The document discusses the evolution of batch farrowing in swine production from the 1960s to the 2010s, highlighting the transition from weekly to monthly batch systems. It outlines the benefits of 4-week and 5-week batch cycles for breeding, farrowing, and weaning, emphasizing improvements in health and productivity through better management and biosecurity measures. Additionally, it addresses infrastructure demands and the importance of proper scheduling for efficient gilt and sow space utilization.