Hi, I understand you would vaccinate ewes and replacement lambs with Heptavac p plus as it covers more and provides passive immunity to lambs but why would you Ovivac store lambs instead of using Heptavac?
Correct. Heptavac P+ covers everything that Ovivac P+ does, along with lamb dysentery. That will only effect new born lambs, and not even those in the Cotswolds (& other areas?), so no advantage whatsoever in doing slaughter lambs with the more expensive vaccine. Cost about 10p/dose extra last time I worked it out. Over a lot of lambs, it might be worth consideration, over a small number, almost irrelevant I suppose.I think there is something slightly different between the two, ovivac-p has something extra for lambs I think. I use ovivac on the lambs and hept on the ewes but basically its better to use either than nothing. ovivac might be a touch cheaper too.
The lamb dysentery cover might not be full, otherwise, it wouldn't create a problem. I believe lamb dysentery is a massive killer if you get hit, but thankfully rare these days because most sheep are covered by Heptavac or Covexin.I've often wondered if I could dose all the lambs with Ovivac, then if I decided to keep any for replacements switching them onto Heptavac when I did the pre-lambing boosters? I've not met anyone that does tho, so I tend to use Heptavac on the lambs..