ا. د/ فايق حسنى حسين فراجا.د / ناظم عبد الرحمن شلبىأ.د.م/ عمرو أحمد جبر2026-05-112026-05-11https://dspace.academy.edu.ly/handle/123456789/2037Lifetime lamb production is a crucial measure of ewe efficiency and overall flock profitability. Understanding the factors influencing these complex traits are essential for effective breeding and management strategies. Tracking total lambs weaned annually and over an ewe's lifetime directly enhances farm profitability and productivity (Young and Thompson, 2020; Farrell et al., 2021) and aligns with the benefits of extending ewe productive life, contributing to greater efficiency by reducing frequent flock replacements (Pinto et al., 2025).The Rahmani breed is vital for Egyptian sheep production, especially in the Nile Delta. Rahmani adaptability to local environmental conditions and role in smallholder farming are significant. Therefore, improving animals’ productivity is crucial for maximizing farm efficiency and profitability and is key for farmer livelihoods and meeting product demand. This is particularly evident in semi-intensive sheep farming systems in areas facing seasonal reproductive challengesEnvironmental and Genetic Influences