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Abstract
The use of ultrasonography as diagnostic tool is crucial in animal reproduction especially in pregnancy diagnosis and can be useful in the assessment of postpartum uterine involution. Uterine involution in does has been described using macroscopic and histological examination post-mortem. The present study was carried out to determine the time of uterine involution in live Sahel goats by measuring the uterine diameter using ultrasonography. A total of 35 non-pregnant does were estrus synchronized using 2 intramuscular injection cloprostenol (250µg/kg) at 11 days interval. All the does that came into estrus after the second treatment were allowed to run free with five bucks. Pregnancy was determined by ultrasonography and the does were monitored until successful parturition. It was found that the diameter of the uterus decreased from 88.6-118 mm on day 1 postpartum to 80.8-88.6 mm, 55.3-80.8, 45.6-55.3, 39.0-45.6 mm and 24.0-39.0 mm diameters on days 3, 7, 14, 21 and 28 postpartum respectively. In conclusion, postpartum uterine involution in Sahel does was completed by day 28 postpartum. This finding suggests that breeding of Sahel does can be considered after 28 days postpartum, particularly, in circumstances where suckling of the kids is not practicable or desired.
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References
- Ababneh, M.M. and Degefa, T. (2005). Ultrasonic assessment of puerperal uterine involution in Balady goats. Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine: 52(5):244-8. doi: 10.1111/j.1439-0442.2005.00718.x. PMID: 15943609.
- Ahmed, M., Ynzeel, J. and Majeed, A. (2016). Ultrasonographic study of uterine involution in Awassi ewes in Iraq. Al-Anbar Journal of Veterinary Sciences, 9(1), 16-21.
- Aslan, S, Findik, M., Erunal-Maral, N., Kalender, H. and Celebi, M.S.E. (2000). Comparision of Various examination methods used in ovarian diagnostics in cattle. Journal of Reproduction and Fertilization., 54: 483-493. PMID: 10916937.
- Atta, M., Zeinelabdeen, W., El Khidir, O. and Adam, A. (2012). Reproductive performance of Sudan Nilotic does fed pelleted molasses and mash sorghum based diets. Small Ruminant Research, 104(1-3), 99-103. https://doi.org/10.1016/j.smallrumres.2011.10.010
- Badawi, M. E., Makawi, S. E. A., Abdelghafar, R. M. and Ibrahim, M. T. (2014). Assessment of postpartum uterine involution and progesterone profile in Nubian goats (Capra hircus). Journal of Advanced Veterinary and Animal Research, 1(2), 36-41. DOI: 10.5455
- Baru, P., Khar, S., Gupta, R. and Luthra, R. (1983). Uterine involution in goats. Veterinary Medicine & Small Animal Clinician, 78(11), 1773-1776.
- Delgadillo, J.A, Flores, J.A, Villarreal, O., Flores, M.J, Hoyos, G., Chemineau, P., Malpaux, B. (1998). Length of postpartum anestrus in goats in subtropical Mexico: effect of season of parturition and duration of nursing. Theriogenology.15; 49(6):1209-18. doi: 10.1016/s0093-691x(98)00068-5. PMID: 10732058.
- El-Hassan, K., El-Abid, K. E., and Abu Nikhaila, A. M. A. (2009). A study on some non-genetic factors and their impact on some reproductive traits of Sudanese Nubian goats. International Journal of Dairy Science, 4, 152-158. Doi: 10.3923/ijds.2009.152.158
- Enginler, S. Ö., Sandal, A. İ., Erzengin, Ö. M., Yüksel, H., Ertürk, E., Doğan, N., Özdaş, Ö. B., Gündüz, M. C. and Baran, A. (2017). Effects of Gestation Type and Parity on Uterus Involution in Saanen Does. Animal Health Production and Hygiene, 3(1), 288-293.
- Fasulkov, I. (2014). Ultrasonography of uterine inv Journal of the Faculty of Veterinary Medicine Istanbul University, olution in goats. 40(1): 63-69.
