Figueroa Jaime, Cordero Paloma, Herrera-Alcaíno Sofía, Guzmán-Pino Sergio A
Instituto de Ciencias Agroalimentarias, Animales y Ambientales-ICA3, Universidad de O'Higgins, San Fernando 3070000, Chile.
Programa de Doctorado en Ciencias Silvoagropecuarias y Veterinarias, Campus Sur, Universidad de Chile, Santiago 8820808, Chile.
Animals (Basel). 2025 May 28;15(11):1574. doi: 10.3390/ani15111574.
Umami taste compounds are perceived in broilers through taste buds that detect peptides and amino acids, which can positively or negatively affect their feeding behavior. In this study, we evaluated the intake behavior for four essential amino acids (Lysine, Methionine, Threonine, and Tryptophan) in chickens. Sixty-four one-day-old male birds (Ross 308) were used. For 16 days during the early stage of the birds, two-choice preference tests were performed, in which 16 combinations composed of four amino acids in four concentrations (0.1 to 1.5%) diluted in water were evaluated, which were supplied in contrast to the delivery of water (a neutral compound) to a pair of birds in a pen for 4 h of administration after a prior 1 h fast. Amino acid solutions such as Threonine and Tryptophan tended to show less preference at the highest exposed concentrations (1.5%) concerning drinking water, which was confirmed in the case of Threonine when performing a sensory-motivated intake analysis (SMI). The opposite occurred with Lysine (1.5%), which numerically showed a higher preference ratified by SMI and acceptability analysis concerning water and other concentrations of the same amino acid, respectively. When palatability was measured with pecking cluster size, no significant differences across amino acid concentrations were observed, which is probably attributed to short recording periods and differences in solution intake behavior between chickens and previous experimental models such as rats. The results reinforce the notion that it is necessary to standardize feeding behavior tests in birds according to their feeding patterns and nutritional needs.
鲜味化合物通过检测肽和氨基酸的味蕾在肉鸡中被感知，这会对它们的采食行为产生正向或负向影响。在本研究中，我们评估了鸡对四种必需氨基酸（赖氨酸、蛋氨酸、苏氨酸和色氨酸）的采食行为。使用了64只1日龄雄性鸡（罗斯308）。在鸡的早期阶段的16天里，进行了双选偏好测试，评估了由四种浓度（0.1%至1.5%）的四种氨基酸在水中稀释组成的16种组合，在禁食1小时后，将其与水（一种中性化合物）分别提供给围栏中的一对鸡，给药4小时。苏氨酸和色氨酸等氨基酸溶液在最高暴露浓度（1.5%）时对饮用水的偏好往往较低，在进行感官驱动采食分析（SMI）时，苏氨酸的情况得到了证实。赖氨酸（1.5%）则相反，在SMI中数字上显示出更高的偏好，并且分别在水和相同氨基酸的其他浓度方面通过可接受性分析得到了认可。当用啄食集群大小测量适口性时，未观察到氨基酸浓度之间的显著差异，这可能归因于记录期短以及鸡与先前实验模型（如大鼠）之间溶液采食行为的差异。结果强化了这样一种观念，即有必要根据鸟类的采食模式和营养需求对其采食行为测试进行标准化。
