{"id":20375,"date":"2026-10-05T14:29:27","date_gmt":"2026-10-05T07:29:27","guid":{"rendered":"https:\/\/www.vietstock.org\/?p=20375"},"modified":"2026-10-05T14:29:27","modified_gmt":"2026-10-05T07:29:27","slug":"veterinary-ultrasound","status":"publish","type":"post","link":"https:\/\/www.vietstock.org\/en\/industry-news\/veterinary-ultrasound\/","title":{"rendered":"Veterinary Ultrasound: Applications in Reproductive Diagnosis and Herd Management"},"content":{"rendered":"

Veterinary ultrasound is a diagnostic imaging technology that uses high-frequency sound waves to visualise soft-tissue structures inside an animal\u2019s body without the use of ionising radiation.<\/span><\/p>\n

In livestock production, one of the most important applications of ultrasound is <\/span>reproductive management<\/b>, including pregnancy confirmation, evaluation of the uterus and ovaries, monitoring foetal development, and supporting breeding or herd-management decisions.<\/span><\/p>\n

When ultrasound findings are combined with breeding dates, reproductive records, productivity data, and individual animal history, ultrasound becomes more than a diagnostic tool. It can also support practical decision-making at farm level.<\/span><\/p>\n

Key takeaways<\/b><\/h2>\n
    \n
  • Veterinary ultrasound uses high-frequency sound waves to create real-time images of soft tissues.<\/span><\/li>\n
  • B-mode is commonly used for reproductive diagnosis, while Doppler provides additional information on blood flow and perfusion.<\/span><\/li>\n
  • In cattle, approximately <\/span>28\u201332 days after breeding<\/b> is a commonly used early window for practical pregnancy confirmation in herd management.<\/span><\/li>\n
  • In sows, pregnancy may be detected from around day 20, but results are generally more reliable from approximately <\/span>day 23\u201324 onward<\/b>.<\/span><\/li>\n
  • In sheep and goats, ultrasound may also help determine litter size, although accuracy depends strongly on the timing of examination.<\/span><\/li>\n
  • Accuracy depends on equipment quality, transducer type, timing of the examination, and operator experience.<\/span><\/li>\n
  • The greatest value of ultrasound on farms comes from converting diagnostic findings into data that support breeding, group management, and reproductive decision-making.<\/span><\/li>\n<\/ul>\n

    1. What is veterinary ultrasound and how does it work?<\/b><\/h2>\n
    \"Veterinarian
    Veterinary ultrasound uses high-frequency sound waves to create real-time images of soft tissues and support reproductive diagnosis in animals.<\/figcaption><\/figure>\n

    1.1. Basic components<\/b><\/h3>\n

    A veterinary ultrasound system generally consists of three main components.<\/span><\/p>\n

    Ultrasound unit<\/b><\/p>\n

    The main unit is responsible for:<\/span><\/p>\n

      \n
    • Processing signals received from the transducer.<\/span><\/li>\n
    • Generating and displaying images.<\/span><\/li>\n
    • Adjusting imaging parameters.<\/span><\/li>\n
    • Saving images or video where supported.<\/span><\/li>\n
    • Managing examination information on some models.<\/span><\/li>\n<\/ul>\n

      Transducer<\/b><\/p>\n

      The transducer both emits and receives ultrasound waves.<\/span><\/p>\n

      Depending on the animal species and intended application, common types may include:<\/span><\/p>\n

        \n
      • Linear transducers.<\/span><\/li>\n
      • Convex transducers.<\/span><\/li>\n
      • Microconvex transducers.<\/span><\/li>\n
      • Specialised rectal transducers.<\/span><\/li>\n
      • High-frequency transducers for small animals.<\/span><\/li>\n<\/ul>\n

        There is no single transducer that is optimal for every species or application.<\/span><\/p>\n

        Software and imaging modes<\/b><\/p>\n

        B-mode is the most commonly used mode in reproductive ultrasound.<\/span><\/p>\n

        It provides real-time two-dimensional imaging of structures such as:<\/span><\/p>\n

          \n
        • Uterus.<\/span><\/li>\n
        • Gestational sac.<\/span><\/li>\n
        • Embryo or foetus.<\/span><\/li>\n
        • Foetal heartbeat.<\/span><\/li>\n
        • Ovarian follicles.<\/span><\/li>\n
        • Corpus luteum.<\/span><\/li>\n
        • Uterine fluid.<\/span><\/li>\n<\/ul>\n

          Some systems also include colour Doppler or pulsed-wave Doppler to provide additional information about blood flow.<\/span><\/p>\n

          The presence of Doppler does not automatically mean that B-mode image quality will be better. Image quality also depends on the transducer, processor, system configuration, and operator skill.<\/span><\/p>\n

          1.2. How ultrasound images are produced<\/b><\/h3>\n

          The transducer sends sound waves into the animal\u2019s body.<\/span><\/p>\n

          As the waves pass through tissues with different acoustic properties, part of the energy is reflected back to the transducer.<\/span><\/p>\n

