Diagnosing Postpartum Uterine Diseases in Farm Animals: A Practical Clinical Approach

The postpartum period is a critical phase in the reproductive cycle of farm animals, during which the uterus undergoes involution, bacterial clearance, endometrial repair, and the resumption of ovarian activity^1,2,3,4. While bacterial contamination of the uterus is common immediately after parturition, most healthy animals eliminate these microorganisms through effective uterine contractions, immune defenses, and tissue regeneration. When these protective mechanisms are compromised, postpartum uterine disease can develop, leading to delayed uterine involution, impaired fertility, prolonged calving intervals, reduced milk production, and increased treatment costs^1,5,6. 

For practicing veterinarians, timely recognition of uterine disease is essential. No single diagnostic method provides all the answers, making a systematic clinical evaluation the most reliable approach. Combining physical examination with appropriate diagnostic tools helps differentiate normal postpartum changes from clinically significant uterine disease. 

Begin with a Thorough Clinical Examination 

Clinical assessment remains the cornerstone of diagnosis. A complete reproductive examination should consider the stage of the postpartum period alongside the animal's clinical history and presenting signs. 

Conditions such as retained placenta, dystocia, twin births, stillbirths, and metabolic disorders increase the likelihood of postpartum uterine disease and should heighten clinical suspicion¹. General health status, appetite, milk production, and evidence of systemic illness can also provide valuable diagnostic clues, particularly in animals with severe uterine infections. 

Rather than relying on a single finding, veterinarians should interpret clinical observations within the context of the entire postpartum examination. 

Rectal Palpation: The First Hands-On Assessment 

Transrectal palpation remains one of the most commonly used diagnostic tools for evaluating postpartum uterine health⁵. It allows assessment of uterine involution while identifying abnormalities that may indicate ongoing inflammation. 

During palpation, attention should be directed toward: 

• General enlargement of the uterus 

• Presence of fluctuating uterine contents 

• Increased firmness or thickening of the uterine wall 

• Delayed uterine involution consistent with endometritis¹ 

Although rectal palpation provides valuable information, its findings are strengthened when interpreted alongside other diagnostic methods. 

Vaginal Examination and Vaginoscopy 

Evaluation of vaginal discharge is an important component of postpartum reproductive assessment. The presence and characteristics of vaginal contents often provide practical evidence of uterine infection¹. 

Inspection may be performed using a speculum or by inserting a clean gloved hand into the vagina to assess for purulent or mucopurulent discharge, supporting the diagnosis of metritis or clinical endometritis¹. 

Vaginoscopy offers greater sensitivity than simple external inspection when identifying purulent discharge and may improve detection of animals requiring further evaluation or treatment¹. 

Ultrasonography Adds Diagnostic Precision 

Transrectal ultrasonography has become an important tool for assessing the postpartum reproductive tract¹. In addition to complementing palpation findings, ultrasonography provides objective evaluation of uterine structures that cannot be accurately assessed manually. 

The examination enables visualization of: 

• Diameter of the uterine horns 

• Cervical size 

• Presence of intrauterine mucus 

• Accumulation of purulent material¹ 

Abnormal uterine fluid may appear as anechoic fluid containing floating particles ("snowy specks") or as more homogeneous echogenic exudate resembling surrounding uterine tissue¹. These findings help determine the extent of uterine involvement and support clinical decision-making. 

Cytology and Laboratory-Based Diagnostics 

When clinical findings remain uncertain, endometrial cytology provides valuable information regarding uterine inflammation. 

Samples may be collected using either: 

• Endometrial cytobrush 

• Low-volume uterine lavage 

The proportion of polymorphonuclear neutrophils (PMNs) is then evaluated to determine the degree of endometrial inflammation. Cytobrush sampling offers the additional advantage of collecting an in situ sample that reflects the inflammatory status of the endometrium¹. 

In selected cases, endometrial biopsy can provide detailed information about uterine health. Tissue collected using biopsy forceps allows comprehensive laboratory evaluation and may help characterize underlying pathology^1,7,8. 

Bacterial culture remains valuable when identifying the organisms responsible for uterine infection. Proper sampling techniques are essential to minimize contamination and accurately characterize both aerobic and anaerobic bacterial populations within the postpartum uterus¹. 

Practical Clinical Insights 

Successful diagnosis of postpartum uterine disease depends on combining multiple diagnostic methods rather than relying on a single examination. Rectal palpation provides an initial assessment, vaginal examination identifies abnormal discharge, ultrasonography improves visualization of uterine changes, and laboratory techniques such as cytology, biopsy, and bacterial culture offer additional confirmation when needed. 

A structured diagnostic approach facilitates earlier identification of postpartum uterine disease, allowing timely intervention before reproductive performance is significantly affected. Integrating these diagnostic tools into routine postpartum examinations can improve clinical decision-making and support better reproductive outcomes in farm animals. 

References 

1. Kalacho ND. Postpartum Uterine Diseases; Diagnostic Approaches and Management in Farm Animals: A Review. Med Discoveries. 2024;3(1):1103. https://www.researchgate.net/profile/Natinael-Kalacho/publication/378260031 

2. Sharma A, Singh M, Kumar P, Sood P, Sharma A, Thakur A. Postpartum subclinical endometritis, its diagnosis and impact on early reproductive parameters in dairy cows. Veterinarski arhiv. 2022 Jul 17;92(3):233-42. https://hrcak.srce.hr/file/407384 

3. Raliou M, Dembélé D, Düvel A, Bolifraud P, Aubert J, Mary-Huard T, Rocha D, Piumi F, Mockly S, Heppelmann M, Dieuzy-Labaye I. Subclinical endometritis in dairy cattle is associated with distinct mRNA expression patterns in blood and endometrium. PLoS One. 2019 Aug 2;14(8):e0220244. https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0220244&type=printable 

4. Rosales EB, Ametaj BN. Reproductive tract infections in dairy cows: can probiotics curb down the incidence rate?. Dairy. 2021 Jan 18;2(1):40-64. https://www.mdpi.com/2624-862X/2/1/4 

5. Negasee KA. Clinical metritis and endometritis in diary cattle: A review. Veterinary Medicine. 2020 Nov 5:51-6. https://openventio.us/index.php/VM/article/download/511/450 

6. Sharma A, Singh M, Kumar P, Sharma A, Jan AM, Sharma A, Kashyap A, Thakur A, Saini P, Gupta S. Pyometra in a Jersey crossbred cow diagnosis and treatment. Explor. Anim. Med. Res. 2018 Jun 1;8(1):97-9. https://www.researchgate.net/profile/Akshay-Sharma-37/publication/325869753 

7. Hossain MK, Uddin AH, Yasmin N, Hossain MM, Lucky NS, Haque MM, Aktaruzzaman M, Alam S. Risk factors of postpartum uterine infection and its subsequent effect on fertility of crossbred dairy cows in Bangladesh. International Journal of Natural Sciences. 2015;5(2):107-11. https://banglajol.info/index.php/iJNS/article/view/28634/19111 

8. Madoz LV, Giuliodori MJ, Migliorisi AL, Jaureguiberry M, de la Sota RL. Endometrial cytology, biopsy, and bacteriology for the diagnosis of subclinical endometritis in grazing dairy cows. Journal of dairy science. 2014 Jan 1;97(1):195-201. https://www.sciencedirect.com/science/article/pii/S0022030213007297