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【Objective】 Aiming at the problems of easy falling off and easy to cause pig infection in traditional pig breeding ear tag recognition, the paper used the improved YOLOv5s model to carry out non-invasive recognition of pig face.【Method】 Firstly, the distance of K-Means was changed to 1-IOU, which improved the adaptability of the target anchor frame of the model; Secondly, the CA coordinate attention mechanism was introduced to improve the model feature extraction; Finally, BiFPN feature fusion was introduced to effectively use the features to improve the detection ability of the model. The pig face dataset used in the experiment was divided into 5 categories, with 12 756 samples after data enhancement, and the training set and test set were divided into a ratio of 9∶1.【Result】 The improved algorithm reached 0.926, 0.897 and 0.955 in accuracy, recall, and average accuracy (IOU=0.5), which were 13.2%, 3.0% and 2.2%, while the improved algorithm has better generalization ability and high recognition accuracy in single, multiple, small target, dense, and occluded scenes. 【Conclusion】 Using deep learning algorithm can get the facial information of pigs and identify them accurately, reduce the situation of missed inspection and wrong inspection, and provide better technical support for intelligent management of pigs. [ABSTRACT FROM AUTHOR]

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The cell is the basic structural, functional, and biological unit of all known living organisms. Cell death plays a pivotal role for the development of multicellular organism and in maintenance of the steady state in continuously renewing tissues. There are two kinds of cell death, one is non-programmed cell death （NPCD）, and the other is programmed cell death （PCD）. Programmed cell death, according to the mechanism, can be divided into apoptosis, autophagic cell death, paraptosis, mitotic catastrophe, oncosis, pyroptosis, autoschizis, necroptosis, entosis, ferroptosis, et al. In recent years, lots of attention has focused on the role of programmed cell death in tumorigenesis, And this article will make a brief review on the mechanisms of various types of programmed cell death. [ABSTRACT FROM AUTHOR]