- Fernandes, C. E., Cigerza, C. F., Pinto, G., Miazi, C., Barbosa-Ferreira, M., and Martins, C. F. (2013). Parturition characteristics and uterine involution in native sheep from Brazilian pantanal. Ciência Animal Brasileira, 14(2): 245-252. DOI: 10.5216/cab.v14i2.17926
- Freitas, V., Rondina, D., Nogueira, D. and Simplıcio, A. (2004). Post-partum anoestrus in Anglo-Nubian and Saanen goats raised in semi-arid of North-eastern Brazil. Livestock Production Science, 90(2-3), 219-226. https://doi.org/10.1016/j.livprodsci.2004.06.005
- Gazali, Y. A., Gambo, B. G., Zakariah, M., and Sonfada, M. L. (2023). Morphological characteristics of the placenta of Balami and Yankasa ewes at different stages of gestation in Maiduguri, Nigeria. Sokoto Journal of Veterinary Sciences, 21(1), 11-20.
- Greyling, J. (2000). Reproduction traits in the Boer goat doe. Small Ruminant Research, 36(2), 171-177. https://doi.org/10.1016/S0921-4488(99)00161-3
- Hauser, B. and Bostedt, H. (2002). Ultrasonographic observations of the uterine regression in the ewe under different obstetrical conditions. Journal of Veterinary Medicine Series A, 49(10), 511-516. https://doi.org/10.1046/j.1439-0442.2002.00496.x
- Hayder, M. and Ali, A. (2008). Factors affecting the postpartum uterine involution and luteal function of sheep in the subtropics. Small Ruminant Research, 79, 174-178. https://doi.org/10.1016/j.smallrumres.2008.07.023
- Hunter, R. H. (1980). Physiology and technology of reproduction in female domestic animals: Academic Press. https://doi.org/10.1016/j.smallrumres.2008.07.023
- Hussain, S.O., Hussain, K.A. and Al-Ani, A.A. (2016). Study on post-partum uterine involution by Ultrasonography and progesterone profile in local goats in Iraq. The Iraqi Journal of Veterinary Medicine, 40(1), 151-156.
- Igbokwe, I. O., Ribadu, A. Y. and Bukar, M. M. (1998). Erythrocyte glutathione concentrations in Nigerian Sahel goats. Small Ruminant Research, 30, 1-6. https://doi.org/10.1016/S0921-4488(98)00089-3
- Igbokwe, N., Sandabe U. K., Sanni, S., Wampana, B., Wiam, I.M. and Igbokwe, I.O . (2018). “Aqueous stem-bark extract of Ficussycomorus increases sperm production and pH of sperm microenvironment in growing albino rat,”. Animal Reproduction, 6(4), 509-515.
- Kwari, H. (2001). A morphological Study of the Ecotypes of Sahel Goats in Borno State with special reference to Sexual Dimorphism. A PhD Thesis, Department of Veterinary Anatomy, Faculty of Medicine, University of Maiduguri, Borno State Nigeria.
- Kwari, H. D., Sivachelvan, M.N. and G.A., C. (2004). Characterization of Sahel goats in Borno State, Nigeria for certain qualitative traits Nigerian Journal of Experimental Applied Biology, 5, 151-154.
- Lin, Y., Yang, H., Ahmad, M.J., Yang, Y., Yang, W., Riaz, H., Abulaiti, A., Zhang, S., Yang, L. and Hua, G. (2021). Postpartum uterine involution and embryonic development pattern in Chinese Holstein dairy cows. Frontiers in Veterinary Science, 7,604729. https://doi.org/10.3389/fvets.2020.604729
- Luikart, G., Gielly, L., Excoffier, L., Vigne, J.-D., Bouvet, J. and Taberlet, P. (2001). Multiple maternal origins and weak phylogeographic structure in domestic goats. Proceedings of the National Academy of Sciences, 98(10), 5927-5932. https://doi.org/10.1073/pnas.091591198
- Maina, V., Chaudhari, S. and Mshelia, G. (2006). Spermiogram of the white ecotype of Sahel bucks in Maiduguri Metropolis. Pakistan Journal of Biological Sciences, 9(2), 307-309.
