The NVIDIA Jetson instructions for a live application are here.
It looks like there’s some very recent papers and articles using this code for pose estimation.
Across-Species Pose Estimation in Poultry Based on Images Using Deep Learning
Study on Poultry Pose Estimation Based on Multi-Parts Detection:
“The automatic estimation of poultry posture can help to analyze the movement, behavior, and even health of poultry”
This paper mentions a few other uses of deep learning for chickens.