Southern by choice
Herd Master
Most of the U.S. is deficient and other soil and plant contents impact absorption as well (like sulfur, iron and molybdenum). I bet it is similar in Canada. That said, our vet isn't keen on the shots and we have only had one who had an issue (which he said was just her poor confirmation--he was in error and we treated her with gel and now she has fantastic shape that visitors even comment on). I know others will tell you the paste isn't worth its weight but it did help her.
Alot of the vets here give the Selenium shot automatically which drives me nuts... we (our county) isn't deficient yet the ones around us are. 2 of my vets are not big on the Selenium shots for goats and won't sell a bottle for anything! Cattle here always gets it though.
Glad to hear the paste works pretty good. A few years ago the kiko's had some soft legs down on their pasterns... we just did the kelp balls and in 3 days they were fine. Last year we did half dose of Selenium even though my vet was very hesitant... I think it was helpful. We have extremely high iron here and Dr. L at NC State thinks we may have a problem with the Molybdenum... it seems like we will be doing our yearly sampling of a percentage of goats for mineral analysis as long as we live here. UGH.
I think we have paste here too @Pearce Pastures ... glad you saw good results. I will check the exp date on mine in case we need it.