Total follicular populations in ewes of high and low ovulation rates

Cahill, L. P.; Mariana, J. C.; Mauléon, P.

doi:10.1530/jrf.0.0550027

Cited by 114 publications

(71 citation statements)

References 9 publications

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“…The low percentage of degenerated follicles observed in this study coincides with other studies [16,51]. The histological analysis of preantral follicles, in situ and isolated, showed that the degeneration is characterized by oocyte alterations while pycnotic bodies were not observed in granulosa cells.…”

Section: Discussionsupporting

confidence: 91%

“…Other studies, however, reported lower numbers of preantral follicles in goat [4] and sheep [20] ovaries. It is well-known that besides the species differences, preantral follicle populations may be affected by factors such as breed [16], age [18,21], hormone levels and reproductive stage [22], and nutrition [23].…”

Section: Discussionmentioning

confidence: 99%

“…The ovarian halves were serially sectioned at 7 pm. Every 120th section [16] was mounted and stained with periodic acid Schiff (PAS) and hematoxylin. The number of preantral follicles was estimated by counting the follicles in each section using the nucleus of the oocyte as a marker and the correction factor described by Gougeon and Chainy [17].…”

Section: Experiments 2: Qualitative and Quantitative Analysis O F The mentioning

confidence: 99%

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Zebu (Bos indicus) ovarian preantral follicles: morphological characterization and development of an efficient isolation method

et al. 2002

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Zebu (Bos indicus) ovarian preantral follicles: morphological characterization and development of an efficient isolation methodCarolina Madeira Lucci Rodolfo Rumpf José Ricardo Figueiredo Sonia Nair Béo AbstractPreantral follicles are a major source of oocytes, and their utilization as an important tool to store large number of female gametes for future use in reproductive programs has been investigated. The increasing importance of studies in this subject, together with the important role of Zebu cattle in the economy of tropical and subtropical countries as well as their well-known differences from European cattle, led to this research. The present study aims to determine the best size interval for sectioning ovarian tissue to isolate preantral follicles from Zebu cows using a tissue chopper and to evaluate the follicular quality after isolation. Furthermore, it aims to provide information about the Zebu cow preantral follicle population and use this data (as a control) to evaluate the effectiveness of the tested isolation method. Testing eight different tissue sectioning size intervals, it was possible to conclude that the 125-pm-section interval is shown to be better than the intervals of 25, 50, 175 and 200 pm to isolate preantral follicles from Zebu cow ovaries. The 125-pm interval allowed the recovery of 26,050±1611 (meaniS.E.M.) preantral follicles per one-half ovary, while the number of preantral follicles in situ estimated by evaluation of histological sections was 35,28812342 per one-half ovary. Thus, the mean (iS.E.M.) recovery rate (=[number of preantral follicles isolated/number of preantral follicles in situ in the same ovary] x 100) was 74.3±4.3%. The morphometrical analysis showed that Bos indicus preantral follicles are similar to B. taurus preantral follicles based on previous reports. In conclusion, this study showed that a simple, mechanical method can be used effectively to isolate a large number of intact preantral follicles from Zebu cow ovaries, with a high recovery rate.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Experiments 2: Qualitative and Quantitative Analysis O F The mentioning

confidence: 99%

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Zebu (Bos indicus) ovarian preantral follicles: morphological characterization and development of an efficient isolation method

et al. 2002

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“…Thus, continuous follicular growth occurs in the pony mare in average physical condition in the middle of the breeding season, and one hormonally priveleged period is evident towards the end of luteal phase, as in cows (Marion and Gier, 1971 ;Mariana and Nguyen Huy, 1973), ewes (Turnbull, Braden and Mattner, 1977 ;Cahill et al, 1979) and women (Gougeon, 1979). A similar conclusion was reached by Wesson and Ginther (1981) …”

mentioning

confidence: 73%

Effect of the stage of the oestrous cycle on the follicular population in pony mares

Driancourt¹,

Mariana²,

Palmer³

1982

Reprod. Nutr. Dévelop.

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Summary. In the middle of the breeding season, 16 pony mares (n = 4 per day) were slaughtered on four different days (days 6, 14, 17 and the preovulatory day) of the oestrous cycle, day 0 being the day of the last ovulation. All the ovaries were examined histologically ; the number, size and atresia (defined by granulosa cell pyknosis) of all follicles larger than 1 mm in diameter were studied, using a Kryotome-video recorder-TV system.Follicular distribution of all the sizes studied (1-5 mm, 5-10 mm, > 10 mm in diameter) was very similar in the right and left ovaries. However, compared to the other ovary, the ovary with a luteal structure had fewer (P < 0.05) healthy follicles larger than 10 mm. 'All follicles larger than 10 mm in diameter at day 6 were atretic. At day 14, a group of normal follicles larger than 10 mm was found in all the animals, and number of follicles larger than 10 mm was significantly increased (P < 0.011. The largest normal follicle has increased in size at day 17 compared to day 14. However, a significant increase in the number of follicles undergoing early atresia was observed (P < 0.05). Except for the large preovulatory follicle, all the follicles larger than 10 mm were atretic just before ovulation.There was a relationship between the follicular population and the duration of the follicular phase ; the number of normal follicles 1-10 mm in diameter and the duration of the follicular phase were highly correlated (R = -0. 56 ; P < 0.02).Introduction.

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“…Moreover, according to Ingram (1962) the atresia is a degenerative process of unknown duration. Cahill et al (1979) and Jorio et al (1991) have described that while the pycnosis of granulosa cells occurs in antral follicles, it is almost absent in preantral follicles.…”

Section: Discussionmentioning

confidence: 99%

Effect of Braun-Collins and Saline solutions at different temperatures and incubation times on the quality of goat preantral follicles preserved in situ

Carvalho

Lucci

Silva

et al. 2001

Animal Reproduction Science

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Total follicular populations in ewes of high and low ovulation rates

Cited by 114 publications

References 9 publications

Zebu (Bos indicus) ovarian preantral follicles: morphological characterization and development of an efficient isolation method

Zebu (Bos indicus) ovarian preantral follicles: morphological characterization and development of an efficient isolation method

Effect of the stage of the oestrous cycle on the follicular population in pony mares

Effect of Braun-Collins and Saline solutions at different temperatures and incubation times on the quality of goat preantral follicles preserved in situ

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