Effect of the corpus luteum on ovarian follicular populations and growth in the ewe |
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| Institution: | 1. Department of Internal Medicine (Division of Dermatology and Venereology), Faculty of Medicine, University of Tabuk, Tabuk 71471, Saudi Arabia;2. Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Tabuk, Tabuk 71491, Saudi Arabia;3. Department of Clinical Biochemistry, Faculty of Pharmacy, University of Mansoura, Mansoura 35516, Egypt;1. Theriogenology Laboratory, Veterinary Gynaecology and Obstetrics, Southern Regional Station of ICAR- National Dairy Research Institute, Bengaluru, 560030, Karnataka, India;2. Reproductive Physiology Laboratory, ICAR - National Institute of Animal Nutrition and Physiology, Bengaluru, 560030, Karnataka, India;3. Dairy Production Section, Southern Regional Station of ICAR- National Dairy Research Institute, Bengaluru, 560030, Karnataka, India;1. Department of Radiation Oncology, Massachusetts General Hospital, Boston, Massachusetts, USA;2. Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts, USA;3. Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts, USA;4. Harvard Radiation Oncology Residency Program, Boston, Massachusetts, USA;5. Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA;6. Department of Neurosurgery, University of Oklahoma, Oklahoma City, Oklahoma, USA;7. Department of Neurosurgery, Brigham and Women''s Hospital, Boston, Massachusetts, USA;8. Department of Radiation Oncology, Dana-Farber Cancer Institute, Brigham and Women''s Hospital, Boston, Massachusetts, USA;1. Universidade Estadual do Ceará, Programa de Pós-Graduação em Ciências Veterinárias, Laboratório de Virologia, Fortaleza, CE, Brazil;2. Embrapa Ovinos e Caprinos, Sobral, CE, Brazil |
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| Abstract: | Four unilaterally and one bilaterally ovulating ewes with only one corpus luteum (CL) were used in experiment 1. All the animals were slaughtered at day 140 of pregnancy. The total number of preantral and antral follicles was determined in the CL ovary and non-CL ovary. In addition, the pattern of oocyte growth and granulosa cell development was investigated in both kinds of ovary.The CL ovary contained significantly more (P<0.01) preantral follicles than did the non-CL ovary (168.7 vs 93.7). No differences were found between the two kinds of ovary in the number of antral follicles nor in the diameter of the largest follicles. The CL have no effect on oocyte growth and cellular development of the granulosa.To provide further information on the intraovarian relationships between the CL and follicular development, outside all the endocrine factors related to pregnancy, preantral and antral follicles were counted in four unilaterally ovulating hysterectomized ewes (experiment 2) in which the CL persisted for 30 days (n=2) and 50 days (n=2). In any ewe, the CL ovary contained more preantral follicles than the non-CL ovary.All these data demonstrated that the presence of a CL on the ovary increases the preantral follicle populations. |
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