂肪顆粒平均粒徑（P＜0.05）。日糧處理對(duì)母豬血漿中膽固醇、甘油三酯、高密度脂蛋白膽固醇、低密度脂蛋白膽固醇無顯著影響。總之，哺乳母豬日糧中添加0.1%硬脂酰乳酸鈉可能降低乳中脂滴的大小，并改善母豬消化率和乳汁組成。

The objective of this study was to determine the effects of feeding sodium stearoyl-2-lactylate (SSL) as a new feeding emulsifier diet with and without soybean oil (SO) on the milk fat globule (MFG) size, milk composition, digestibility of nutrients, and performance in lactating sows. Sixty sows (Large White × Landrace) were randomly assigned to 1 of 4 treatments according to a 2 × 2 factorial arrangement of treatments. Each treatment had 15 replicates composed of 1 sow. The factors included 1) the fat level (0% vs. 3% SO) and 2) the emulsifier content (0% vs. 0.1% SSL). Treatments included 1) Control (without SO and SSL), 2) SO (3% SO without SSL), 3) SSL (0.1% SSL without SO), and 4) SO + SSL (3% SO and 0.1% SSL). During the suckling period, sows in the SO + SSL group lost less back fat thickness (P< 0.05) compared to other groups; sows fed 3% SO diets consumed less feed (P< 0.05) compared to sows fed diets without SO, but there were no significant effects (P > 0.05) of dietary fat and its interaction with a dietary emulsifier on energy intake and the weaning-estrus interval. The digestibility of ether extract in the SO + SSL group was greater than in the SO group (P <0.05). Moreover, greater digestibility of CP, Ca, and P in the SO+SSL group was observed compared to that of other groups (P < 0.05). Feeding the SO + SSL diet improved the concentrations of milk fat, protein, and total solids on d 11 of lactation compared to other diets (P < 0.05). Also, an interaction between supplemental SSL and SO was observed for the milk fat and total solids concentrations. The average diameter of MFG on d 11 of lactation was significantly decreased by the addition of 0.1% SSL compared to a diet with no SSL supplementation (P < 0.05). No significant differences among the dietary treatments were observed in cholesterol, triglyceride, high-density lipoprotein cholesterol, or low-density lipoprotein cholesterol in sows’ plasma (P >0.05). In conclusion, feeding a 0.1% SSL diet to lactating sows may decrease the average diameter of MFG and improve the digestibility of nutrients and composition of milk.

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