Livestock production (milk, meat) depends heavily on reproductive activity, leading to scientific research and practice to find ways to optimize growth and livestock operation in order to achieve maximum economic efficiency. Research work in cattle reproduction, especially in family farms, are particularly important because understanding leads to increase capacity while the number of existing animals, meat and milk production, combating infertility, increased birth rates, increasing revenue and improving people's work throughout the year. In the area of reproduction, these goals are of particular importance, both theoretical and practical, especially after the introduction and expansion of artificial insemination technique, a method that has transformed animal reproduction activity in a process managed and controlled entirely by man. It should be noted that the farm is the main basis of agricultural production, so it is necessary to highlight issues affecting the animal reproduction in the investigated area. Being holdings, taking into account recommendations made by the World Health Organization (WHO) and United Nations Food and Agriculture Organization (FAO) as well as those of romanian and foreign specialists in human nutrition. In this regard, we calculated the main nonlinear regression of correlations analysis that exist between the LU and the most important factors that affecting increased production of milk cows in the South East and North East economic region of Romania.