Dairy industry plays a critical role in the economics of many countries. Recently, dairy companies have faced challenges in Iran due to their present position and new governmental policies. In this paper, a dairy company which has the significant market share in Iran is chosen. Despite having a variety of products which are manufactured in this company, yoghurt is selected due to its attractiveness in Iranian food habits. Therefore, this company is looking for a production planning which helps it gain a considerable profit and boost its current market share. For this reason, a linear programming model is formulated and the obtained results show that profit achieved by this model is higher than those obtained in the last years.