Lack of effect of transrectal ultrasonography with restraint on lambing rate and prolificacy in ewes

Wurst, Aimee; Dixon, A.B.; Inskeep, E. K.

doi:10.1016/j.theriogenology.2007.07.019

Cited by 6 publications

(6 citation statements)

References 24 publications

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“…The application of transrectal ultrasonography started during the mid-90s (GINTHER and KOT, 1994;RAVINDRA et al 1994;RUBIANES et al 1996). This imaging method is considered non-invasive, produces minimal stress or discomfort to the animal (WURST et al 2007) and has been considered an important tool to evaluate follicular growth dynamics, ovarian response in estrus synchronization protocols (Barret et al 2002) and superovulatory response in sheep (BARRET et al 2012;MEINECKE-TILLMANN 2017).…”

Section: Follicular Dynamics Ultrasonographymentioning

confidence: 99%

Ovarian Superstimulation Treatment for Multiple Ovulation and Embryo Transfer Programs in Sheep

Maciel¹,

Rodriguez²,

Silva³

et al. 2017

INVESTIGACAO

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Superovulation in sheep aims to provide hormonal preparations to stimulate growth and ovulation of a higher number of preovulatory follicles. It is a decisive step in ewes multiple ovulation and embryo transfer, although still has results with high variability. Several studies have been performed to obtain a homogeneous and satisfactory answer to this biotechnology, although a better understanding of this phenomena is still required, taking into account the estrous cycle, physiological hormonal regulation and biological phenomenon of follicular dynamics. Considering the importance of superovulation in MOET technique in sheep, this review aims to approach the key aspects of this event in ewes (reproductive physiological phenomena and treatment of superovulation).

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Section: Follicular Dynamics Ultrasonographymentioning

confidence: 99%

Ovarian Superstimulation Treatment for Multiple Ovulation and Embryo Transfer Programs in Sheep

Maciel¹,

Rodriguez²,

Silva³

et al. 2017

INVESTIGACAO

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“…Although transrectal ultrasound has been reported to be safe in ewes [21], the application of this approach under field conditions has limitations, requiring a dorsal recumbent position of the ewe for optimal probe contact and ultrasound imaging [13,21]. This positioning is laborious and stressful to both the ewe and technician.…”

Section: Introductionmentioning

confidence: 99%

Transabdominal ultrasound for detection of pregnancy, fetal and placental landmarks, and fetal age before Day 45 of gestation in the sheep

et al. 2016

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Detection of pregnancy during early gestation is advantageous for flock breeding management. Transabdominal ultrasound is a practical and efficient approach for monitoring pregnancy and fetal growth in small ruminants. However, there is limited information using the transabdominal technique before day (d) 45 of gestation in sheep. Therefore, our objective was to determine how accurately transabdominal ultrasound could be used to detect pregnancy, to identify pregnancy landmarks, and to quantify fetal length before d 45 in ewes. Multiparous Western White-faced ewes (n = 99) were estrus synchronized and exposed to one of four Dorset rams. The day a ewe was marked by a ram was considered d 0 of gestation. Ewes not remarked by d 20 were separated for ultrasonography. To detect pregnancy and landmarks, ewes were scanned three times per week between d 26.0 ± 0.3 (mean ± standard error) and d 40.0 ± 0.2. A single technician performed all scans in the right non-haired abdominal pit using a real-time portable EasiScan machine and a 5 MHz linear rectal transducer. All data were analyzed using the MIXED procedure in SAS (with repeated measures where appropriate). Due to rebreeding activity, 113 ultrasound periods were initiated. The specificity and positive predictive value were 100% during the entire study. The accuracy, sensitivity, and negative predictive value of ultrasound scanning were greater than 90% beginning at d 33 ± 1. On average, pregnancy (n = 85) was detected at d 28.7 ± 0.4 and non-pregnancy (n = 28) at d 25.5 ± 0.6. Three early fetal losses were identified at d 39.7 ± 0.7. In pregnant ewes (n = 82) the overall accuracy of fetal counting was 78%. The first observance of an enlarged uterus (P = 0.05) and pregnancy (P = 0.03) were detected earlier when multiple fetuses were developing compared with singletons. Placentome evagination was first observed earlier in triplets compared with twins and singletons (P = 0.02). Fetal length increased with day of gestation (P < 0.0001), but not fetal number (P = 0.72). A fetal number by day of gestation interaction (P = 0.01) indicated differences in fetal length at d 29 ± 1 and d 32 ± 1. These data demonstrate that a portable ultrasound using the transabdominal technique can be used to accurately determine pregnancy, identify landmarks indicative of gestation, and estimate fetal age, before d 45 of gestation in sheep.

