Conceptus loss in Santa Inês ewes carrying twin pregnancies by natural mating or embryo transfer

Ferreira-Silva, José Carlos; Neto, L. M. Freitas; Moura, Marcelo Tigre; Filho, Fernando Tenório; Oliveira, Luís Rennan Sampaio; Bartolomeu, Cláudio Coutinho; Oliveira, Marcos Antônio Lemos

doi:10.1016/j.theriogenology.2018.04.024

Cited by 4 publications

(4 citation statements)

References 29 publications

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“…This study agreement with result, the percentage of 42% of embryonic losses occur on 20 days after insemination in Merino ewes, with embryonic losses of 52.6% was for Katahdin ewes [42,55]. The adult and lamb ewes, the significant embryonic losses was (15-25%) after 30 days of pregnancy [40,54,56].…”

Section: Resultssupporting

confidence: 89%

Diagnosis of Pregnancy in Iraqi Awassi Ewes Through Progesterone Hormone Measurement and Ultrasonography Following Induction of Fertile Estrus with Sulpiride

Al-Mousawe,

Ibrahim

2024

Egyptian Journal of Veterinary Sciences

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HE aim of this study was to diagnose pregnancy in Iraqi Awassi ewes by assessing progesterone (P4) levels and using ultrasonography after inducing fertile estrus during the anestrus season with Sulpiride, a dopamine antagonist for improvement of reproductive efficiency. This study was conducted from December 2022 to June 2023, with ewes randomly divided into two groups, each consisting of 6 ewes. The treatment group received a dose of 0.6mg/kg of Sulpiride, while the control group received normal saline. The results showed a significant (P < 0.05) estrus response in the treated group. P4 concentrations were significantly higher (P < 0.05) in the treatment group on days 14, 21, and 28. However, the results of ultrasonography for pregnancy detection were non-significant in both the treatment and control groups at 30%, 60%, and 75% on days 30, 60, and 75, respectively, due to a high rate of early embryonic mortality. In conclusion, the use of Sulpiride proved to be a successful method for inducing fertile estrus in ewes, serving as a nonhormonal intervention during the seasonally anestrus period. The Seasonal anestrus is considered one of the main causes important problems in sheep, which causes Poor reproductive efficiency. P4 hormone measurement and ultrasonography were found to be rapid, safe, and reliable methods for diagnosing early pregnancy for improvement of reproductive efficiency in Iraqi Awassi ewes.

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Section: Resultssupporting

confidence: 89%

Diagnosis of Pregnancy in Iraqi Awassi Ewes Through Progesterone Hormone Measurement and Ultrasonography Following Induction of Fertile Estrus with Sulpiride

Al-Mousawe,

Ibrahim

2024

Egyptian Journal of Veterinary Sciences

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“…The conceptual loss recorded in this study (22.4%) is nearly similar to that observed in Santa Inês ewes (26.2%) carrying twin pregnancies through natural mating (Ferreira‐Silva et al., 2018). These authors noticed that most losses occurred during embryo than foetal stages.…”

Section: Discussionsupporting

confidence: 86%

Relationships among the corpus luteum, follicles and conceptus in sheep

Ali

Derar

2020

Anat Histol Embryol

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This study aimed to investigate the intra‐ and interovarian relationships among the corpus luteum (CL), the largest follicle (LF) and follicular population in non‐pregnant and between the conceptus and ovarian structures in pregnant ewes. In experiment 1, the follicular and luteal structures were examined in 538 reproductive systems of non‐pregnant Awassi ewes. The follicular population was categorised into small (SF), medium (MF) and large (LF) groups. Inter‐relationships between CL and follicular population and between LF and subordinate follicles were determined. In experiment 2, the location and number of conceptuses were identified and correlated with the ovarian structures in 58 reproductive systems of pregnant ewes. Effects of pregnancy status, stage of pregnancy, pregnancy side and conceptual number on follicular population were determined. The results showed that the right ovary was more active than the left ovary. CL had intraovarian positive effect on the number of medium and large follicles. LF had no local suppressive effect on the subordinate follicles. Side and stage of pregnancy and the conceptual number did not affect the follicular population. Accordingly, it can be concluded that the LF has no local suppressive effect on the subordinate follicles. The CL has intraovarian positive effect on the follicular population. Follicular population does not show remarkable changes during the first term of pregnancy. The present study probably provides information which may help in the understanding of the ovarian dynamics during pregnancy in sheep.

