Pregnancy diagnosis in sheep and goats: a review
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Cited by (59)
Accuracy of assessment of luteal morphology and luteal blood flow for prediction of early pregnancy in goats
2018, TheriogenologyCitation Excerpt :Such findings enable an intensification of breeding programs, as non-pregnant does can be resubmitted to a second AI protocol after a shorter period when compared to a classical US pregnancy diagnosis (on Day 30 post-breeding). Moreover, the proposed methodology may be a very useful alternative for reproductive management during non-breeding season, as pregnancy diagnosis based on signs of estrus return cannot be reliably performed [27]. The earliest pregnancy diagnosis can also be adopted in resynchronization programs, in order to avoid a new ovulation and/or the necessity of additional hormones in the protocol, such as PGF2α, which could result in a loss of an undetected pregnancy.
Evaluation of the Nova Vet Meter for sheep-side monitoring of β-hydroxybutyric acid (BHBA) and description of ewe BHBA during late gestation in three flocks from the Northeastern U.S.
2018, Research in Veterinary ScienceCitation Excerpt :Tools are available to producers to improve the gestational management of flocks. By integrating ultrasound during early gestation, producers can estimate offspring gestational age and forward calculate parturition dates (Ishwar, 1995; Jones et al., 2016; Jones and Reed, 2017). Producers may also determine the number of fetuses each ewe is carrying (Jones et al., 2016; Jones and Reed, 2017).
Early pregnancy diagnosis in ewes by subjective assessment of luteal vascularisation using colour Doppler ultrasonography
2018, TheriogenologyCitation Excerpt :In both studies, pregnancy was determined with high accuracy in ewes as early as 17 days after oestrus, which may allow development of strategies for more intense reproductive management, such as early re-synchronisation of oestrus in non-pregnant ewes, saving almost 2 weeks compared with early pregnancy diagnosis done by transrectal classical ultrasound [23]. In addition, colour Doppler US may be very useful for reproductive management for out-of-season breeding, as pregnancy diagnosis based on the return of oestrus signs cannot be reliably performed [24]. Therefore, colour Doppler US in sheep is useful not only for health diagnoses [25], but also has a direct positive impact on productive and reproductive management decisions.
Ultrasonographic examination of the uterus of ewes during the post-partum period
2017, Small Ruminant ResearchCitation Excerpt :Regeneration of the superficial layer of the endometrium is considered to be complete by the 28th day post-partum. Various techniques have been proposed for the study of uterine involution in ewes, e.g., hormone measurement (Ishwar, 1995; Degefa, 2003), radiographic imaging (Tian and Noakes, 1991; Goddard, 1995), laparoscopic investigation (Ishwar, 1995) or post-mortem examination (Rubianes and Ungerfeld, 1993; Ababneh and Degefa, 2005; Degefa et al., 2006). Some of the disadvantages of the above techniques include invasiveness, reduced accuracy, difficulty to apply in clinical conditions and need to sacrifice the experimental animals.