Topic 6 January 12, 2026 "Hormonal Control of Reproduction in Small Ruminants"

In this talk, Dr. Emilio Gutierrez (Ph.D.), Department of Biomedical Sciences at Colorado State University, provides an overview of the fundamental aspects of reproductive physiology in small ruminants, with an emphasis on the hormonal regulation of the reproductive cycle. The presentation covers the physiological basis of commonly used hormonal methods for estrus induction and synchronization in females, as well as a brief discussion of how some of these approaches can also enhance reproductive performance in males. Questions to answer and send to [email protected] if you want this topic to count toward the 2025-26 Winter Certificate. 1. Which hormone is released by the hypothalamus? A. FSH B. LH C. Progesterone D. GnRH 2. Which hormones are gonadotropins? A. Estradiol and progesterone B. FSH and LH C. Testosterone and melatonin D. Prostaglandins and cortisol 3. The male effect works mainly through: A. Visual cues B. Auditory signals C. Pheromonal/olfactory cues D. Physical contact 4. Progesterone-based protocols work by: A. Preventing ovulation B. Causing regression of CL C. Activating LH pulses D. B and C are correct 5. Prostaglandins are only effective when: A. The female is pregnant B. The CL is mature C. During anestrus D. During estrus 6. Melatonin stimulates reproductive activity by increasing: A. Estradiol B. Progesterone C. GnRH and LH D. Prostaglandins