Características Do Parto E Involução Uterina Em Ovelhas Nativas Do Pantanal Brasileiro

Fernandes, Carlos Eurico dos Santos; Cigerza, Cristiane Fabiane; Pinto, Guilherme dos Santos; Miazi, Cesar; Ferreira, Marcos Barbosa; Martins, Charles Ferreira

doi:10.5216/cab.v14i2.17926

Cited by 8 publications

(7 citation statements)

References 20 publications

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“…Mc Entee [25] reported that it takes a long period of time, even up to 49 days in ewes according to his histological findings. On the contrary, involution process was reported to be ended between 14-21 days in native Pantanal sheep [13]. Many variables like breed, lambing season, parity and suckling may affect the duration of postpartum period.…”

Section: Discussionmentioning

confidence: 99%

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B-mode and Doppler Ultrasonographic Assessment of Uterine Involution in Ewes Treated with Two Different Doses of ProstaglandinF2α

Dal

Enginler

Çetin

et al. 2020

Acta Scientiae. Vet.

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Background: Several studies consisted of postmortem evaluations and B-mode ultrasonography have been performed on ovine uterine involution. However, researches with Doppler ultrasonography are very limited in ewes. Doppler ultrasonography is a non-invasive method which provides information about vascular dynamics of the tissues which cannot be examined by B-mode ultrasonography. The aim of the study was to evaluate the effects of two different PGF2α doses on uterine measurements by real time B-mode ultrasonography; and on uterine artery hemodynamics by pulsed-wave Doppler analysis during postpartum uterine involution in ewes.Materials, Methods & Results: The study was conducted with 30 primiparous Kiwircik ewes which lambed singleton without any complication. The ewes were randomly divided into three groups (n= 10 for each group). A single i.m. injection of 125 μg/sheep PGF2α, 75 μg/sheep PGF2α, and 1.0 mL/sheep sterile saline solution were administered to Group 1, 2, and 3, respectively. The day of parturition was considered as the first day of the study. Examinations were performed on days 1, 2, 3, 7, 14, 21 and 28. Diameters of previously gravid horn and caruncles were measured by real time B-mod ultrasonography. Presence of lochia was also noted. Uterine artery pulsatility index (PI), resistance index (RI), systolic/diastolic ratio (S/D) values were measured by pulsed-wave Doppler ultrasonography. The one-way analysis of variance and Duncan’s test were used for statistical analysis. The mean previously gravid horn diameters of ewes were 8.30 ± 0.16 cm and 1.53 ± 0.07 cm on day 1 and day 28, respectively. Previously gravid horn and caruncle diameters had a similar declining pattern in all groups as involution period proceeded. Involution was mostly completed by day 21. More than 50% reduction in uterine size was achieved in prostaglandin administered groups by day 7. Caruncles were not able to be identified after the second week postpartum. Lochia was observed for a longer period in control group. Uterine artery PI and RI showed fluctuations throughout involution period with a similar pattern among groups. S/D values progressively increased until day 14, then showed a decreasing pattern.Discussion: The effects of different PGF2α doses on uterine measurements and uterine artery hemodynamics during postpartum period were compared in ewes for the first time. The uterine size reduction in prostaglandin administered groups suggested that both PGF2α doses were effective in uterine involution. The last observation of lochia in uterine cavity were achieved by day 7 in prostaglandin administered groups, suggesting both PGF2α doses trigger uterine contractions which lead to the removal of uterine content. Automatic measurements by Doppler device were taken in order to provide uniformity and to prevent operator-based bias. The significantly higher uterine artery PI value found in Group 1 on day 1 might suggest the stimulatory effect of PGF2α administration on uterine contractility synergitically with already released endogenous PGF2α. Uterine artery PI and RI showed fluctuations throughout involution period and reached their peak values on day 14. The increasing S/D values up to day 14 indicated increasing diastolic flow, increasing resistance and decreasing blood perfusion in prostaglandin administered groups. Prostaglandin administered groups tended to show higher hemodynamic parameters throughout the study which suggested a vasoconstrictor effect of PGF2α. In conclusion, PGF2α administration on the day of parturition might have constrictor effects both on uterine artery and myometrium which leads to a reduction in uterine blood flow and a rapid decline in uterine size especially during early puerperium even with a reduced dose.

