This study investigated the impact of energy supply and dietary lysine concentration on body reserve mobilization pattern, milk yield, nutrient balances and feed efficiency of sows fed 1 of 4 different dietary treatments. Two dietary components were formulated to meet the requirement for maintenance (basal; low in lysine) and milk production (lactation; high in lysine). A total of 24 second-parity lactating sows were assigned to the dietary treatments using a 2-component feeding strategy. Sows were supplied either high (HE) or low (LE) energy (i.e. two feeding levels), and within each feeding level, sows were supplied with high (_HL) or low (_LL) dietary lysine concentration from their total ration. The four dietary strategies, HE_HL, HE_LL, LE_HL, and LE_LL, were obtained by supplying different amounts and ratios of the basal and the lactation components. The dietary strategies were defined to generate distinct mobilization patterns in the four groups, i.e. mainly muscle mobilization (HE_LL), mainly fat mobilization (LE_HL), muscle + fat mobilization (LE_LL), or no mobilization (HE_HL). Sows and piglets were weighed on d 2, 7, 14, 21, and 28 of lactation and milk samples were collected weekly. Sows were enriched with deuterium oxide on d 3 and 28 of lactation to estimate body mobilization. Sows fed LE_HL and LE_LL strategies lost greater BW (P = 0.005), mobilized greater body protein (P = 0.001) and body fat (P = 0.01) than HE_HL or HE_LL fed sows. Sows fed HE_HL and LE_LL had greater milk yield (12.9 kg/d) than sows fed LE_HL (11.6 kg/d) with HE_LL fed sows being intermediate (12.7 kg/d; P = 0.04). Negative energy balances and mobilization of body fat and protein were observed for all 4 dietary strategies to various extent, indicating that sow mobilization pattern is rather complex. The study revealed that high BW loss and high body reserve mobilization are not necessary to achieve a high milk yield when dietary supply of nutrients were optimized according to the requirements. Feed efficiency, evaluated as net energy corrected for mobilization of body reserves, was greater in HE_HL and HE_LL strategies (P < 0.001) than in LE_HL or LE_LL strategy. In conclusion, nutrient balances and mobilization patterns were affected by the dietary strategies but all sows had greater fat mobilization than muscle mobilization. The HE_HL dietary strategy seemed to be superior to the other dietary strategies as these sows had both a high milk yield and a high feed efficiency.

这项研究调查了能量供应和日粮赖氨酸浓度对饲喂4种不同饮食方法之一的母猪的身体储备动员方式，产奶量，营养平衡和饲料效率的影响。制定了两种饮食成分以满足维持（基础；赖氨酸含量低）和产奶量（泌乳；赖氨酸含量高）的要求。共有24头第二胎泌乳母猪采用2组分喂养策略进行饮食处理。向母猪提供高（HE）或低（LE）能量（即两个饲喂水平），并且在每个饲喂水平内，从母猪的总日粮中向其提供高（_HL）或低（_LL）的日粮赖氨酸浓度。四种饮食策略，HE_{HL ，} HE _{LL ，} LE _HL和LE _LL是通过提供不同数量和比例的基础成分和泌乳成分而获得的。定义了饮食策略以在四组中产生不同的动员模式，即主要是动员（HE _LL），主要是动员脂肪（LE _HL），主要是肌肉+脂肪动员（LE _LL）或不动员（HE _HL）。在泌乳第2、7、14、21和28天称重母猪和仔猪，每周收集一次牛奶样品。母猪在哺乳的第3天和第28天富含氧化氘，以估计其动员能​​力。母猪喂LE _HL和LE _LL 与HE _HL或HE _LL喂养的母猪相比 ，策略损失的BW（P = 0.005），动员了更多的身体蛋白质（P  = 0.001）和体内脂肪（P = 0.01）。HE _HL和LE _LL喂养的母猪的产奶量（12.9 kg / d）比LE _HL喂养的母猪（11.6 kg / d）更高，HE _LL喂养的母猪为中等（12.7 kg / d；P = 0.04）。在所有4种饮食策略中均观察到负能量平衡和体内脂肪和蛋白质的动员，这表明母猪的动员模式相当复杂。研究表明，当根据需要优化营养的饮食供应时，高BW损失和高身体储备动员对于实现高产奶量不是必需的。HE _HL和HE _LL策略中的饲料效率（经净能量校正以调动身体储备）被评估为更高（P <0.001），高于LE _HL或LE _LL战略。总之，养分平衡和动员方式受饮食策略的影响，但所有母猪的脂肪动员都比肌肉动员更大。HE _HL的饮食策略似乎优于其他饮食策略，因为这些母猪既有很高的产奶量，又有很高的饲料利用率。