{"id":5927,"date":"2025-06-24T11:02:26","date_gmt":"2025-06-24T05:32:26","guid":{"rendered":"https:\/\/babrone.avfu.ac.in\/blog\/?p=5927"},"modified":"2025-09-19T10:14:23","modified_gmt":"2025-09-19T04:44:23","slug":"understanding-uterine-inertia-in-bitches-a-hidden-threat-during-whelping","status":"publish","type":"post","link":"https:\/\/babrone.avfu.ac.in\/blog\/?p=5927","title":{"rendered":"Understanding Uterine Inertia in Bitches: A Hidden Threat During Whelping"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #000000;\"><strong>Parishmita Das<sup>1<\/sup>, Hunmili Ronghangpi<sup>1<\/sup>, Jini Ghosh<sup>1<\/sup>, and Mohua Das Gupta<sup>2*<\/sup><\/strong><\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #000000;\">Department of Animal Reproduction, Gynaecology and Obstetrics, College of Veterinary Science, AAU, Khanapara, Guwahati-781022<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #000000;\"><sup>1<\/sup>M.V.Sc scholar; <sup>2<\/sup>Assistant Professor<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #000000;\">*Corresponding author, Email: <a style=\"color: #000000;\" href=\"mailto:mohua.dgupta@gmail.com\">mohua.dgupta@gmail.com<\/a><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Introduction<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">For most dog owners, the birth of a new litter is a moment of anticipation and joy. However, for some bitches, this natural event can become life-threatening due to a serious condition known as <strong>Uterine Inertia<\/strong>. It is one of the most frequent yet underdiagnosed causes of <strong>dystocia<\/strong> (difficult or obstructed labour) in dogs and can result in the death of both mother and pups if not promptly managed.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Uterine Inertia occurs when the uterus either fails to initiate contractions or cannot maintain them long enough to complete the birthing process. Despite being a frequent condition, it often goes unnoticed until it becomes an emergency.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Understanding the Uterus and Its Role in Labour<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">During normal whelping, two forces help expel the puppies:<\/span><\/p>\n<ol style=\"text-align: justify;\">\n<li><span style=\"color: #000000;\"><strong>Myometrial contractions<\/strong> (involuntary contractions of the uterus)<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Abdominal straining<\/strong> (voluntary muscular effort)<\/span><\/li>\n<\/ol>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Myometrial contractions are the first to act, pushing the foetus into the birth canal, which then stimulates abdominal muscles through reflexes to aid in expulsion. When uterine contractions are weak or absent, the abdominal muscles are not activated properly, leading to <strong>ineffective labour (<\/strong>Roberts,1971).<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Types of Uterine Inertia: Primary vs. Secondary<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Primary Uterine Inertia (PUI)<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">This is the most common form and is frequently observed in multiparous bitches (those that have had multiple pregnancies). It occurs when:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li><span style=\"color: #000000;\">The uterus never starts contracting (complete PUI), or<\/span><\/li>\n<li><span style=\"color: #000000;\">It begins contracting but stops before delivering all the puppies (partial PUI).<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Causes of Primary Uterine Inertia (<\/strong>Noakes <em>et al<\/em>., 2018)<\/span><\/p>\n<ol style=\"text-align: justify;\">\n<li><span style=\"color: #000000;\"><strong>Overdistension of the Uterus<\/strong>: Large litters or very big foetuses (common in breeds like Bulldogs or Pugs) stretch the uterus excessively, reducing its ability to contract.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Single Puppy Syndrome<\/strong>: A small litter (often just one or two pups) may fail to produce enough hormonal signals to initiate labour.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Hormonal Imbalance<\/strong>: Normal parturition depends on a precise balance between <strong>oestrogen and progesterone<\/strong>. High progesterone levels inhibit uterine activity, while a rise in oestrogen promotes it. Any disruption in this balance can prevent contractions.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Oxytocin or Prostaglandin Deficiency<\/strong>: When the foetus stretches and applies pressure on the cervix, the Ferguson reflex is triggered. This reflex stimulates the hypothalamus, specifically the paraventricular nucleus, to release oxytocin. Oxytocin then binds to its receptors on the smooth muscle cells of the myometrium, promoting uterine contractions. Additionally, oxytocin stimulates the production of prostaglandins, which aid in cervical dilation and enhance uterine muscle activity. A deficiency in either hormone can impair this process and myometrial contraction.