Laura Greiner，Amanda Graham，Marcio Goncalves，Uislei Orlando，Kevin J Touchette

翻譯&校正：上海亙泰實業集團

      試驗選用430頭母豬評估標準回腸可消化（SID）纈氨酸（Val）：賴氨酸（Lys）水平對母豬和小豬在18.6d哺乳期生產性能的影響。日糧SID Val：Lys水平的設置基于前人的研究結果，在其上下設置不同水平。

      根據胎次（第一、二胎、經產）將母豬隨機分為5個處理組，日糧為玉米豆粕型哺乳期配方，5個處理組SID Val：Lys水平分別為0.50、0.62、0.75、0.88、1.00。所有日糧均為3.35Mcal/kg代謝能、0.95%SID Lys，日糧中維生素和礦物元素均超過NRC（2012）的推薦量。試驗日糧從妊娠第112d開始飼喂，直至23d哺乳期結束。分娩后48h內對仔豬進行調圈。母豬用Howema電腦喂養系統喂養，將高低水平日糧混合以產生中間日糧，稱重每頭母豬的飼料，然后將飼料輸送到每個單獨的喂食料斗，以記錄哺乳期間每天母豬的采食量。 使用SAS的PROC MIXED程序將數據分析為隨機完全區組設計，其中母豬作為實驗單位，處理作為固定效應，胎次作為隨機效應。P≤0.05視為差異顯著，P＞0.05并≤0.10視為有差異的趨勢。

      數據顯示，不同處理組間母豬采食量沒有顯著差異（分別為5.2、5.2、5.2、5.0、5.4 ± 0.15 kg/d）。平均下來母豬日攝入SID Lys量約為45g。母豬斷奶后發情間隔分別為5.2、4.7、5.3、5.5、4.5±0.32d，不同處理組之間沒有顯著差異。提高SID Val：Lys水平對仔豬窩平均日增重沒有顯著影響，分別為2.66、2.64、2.76、2.61、2.62±0.08kg，P> 0.10。不同處理之間母豬體重損失和下一胎總產仔數沒有顯著影響。

      總之，提高SID Val：Lys水平對母豬繁殖性能和仔豬生長速度沒有顯著影響。

Evaluation of the optimal standardized ileal digestible valine:lysine ratio in lactating sow diets

An experiment was conducted with 430 sows to evaluate the ideal standardized ileal digestible (SID) Val:Lys on sow and litter performance during an 18.6-d lactation period. The SID Val:Lys ratios measured were based on the previously published literature and then values above and below reported values. Sows were randomly allotted within parity block (parity 1, parity 2, and parity 3+) to one of five corn–soybean meal-based lactation diets formulated to contain different levels of SID Val:Lys (0.50, 0.62, 0.75, 0.88, and 1.00, respectively). All diets were formulated to be isocaloric (3.35 ME Mcal/kg) with 0.95% SID Lys and contained vitamins and minerals that exceeded recommendations (NRC, 2012). Experimental diets were given to sows from 112 d of pregnancy throughout the 23-d lactation period. Litters were standardized within 48 h after farrowing. Sows were fed with the Howema computerized feeding system that mixed the high and low diets to create the intermediate diets, weighed the feed for each sow and then delivered the feed to each individual feeding hopper to record daily sow feed intake during lactation. Data were analyzed as a randomized complete block design using the PROC MIXED procedure of SAS with sow as the experimental unit and treatment as a fixed effect and parity as the random effect. Results were considered significant at P ≤ 0.05 and considered a trend at P > 0.05 and P ≤ 0.10. Sow ADFI was not significantly different (5.2, 5.2, 5.2, 5.0, and 5.4 ± 0.15 kg/d, respectively). On average, sows consumed ~45 g of SID Lys per day. Sow wean to estrus (5.2, 4.7, 5.3, 5.5, and 4.5 ± 0.32 d, respectively) was not different as the Val:Lys ratio changed. Increasing the Val:Lys ratio resulted in no differences (2.66, 2.64, 2.76, 2.61, and 2.62 ± 0.08 kg; P > 0.10) in average daily litter gain. There were no differences in sow weight loss or subsequent total born across the dietary treatments. Overall, increasing levels of SID Val:Lys did not change sow reproductive performance or piglet growth rate.（轉自：豬營養國際論壇）