[PipKelpy]

At 147 days, 1st sheep is due 29th March, last sheep 27th April.

I have 1 bottle, when do I jab?

I ask as I have had ewes, in the past start lambing from 142 days and drag on until 153!

[Twotwo]

I usually do them 4 weeks before the first ewe is due (147 days) with the hope the last ones have had their immune systems boosted, just a bit early ! you often get one who lambs a few days before their date .. just do the best you can .. you’re lucky to have some

[twizzel]

4 weeks before the first ewe is due should be fine.

[Bywaters]

FWIW, Melvyn Carr (south yorkshire) has received some Heptovac this week. I suspect it was all pre-ordered though, but my point is that supplies may be coming on stream again

[shep53]

Life is never perfect and you are just boosting the immunity that should already be there ,  4-6 wks before lambing is the recommended period but we all know lambing doesn't work out like that , so some time this week ,  would be 3 weeks before start and 7 weeks to end roughly give or take  .