Alpine yearling doelings (22; 44+/-1.0kg) and mature does (25; 59+/-1.7kg) were used in an experiment with 16 weeks in late lactation, 8-13 weeks dry and 12 weeks in the subsequent lactation. Diets of 20, 35, 50 or 65% concentrate and 2.18, 2.34, 2.49 and 2.62Mcal/kg ME, respectively (20C, 35C, 50C and 65C treatments, respectively), were consumed ad libitum in late lactation, with a 35% concentrate diet (2.18Mcal/kg ME) in the first 4 weeks of the dry phase and 50% concentrate (2.65Mcal/kg ME) until kidding. Other goats consuming 20 or 35% concentrate in late lactation received 65 (2.65Mcal/kg ME) or 50% concentrate, respectively, in the dry phase (20A and 35A treatments, respectively). All goats consumed a 50% concentrate diet (2.42Mcal/kg ME) in the subsequent early lactation. DM intake in late lactation was similar among treatments (1.95, 2.21, 2.17, 2.10, 1.99 and 2.00kg per day for 20C, 35C, 50C, 65C, 20A and 35A, respectively; S.E.=0.098) and greater (P<0.05) for does versus doelings (2.16 versus 1.98kg per day; S.E.=0.058); DM intake in the dry phase was similar among treatments. Relative to BW, DM intake was greater (P<0.05) for doelings than for does in late lactation (4.16 versus 3.43% BW) and early lactation (4.56 versus 3.80% BW). The effect of dietary treatment on milk production in late lactation varied with parity (P<0.05); milk production by doelings was 1.39, 1.49, 1.43, 1.57, 1.29 and 1.52kg per day and by does was 1.01, 1.89, 2.38, 1.63, 1.17 and 1.34kg per day for 20C, 35C, 50C, 65C, 20A and 35A, respectively; S.E.=0.200). BW change during the entire 16 weeks late lactation phase was greater (P<0.05) for 65C than for other treatments except 50C (6.9, 5.6, 9.1, 10.4, 5.8 and 4.0kg for 20C, 35C, 50C, 65C, 20A and 35A, respectively; S.E.=1.28), although BW at kidding and litter weight were similar among treatments. BW, DM intake and milk production in the first 12 weeks of the subsequent lactation were not affected by dietary treatment or parity. In conclusion, with moderate to high quality forage in late lactation and a moderate level of concentrate in the dry period, the level of concentrate fed in late lactation and in the dry period may not affect subsequent lactation performance regardless of parity. Milk production by doelings in late lactation appears relatively less responsive to dietary concentrate level than that by does.

中文翻译：

---

泌乳后期不同日粮浓缩水平的奶山羊性能

高山一岁雏雏（22；44+/-1.0kg）和成熟雏雏（25；59+/-1.7kg）被用于试验，后期泌乳期为 16 周，干胎为 8-13 周，随后的泌乳期为 12 周. 20%、35%、50% 或 65% 浓缩物和 2.18、2.34、2.49 和 2.62Mcal/kg ME（分别为 20C、35C、50C 和 65C 处理）的日粮在泌乳后期随意食用，其中 35%在干燥阶段的前 4 周浓缩饮食（2.18Mcal/kg ME）和 50% 的浓缩物（2.65Mcal/kg ME）直到开玩笑。其他在泌乳后期消耗 20% 或 35% 浓缩物的山羊在干燥阶段分别接受 65 (2.65Mcal/kg ME) 或 50% 浓缩物（分别为 20A 和 35A 处理）。在随后的泌乳早期，所有山羊都消耗了 50% 的浓缩日粮（2.42Mcal/kg ME）。泌乳后期的 DM 摄入量在处理之间相似（1.95、2.21、20C、35C、50C、65C、20A和35A分别为每天2.17、2.10、1.99和2.00kg；SE=0.098) 和更大 (P<0.05) 与 dolings (2.16 vs 1.98kg per day; SE=0.058); 干期的 DM 摄入量在处理之间相似。相对于 BW，母猪的 DM 摄入量高于（P<0.05）泌乳后期（4.16 对 3.43% BW）和泌乳早期（4.56 对 3.80% BW）。泌乳后期日粮处理对产奶量的影响随胎次不同而不同（P<0.05）；母猪每天的产奶量为 1.39、1.49、1.43、1.57、1.29 和 1.52 公斤，而在 20C、5A、205C、20C、5C 和 35C 下，每天的产奶量为 1.01、1.89、2.38、1.63、1.17 和 1.34kg分别; SE=0.200）。65C 在整个 16 周泌乳后期的 BW 变化大于除 50C 以外的其他处理（P<0.05）（6.9、5.6、9. 20C、35C、50C、65C、20A和35A分别为1、10.4、5.8和4.0kg；SE=1.28)，尽管处理之间的开玩笑体重和窝重是相似的。后续泌乳期前 12 周的体重、干物质摄入量和产奶量不受日粮处理或胎次的影响。总而言之，在泌乳后期饲草质​​量中等至优质且干奶期精料水平适中的情况下，无论胎次如何，泌乳后期和干奶期的精料饲喂水平可能不会影响后续的泌乳性能。泌乳后期母猪的产奶量对日粮浓缩物水平的反应似乎比对母猪的反应要小。在随后泌乳的前 12 周内，DM 摄入量和产奶量不受饮食处理或胎次的影响。总而言之，在泌乳后期饲草质​​量中等至优质且干奶期精料水平适中的情况下，无论胎次如何，泌乳后期和干奶期的精料饲喂水平可能不会影响后续的泌乳性能。泌乳后期母猪的产奶量对日粮浓缩物水平的反应似乎比对母猪的反应要小。在随后泌乳的前 12 周内，DM 摄入量和产奶量不受饮食处理或胎次的影响。总而言之，在泌乳后期饲草质​​量中等至优质且干奶期精料水平适中的情况下，无论胎次如何，泌乳后期和干奶期的精料饲喂水平可能不会影响后续的泌乳性能。泌乳后期母猪的产奶量对日粮浓缩物水平的反应似乎比对母猪的反应要小。无论胎次如何，在泌乳后期和干奶期饲喂的精料水平可能不会影响随后的泌乳性能。泌乳后期母猪的产奶量对日粮浓缩物水平的反应似乎比对母猪的反应要小。无论胎次如何，在泌乳后期和干奶期饲喂的精料水平可能不会影响随后的泌乳性能。泌乳后期母猪的产奶量对日粮浓缩物水平的反应似乎比对母猪的反应要小。