I have 3 cows I want to breed to calf together. I have a young bull I want to breed them. If I synchronize the 3 cows could a 15 month old bull breed all 3 of them while they are in heat ? If synchronize is not the best what would your solution be?
There is really no way to getm to all calve at the same time. You can get better odds that they will be close together but that's about it. I AIed 5 cows one day and the difference between the youngest and oldest calf was 2 weeks.
Lutalyse only works if the animal has a CL (Corpis Leuteum sp?). So, if the animal cycled just prior to you turning your bull out, by day 5 she should have a CL for the Lute shot to work. 2-5 days later they all should be in heat - IF they have been cycling. During the first 5 days, he will be breeding anything that comes in during those 5 days. If the bull had not been with them, getting them bred, the shot given on day 5 would NOT work on them because it was too close to their natural heat.
Oh, and it was not mentioned, you MUST put a heat tag of some sort on the heifers. Anything he breeds you do NOT want to give a shot to.