- Medan, M. S. and Abd El-Aty, A. M. (2010). Advances in ultrasonography and its applications in domestic ruminants and other farm animals reproduction. Journal of Advanced Research, 1(2), 123-128. https://doi.org/10.1016/j.jare.2010.03.003
- Meile, A., Nathues, H., Kauffold, J. and Grahofer, A. (2020). Ultrasonographic examination of postpartum uterine involution in sows. Animal Reproduction Science, 219, 106540. https://doi.org/10.1016/j.anireprosci.2020.106540
- Morand-Fehr, P. and Lebbie, S. (2004). Proposals for improving the research efficiency in goats. Small Ruminant Research, 51(2), 145-153., 35(5), https://doi.org/10.1016/j.smallrumres.2003.08.012
- Mwaanga, E.S. and Janowski, T., 2000. Anoestrus in dairy cows: causes, prevalence and clinical forms. Reproduction in domestic animals, 35(5), pp.193-200. https://doi.org/10.1046/j.1439-0531.2000.00211.x
- Nyland T.G.and Mattoon J.S.(2002) Small Animal Diagnostic Ultrasound. 2nd ed. Philadelphia: WB Saunders Mwaanga, E. and Janowski, T. (2000). Anoestrus in dairy cows: causes, prevalence and clinical forms. Reproduction in Domestic Animals
- O’shea, J. D. and Wright, P. J. (1984). Involution and regeneration of the endometrium following parturition in the ewe. Cell and Tissue Research, 236, 477-485. https://doi.org/10.1007/BF00214253
- Reshma, A., Sathiamoorthy, T., Sridevi, P., Tirumurugaan, KG and Balagangatharathilagar, M. (2020). Ultrasonography of Uterine Involution in normal and metritis affected postpartum cows. Journal of Entomology and Zoology Studies, 8(3): 1823-1826.
- Rubianes, E., Ungerfeld, R., Vinoles, C., Carbajal, B., Castro, T. D. and Ibarra, D. (1996). Uterine involution time and ovarian activity in weaned and suckling ewes. Canadian Journal of Animal Science, 76(1), 153-155. https://doi.org/10.4141/cjas96-022
- Samir, H., Radwan, F., El-Khawagah, A.R., Kandiel, M., El Sayed, M.A., Elfadadny, A., Karen, A. and El-Sherbiny, H.R. (2023). Ultrasonography and computer-assisted assessment of postpartum uterine echotexture and its relationship with peripheral oxidative stress biomarkers in goats. Small Ruminant Research, 221, p.106947. https://doi.org/10.1016/j.smallrumres.2023.106947
- Sanchez, M., Garcı́a, P., Menendez, S., Sanchez, B., Gonzalez, M. and Flores, J. (2002). Fibroblastic growth factor receptor (FGF-R) expression during uterine involution in goat. Animal Reproduction Science, 69(1-2), 25-35. https://doi.org/10.1016/S0378-4320(01)00169-5
- Scott, P. R. (2012). Applications of diagnostic ultrasonography in small ruminant reproductive management. Animal Reproduction Science, 130(3-4), 184-186.https://doi.org/10.1016/j.anireprosci.2012.01.013
- Sokol, E.R., Casele, H., and Haney, E.I. (2004). Ultrasound examination of the postpartum uterus: what is normal? Journal of Maternal, Fetal and Neonatal Medicine. 15(2), 95–99. https://doi.org/10.1080/14767050310001650798
- Steininger, K. and Braun, U. (2012). Ultrasonography of the urinary tract in 29 female Saanen goats. Schweiz Arch Tierheilkd, 154(2), 67-74.
