3 Repro_Lab

3 Repro_Lab - ANS 150 - Introduction to Animal Science...

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ANS 150 - Introduction to Animal Science The purpose of this laboratory is to: (a) allow students to learn to identify the various reproductive organs; (b) teach students how to determine the reproductive status of an animal based on ovarian morphology; (c) introduce students to anatomical changes that occur during pregnancy; and (d) introduce students to the concept of estrous cycles and the hormones involved with their control. A thorough understanding of the reproductive process is a critical component of animal science. This is due to the fact that, regardless of the species of animal involved, most management programs or schedules are based upon the female reproductive cycle. For example, when a female exhibits estrus or sexual receptivity this usually determines when males need to be prepared for breeding. Similarly, when a female is bred, then this determines the schedule of care that needs to be administered during gestation and when, in turn, preparations for birth need to be initiated. Consequently, a working knowledge of reproductive anatomy and endocrinology is an important prerequisite for understanding reproduction and animal management. The things that students should be able to do after participating in today's laboratory, studying lecture and laboratory notes, and viewing the computer files are as follows: 1) Identify the female reproductive organs including ovarian structures; 2) Identify male reproductive organs; 3) Identify the species of animal from which reproductive tracts were taken; 4) Determine whether females are mature or immature; 5) Determine the phase of the reproductive cycle for mature females; 6) Identify different placental membranes; and 7) Know the basic functions of male and female reproductive organs. Identification of Reproductive Anatomy Figures 1 and 2 are called “flow diagrams”. These diagrams outline the spatial orientation of the organs of both the male and female reproductive tracts. When learning the different organs of the male and female reproductive tracts it is important to find a reference point first. This is important since the anatomical relationship between the various organs doesn’t change across different species of mammals. For example, the ovary is always surrounded by the anterior portion of the oviduct and the oviduct always is between the ovary and the uterus. For the female reproductive tract, the ovaries or the vagina are good reference points to use because they represent the most interior portion (ovary) and the most exterior portion (vagina) of the female reproductive tract. For the male, the testicles, bladder and penis are good reference points.
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Figure 1. Schematic Diagram of Orientation of Female Reproductive Anatomy Ovary Ovary Oviduct Oviduct Uterine horn Uterine horn Uterine body Cervix Vagina Vulva Broad ligament Broad ligament
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Testis Testis Vas deferens
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3 Repro_Lab - ANS 150 - Introduction to Animal Science...

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