Global Automatic Milking Systems Market By Type (Single-Stall Unit , Multi-Stall Unit , and Automated Milking Rotary), By Application (Herd Size Below 100 , Herd Size Between 100 and 1,000 , and Herd Size above 1,000), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029