Ovarian Characteristics and Reproductive Performance of the Aged Cow1

Erickson, B. H.; Reynolds, R. A.; Murphree, R. L.

doi:10.1095/biolreprod15.4.555

Cited by 77 publications

(57 citation statements)

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“…Similar proportions were reported in histological studies in ovine (Driancourt et al, 1985) and bovine ovaries (Erickson, 1966b). Rodrigues et al (1998)and Amorim et al (unpublished results) also showed similar results in the isolation of caprine and ovine preantral follicles, respectively.…”

Section: Discussionsupporting

confidence: 77%

“…These data are in accordance with many other authors (Jewgenow and Göritz, 1995;Jewgenow and Stolte, 1996;Amorim et al, 1998;Rodrigues et al, 1998). A variety of factors has been described which may affect ovarian follicular populations, including age (Peters, 1976), breed (Cahill et al, 1979;Driancourt et al, 1985), reproductive stage (Erickson et al, 1976), nutrition (Scaramuzzi et al, 1993) and genetic factors (Erickson, 1966aErickson, 1966bCahill et al, 1979).…”

Section: Discussionmentioning

confidence: 99%

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Effect of the interval of serial sections of ovarian tissue in the tissue chopper on the number of isolated caprine preantral follicles

Lucci

Amorim

Báo

et al. 1999

Animal Reproduction Science

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The present work investigated the effect of the interval of serial sections of ovarian tissue on the number of isolated preantral follicles in the goat. Goat ovaries were cut in the tissue chopper at eight different intervals. The quality of isolated follicles were evaluated by histology and transmission electron microscopy. Best results were obtained when the ovaries were cut in the tissue chopper at intervals of 75.0 μm (9664 preantral follicles per ovary). Histochemical and ultrastructural analysis showed that the follicular morphology was preserved after mechanical isolation as demonstrated by the normality of oocytes and granulosa cells as well as by preservation of basement membrane. The percentages of isolated primordial, primary and secondary follicles were 96.3%, 2.5%, and 1.2% and their average diameters were 21.5, 34.7 and 65.3 μm, respectively. It was concluded that the interval of serial sections of ovarian tissue in the tissue chopper affects the number of isolated preantral follicles, and that the follicles remained intact after mechanical isolation in goats.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Effect of the interval of serial sections of ovarian tissue in the tissue chopper on the number of isolated caprine preantral follicles

Lucci

Amorim

Báo

et al. 1999

Animal Reproduction Science

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show abstract

“…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%

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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“…Ingram (1962) showed that factors such as age, reproductive cycle, pregnancy and lactation, hormones and nutrition may affect the follicular atresia rate. For bovine (Erickson et al, 1976) and ovine (Jorio et al, 1991) species, an increase in atretic preantral follicles with an increment in age was recorded. showed that the quality of bovine preantral follicles may be affected by the physiological state of the ovarian donor.…”

Section: Discussionmentioning

confidence: 99%