RELATIONSHIP BETWEEN FOLLICLE GROWTH AND CIRCULATING GONADOTROPHIN LEVELS DURING POSTNATAL DEVELOPMENT OF SHEEP

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MAHDI D.; KHALILI K.; DHIMI A.

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Journal: Cell Journal (Yakhteh) Year:2009 | Volume:11 | Issue:SUPPL. 1 Page(s): 25-26

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Title

RELATIONSHIP BETWEEN FOLLICLE GROWTH AND CIRCULATING GONADOTROPHIN LEVELS DURING POSTNATAL DEVELOPMENT OF SHEEP

Author(s)

MAHDI D. | KHALILI K. | DHIMI A.

Keywords

EWE LAMB

FSH

ANTRAL FOLLICLES

POSTNATAL DEVELOPMENT

OULED DJELLEL

Abstract

Objective: This study investigates the number and size of ovarian ANTRAL FOLLICLES in relation to plasma follicle stimulating hormones (FSH) and luteinizing hormone (LH) concentrations from birth to 26 weeks of age in EWE LAMBs of the OULED DJELLEL breed, a non-seasonal breed of sheep.Materials and Methods: Plasma was collected from 10 EWE LAMBs at 14 sampling times (Week 0, i.e. <24 h, Week 1 and every two weeks from Week 4 to Week 26, inclusive). At each of these stages, four EWE LAMBs were slaughtered, the ovaries recovered and weighed, and the number and size of the follicles determined from histological examination.Results: The pattern for plasma FSH showed a peak at Week 10, a smaller peak at Week 18 and a very small peak at Week 24. The pattern for LH was similar until Week 24 when the largest peak occurred. Paired ovarian weight increased rapidly from birth to four weeks and then more slowly to 10 weeks, followed by a decline at 12 weeks and a gradual increase from 14 to 24 weeks of age. The number and total diameter of follicles ³3 mm in diameter showed similar patterns of development - rising gradually from birth to week 14, falling to week 16 and then rising more rapidly to a peak at week 24. Maximum follicle diameter declined from birth to Week 1, then rose rapidly to Week 4, followed by a more gradual rise to week 14 and, thereafter, a more rapid increase to a peak of 7.23±0.16mm at 24 weeks old. The number of follicles (<3mm diameter) increased rapidly from birth to week 10 and then declined to values similar to those at weeks 1 and 4. First behavioural oestrus was observed at week 24 and a corpus luteum was present on the ovary of one lamb at Week 24 and two lambs at week 26.Conclusion: It was concluded that two or three peaks in plasma FSH and LH levels precede puberty and first and the increase in follicle numbers and size generally reflected the pattern of plasma FSH and LH levels.

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APA: Copy

MAHDI, D., KHALILI, K., & DHIMI, A.. (2009). RELATIONSHIP BETWEEN FOLLICLE GROWTH AND CIRCULATING GONADOTROPHIN LEVELS DURING POSTNATAL DEVELOPMENT OF SHEEP. CELL JOURNAL (YAKHTEH), 11(SUPPL. 1), 25-26. SID. https://sid.ir/paper/573305/en

Vancouver: Copy

MAHDI D., KHALILI K., DHIMI A.. RELATIONSHIP BETWEEN FOLLICLE GROWTH AND CIRCULATING GONADOTROPHIN LEVELS DURING POSTNATAL DEVELOPMENT OF SHEEP. CELL JOURNAL (YAKHTEH)[Internet]. 2009;11(SUPPL. 1):25-26. Available from: https://sid.ir/paper/573305/en

IEEE: Copy

D. MAHDI, K. KHALILI, and A. DHIMI, “RELATIONSHIP BETWEEN FOLLICLE GROWTH AND CIRCULATING GONADOTROPHIN LEVELS DURING POSTNATAL DEVELOPMENT OF SHEEP,” CELL JOURNAL (YAKHTEH), vol. 11, no. SUPPL. 1, pp. 25–26, 2009, [Online]. Available: https://sid.ir/paper/573305/en

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