Four hundred goats descended on the verdant hillsides of Golden Gate Baptist Seminary in July, cutting the grass as well as the seminary’s costs for landscaping staff. “We save approximately $5,000 in labor and materials by contracting with Goats-R-Us,” said Robert Dvorak, the seminary’s facilities management director. The goats, which were stationed for three weeks on the steeper areas of the 120-acre campus in Mill Valley, Calif., have been annual visitors for the past five years. They were managed by a Chilean goat herder and two border collies. The goats were supplied with water, a salt lick and all the delectable natural grasses and poison oak they could eat.