Under the deal, Vallée's portfolio of more than 100 products including parasiticides, anti-infectives and vaccines for livestock, horses, and companion animals, will be combined with Merck's animal-health division. Merck said the acquisition will strengthen its presence in Latin America, which is responsible for 11 percent of the world food production. Merck employs 9,200 in West Point and Upper Gynedd in Montgomery County.