42 42 EARLY DEVELOPMENT Organ Development During the first few weeks, the primary focus is on the development of vital organs and the immune system. The reproductive organs begin to form, but they are not yet functional. Testicular Development and Fertility Potential Between weeks 1 and 8, Sertoli cells – vital for future sperm production – rapidly multiply, with the most critical fertility window occurring from weeks 6 to 8, after which their proliferation stops. The final Sertoli cell count determines adult sperm output. GROWTH PHASE Body weight Monitoring Regular monitoring of body weight and uniformity is essential to ensure proper development. Underweight males may experience delayed development of their reproductive organs. STAGE 1: 0–10 WEEKS STAGE 2: 10–20 WEEKS 0 10 Weeks of age ONSET DEVELOPMENT Organ Development Testicular enlargement commences gradually. Although spermatogenesis has not yet started, the physiological foundation for hormonal activation is being established. Nutrition and Feeding Adequate nutrition and consistent conditions between 2–12 weeks are important for Sertoli cell development. Overfeeding or exposure to stress during this period may result in long-term reductions in fertility. 18 KEY STAGES OF SEXUAL ORGAN DEVELOPMENT IN MALES LOHMANN › MANAGEMENT GUIDE › EARLY MANAGEMENT
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