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Section: Discussionmentioning

confidence: 99%

“…Ovine uterine involution has been investigated intensely by B-mode ultrasonography [13,17,19,20,26,40]. Finally, researches performed on Doppler ultrasonography in ewes have gained momentum in recent years.…”

Section: Discussionmentioning

confidence: 99%

B-mode and Doppler Ultrasonographic Assessment of Uterine Involution in Ewes Treated with Two Different Doses of ProstaglandinF2α

Dal

Enginler

Çetin

et al. 2020

Acta Scientiae. Vet.

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“…In small ruminants, accurate evaluation of the internal organs of the reproductive tract by rectal palpation is not possible (Feliciano et al, 2013) and authors reported different intervals to complete uterine involution. Studies were conducted assessing hormonal levels (Ishwar, 1995), radiography (Tian and Noakes, 1991), ultrasonography (Fernandes et al, 2013), laparotomy (Rubianes et al, 1996) or evaluation after slaughtering (Rubianes and Ungerfeld, 1993).…”

Section: Postpartum Assessment Of the Genital Tract By Ultrasonographymentioning

confidence: 99%

“…The uterine lumen and its content in a normal uterus can be easily visualized during the early stage of the puerperium, appearing enlarged and with heterogeneous echotexture due to the observation of the layers (Hauser and Bostedt, 2002), presenting up to 10 cm of diameter (Fernandes et al, 2013). As its size decreases progressively, it may be more difficult to image it after the 13 th day post-partum by transabdominal scanning, as reported by Ababneh and Degefa (2005).…”

Section: Postpartum Assessment Of the Genital Tract By Ultrasonographymentioning

confidence: 99%

Avaliação Ultrassonográfica No Pós-Parto De Ovelhas: Revisão De Literatura

Mariano¹,

Santos²,

Taira³

et al. 2020

RBRA

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“…The reproductive potential of ewes (Ovis aries L.) is closely related to the early resumption of cyclic ovarian activity after lambing (Fernandes et al, 2013). For this reason, it is necessary to manage the most important factors that inhibit post-partum ovarian activity, namely breastfeeding and nutrition (Orihuela et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Reproductive response of Pelibuey sheep to the application of recombinant bovine somatotropin and a metabolic restorative preparation

Fraire-Cordero

Rodríguez

Pérez-Hernández

et al. 2018

Pesq. agropec. bras.

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The objective of this work was to evaluate the effect of recombinant bovine somatotropin (rBST) and of the metabolic restorative preparation Metabolase (MR) on the reestablishment of the post-partum ovarian activity of Pelibuey sheep. Ninety-four ewes, with their respective lambs, were randomly assigned to one of the following treatments: T1, continuous suckling (CS); T2, CS + MR; T3, CS + rBST; and T4, CS + MR + rBST. Ovulating percentages, weight changes in ewes and lambs, incidence of estrus, onset and return to estrus, calving, fecundity, and prolificacy were evaluated. The highest ovulation percentages were recorded for CS in T1 and T2, and the lowest ones for rBST in T3 and T4. The treatments had a significant effect on lamb weight. Ewes in T3 had the lowest incidence of estrus (52.9%), besides a greater onset (26.8±1.9 hours) and return to estrus (66.6%). Calving (86.2%) and fecundity (1.8±0.2) were significantly higher in T2. The application of rBST in ewes increases lamb body weight, due to increased milk production, but affects negatively post-partum reproductive activity due to the loss of ewe body weight.

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Características Do Parto E Involução Uterina Em Ovelhas Nativas Do Pantanal Brasileiro

Cited by 8 publications

References 20 publications

B-mode and Doppler Ultrasonographic Assessment of Uterine Involution in Ewes Treated with Two Different Doses of ProstaglandinF2α

B-mode and Doppler Ultrasonographic Assessment of Uterine Involution in Ewes Treated with Two Different Doses of ProstaglandinF2α

Avaliação Ultrassonográfica No Pós-Parto De Ovelhas: Revisão De Literatura

Reproductive response of Pelibuey sheep to the application of recombinant bovine somatotropin and a metabolic restorative preparation

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