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Hypocalcaemia (Low Blood Calcium)<\/strong>: Calcium is crucial for muscle contractions, including those of the uterus. A deficiency can significantly reduce uterine contractility.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Fat Deposits in the Uterine Wall<\/strong>: Excess fat infiltration can reduce muscle tone and efficiency.<\/span><\/li>\n<\/ol>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Clinical Signs of Primary Uterine Inertia<\/strong><\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li><span style=\"color: #000000;\">Restlessness, panting, and nesting behaviour without active labour.<\/span><\/li>\n<li><span style=\"color: #000000;\">Drop in rectal temperature (indicating impending labour) but no straining.<\/span><\/li>\n<li><span style=\"color: #000000;\">Dilated cervix but no progress in delivery.<\/span><\/li>\n<li><span style=\"color: #000000;\">Green vaginal discharge (uteroverdin) suggesting placental separation but no pup delivered.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Diagnosis<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Diagnosis is based on:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li><span style=\"color: #000000;\"><strong>History<\/strong> (number of pregnancies, duration of labour signs).<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Clinical examination<\/strong> (abdominal palpation, vaginal inspection).<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Ultrasound<\/strong> to check for foetal movement and heartbeat, confirming viability.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Treatment of Primary Uterine Inertia<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Veterinary intervention should be immediate and calculated:<\/span><\/p>\n<ol style=\"text-align: justify;\">\n<li><span style=\"color: #000000;\"><strong>Digital Vaginal Stimulation (Feathering)<\/strong>: Can induce natural oxytocin release.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Fluid Therapy<\/strong>: Administering IV fluids like dextrose 5% DNS\/ 0.9% saline helps to correct dehydration and restore energy.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Calcium Gluconate (IV)<\/strong>: Corrects subclinical hypocalcaemia and strengthens uterine contractions @ 0.5-1.5 ml\/kg body weight (Raut <em>et al<\/em>., 2009).<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Oxytocin Injections<\/strong>: Carefully administered in low doses (0.5\u20135 IU IV), only when the uterus is not overfilled.<\/span>\n<ul>\n<li><span style=\"color: #000000;\"><strong>Important Note<\/strong>: Oxytocin should <strong>not<\/strong> be used if there is uterine over-distension as it may cause rupture (Uvn\u00e4s-Moberg, 2024).<\/span><\/li>\n<\/ul>\n<\/li>\n<li><span style=\"color: #000000;\"><strong>Manual Assistance<\/strong>: Gentle traction if the birth canal is clear and the pup is accessible.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Caesarean Section<\/strong>: Indicated when medical management fails or if pups are at risk. Prompt surgery saves lives.<\/span><\/li>\n<\/ol>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Secondary Uterine Inertia: When the Uterus Gives Up<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Unlike primary inertia, <strong>secondary uterine inertia<\/strong> happens when the uterus becomes exhausted after prolonged or obstructed labour (Roberts,1971). The bitch may successfully deliver one or two pups but then stops due to muscular fatigue.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Causes Include (<\/strong>Magnus <em>et al<\/em>., 2023)<strong>:<\/strong><\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li><span style=\"color: #000000;\">Prolonged labour<\/span><\/li>\n<li><span style=\"color: #000000;\">Foetal obstruction<\/span><\/li>\n<li><span style=\"color: #000000;\">Partial cervical dilation<\/span><\/li>\n<li><span style=\"color: #000000;\">Large or malformed puppies<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Clinical Signs of Secondary Uterine Inertia<\/strong><\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li><span style=\"color: #000000;\">Strong initial labour with delivery of one or two puppies.<\/span><\/li>\n<li><span style=\"color: #000000;\">Sudden cessation of contractions.<\/span><\/li>\n<li><span style=\"color: #000000;\">Remaining foetuses often become non-viable due to lack of oxygen.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Diagnosis and Treatment<\/strong><\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li><span style=\"color: #000000;\">Similar diagnostic methods as PUI.<\/span><\/li>\n<li><span style=\"color: #000000;\">If obstruction is ruled out, medical therapy (fluids, calcium, oxytocin) can be attempted.<\/span><\/li>\n<li><span style=\"color: #000000;\">Caesarean section is the best option when labour does not resume, especially if live foetuses are present.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Prognosis<\/strong>: Guarded. Delay in treatment increases risks of foetal death, uterine rupture, infections, and metritis.