The dairy term used to describe the turnover or loss of customers is known as "churn." It is usually expressed as a percentage of the total number of customers who leave during a particular period. High churn rates indicate that a dairy company is losing customers at a rapid pace and may need to address issues related to product quality, customer service, or marketing strategies to retain its customer base and attract new ones. On the other hand, low churn rates indicate that a dairy company is successfully meeting its customer's needs and expectations, leading to customer loyalty and long-term profitability.