On the problem of boar semen

I have a few boars whose semen has a short survival time. I picked it in the morning and died in the evening. Our factory uses the same diluted powder as other factories. Everyone else's is fine. Doubt is the problem of the boar itself, what kind of problem can lead to the short survival time of sperm?-- learned, thank you for sharing! The density of sperm is the key. Theoretically, the insemination volume of 5 billion / 60m-100mll can be preserved for about 24 hours. Time proved that 4 billion / is also very reasonable. But by 3 billion, the preservation time will be very short. The problem is put in the thermostat refrigerator. It used to be preserved for several days.-- first of all, put a thermometer in your thermostat to measure the temperature in the box and observe the changes in your box.