In this year's Indo-ducks, all non-fertilized eggs. In herd 2 drakes: one for 3 years; the second is 1 year old. The past 2 seasons (spring-summer) was a wonderful conclusion (almost 95%). What is the reason? And what needs to be done? Thank! (Natalia)
Your question is rather unusual. I will say right away that of all types of ducks in the “love” plan, musky are the most whimsical. For example, there are often cases when drakes prefer only certain females. In a large herd, it often happens that the male "tramples" only two or three weifers. The rest remain unfertilized.
It happens that the females themselves do not accept the courtship of a male, thereby also laying unfertilized eggs. As for your problem, when everything was fine until a certain time, it is difficult to say something. The fact is that there are "defective" drakes. That is, their body is so small that it cannot perform its function. Often such a "marriage" can be both innate and acquired.
Perhaps this is the case that you have. The only interesting thing is that two indiotki immediately suffer from such a defect. Unfortunately, I think their function will not be restored, so you need to change the drakes. True, the question arises, what could provoke this problem? Maybe the bird is overworked?
Watch the flock for some time. If nothing changes, I advise you to purchase new “husbands-musks” sooner. I think egg fertilization will return.