Moehn S, Susenbeth A
Institute of Animal Nutrition, University Hohenheim, Stuttgart, Germany.
Arch Tierernahr. 1995;47(4):361-72. doi: 10.1080/17450399509381819.
The objective of this trial was to quantify the influence of a varied dietary crude protein content supplying equal amounts of limiting essential amino acids on parameters of energy metabolism. A total of 16 castrated male pigs were allocated to four dietary treatments and subjected to measurements of N-balance and gas exchange at approximately 65 and 85 kg live weight. Two ratios formulated to be isoenergetic differed in crude protein content (CP) and were offered at two feeding levels. At 85 kg, rations with a lower CP content were used. Multiple regression analysis was used to determine the effects of CP and those of live weight and metabolizable energy intake (IME). A rise in CP significantly increased energy losses via urine and the energy retained as protein (RPE), while the energy retained as fat was significantly reduced. Energy retention tended (P < 0.1) to decrease, while related to IME the reduction was non significant. The proportion of RPE in energy gain was significantly improved. Possible mechanisms for this shift towards reduced fat and energy retention at higher protein intakes are discussed. It is concluded that in practical feeding, rations with a lower CP content should be fed restrictively or be reduced in energy content to avoid excessive carcass fatness.
本试验的目的是量化提供等量限制性必需氨基酸的不同日粮粗蛋白含量对能量代谢参数的影响。总共16头去势公猪被分配到四种日粮处理组，并在大约65千克和85千克体重时进行氮平衡和气体交换测量。两种等能量配方在粗蛋白含量（CP）上有所不同，并以两种饲喂水平提供。在85千克时，使用了粗蛋白含量较低的日粮。采用多元回归分析来确定粗蛋白、体重和代谢能摄入量（IME）的影响。粗蛋白含量的增加显著增加了通过尿液的能量损失以及作为蛋白质保留的能量（RPE），而作为脂肪保留的能量则显著减少。能量保留有下降趋势（P<0.1），而与代谢能摄入量相关时，这种减少不显著。RPE在能量增加中的比例得到显著改善。讨论了在较高蛋白质摄入量下脂肪和能量保留减少这种转变的可能机制。得出的结论是，在实际饲养中，应限制饲喂粗蛋白含量较低的日粮，或降低其能量含量，以避免胴体脂肪过多。