- Takayama, H., Tanaka, T. and Kamomae, H. (2010). Postpartum Ovarian activity and Uterine Involution in non-seasonal Shiba goats, with or without nursing. Small Ruminant Research, 88(1), 62-86. https://doi.org/10.1016/j.smallrumres.2009.11.001
- Taverne, M. A. and Willemse, A. H. (Eds.). (1989). Diagnostic ultrasound and animal reproduction. Kluwer Academic. https://doi.org/10.1007/978-94-017-1249-1
- Tian, W. and Noakes, D. (1991). A radiographic method for measuring the effect of exogenous hormone therapy on uterine involution in ewes. The Veterinary Record, 129(21), 463-466. https://doi.org/10.1136/vr.129.21.463 PMID: 1763467
- Van Niekerk, C. H. (1976). Limitations to female reproductive efficiency. Sheep Breeding, West Australian Insti-tute of Technology, 303-314.
- Vyas, S. and Sahani, M. S. (2000). Real-time ultrasonography of ovaries and breeding of the one-humped camel (Camelus dromedarius) during the early postpartum period. Animal Reproduction Science, 59(3-4), 179-184. https://doi.org/10.1016/S0378-4320(00)00118-4
- Wataganara, T., Phithakwatchara, N., Komoltri, C., Tantisirin, P., Pooliam, J., Titapant, V. (2015). Functional three-dimensional sonographic study of the postpartum uterus. Journal of Maternal, Fetal and Neonatal Medicine. 28, 2221–2227. https://doi.org/10.3109/14767058.2014.983063.
- Weissmann-Brenner, A., Haas, J., Barzilay, E., Gilboa, Y., Gat, I., Gindes, L., Mashiach, R., Achiron, R. and Dulitski, M. (2013). Added value of 3-dimensional sonography for endometrial evaluation in early puerperium. Journal of Ultrasound Medicine. 32(4), 587–592. https://doi.org/10.7863/jum.2013.32.4.587
- Wehrend, A., Bostedt, H. and Burkhardt, E.(2002). The use of trans-Abdominal B mode ultrasonography to diagnose intra-partum uterine torsion in the ewe. Veterinary Journal. 164(1), 69–70. doi:10.1053/tvjl.2002.073
- Yotov, S. (2 007). Early pregnancy diagnostics and determination of offspring number and gender in sheep. (Doctoral dissertation, PhD thesis, Stara Zagora.
- Zdunczyk, S., Milewski, S., Baranski, W., Janowski, T., Szczepanski, W., Jurczak, A., Ras, A. and Lesnik, M. (2004). Postpartum uterine involution in primiparous and pluriparous polish longwool sheep monitored by ultrasonography. Bulletin-Veterinary Institute in Pulawy, 48(3), 255-258.
- Zongo, M., Traoré, B., Ababneh, M. M., Hanzen, C. and Sawadago, L. (2014). Ultrasonographic assessment of uterine involution and ovarian activity in West African Sahelian goats. Journal of Veterinary Medicine and Animal Health, 7(2), 71-76. DOI: 10.5897/JVMAH2014. 0322
References
Ababneh, M.M. and Degefa, T. (2005). Ultrasonic assessment of puerperal uterine involution in Balady goats. Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine: 52(5):244-8. doi: 10.1111/j.1439-0442.2005.00718.x. PMID: 15943609.
Ahmed, M., Ynzeel, J. and Majeed, A. (2016). Ultrasonographic study of uterine involution in Awassi ewes in Iraq. Al-Anbar Journal of Veterinary Sciences, 9(1), 16-21.
Aslan, S, Findik, M., Erunal-Maral, N., Kalender, H. and Celebi, M.S.E. (2000). Comparision of Various examination methods used in ovarian diagnostics in cattle. Journal of Reproduction and Fertilization., 54: 483-493. PMID: 10916937.
Atta, M., Zeinelabdeen, W., El Khidir, O. and Adam, A. (2012). Reproductive performance of Sudan Nilotic does fed pelleted molasses and mash sorghum based diets. Small Ruminant Research, 104(1-3), 99-103. https://doi.org/10.1016/j.smallrumres.2011.10.010
Badawi, M. E., Makawi, S. E. A., Abdelghafar, R. M. and Ibrahim, M. T. (2014). Assessment of postpartum uterine involution and progesterone profile in Nubian goats (Capra hircus). Journal of Advanced Veterinary and Animal Research, 1(2), 36-41. DOI: 10.5455
Baru, P., Khar, S., Gupta, R. and Luthra, R. (1983). Uterine involution in goats. Veterinary Medicine & Small Animal Clinician, 78(11), 1773-1776.
