As Delvis has already mentioned, have you stalled?
If not carry on with Madcow (I really, really enjoyed madcow and seen me some great gains), if you have stalled then it depends where you want to go?
Want to carry on making strength gains, or?
I would do something different to strength for a week or two and then either back on madcow or 5/3/1.
Ive stalled on squats for about 5 weeks now.
Bench hasn't gone up since I started madcow?
OHP actually went up by 2kg last week.
deadlift ive stalled on that for about the same time as squats.
bent over rows I have stalled for about 3 weeks.
Yes I would love to carr yon making strenghth gains.
5/3/1 looks good, but maybe your right and do something else for a couple weeks.
Do you think maybe doing madcow routine but at a really low weight for about two three weeks would be enough change. I don't want to stop squatting.
Maybe start jan 1st the 5/3/1 program, good start to the year.