          The ultrasound system analyses:<\/span><\/p>\n

            \n
          • Time taken for the signal to return.<\/span><\/li>\n
          • Strength of the reflected signal.<\/span><\/li>\n
          • Location of the signal.<\/span><\/li>\n<\/ul>\n

            and converts this information into an image on the screen.<\/span><\/p>\n

            On an ultrasound image:<\/span><\/p>\n

              \n
            • Fluid usually appears black or very dark.<\/span><\/li>\n
            • Soft tissue appears in different shades of grey.<\/span><\/li>\n
            • Strongly reflective structures appear brighter.<\/span><\/li>\n<\/ul>\n

              Correct interpretation depends heavily on anatomical knowledge and transducer orientation.<\/span><\/p>\n

              1.3. Depth and resolution<\/b><\/h3>\n

              Transducer frequency directly affects imaging performance.<\/span><\/p>\n

              Higher frequency<\/b><\/p>\n

                \n
              • Better resolution.<\/span><\/li>\n
              • More suitable for superficial structures or small animals.<\/span><\/li>\n
              • Lower penetration depth.<\/span><\/li>\n<\/ul>\n

                Lower frequency<\/b><\/p>\n

                  \n
                • Greater penetration.<\/span><\/li>\n
                • More suitable for deeper structures or larger animals.<\/span><\/li>\n
                • Usually lower spatial resolution.<\/span><\/li>\n<\/ul>\n

                  Frequency should therefore be selected according to the depth of the structure being examined rather than simply choosing the sharpest possible image.<\/span><\/p>\n

                  2. Main applications of ultrasound in reproductive management<\/b><\/h2>\n

                  2.1. Pregnancy detection<\/b><\/h3>\n

                  This is one of the most common uses of reproductive ultrasound.<\/span><\/p>\n

                  Ultrasound may help determine:<\/span><\/p>\n

                    \n
                  • Whether an animal is pregnant.<\/span><\/li>\n
                  • Presence of a gestational sac or embryo.<\/span><\/li>\n
                  • Foetal viability.<\/b><\/li>\n
                  • Whether pregnancy appears to be progressing appropriately.<\/span><\/li>\n<\/ul>\n

                    Early identification of non-pregnant animals can allow the farm to:<\/span><\/p>\n

                      \n
                    • Reassess reproductive status.<\/span><\/li>\n
                    • Plan rebreeding.<\/span><\/li>\n
                    • Reduce unnecessary non-productive waiting periods.<\/span><\/li>\n<\/ul>\n

                      2.2. Evaluation of the uterus and ovaries<\/b><\/h3>\n

                      Ultrasound may support examination of:<\/span><\/p>\n

                        \n
                      • Ovarian follicles.<\/span><\/li>\n
                      • Corpus luteum.<\/span><\/li>\n
                      • Abnormal cystic structures.<\/span><\/li>\n
                      • Uterine fluid.<\/span><\/li>\n
                      • Certain reproductive abnormalities.<\/span><\/li>\n<\/ul>\n

                        These findings may be combined with:<\/span><\/p>\n

                          \n
                        • Oestrus records.<\/span><\/li>\n
                        • Breeding dates.<\/span><\/li>\n
                        • Clinical examination.<\/span><\/li>\n
                        • Reproductive history.<\/span><\/li>\n<\/ul>\n

                          to support breeding or treatment planning.<\/span><\/p>\n

                          2.3. Estimation of gestational age<\/b><\/h3>\n

                          Gestational age may be estimated using features such as:<\/span><\/p>\n

                            \n
                          • Gestational sac size.<\/span><\/li>\n
                          • Embryonic size.<\/span><\/li>\n
                          • Crown\u2013rump length.<\/span><\/li>\n
                          • Development of specific anatomical structures.<\/span><\/li>\n<\/ul>\n

                            Accuracy depends on:<\/span><\/p>\n

                              \n
                            • Species.<\/span><\/li>\n
                            • Stage of pregnancy.<\/span><\/li>\n
                            • Structure being measured.<\/span><\/li>\n
                            • Operator experience.<\/span><\/li>\n<\/ul>\n

                              Gestational-age information may support:<\/span><\/p>\n

                                \n
                              • Estimation of expected parturition date.<\/span><\/li>\n
                              • Dry-off planning.<\/span><\/li>\n
                              • Nutritional management.<\/span><\/li>\n
                              • Preparation of calving or farrowing areas.<\/span><\/li>\n<\/ul>\n

                                2.4. Assessment of foetal viability<\/b><\/h3>\n

                                Ultrasound may help assess foetal viability through:<\/span><\/p>\n

                                  \n
                                • Foetal heart activity.<\/span><\/li>\n
                                • Foetal movement.<\/span><\/li>\n
                                • Development appropriate for gestational age.<\/span><\/li>\n
                                • Other relevant imaging findings.<\/span><\/li>\n<\/ul>\n

                                  Foetal death should not be concluded from a single isolated image without appropriate assessment of the relevant signs.<\/span><\/p>\n

                                  2.5. Determining litter size<\/b><\/h3>\n

                                  In species such as sheep and goats, ultrasound may help distinguish:<\/span><\/p>\n