Delgadillo, J.A, Flores, J.A, Villarreal, O., Flores, M.J, Hoyos, G., Chemineau, P., Malpaux, B. (1998). Length of postpartum anestrus in goats in subtropical Mexico: effect of season of parturition and duration of nursing. Theriogenology.15; 49(6):1209-18. doi: 10.1016/s0093-691x(98)00068-5. PMID: 10732058.
El-Hassan, K., El-Abid, K. E., and Abu Nikhaila, A. M. A. (2009). A study on some non-genetic factors and their impact on some reproductive traits of Sudanese Nubian goats. International Journal of Dairy Science, 4, 152-158. Doi: 10.3923/ijds.2009.152.158
Enginler, S. Ö., Sandal, A. İ., Erzengin, Ö. M., Yüksel, H., Ertürk, E., Doğan, N., Özdaş, Ö. B., Gündüz, M. C. and Baran, A. (2017). Effects of Gestation Type and Parity on Uterus Involution in Saanen Does. Animal Health Production and Hygiene, 3(1), 288-293.
Fasulkov, I. (2014). Ultrasonography of uterine inv Journal of the Faculty of Veterinary Medicine Istanbul University, olution in goats. 40(1): 63-69.
Fernandes, C. E., Cigerza, C. F., Pinto, G., Miazi, C., Barbosa-Ferreira, M., and Martins, C. F. (2013). Parturition characteristics and uterine involution in native sheep from Brazilian pantanal. Ciência Animal Brasileira, 14(2): 245-252. DOI: 10.5216/cab.v14i2.17926
Freitas, V., Rondina, D., Nogueira, D. and Simplıcio, A. (2004). Post-partum anoestrus in Anglo-Nubian and Saanen goats raised in semi-arid of North-eastern Brazil. Livestock Production Science, 90(2-3), 219-226. https://doi.org/10.1016/j.livprodsci.2004.06.005
Gazali, Y. A., Gambo, B. G., Zakariah, M., and Sonfada, M. L. (2023). Morphological characteristics of the placenta of Balami and Yankasa ewes at different stages of gestation in Maiduguri, Nigeria. Sokoto Journal of Veterinary Sciences, 21(1), 11-20.
Greyling, J. (2000). Reproduction traits in the Boer goat doe. Small Ruminant Research, 36(2), 171-177. https://doi.org/10.1016/S0921-4488(99)00161-3
Hauser, B. and Bostedt, H. (2002). Ultrasonographic observations of the uterine regression in the ewe under different obstetrical conditions. Journal of Veterinary Medicine Series A, 49(10), 511-516. https://doi.org/10.1046/j.1439-0442.2002.00496.x
Hayder, M. and Ali, A. (2008). Factors affecting the postpartum uterine involution and luteal function of sheep in the subtropics. Small Ruminant Research, 79, 174-178. https://doi.org/10.1016/j.smallrumres.2008.07.023
Hunter, R. H. (1980). Physiology and technology of reproduction in female domestic animals: Academic Press. https://doi.org/10.1016/j.smallrumres.2008.07.023
Hussain, S.O., Hussain, K.A. and Al-Ani, A.A. (2016). Study on post-partum uterine involution by Ultrasonography and progesterone profile in local goats in Iraq. The Iraqi Journal of Veterinary Medicine, 40(1), 151-156.
Igbokwe, I. O., Ribadu, A. Y. and Bukar, M. M. (1998). Erythrocyte glutathione concentrations in Nigerian Sahel goats. Small Ruminant Research, 30, 1-6. https://doi.org/10.1016/S0921-4488(98)00089-3
Igbokwe, N., Sandabe U. K., Sanni, S., Wampana, B., Wiam, I.M. and Igbokwe, I.O . (2018). “Aqueous stem-bark extract of Ficussycomorus increases sperm production and pH of sperm microenvironment in growing albino rat,”. Animal Reproduction, 6(4), 509-515.
