Application of a simulation method for the study of beginning growth in ovarian follicles

Mariana, J. C.; Meyer, Jan-Jakob

doi:10.1051/rnd:19790904

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…1, probably due to the smaller number of follicles considered per breed in this size range and, with 7 pm thick sections, the measurements of oocyte and follicular areas is less precise. This difference in the size of the follicle relative to the oocyte size between breeds has two possible explanations: (1) the process of oogénesis may differ between the two breeds, resulting in a basic structural difference of the small follicles between the breeds, or (2) since the largest follicles of the transitory category probably enter the growth phase (Mariana & Meyer, 1979), then what we are seeing in the adult animal is a partly depleted stock of small follicles because as the larger follicles move into the growth phase only the smaller follicles remain. The influence (if any) of this observed structural difference of the small follicles between breeds, on the recruitment of follicles to the growth phase remains unknown.…”

Section: Discussionmentioning

confidence: 99%

A study of the population of primordial and small follicles in the sheep

Cahill¹,

Mauléon²

1981

Reproduction

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The population of primordial and small follicles in adult ewes of high (3.1) and low (1.6) ovulation rate was studied by histological methods. The small follicle population which has a skewed frequency distribution in relation to either follicle or oocyte size can be divided according to morphological features into dormant, transitory and growth phases. It is suggested that initiation of follicle growth involves firstly the passage of follicles from the dormant to the transitory category and (if it occurs) is independent of gonadotrophins; and secondly, the passage from the transitory category to the growth phase. The second step is dependent on gonadotrophins and the rate of such passage is higher in ewes with a high ovulation rate. The overall mean follicle size of small follicles is larger in ewes with a low ovulation rate, suggesting that either they have structurally different small follicles or their reserve of small follicles is less depleted than in ewes with a high ovulation rate.

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Section: Discussionmentioning

confidence: 99%

A study of the population of primordial and small follicles in the sheep

Cahill¹,

Mauléon²

1981

Reproduction

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A Model with Three Compartments and Nonnegative Transfers

Berg

1991

Biometrical J

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SummaryWe consider a periodic model with three compartments, which can be considered as a simplified model for the dynamics of follicles. We give necessery and sufficient conditions for the solvability in nonnegative inputs, transfers and outputs, and we determine the minimal solution. If the problem ie not solvable according to measurement errors of the given data, we recover suitable values by the method of least-squares, solving a quadratic optimization problem.

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Embryo transfer bibliography IV

Seidel¹,

Seidel²

1980

Theriogenology

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Application of a simulation method for the study of beginning growth in ovarian follicles

Cited by 4 publications

References 7 publications

A study of the population of primordial and small follicles in the sheep

A study of the population of primordial and small follicles in the sheep

A Model with Three Compartments and Nonnegative Transfers

Embryo transfer bibliography IV

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