Gestación en Bovinos Parte 3: Palpación Rectal

Gestation Diagnosis in Cattle: Rectal Palpation Techniques

Introduction to the Topic

• The speaker, Varios Rivera Nieves, invites viewers to subscribe to their channel for updates on bovine reproduction discussions.

• This segment focuses on rectal palpation as a method for diagnosing gestation in cattle.

Understanding Rectal Palpation

• Rectal palpation is an ancient and direct method of diagnosing pregnancy by physically examining the reproductive organs through the rectum.

• It is considered easy, quick, cost-effective, and relatively accurate for detecting gestation and reproductive pathologies.

Preparation for Palpation

• Before performing palpation, it is essential to wear gloves and lubricate the hand shaped like a cone for easier insertion into the rectum.

• Care must be taken during examination as embryonic structures are sensitive; thus, gentle pressure should be applied.

Methodical Approach to Examination

• A systematic approach based on anatomical knowledge is crucial for effective rectal palpation.

• Four key rules guide the examination process:

• First step: Determine if the cow is pregnant.

• Second: Identify a positive sign of pregnancy before declaring her non-pregnant.

• Third: Examine all reproductive structures thoroughly before concluding.

Principles of Accurate Diagnosis

• The primary principles include achieving 100% accuracy without false positives or negatives and determining pregnancy as early as possible.

• Additional principles involve measuring fetal age and viability while providing immediate results post-examination.

Signs of Pregnancy Detected via Palpation

• Positive signs include membrane slip (the presence of amniotic fluid), placental attachment points, and detection of the fetus itself.

• Fetal size varies with gestational age; measurements can help estimate due dates accurately.

Identifying Structures During Early Gestation

• In early gestations (35 to 70 days), asymmetry in uterine horns may indicate pregnancy; specific structures can be felt during this period.

• The size of vesicles representing amniotic fluid changes over time—from a ping pong ball at 40 days to a baseball at 60 days.

Advanced Detection Techniques in Mid-Gestation

• As gestational age increases (70 to 180 days), techniques adapt since uterine retraction becomes challenging but remains necessary for accurate diagnosis.

• At this stage, fetal size ranges from that of a rat at two months up to larger sizes as gestational weeks progress.

Gestation in Cattle: Key Insights

Fetal Development and Gestation Timeline

• At six months, the fetal size is comparable to that of a medium-sized dog, with ventral descent completing between 130 to 180 days of gestation.

• The sensation of fluid accumulation during this stage creates a feeling of fluctuation; placentas can measure up to eight centimeters at this point.

• The middle uterine artery can be palpated rectally, indicating mobility and turbulence, which aids in diagnosing pregnancy but must be differentiated from the immobile internal iliac artery.

• By five months, the lateral uterine artery shows signs of pregnancy; both arteries enlarge by seven months as the fetus ascends within the uterus.

Signs of Pregnancy Detection

• A chart from Dr. Miguel Germán Ribera Gaona outlines primary and secondary signs of gestation detectable via rectal palpation related to gestational age.

• Membrane slip is felt from day 45 to 90; amniotic sac size varies significantly during this period—from ping pong ball size at 45 days to basketball size at 90 days.

• Fetal growth progresses from mouse-sized at early stages to beagle-sized by six months; cotyledons are palpable starting at half a centimeter around day 60.

Uterine Position and Final Stages

• The uterus remains pelvic until about 80 days into gestation before descending into the abdominal cavity and ascending again after seven months until term completion.

Practical Application for Diagnosis