Sorry, this will produce a kink in the animation when looped because it contains 2 identical frames.To achieve a perfect looping animation you either need to do some maths or add a frame. So for this example make the animation 76 frames enter 360 as Y rotation at frame 76 then render frames 1 to 75. The maths, divide 360 by the number of frames, then subtract the result from 360 and enter that at the last keyframe

(360 divided by 75 equals 4.8, 360 minus 4.8 equals 355.2)

Also, it is not necessary to create a keyframe at frame 1, it is there by default. Nothing can exist in a Poser scene without it creating a keyframe at frame 1