Like Racoon and Kangaroo, here comes the Cow detector using Faster RCNN.
Download model from zoo - Link
And also included my inference graph for testing purpose - Link
[1] https://github.com/EdjeElectronics/TensorFlow-Object-Detection-API-Tutorial-Train-Multiple-Objects-Windows-10#8-use-your-newly-trained-object-detection-classifier
[2] https://tensorflow-object-detection-api-tutorial.readthedocs.io/en/latest/training.html