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“…Thus, the present results in naturally cycling ewe lambs, which is the physiological condition of most ewes mating as lambs, are consistent with previous results from hormonally treated animals. Some studies have shown significant embryo/fetal loss (15-25%) after Day 30 of pregnancy in both adult ewes (Dixon et al 2007;Ferreira-Silva et al 2018) and ewe lambs (Clune et al 2022). The reasons for the observed greater embryo fetal loss past Day 30 of pregnancy in those studies are unclear but could be linked to ewe breed, nutrition, presence of infectious disease, or other management (e.g.…”

Section: Discussionmentioning

confidence: 99%

Embryo development and survival in peripubertal ewe lambs

Juengel

Quirke²,

Peers-Adams³

et al. 2023

Anim. Prod. Sci.

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Context. Mating of ewe lambs can increase farm profitability, although uptake is limited by low reproductive success. Reproductive loss to Day 35 of pregnancy in peripubertal ewe lambs is greater than in adult ewes; however, the precise timing of this loss is unknown. Aim. We aimed to define more clearly early embryo development and key times of loss in peripubertal ewes. Methods. Health and development of embryos from naturally cycling crossbred ewes ~8 months of age were recorded. Following mating across 2 years, ewes were assigned to three groups (n = 80-87 per group): assessed on Day 3 of pregnancy, on Day 14, or between Day 35 and birth. For Day 3 and Day 14 groups, ewes were humanely killed, and embryos were assessed by microscope following recovery from the reproductive tract. Ultrasonography at around Days 35 and 70, and lambing data, were used to assess loss in the third group. Key results. By Day 3 of pregnancy, 22.9% of ova released were not present as healthy embryos (P < 0.05). Embryo survival on Day 14 tended (P < 0.10) to decrease further, with 34.0% (±4.5%) of ova released not present as healthy embryos. No decrease was detected between Days 14 and 35, whereas between Day 35 and birth, an additional 6.8% reproductive loss occurred (P < 0.05). Attainment of puberty prior to introduction of the fertile ram did not affect reproductive loss. Structures collected on Day 3 ranged from one cell to 12 cells: 11% (13/120) being one cell; 49% (59/120) two to four cells; and the remainder (48/120) at least five or six cells. Conceptus length at Day 14 ranged from 5.3 to 200.0 mm, with large variation between and within animals; within-ewe variation was 67% of between-ewe variation. Concentration of progesterone at time of collection was associated (P < 0.001) with developmental stage on Day 3, but not Day 14, of pregnancy. Conclusions. Reproductive loss in peripubertal ewes primarily occurred prior to Day 14, with much of this loss before Day 3. Implications. Improving oocyte and oviduct quality is important to supporting normal fertilisation and early embryo development in peripubertal ewe lambs, thus improving reproductive success.

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Conceptus loss in Santa Inês ewes carrying twin pregnancies by natural mating or embryo transfer

Cited by 4 publications

References 29 publications

Diagnosis of Pregnancy in Iraqi Awassi Ewes Through Progesterone Hormone Measurement and Ultrasonography Following Induction of Fertile Estrus with Sulpiride

Diagnosis of Pregnancy in Iraqi Awassi Ewes Through Progesterone Hormone Measurement and Ultrasonography Following Induction of Fertile Estrus with Sulpiride

Relationships among the corpus luteum, follicles and conceptus in sheep

Embryo development and survival in peripubertal ewe lambs

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