Aim of study: To evaluate tubal patency in repeat breeder Holstein cows with the purpose of estimating the frequency of oviduct obstruction as a cause of the repeat breeding syndrome. Area of study: Lugo (NW Spain) Material and methods: In 50 repeat breeding cows. a solution of the dye phenol-sulphon-phthalein (PSP) was instilled into one uterine horn with the aid of a balloon cathete... https://www.crochetandknitshop.com/product-category/glucosamine-chondroitin-msm/