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Preventive Measures for Breeders and Pet Owners (<\/strong>Jyothi and Gunaranjan, 2023)<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li><span style=\"color: #000000;\">Regular prenatal check-ups.<\/span><\/li>\n<li><span style=\"color: #000000;\">Nutritional support with calcium and energy supplements during late gestation.<\/span><\/li>\n<li><span style=\"color: #000000;\">Monitoring for early signs of labour.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Administration of oxytocin at home<\/strong> <strong>should never be attempted<\/strong> without veterinary supervision.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Conclusion: <\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Uterine Inertia is a condition that demands quick recognition and decisive action. Whether caused by hormonal imbalance, overdistension, or muscle exhaustion, the result is the same &#8211; interrupted birth with dire consequences if untreated.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Veterinarians play a crucial role in diagnosis, medical management, and surgical intervention. With growing awareness and timely care, both puppies and their mothers can be saved from the fatal grasp of this silent threat.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong><br \/>\n<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>&nbsp;<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>References: <\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Jyothi, K. and Gunaranjan, K.S. (2023). Management of primary uterine inertia in female dogs. <em>Ind. J. Canine<\/em> Pract. <strong>15<\/strong>(2): 118-120.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Magnus, P.K.; Jayakumar, C.; Naicy, T.; Lali, F.A.; Hiron, M.H.; Abhilash, R.S. and Ajithkumar, S. (2023). Etiology behind canine uterine inertia: Role of uterine expression of MLCK4, MYH2 and PKC genes. <em>Animal Reproduction Science<\/em>. <strong>256<\/strong>: 107298.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Noakes, D.E.; Parkinson, T.J. and England, G.C. (Eds.). (2018). <em>Arthur&#8217;s Veterinary Reproduction and Obstetrics-E-Book: Arthur&#8217;s Veterinary Reproduction and Obstetrics-E-Book<\/em>. Elsevier Health Sciences.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Raut, B.M.; Dhakate, M.S.; Upadhye, S.V.; Khan, L.A.; Khante, G.S.; Tiple, A.V. and Donekar, M.N. (2009). Uterine inertia in bitch. <em>Veterinary World<\/em>. <strong>2<\/strong>(2): 71.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Roberts, S.J. (1971). Veterinary Obstetrics and Genital Diseases. Published by Author, Ithaca, NY, 2<sup>nd<\/sup> edn. pp.227-235.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Uvn\u00e4s-Moberg, K. (2024). The physiology and pharmacology of oxytocin in labour and the peripartum period. <em>American Journal of Obstetrics and Gynaecology<\/em>. <strong>230<\/strong>(3): S740-S758.<\/span><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/babrone.avfu.ac.in\/blog\/wp-content\/uploads\/2025\/06\/uterine-inertia.pdf\">Download PDF<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Parishmita Das1, Hunmili Ronghangpi1, Jini Ghosh1, and Mohua Das Gupta2* Department of Animal Reproduction, Gynaecology and Obstetrics, College of Veterinary Science, AAU, Khanapara, Guwahati-781022 1M.V.Sc scholar; 2Assistant Professor *Corresponding author, Email: mohua.dgupta@gmail.com Introduction For most dog owners, the birth of a new litter is a moment of anticipation and joy. However, for some bitches, this&#8230;<\/p>\n","protected":false},"author":2,"featured_media":5928,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[453,1],"tags":[],"class_list":["post-5927","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article33th-issue","category-articles"],"_links":{"self":[{"href":"https:\/\/babrone.avfu.ac.in\/blog\/index.php?rest_route=\/wp\/v2\/posts\/5927","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/babrone.avfu.ac.in\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/babrone.avfu.ac.in\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/babrone.avfu.ac.in\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/babrone.avfu.ac.in\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5927"}],"version-history":[{"count":2,"href":"https:\/\/babrone.avfu.ac.in\/blog\/index.php?rest_route=\/wp\/v2\/posts\/5927\/revisions"}],"predecessor-version":[{"id":5931,"href":"https:\/\/babrone.avfu.ac.in\/blog\/index.php?rest_route=\/wp\/v2\/posts\/5927\/revisions\/5931"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/babrone.avfu.ac.in\/blog\/index.php?rest_route=\/wp\/v2\/media\/5928"}],"wp:attachment":[{"href":"https:\/\/babrone.avfu.ac.in\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5927"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/babrone.avfu.ac.in\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5927"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/babrone.avfu.ac.in\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5927"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}