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“…Seit den frühen 80er Jahren wird die Sonographie beim kleinen Wiederkäuer zur Trächtigkeitsuntersuchung, zur Diagnose physiologischer und pathologischer Zustände des Uterus sowie als Hilfsmittel in der assistierten Reproduktion eingesetzt (Fowler und Wilkins, 1983;Tainturnier et al, 1983;Ishwar, 1994;Youngquist und Threlfall, 2007;Gonzales-Bulnes et al, 2010;Scott, 2012 (Martin et al, 2004;Karen et al, 2006;Scott, 2012 (Fowler und Wilkins, 1983;Buckrell et al, 1986;Young-quist und Threlfall, 2007;Romano und Christians, 2008). Die transrektale Untersuchung wird in der Regel am stehenden Tier vorgenommen (Buckrell et al, 1986;Wurst et al,, 2007). Ab dem 12.…”

Section: Introductionunclassified

Sonographic diagnosis of pregnancy and determination of fetal number and gestational age in ewes

Schmid¹,

Schiess²,

Tustain³

et al. 2016

SAT

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The aim of the present study was to evaluate accuracy of transabdominal ultrasonography for pregnancy diagnosis, determination of fetal number and estimation of gestational age in ewes. A total of 1068 ewes from 8 different flocks (Swiss White Alpine n = 379, Swiss Black-Brown Mountain n = 189, Oxford-type n = 164, Ostfriesian n = 154, Texel n = 104, Lacaune x Osfriesian crossbred n = 78) was investigated using an Ovi-Scan™ ultrasound scanner with a 3.5 MHz 170° mechanical axial probe (BCF Technology Ltd., BelIshill, Great Britain). Scanning was performed transabdominally at the right inguinal region in ewes restrained in standing position. Sonographic findings were compared with lambing data recorded by the farmers. Included in the analysis were all ewes that, at the time of examination, were not pregnant and those that were pregnant between 26 and 110 days with a known lambing date and number of lambs born (n = 882). The sensitivity of pregnancy diagnosis was 97.8% and the specificity 97.6% (overall accuracy 97.8%, n = 853). Sensitivity and specificity for discrimination between single and multiple pregnancies was 95.8% and 90.5% (overall accuracy 93.9%, n = 752), respectively, when multiples were defined as positive. Discrimination between twins and triplets reached a sensitivity of 86.0% and a specificity of 99.5% (overall accuracy 98.0%, n = 458) when triplets were defined as positive. Considering a gestation period of 150 days, the mean deviation of the estimated to the effective day of gestation at examination was 5.6 ± 5.0 days (n = 781). The correlation between estimated and true gestational age was very high (r=0.936, P<0.0001). In conclusion, a highly accurate and efficient diagnosis of pregnancy with reliable estimation of fetal number and age is possible using an Ovi-Scan™ ultrasound scanner by an experienced examiner.

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Lack of effect of transrectal ultrasonography with restraint on lambing rate and prolificacy in ewes

Cited by 6 publications

References 24 publications

Ovarian Superstimulation Treatment for Multiple Ovulation and Embryo Transfer Programs in Sheep

Ovarian Superstimulation Treatment for Multiple Ovulation and Embryo Transfer Programs in Sheep

Transabdominal ultrasound for detection of pregnancy, fetal and placental landmarks, and fetal age before Day 45 of gestation in the sheep

Sonographic diagnosis of pregnancy and determination of fetal number and gestational age in ewes

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