Kwari, H. (2001). A morphological Study of the Ecotypes of Sahel Goats in Borno State with special reference to Sexual Dimorphism. A PhD Thesis, Department of Veterinary Anatomy, Faculty of Medicine, University of Maiduguri, Borno State Nigeria.
Kwari, H. D., Sivachelvan, M.N. and G.A., C. (2004). Characterization of Sahel goats in Borno State, Nigeria for certain qualitative traits Nigerian Journal of Experimental Applied Biology, 5, 151-154.
Lin, Y., Yang, H., Ahmad, M.J., Yang, Y., Yang, W., Riaz, H., Abulaiti, A., Zhang, S., Yang, L. and Hua, G. (2021). Postpartum uterine involution and embryonic development pattern in Chinese Holstein dairy cows. Frontiers in Veterinary Science, 7,604729. https://doi.org/10.3389/fvets.2020.604729
Luikart, G., Gielly, L., Excoffier, L., Vigne, J.-D., Bouvet, J. and Taberlet, P. (2001). Multiple maternal origins and weak phylogeographic structure in domestic goats. Proceedings of the National Academy of Sciences, 98(10), 5927-5932. https://doi.org/10.1073/pnas.091591198
Maina, V., Chaudhari, S. and Mshelia, G. (2006). Spermiogram of the white ecotype of Sahel bucks in Maiduguri Metropolis. Pakistan Journal of Biological Sciences, 9(2), 307-309.
Medan, M. S. and Abd El-Aty, A. M. (2010). Advances in ultrasonography and its applications in domestic ruminants and other farm animals reproduction. Journal of Advanced Research, 1(2), 123-128. https://doi.org/10.1016/j.jare.2010.03.003
Meile, A., Nathues, H., Kauffold, J. and Grahofer, A. (2020). Ultrasonographic examination of postpartum uterine involution in sows. Animal Reproduction Science, 219, 106540. https://doi.org/10.1016/j.anireprosci.2020.106540
Morand-Fehr, P. and Lebbie, S. (2004). Proposals for improving the research efficiency in goats. Small Ruminant Research, 51(2), 145-153., 35(5), https://doi.org/10.1016/j.smallrumres.2003.08.012
Mwaanga, E.S. and Janowski, T., 2000. Anoestrus in dairy cows: causes, prevalence and clinical forms. Reproduction in domestic animals, 35(5), pp.193-200. https://doi.org/10.1046/j.1439-0531.2000.00211.x
Nyland T.G.and Mattoon J.S.(2002) Small Animal Diagnostic Ultrasound. 2nd ed. Philadelphia: WB Saunders Mwaanga, E. and Janowski, T. (2000). Anoestrus in dairy cows: causes, prevalence and clinical forms. Reproduction in Domestic Animals
O’shea, J. D. and Wright, P. J. (1984). Involution and regeneration of the endometrium following parturition in the ewe. Cell and Tissue Research, 236, 477-485. https://doi.org/10.1007/BF00214253
Reshma, A., Sathiamoorthy, T., Sridevi, P., Tirumurugaan, KG and Balagangatharathilagar, M. (2020). Ultrasonography of Uterine Involution in normal and metritis affected postpartum cows. Journal of Entomology and Zoology Studies, 8(3): 1823-1826.
