Luteal dynamics in goats: morphological and endocrine features

Arashiro, E. K. N.; Viana, J. H. M.; Fonseca, J. F. da; Camargo, L. S. A.; Fernandes, C. A. C.; Brandão, Felipe Zandonadi

doi:10.1590/s1516-35982010000900011

Cited by 11 publications

(7 citation statements)

References 29 publications

(38 reference statements)

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“…Even if the limited number of data does not allow statistically comparisons, the same trend was not observed in current sample. In agreement with our data, Arashiro et al (26) suggested that luteal tissue growth is positively correlated with corpora lutea functionality, whereas luteal tissue area did not influence progesterone concentration (26). Namely, when corpus luteum reached its maximum size, the co-existence of one or more CL did not increase progesterone concentration (26).…”

Section: Discussionsupporting

confidence: 93%

“…In agreement with our data, Arashiro et al (26) suggested that luteal tissue growth is positively correlated with corpora lutea functionality, whereas luteal tissue area did not influence progesterone concentration (26). Namely, when corpus luteum reached its maximum size, the co-existence of one or more CL did not increase progesterone concentration (26). In goats, maximal plasma progesterone concentration has been related to the breed, with Saanen showing higher values than Alpine goats (27).…”

Section: Discussionsupporting

confidence: 92%

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Histological Feature of Ovarian Structures Throughout the Reproductive Cycle in Alpine Goats (Capra Hircus)

Groppetti

Pecile

Frattini

et al. 2019

Macedonian Veterinary Review

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The knowledge about ovarian physiology in small ruminants is still limited, especially when compared to other domestic species. Ovarian function in goats is mainly assessed by ultrasonographic techniques, whereas a quali-quantitative feature of the follicular and luteal structures throughout the reproductive cycle in naturally cycling goats is scarce. This study provides a detailed description of the functional morphology and size of 742 ovarian structures (follicles, corpora hemorrhagica and corpora lutea) in relation to the oestrus phase, the body weight and the age of 25 Alpine goats (Capra hircus). The current study demonstrated that, the number and size of the follicles were related to the stage of the reproductive cycle (P < 0.0001). Also, the mean number of follicles was high during both prepubertal anestrus and diestrus, whereas it was low in the oestrus. Large (3-4 mm in diameter) and very large follicles (> 4 mm) (P < 0.001), and small follicles (< 2 mm; P < 0.05) varied throughout the reproductive cycle, while medium follicles (2-3 mm) were invariably observed. Large and very large follicles were predominant during the diestrus phase and small follicles in the prepubertal anestrus. It is evident from the current study that the number of follicles (P < 0.05) was significantly affected with both body weight and age. On the other hand, the size of follicles was significantly affected with body weight only (P < 0.0001). These results could contribute to a deeper understanding of ovarian transformations with important implications in assisted reproductive technologies, thereby concurring in advancing the efficiency of ultrasound in breeding programs for this species.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 92%

Histological Feature of Ovarian Structures Throughout the Reproductive Cycle in Alpine Goats (Capra Hircus)

Groppetti

Pecile

Frattini

et al. 2019

Macedonian Veterinary Review

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“…; Arashiro et al. ). In the present study, CL was first detected in the first day of the oestrous cycle.…”

Section: Discussionmentioning

confidence: 97%

“…The assessment of vascularization by colour Doppler helped identifying the CL during its initial development phases. Previous studies using B-mode US have demonstrated that CL was first detected between day 2 and day 5 of the oestrous cycle (Orita et al 2000;Riesenberg et al 2001;Medan et al 2004;Simões et al 2007;Arashiro et al 2010b). In the present study, CL was first detected in the first day of the oestrous cycle.…”

Section: Discussionmentioning

confidence: 98%

Colour Doppler Ultrasonography as a Tool to Assess Luteal Function in Santa Inês Ewes

Figueira

Fonseca

Arashiro³

et al. 2015

Reprod Domestic Animals

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The aim of this study was to evaluate luteal dynamics in the Santa Inês ewes using colour Doppler (CD) ultrasonography. Oestrus was synchronized in nulliparous females (n = 18), and subsequently, they were only teased (n = 6) or teased and mated (n = 12). Blood samples were collected daily for plasma progesterone (P4 ) concentrations. Ultrasonographic images of corpora lutea (CL) in CD mode were obtained for further analysis in its largest diameter. The CD mode allowed an early sequential monitoring of CL that was visualized by the first time 0.77 ± 0.62 days after ovulation, with luteal area 29.68 ± 13.21 mm(2) . During the luteogenesis, a progressive increase was observed, followed by a plateau of luteal area, vascularization area and plasma concentrations of P4 reaching maximum values in D11 (124.0 ± 38.0 mm(2) , 52.78 ± 24.08 mm(2) and 11.23 ± 4.89 ng/ml, respectively). In the luteolysis, the plasma concentrations of P4 decreased sharply, whereas luteal and vascularization area gradually. The vascularization area was positively correlated with plasma concentrations of P4 during the luteogenesis (r = 0.22) and luteolysis (r = 0.48). The luteal dynamics of Santa Inês ewes showed patterns similar to those observed in other sheep breeds studied. The CD ultrasonography has the potential to be used as a tool to assess luteal function in sheep.

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“…In some donors, tail hair must be shaved 1 day before uterine flushing. At the same day, CL can be well characterized [38,39] and evaluated by ultrasound to determine ovarian superovulatory donor response. The first uterine horn to be flushed is the one ipsilateral to the ovary with better response.…”

Section: Initial Animal Handling and Preparationmentioning

confidence: 99%

Nonsurgical embryo recovery and transfer in sheep and goats

et al. 2016

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The embryo transfer techniques used in small ruminants worldwide are based in surgical procedures. These actions are performed under general anesthesia which needs a combination of animal fasting and drugs for secure animal handling and surgery manipulations. Therefore, it involves risks to animal health and life. The major limiting sequels are adhesions formed by the abdominal surgery, in the ovaries, uterus, or between them. These occurrences can both compromise uterus accessing and oocyte capture and are responsible for decreasing success and limiting successive embryo collections. In contrast, nonsurgical embryo procedures can be performed in a relatively simplified way. Nonsurgical embryo recovery does not need animal prolonged starvation, drug retention is minimized, and donors can stay in a standing position. After the end of embryo recovery, donors are promptly restored to their routine housing and feeding. Furthermore, this technique does not need incisions and, therefore, can be used repetitively in superovulated or nonsuperovulated goats and sheep for embryo recovery-a similar procedure done in cattle. In Brazil, promising results are reported using nonsurgical embryo transfer in recipient goats, and studies are currently evaluating similar procedures in sheep. Therefore, this review aimed to present the current panorama of nonsurgical embryo transfer in sheep and goats.

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Luteal dynamics in goats: morphological and endocrine features

Cited by 11 publications

References 29 publications

Histological Feature of Ovarian Structures Throughout the Reproductive Cycle in Alpine Goats (Capra Hircus)

Histological Feature of Ovarian Structures Throughout the Reproductive Cycle in Alpine Goats (Capra Hircus)

Colour Doppler Ultrasonography as a Tool to Assess Luteal Function in Santa Inês Ewes

Nonsurgical embryo recovery and transfer in sheep and goats

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