how do I correctly say that “during my industrial training at the livestock unit, A sow farrowed 7 piglets. A vaccine was administered to the piglets days after birth (please what is the name of the supplement that is usually given to piglets days after

You can phrase your statement like this: "During my industrial training at the livestock unit, a sow farrowed seven piglets. A vaccine was administered to the piglets a few days after birth, along with an iron supplement called iron dextran, which is commonly given to piglets shortly after birth to prevent anemia." Iron dextran is one of the most commonly used iron supplements for piglets a few days after they are born. You could also simply refer to it as "iron supplementation" if you're looking for a broader term.