Rubianes, E., Ungerfeld, R., Vinoles, C., Carbajal, B., Castro, T. D. and Ibarra, D. (1996). Uterine involution time and ovarian activity in weaned and suckling ewes. Canadian Journal of Animal Science, 76(1), 153-155. https://doi.org/10.4141/cjas96-022
Samir, H., Radwan, F., El-Khawagah, A.R., Kandiel, M., El Sayed, M.A., Elfadadny, A., Karen, A. and El-Sherbiny, H.R. (2023). Ultrasonography and computer-assisted assessment of postpartum uterine echotexture and its relationship with peripheral oxidative stress biomarkers in goats. Small Ruminant Research, 221, p.106947. https://doi.org/10.1016/j.smallrumres.2023.106947
Sanchez, M., Garcı́a, P., Menendez, S., Sanchez, B., Gonzalez, M. and Flores, J. (2002). Fibroblastic growth factor receptor (FGF-R) expression during uterine involution in goat. Animal Reproduction Science, 69(1-2), 25-35. https://doi.org/10.1016/S0378-4320(01)00169-5
Scott, P. R. (2012). Applications of diagnostic ultrasonography in small ruminant reproductive management. Animal Reproduction Science, 130(3-4), 184-186.https://doi.org/10.1016/j.anireprosci.2012.01.013
Sokol, E.R., Casele, H., and Haney, E.I. (2004). Ultrasound examination of the postpartum uterus: what is normal? Journal of Maternal, Fetal and Neonatal Medicine. 15(2), 95–99. https://doi.org/10.1080/14767050310001650798
Steininger, K. and Braun, U. (2012). Ultrasonography of the urinary tract in 29 female Saanen goats. Schweiz Arch Tierheilkd, 154(2), 67-74.
Takayama, H., Tanaka, T. and Kamomae, H. (2010). Postpartum Ovarian activity and Uterine Involution in non-seasonal Shiba goats, with or without nursing. Small Ruminant Research, 88(1), 62-86. https://doi.org/10.1016/j.smallrumres.2009.11.001
Taverne, M. A. and Willemse, A. H. (Eds.). (1989). Diagnostic ultrasound and animal reproduction. Kluwer Academic. https://doi.org/10.1007/978-94-017-1249-1
Tian, W. and Noakes, D. (1991). A radiographic method for measuring the effect of exogenous hormone therapy on uterine involution in ewes. The Veterinary Record, 129(21), 463-466. https://doi.org/10.1136/vr.129.21.463 PMID: 1763467
Van Niekerk, C. H. (1976). Limitations to female reproductive efficiency. Sheep Breeding, West Australian Insti-tute of Technology, 303-314.
Vyas, S. and Sahani, M. S. (2000). Real-time ultrasonography of ovaries and breeding of the one-humped camel (Camelus dromedarius) during the early postpartum period. Animal Reproduction Science, 59(3-4), 179-184. https://doi.org/10.1016/S0378-4320(00)00118-4
Wataganara, T., Phithakwatchara, N., Komoltri, C., Tantisirin, P., Pooliam, J., Titapant, V. (2015). Functional three-dimensional sonographic study of the postpartum uterus. Journal of Maternal, Fetal and Neonatal Medicine. 28, 2221–2227. https://doi.org/10.3109/14767058.2014.983063.
Weissmann-Brenner, A., Haas, J., Barzilay, E., Gilboa, Y., Gat, I., Gindes, L., Mashiach, R., Achiron, R. and Dulitski, M. (2013). Added value of 3-dimensional sonography for endometrial evaluation in early puerperium. Journal of Ultrasound Medicine. 32(4), 587–592. https://doi.org/10.7863/jum.2013.32.4.587
Wehrend, A., Bostedt, H. and Burkhardt, E.(2002). The use of trans-Abdominal B mode ultrasonography to diagnose intra-partum uterine torsion in the ewe. Veterinary Journal. 164(1), 69–70. doi:10.1053/tvjl.2002.073
Yotov, S. (2 007). Early pregnancy diagnostics and determination of offspring number and gender in sheep. (Doctoral dissertation, PhD thesis, Stara Zagora.
Zdunczyk, S., Milewski, S., Baranski, W., Janowski, T., Szczepanski, W., Jurczak, A., Ras, A. and Lesnik, M. (2004). Postpartum uterine involution in primiparous and pluriparous polish longwool sheep monitored by ultrasonography. Bulletin-Veterinary Institute in Pulawy, 48(3), 255-258.
Zongo, M., Traoré, B., Ababneh, M. M., Hanzen, C. and Sawadago, L. (2014). Ultrasonographic assessment of uterine involution and ovarian activity in West African Sahelian goats. Journal of Veterinary Medicine and Animal Health, 7(2), 71-76. DOI: 10.5897/JVMAH2014. 0322