In vivo and in vitro study of the function of the left and right bovine ovaries

Karamishabankareh, Hamed; Hajarian, Hadi; Shahsavari, M.H.; Moradinejad, Ruhollah

doi:10.1016/j.theriogenology.2015.04.033

Cited by 21 publications

(10 citation statements)

References 35 publications

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“…The present data showed that the right ovary was more active than the left ovary, and consequently, pregnancy was observed more frequently in the right horn than in the left horn. The cause for this ovarian asymmetry has also been reported in many species including cattle, sheep, goats and humans (Karamishabankareh, Hajarian, Shahsavari, & Moradinejad, 2015) According to the present data, CL had intraovarian positive effect on the number of medium and large follicles. Likewise, studies in cattle (Pierson & Ginther., 1987a) and sheep (Bartlewki, Beard, & Rawling, 2001;Dufour, Ginther, & Casida, 1971, 1972 number.…”

Section: Discussionsupporting

confidence: 80%

“…The present data showed that the right ovary was more active than the left ovary, and consequently, pregnancy was observed more frequently in the right horn than in the left horn. The cause for this ovarian asymmetry has also been reported in many species including cattle, sheep, goats and humans (Karamishabankareh, Hajarian, Shahsavari, & Moradinejad, 2015), but the rationale is not yet fully understood. Only during the last decade, few hypotheses have been proposed.…”

Section: Discussionmentioning

confidence: 96%

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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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Section: Discussionsupporting

confidence: 80%

“…The present data showed that the right ovary was more active than the left ovary, and consequently, pregnancy was observed more frequently in the right horn than in the left horn. The cause for this ovarian asymmetry has also been reported in many species including cattle, sheep, goats and humans (Karamishabankareh, Hajarian, Shahsavari, & Moradinejad, 2015), but the rationale is not yet fully understood. Only during the last decade, few hypotheses have been proposed.…”

Section: Discussionmentioning

confidence: 96%

Relationships among the corpus luteum, follicles and conceptus in sheep

Ali

Derar

2020

Anat Histol Embryol

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“…To our knowledge, little information is available about differences in ovary dominance when the ovary is exposed to exogenous hormones. More active CL were found on right ovaries in Holstein-Friesian dairy cows before administration of PGF 2α , and after its administration, 61% of CL were found in the right ovary (Karamishabankareh et al, 2015). Furthermore, in that study, no differences in the risks of estrus detection, pregnancy, or embryo survival were reported in 1,284 dairy cows when ovulation occurred from right or left ovaries.…”

Section: Discussionmentioning

confidence: 62%

Spatial relationships of ovarian follicles and luteal structures in dairy cows subjected to ovulation synchronization: Progesterone and risks for luteolysis, ovulation, and pregnancy

