An ethogram of piglet vocalizations during suckling

Per Jensen, Bo Algers
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引用次数: 40

Abstract

There is obvious confusion in the literature on pig vocalizations. It is not clear whether pig calls are discrete or continuous in form and function, and whether they are specific signals. The aim with this study was to try to classify piglet vocalizations uttered during nursing, and the hypothesis was that the sounds are, in fact, structurally discrete. All vocalizations uttered during 33 nursings in 3 litters during 3 days after farrowing were recorded, and 106 sounds were processed in a spectrograph. The spectrograms were analysed by the following method. Firstly, they were classified in groups on the basis of a number of physical parameters which were quantified for each spectrogram. Secondly, the inter-class dissimilarity was tested with single-link cluster-analysis. Thirdly, the correlation of the physical parameters was tested within classes with correlation and regression calculations. The analysis supported the existence of 5 discrete classes of piglet vocalizations: croaking; deep grunt; high grunt; scream; and squeak. In croaking, scream and squeak there was a correlation between basic frequency and time, indicating a continuous variation of intensity within the discrete call classes. It was further concluded that any viewpoint on the function of the sounds must be based on studies of statistical links between specific signals and certain behaviour in the receiver.

仔猪在哺乳时的发声谱图
在关于猪发声的文献中有明显的混淆。目前尚不清楚猪的叫声在形式和功能上是离散的还是连续的,以及它们是否是特定的信号。这项研究的目的是试图对哺乳期间仔猪发出的声音进行分类,假设这些声音实际上在结构上是离散的。记录3窝分娩后3天内33次护理过程中发出的所有声音,并用声谱仪对106种声音进行处理。用以下方法对谱图进行分析。首先,根据一些物理参数对它们进行分组,这些物理参数对每个谱图进行量化。其次,采用单链接聚类分析方法对类间差异进行检验。第三,通过相关和回归计算,在类内检验物理参数的相关性。该分析支持了5种不同类型的仔猪叫声的存在:呱呱叫声;深繁重;高繁重;尖叫;和吱吱声。在呱呱、尖叫和吱吱声中,基本频率和时间之间存在相关性,表明在离散的叫声类别中强度存在连续变化。进一步的结论是,关于声音功能的任何观点都必须以研究特定信号与接收器的某些行为之间的统计联系为基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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