I was working cows Wednesday giving vaccinations and deworming them and putting on/ replacing tags, and I also recorded if they were lactating, and if they were, what was coming out of the teat. My question is how long before parturition is colostrum produced? What other mammary secretions do the cows produce? Not everybody in this herd calves at the same time. Some are late winter early spring, others should be fall calvers, although I did notice a few new calves about a month ago (late). What I wrote down is L for obviously lactating milk, but some had more of a clear stickier liquid (I do know the difference beween a cow and a bull, and no I was not pulling on any bulls, lol.), some had yellow/orange serum--colostrum. So for some with the colosturm I had to squeeze til the end of the teat broke and it came out. So it looks like I am going to get some late spring summer calves? That's crappy. Some of the stuff was watery, are these just poor milkers or should I go ahead and call them dry? I haven't worked the calves yet, so working them will probably give me a little more clue as to what is going on as far as number of calves and number of cows with watery milk/stuff.