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本試驗(yàn)旨在研究提高日糧纈氨酸與賴(lài)氨酸比率(Val:Lys)對(duì)高產(chǎn)母豬（帶仔數(shù)超過(guò)12頭）的影響。558頭產(chǎn)后兩天的母豬被隨機(jī)分配飼喂6種日糧，每窩14頭仔豬。日糧Val:Lys分別為0.84、0.86、0.88、0.90、0.95和0.99:1。試驗(yàn)選用558頭母豬，在妊娠108天、產(chǎn)后2天和產(chǎn)后25天（斷奶）記錄每頭母豬的背膘厚（BF）和窩重。從中選擇72頭母豬，測(cè)定產(chǎn)后第17天體重和背膘厚、產(chǎn)后10天和17天時(shí)仔豬窩重，每周采集血液和尿液樣品。日糧Val:Lys不影響窩斷奶仔豬數(shù)(13.0± 1.1頭，P =0.23)。窩平均日增重(2.93± 0.53 kg/d; P = 0.84)、斷奶窩重(P= 0.67)、平均產(chǎn)奶量(11.3± 1.4 kg/d; P = 0.49)、乳脂(P= 0.57)、乳蛋白(P= 0.18)和乳糖(P= 0.20)含量均不受日糧Val:Lys的影響。隨著日糧Val:Lys增加，乳中纈氨酸(P< 0.05)和異亮氨酸(P < 0.01)明顯增加。分娩后2-17天、17-25天和2-25天期間所有處理組母豬體重和背膘厚的變化相似(P> 0.05)。泌乳期，母豬平均體重?fù)p失22.1 ± 12.7 kg，背膘損失2.9± 1.7 mm。血液葡萄糖(P = 0.26)、乳糖(P= 0.95)、尿氮(P= 0.84)、游離脂肪酸(P= 0.24)和肌酐濃度(P= 0.42)，以及肌酐尿素(P= 0.57)、全血氨基酸水平(P> 0.05)均不受日糧Val:Lys影響。結(jié)論，日糧Val:Lys超過(guò)0.84:1對(duì)泌乳母豬代謝和窩產(chǎn)性能沒(méi)有影響。

A study was conducted to investigate the effect of increasing the dietary valine-to-lysine ratio (Val:Lys) for lactating sows weaning more than 12 piglets. Five hundred fifty-eight sows (parity 1 to 4) were allotted to 6 dietary treatments from 2 d post partum, when litters were standardized to 14 piglets. Diets were analyzed to have a total dietary Val:Lys of 0.84, 0.86, 0.88, 0.90, 0.95, or 0.99:1. On all 558 sows, BW, back fat thickness (BF), and litter weight were registered at d 108 of gestation and d 2 and 25 (weaning) post partum. On a subsample of 72 sows, additional measurements were made: sow BW and BF were measured on d 17 and litter weight was measured on d 10 and 17, and blood and urine samples were collected weekly. The litter size at weaning was not affected by the dietary Val:Lys (P = 0.23) and, on average, the sows weaned 13.0 ± 1.1 piglets. Average daily gain of the litter (2.93 ± 0.53 kg/d; P = 0.84), litter weight at weaning (P = 0.67), the average milk yield (11.3 ± 1.4 kg/d; P = 0.49), and milk contents of fat (P = 0.57), protein (P = 0.18), and lactose (P = 0.20) were not affected by the dietary Val:Lys. Increasing the dietary Val:Lys increased the milk concentration of Val (P < 0.05) and Ile(P < 0.01). The change in sow BW and BF were similar for all sows from d 2 to 17, d 17 to 25, and d 2 to 25 (P > 0.05). During lactation, sows, on average, had a BW and back fat loss of 22.1 ± 12.7 kg and 2.9 ± 1.7 mm, respectively. Plasma concentrations of glucose (P =0.26), lactate (P = 0.95), urea N (P = 0.84), NEFA (P= 0.24), and creatinine (P = 0.42); urine concentration of creatinine(P = 0.57); and concentrations of AA in whole blood (P >0.05) were not affected by the dietary Val:Lys. In conclusion, there was no effect of increasing the total dietary Val:Lys above 0.84:1 on sow metabolism and litter performance during lactation.

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