Hofmann Philipp, Siegert Wolfgang, Ahmadi Hamed, Krieg Jochen, Novotny Moritz, Naranjo Victor D, Rodehutscord Markus
Institute of Animal Science, University of Hohenheim, 70599 Stuttgart, Germany.
Bioscience and Agriculture Modeling Research Unit, Department of Poultry Science, Tarbiat Modares University, Tehran 14115-336, Iran.
Animals (Basel). 2020 Aug 11;10(8):1392. doi: 10.3390/ani10081392.
Responses of broiler chickens to dietary glycine equivalent (Gly) are affected by dietary cysteine and choline. Hence, this study investigated interactive effects among dietary Gly, cysteine, and choline on the growth of broiler chickens. Male Ross 308 broiler chickens were maintained in 105 metabolism units (10 birds/unit) from days 7 to 22. Excreta were collected in 12-h intervals from days 18 to 21. Blood was sampled on day 22 (1 bird/unit). Five levels each of Gly (9-21 g/kg), cysteine (2-5 g/kg), and choline (0.5-1.7 g/kg) were tested under 15 diets in 7 replicates each following a fractional central composite design. Another diet was provided to five metabolism units (15 birds/unit) to measure prececal amino acid digestibility. Data were evaluated using neural networks. The gain:feed ratio (G:F) increased with digestible Gly intake. Differences between low and high digestible cysteine intake were low. Effects of choline intake on G:F were low. Nitrogen-utilization efficiency (NUE) was high (≥77%), with low variation among treatments. Plasma metabolites varied among treatments and indicated that metabolism of Gly, cysteine, and choline was influenced. These findings showed that interactive effects of dietary Gly, cysteine, and choline on growth were small, possibly because NUE was barely influenced.
肉鸡对日粮甘氨酸当量（Gly）的反应受日粮中半胱氨酸和胆碱的影响。因此，本研究调查了日粮中甘氨酸、半胱氨酸和胆碱之间对肉鸡生长的交互作用。7至22日龄的雄性罗斯308肉鸡饲养于105个代谢单元中（每个单元10只鸡）。在18至21日龄期间，每隔12小时收集一次排泄物。在22日龄时采集血液样本（每个单元1只鸡）。按照分式中心复合设计，在15种日粮下对甘氨酸（9 - 21 g/kg）、半胱氨酸（2 - 5 g/kg）和胆碱（0.5 - 1.7 g/kg）各五个水平进行测试，每个处理重复7次。向五个代谢单元（每个单元15只鸡）提供另一种日粮，以测定盲肠前氨基酸消化率。使用神经网络对数据进行评估。增重：饲料比（G:F）随着可消化甘氨酸摄入量的增加而提高。低可消化半胱氨酸摄入量和高可消化半胱氨酸摄入量之间的差异较小。胆碱摄入量对G:F的影响较小。氮利用效率（NUE）较高（≥77%），各处理间差异较小。血浆代谢物在各处理间存在差异，表明甘氨酸、半胱氨酸和胆碱的代谢受到影响。这些结果表明，日粮中甘氨酸、半胱氨酸和胆碱对生长的交互作用较小，可能是因为氮利用效率几乎未受影响。