Stevenson

2019

Journal of Dairy Science

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Objectives were to determine relative ovary location of follicles, GnRH-induced corpora lutea (CL), and older CL present in ovaries as part of ovulation synchronization and their associations with progesterone concentration and risk for luteolysis, ovulation, and pregnancy. Cows were exposed to a timed artificial insemination (AI) program (1 dose or 2 doses 24 h apart)-56 h after first or only dose of PGF 2α -GnRH-2-16 h-timed AI at 72 ± 3 d in milk]. Blood was collected to assess progesterone when ovarian structures were mapped in 694 cows before GnRH-1 and before and 48 h after PGF 2α and, in a subset of cows, size of CL (n = 599) and progesterone (n = 380) at 6 d after AI. Dominant follicles and CL in singleovulating cows were detected more often in right than left ovaries (follicles before GnRH-1: 60.6% right and GnRH-2: 61.2% right; and CL before GnRH-1: 58.6% right and GnRH-2: 66.4% right). Dominant follicles in single-ovulating cows before GnRH-1 tended to be ipsilateral to the CL more often than contralateral (54.8 vs. 45.2%) with co-dominant follicles identified in both ovaries (19.3%). In response to GnRH-1 or GnRH-2, more left-ovary follicles ovulated contralateral to CL (left to right, 54.7%; right to left, 34.7%) than rightovary follicles, but fewer left-ovary follicles ovulated ipsilateral to CL (left to left: 45.3%) than right-ovary follicles ovulated ipsilateral (right to right: 65.3%). Preovulatory follicles in single-ovulating cows before PGF 2α tended to be detected more often ipsilateral than contralateral to CL induced by GnRH-1 (younger CL; 56.5 vs. 43.6%), but were of equal frequency ipsilateral or contralateral to older CL present before GnRH-1. Luteolytic risk was less in cows bearing co-dominant follicles in both ovaries compared with those in either right or left ovaries. Luteolytic risk in single-ovulating cows did not differ between ovaries. Luteolytic risk was greater for cows bearing older CL (86.5%) than for cows bearing younger GnRH-1-induced CL (65.3%) or both (79.6%). Pregnancy risk at 60 d after AI was or tended to be greater in cows having both CL types compared with either younger or older CL, respectively, partly because of greater embryonic loss in the latter 2 cases. More female calves tended to be carried in right horns when conception occurred after first service, whereas the opposite greater female frequency occurred in left horns after repeat services. Right-ovary dominance is evident before and after GnRH treatment.

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“…However, asymmetric activity differs according to the species, while in rats, the left ovary produces more oocytes (Domínguez et al., ), in humans (Fukuda, Fukuda, Andersen, & Byskov, ) and cattle (Gereš et al., ; Mello, Mrb, Abidu‐Figueiredo, Scherer, & Palhano, ), and the right ovary seems to ovulate more times than the left one. In cattle, also the oocytes produced by the right ovary seem to be of greater quality than those produced by the left ovary (Karamishabankareh & H. Hajarian, ). In rats, it has been demonstrated that the lateral differences are regulated by differences in right and left neural activity (Rosas et al., ; Sanchez & Dominguez, ).…”

Section: Introductionmentioning

confidence: 99%

Asymmetrical size and functionality of the pampas deer (Ozotoceros bezoarticus) testes: Right testis is bigger but left testis is more efficient in spermatogenesis

Ungerfeld

Villagrán

Lacuesta

et al. 2017

Anat Histol Embryol

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Information about gonadal asymmetries in ruminants is very scarce. In this work, we performed three complementary studies to compare characteristics of both testes: (i) weight and size of offspring and adult dead males; (ii) the tissue:fluid relationship determined by ultrasound scanning; and (iii) the spermatogenic status using fine needle aspiration cytology. The right testis was heavier than the left one in both offspring and adult animals and had greater width and volume in adult males than the left one. The ultrasound pixel intensity was similar in both testes. The right testis tended to have more spermatogonia (p = .06) and had a greater percentage of early spermatids (p = .004) than the left testis. On the other hand, the left testis had a greater percentage of spermatozoa (p = .05). The left testis had a greater spermatozoa/spermatogonia ratio (p = .02) and tended to have more spermatozoa/Sertoli cells ratio (p = .07). The spermatogenic index tended to be greater in the left than in the right testis (p = .06). Overall, we concluded that the right testis of pampas deer males is bigger but according to the cytology, it seems to be less spermatogenically effective than the left one, but these differences are not explained by different tissue:fluid ratio in each testis. Although differences were greater in adults than in offspring, asymmetry was observed even in just born offspring.

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In vivo and in vitro study of the function of the left and right bovine ovaries

Cited by 21 publications

References 35 publications

Relationships among the corpus luteum, follicles and conceptus in sheep

Relationships among the corpus luteum, follicles and conceptus in sheep

Spatial relationships of ovarian follicles and luteal structures in dairy cows subjected to ovulation synchronization: Progesterone and risks for luteolysis, ovulation, and pregnancy

Asymmetrical size and functionality of the pampas deer (Ozotoceros bezoarticus) testes: Right testis is bigger but left testis is more efficient in spermatogenesis

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