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Ultrasonographic Diagnosis and Clinical Management of Pseudopregnancy in Goats

Hydrometra, a synonymous of pseudopregnancy is a major cause of infertility in goats with varying incidences ranging from 1.37-20%. Four pluriparous goats were presented to the referral VGO polyclinic with the history of mating, nearly completed or prolonged gestation period, varying degree of abdominal distension and no signs of imminent kidding. The ultrasonography and X-ray examination revealed that animals were non-pregnant and contain hypoechoic fluid in the uterus. The cases were diagnosed as hydrometra and treatment consisting of cloprostenol sodium (PGF2α analogue), valethamate bromide, estradiol benzoate along with dexamethasone was given for evacuation of the uterine contents. All of the animals responded to treatment about 18-20 h later with varying success in uterine evacuation. Thus, the present article highlights the ultrasonographic diagnosis and therapeutic management of hydrometra in goats.

Pseudopregnancy also known as "hydrometra" or "cloudburst" in goats is the accumulation of sterile secretions within the uterine lumen with unknown etiology and pathophysiology (Purohit and Mehta, 2012). It is the most frequent noninfectious cause of infertility or subfertility in dairy goats (Kornalijnslijper et al., 1997) with an incidence ranging of 1.37-20% in various herds worldwide (Mialot et al., 1991;Hessenlink et al., 1993;Griffiths et al., 2006;Barna et al., 2017;Desire et al., 2017;Maia et al., 2018;Almubarak et al., 2018). Hydrometra in goat is always found to be associated with high progesterone levels secreted by persistent corpus luteum (CL), cessation of cyclical activity, variable degree of abdominal distension and absence of fetal parts and membranes (Pieterse and Taverene, 1986;Smith, 2009). Pseudopregnancy in goats occurs both after mating and without mating. After mating fertilization followed by embryonic death, persistence of CL may lead to enlargement of abdomen, some degree of udder development which usually lasts for duration of gestation period or longer till regression of CL leading to evacuation of large amount of cloudy fluid. It can also occur when doe was in estrus and not mated, there is cessation of cyclical ovarian activity but there is no marked hydrometra and at the end of period of acyclicity, affected does expel a bloody discharge (Smith, 1986). The disease occurs in older does mostly and is uncommon in yearlings (Smith, 2009) causing major economic losses to small and marginal livestock owners. Since the introduction of ultrasonography (USG) for pregnancy detection, the goats are easily differentially diagnosed with hydrometra, but without this technique, females with marked abdominal distension are recognized with hydrometra only because of lack of kidding at the expected time (Pieterse and Taverene, 1986;Smith and Sherman, 2009). Although no other complications in female health have been observed, hydrometra certainly impairs the reproductive performance of dairy goats (Mortel, 2001). This study consists of varying degree of hydrometra in four goats presented to VGO polyclinic of the institute, their diagnosis using USG, successful treatment with combination therapy of Prostaglandin F 2 α, Valethamate bromide .,Estradiol valerate and Dexamethasone with future reproductive performance follow-up.
The four pluriparous goats of varying age and parity were presented to the Referral Veterinary Polyclinic of the institute with history of normal appetite, mating with prolonged or normally completed gestation periods, varying degree of gradual abdominal distension, with/ without cervical discharge where owners were complaining about no kidding even the gestation period completed or prolonged. The particulars of all animals with general and gynecological examination are listed in Table 1.
After taking proper history of animals, the animals were underwent X-ray and per-rectal USG examination which revealed that there were no fetal structures in the womb of the goats. The uterus of the animals were distended with varying degree and USG findings revealed presence of anechoic to hypoechoic fluid. The history along with the clinical examinations of the animals confirmed that these were the cases of hydrometra.
The confirmation of hydrometra after USG findings was followed by treatment viz., three animals were given treatment consisting of cloprostenol sodium (Vetmate ® -Cargill, India) 250 micrograms IM along with estradiol benzoate (Estogen ® ) 5 mg IM and Valethamate bromide (Epidocin ® -TTK, India) 16 mg IM and dexamethasone (Dexona ® -Zydus, India) 2.5 mg IM, while animal no. 2 which was already having the cervical discharge, given only cloprostenol sodium (Vetmate ® -Cargill, India) 250 micrograms IM with dexamethasone (Dexona ® -Zydus, India) 2.5 mg IM. All of the animals started evacuation of cloudy watery fluid within 24 h of the therapy. One of the animals (no. 3) was having severe abdominal distension and as the evacuation of fluids was not completed even after 3 days so the same therapy was repeated again and the animal evacuated around a total of 4-5 litres of fluid. The cases were followed upto 2 months of the therapy and only one animal came in estrus after about 20 days of treatment while rest did not show any estrus behaviour.
The treatment of hydrometra involves emptying of the uterus usually by one or two parenteral administrations of PGF 2 α, (Pieterse and Taverne, 1986). In this study, in addition to prostaglandin F 2 α analogue, estradiol benzoate and valethamatebromide were also given to three animals for the cervical ripening and dilatation. PGF 2 α is given as a resort of treatment because of its ability to do luteolysis followed by cervical dilatation and evacuation of uterine contents. In some females, however, complete drainage of the fluid was not achieved after the use of two doses of PGF 2 α (Souza et al., 2013) which is also true in this study where one animal did not evacuate completely. In this study reinitition of reproductive cycles does not occur following treatment as reported previously by various workers (Pieterse and Taverne, 1986;Martel, 2001;Souza et al. 2013). This may also be attributed to the season because the cases were presented in the month of May and June which is not the actual breeding season of the goat (Short day breeders). Maia et al. (2018) reported that three doses of d-cloprostenol alone at an interval of 10 days were effective for the complete drainage  Barna et al. (2017) found double injection of PGF 2 α at 11 days interval as successful treatment of hydrometra followed by 64% subsequent pregnancy rate. Hydrosalpinx had also been reported concomitantly with hydrometra, which may be a cause of fetal loss after and failure of implantation leading to accumulation of fluid in the uterus (Strandell, 2000;Margalioth et al. 2006;Maia et al. 2018). Almubarak et al. (2016); Farliana and Yimer (2016) and Balamurugan et al. (2018) also diagnosed hydrometra in a goat via USG with subsequent use of single injection of cloprostenol sodium for evacuation of uterine contents and returning of the goat to estrus 36 h following the therapy.

SUMMARY
It has been concluded from the present study that USG is a promising diagnostic tool for the diagnosis of hydrometra in goats. The simultaneous use of cloprostenol sodium, valethamatebromide and estradiol benzoate is also a good therapeutic regimen for early clinical management of the pseudopregnancy in goats.