I vaccinated our tame lambs today with heptavac, first dose. They all seem a little under the weather tonight, have eaten their creep and grazed all afternoon but look a bit lethargic. I've left them out tonight as they are coughing a bit and thought fresh air is better than sitting in a shed. Has anyone else noticed this? They are 7 and 9 weeks old and otherwise healthy. The 5 week old lambs I did at the same time are looking fine down the shed. Will they be ok? Will keep an eye on them tomorrow closely just wondered if this is normal.