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

翻译&校正：上海亘泰实业集团

      试验选用430头母猪评估标准回肠可消化（SID）缬氨酸（Val）：赖氨酸（Lys）水平对母猪和小猪在18.6d哺乳期生产性能的影响。日粮SID Val：Lys水平的设置基于前人的研究结果，在其上下设置不同水平。

      根据胎次（第一、二胎、经产）将母猪随机分为5个处理组，日粮为玉米豆粕型哺乳期配方，5个处理组SID Val：Lys水平分别为0.50、0.62、0.75、0.88、1.00。所有日粮均为3.35Mcal/kg代谢能、0.95%SID Lys，日粮中维生素和矿物元素均超过NRC（2012）的推荐量。试验日粮从妊娠第112d开始饲喂，直至23d哺乳期结束。分娩后48h内对仔猪进行调圈。母猪用Howema电脑喂养系统喂养，将高低水平日粮混合以产生中间日粮，称重每头母猪的饲料，然后将饲料输送到每个单独的喂食料斗，以记录哺乳期间每天母猪的采食量。 使用SAS的PROC MIXED程序将数据分析为随机完全区组设计，其中母猪作为实验单位，处理作为固定效应，胎次作为随机效应。P≤0.05视为差异显著，P＞0.05并≤0.10视为有差异的趋势。

      数据显示，不同处理组间母猪采食量没有显著差异（分别为5.2、5.2、5.2、5.0、5.4 ± 0.15 kg/d）。平均下来母猪日摄入SID Lys量约为45g。母猪断奶后发情间隔分别为5.2、4.7、5.3、5.5、4.5±0.32d，不同处理组之间没有显著差异。提高SID Val：Lys水平对仔猪窝平均日增重没有显著影响，分别为2.66、2.64、2.76、2.61、2.62±0.08kg，P> 0.10。不同处理之间母猪体重损失和下一胎总产仔数没有显著影响。

      总之，提高SID Val：Lys水平对母猪繁殖性能和仔猪生长速度没有显著影响。

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.（转自：猪营养国际论坛）