Ullrich Cristina, Langeheine Marion, Brehm Ralph, Taube Venja, Rosillo Galera Mercedes, Rohn Karl, Popp Johanna, Visscher Christian
Institute for Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, D-30173 Hanover, Germany.
Institute for Anatomy, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, D-30173 Hanover, Germany.
Animals (Basel). 2019 Nov 19;9(11):984. doi: 10.3390/ani9110984.
Sustainably produced poultry meat with consideration of animal health poses a challenge for broiler production. Low protein diets with high amounts of synthetic amino acids (AAs) like methionine (Met) are the consequence. In a five-week feeding trial, 360 broilers (Ross 308) assigned to four feeding groups were offered protein-reduced complete diets (starter: 20% crude protein (CP); grower: 18.5% CP; finisher: 17.5% CP), supplemented with essential AAs. The "MHA" group received DL-2-hydroxy-4-(methylthio) butanoic acid (DL-HMTBA; trade name: MHA), groups "L" and "DL" the respective Met source in equivalent concentrations each exceeding the nutritional recommendations. "R-MHA" ("R" for "reduced") received the minimum required level (using MHA as Met source). Performance exceeded performance goals without differences between the groups. The average feed conversion ratio (FCR) amounted to 1.35. The carcass/body weight ratio of R-MHA was significantly lower (0.782) compared to DL (0.808) and L (0.809). Breast meat of R-MHA contained significantly more fat (144 g/kg dry matter (DM)) compared to L (104 g/kg DM) and significantly lower CP content (R-MHA: 838 g/kg DM; L: 875 g/kg DM). The results indicated possible improvement in slaughter yield by protein-reduced diets supplemented with L-Met, thus recommending further research focusing on the Met influence.
在考虑动物健康的情况下可持续生产禽肉对肉鸡生产构成了挑战。因此出现了含有大量合成氨基酸（如蛋氨酸（Met））的低蛋白日粮。在一项为期五周的饲养试验中，将360只肉鸡（罗斯308）分配到四个饲养组，为其提供蛋白质含量降低的全价日粮（开食料：20%粗蛋白（CP）；生长料：18.5%CP；育肥料：17.5%CP），并补充必需氨基酸。“MHA”组接受DL-2-羟基-4-（甲硫基）丁酸（DL-HMTBA；商品名：MHA），“L”组和“DL”组分别接受等效浓度的各自蛋氨酸来源，每种均超过营养推荐量。“R-MHA”（“R”代表“降低”）接受最低所需水平（使用MHA作为蛋氨酸来源）。生产性能超过了生产性能目标，且各组之间无差异。平均饲料转化率（FCR）为1.35。与“DL”组（0.808）和“L”组（0.809）相比，“R-MHA”组的胴体/体重比显著更低（0.782）。与“L”组（104 g/kg干物质（DM））相比，“R-MHA”组的胸肉脂肪含量显著更高（144 g/kg DM），且粗蛋白含量显著更低（“R-MHA”组：838 g/kg DM；“L”组：875 g/kg DM）。结果表明，补充L-蛋氨酸的低蛋白日粮可能提高屠宰率，因此建议进一步开展侧重于蛋氨酸影响的研究。
