You could look at it directly as a presentation and discuss the different animals being shown in each of the photos.
You could print off and laminate the photos to make an interesting, eye-catching display about farm animals.
The students could also take the laminated photos and sort them into different types of farm animals. The students can then discuss why each type of animals is useful on a farm.
The photos could also be used as prompts for creative writing, factual writing or descriptive writing.