In the past 43 years Maritimer George Gould has shod close to 65,000 oxen in his "smithy" shop at Yarmouth, Nova Scotia. In the days of the early settlers oxen performed yeoman service on the province's lush farmlands, have gradually dwindled in numbers with the advances in mechanization which have revolutionized the farming industry. Today, genial smithy Gould, who uses a sturdy canvas sling for shoeing the 1 1/4 ton oxen, is down to his last dozen customers.