Related Experiment Video
Updated: Jul 10, 2026

Mouse Model of Surgical Uterine Injury and Subsequent Pregnancy Outcomes
Published on: June 27, 2025
Fetal dystocia in a crossbred jenny due to forelimb flexion and fetopelvic disproportion
P V B Silva1, J M Alonso2, M D S Almeida1
1Veterinary Teaching Clinic Dr. Mário Alves Ribeiro, College of Veterinary Medicine, Federal University of Acre, Rodovia BR-364, km 04, Distrito Industrial, Rio Branco, AC, 69920-900, Brazil.
Dystocia in jennies is rare and requires prompt diagnosis and intervention to preserve maternal health. This report aimed to describe a case of fetal dystocia in a crossbred primiparous jenny presented after approximately seven hours in the second stage of parturition, highlighting the obstetric diagnosis, therapeutic approach, and clinical outcome. Obstetric examination revealed anterior presentation, right lateral position, bilateral carpal joint flexion, head deviation, fetal death and fetopelvic disproportion. Following sacrococcygeal epidural anesthesia, corrective obstetric maneuvers were attempted but were unsuccessful. Partial fetotomy of the thoracic limbs was performed, followed by cephalic repositioning using an obstetric hook, allowing vaginal fetal extraction. No additional birth canal injuries were observed. Despite the lack of specific fetotomy instruments, technical adaptations allowed successful completion of the procedure. The jenny showed satisfactory clinical recovery, remaining standing with spontaneous food and water intake. Postural correction associated with partial fetotomy effectively resolved dystocia while preserving maternal integrity.
Dystocia in jennies is rare and requires prompt diagnosis and intervention to preserve maternal health. This report aimed to describe a case of fetal dystocia in a crossbred primiparous jenny presented after approximately seven hours in the second stage of parturition, highlighting the obstetric diagnosis, therapeutic approach, and clinical outcome. Obstetric examination revealed anterior presentation, right lateral position, bilateral carpal joint flexion, head deviation, fetal death and fetopelvic disproportion. Following sacrococcygeal epidural anesthesia, corrective obstetric maneuvers were attempted but were unsuccessful. Partial fetotomy of the thoracic limbs was performed, followed by cephalic repositioning using an obstetric hook, allowing vaginal fetal extraction. No additional birth canal injuries were observed. Despite the lack of specific fetotomy instruments, technical adaptations allowed successful completion of the procedure. The jenny showed satisfactory clinical recovery, remaining standing with spontaneous food and water intake. Postural correction associated with partial fetotomy effectively resolved dystocia while preserving maternal integrity.
Related Concept Videos
Nondisjunction
Nondisjunction
Nondisjunction
Teratogenicity
Dihybrid Crosses
Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...
