Intraovarianism and differences in ovulation frequency between left and right ovaries in Bos taurus heifers |
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| Affiliation: | 1. Eutheria Foundation, Cross Plains, WI, 53528, USA;2. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, 53706, USA;3. Departments of Animal Sciences and Dairy Science. University of Wisconsin-Madison, Madison, WI, 53706, USA;1. Department of Reproductive Center, First Affiliated Hospital ofGuangxi Medical University, Nanning, Guangxi, 530021, China;2. Department of Obstetrics and Gynecology, the Fourth Affiliated Hospital of Guangxi Medical University, Liuzhou, Guangxi, 545005, China;3. Reproductive Medicine Center, Liuzhou Maternal and Child Healthcare Hospital, Liuzhou, Guangxi, 545005, China;1. Shanghai JIAI Genetics & IVF Institute, Obstetrics & Gynecology Hospital of Fudan University, Shanghai 200011, China;2. Shanghai Key Laboratory for Female Reproductive Endocrine-Related Diseases, Institute of Reproductive and Development, Fudan University, Shanghai 200433, China;1. Department of Animal Reproduction and Veterinary Radiology, College of Veterinary Medicine and Animal Science, São Paulo State University, Botucatu, São Paulo, Brazil;2. Paranaense University, Department of Animal Reproduction, Umuarama, Paraná, Brazil;3. Santo Amaro University, Department of Animal Reproduction, São Paulo, São Paulo, Brazil;4. Laboratory of Animal Reproduction, Embrapa Genetic Resources and Biotechnology, Brasília, Distrito Federal, Brazil;1. Department of Animal Sciences, North Dakota State University, Dept 7630 PO Box 6050, Fargo, ND 58108-6050, USA;2. Department of Animal and Range Sciences, South Dakota State University, PO Box 2170, Brookings, SD 57007, USA;1. Istanbul University, Istanbul Faculty of Medicine, Department of Histology and Embryology, Istanbul 34093, Turkey;2. Istanbul University, Istanbul Faculty of Medicine, Department of Laboratory Animal, Aziz Sancar Institute of Experimental Medicine, Istanbul 34093, Istanbul, Turkey;3. Istanbul University, Istanbul Faculty of Medicine, Department of Neuroscience, Aziz Sancar Institute of Experimental Medicine, Istanbul 34093, Istanbul, Turkey;4. Istanbul University, Istanbul Faculty of Medicine, Department of Medical Pathology, Istanbul 34093, Turkey;5. Istanbul University, Istanbul Faculty of Medicine, Department of Forensic Medicine, Istanbul 34093, Turkey;6. Istanbul University, Istanbul Faculty of Medicine, Department of Physiology, Istanbul 34093, Turkey;1. Department of Clinical Embryology, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal 576 104, India;2. Department of Obstetrics and Gynecology, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal 576 104, India;3. Dipartimento di Biologia, Università di Napoli "Federico II", Complesso Universitario di Monte S Angelo, Napoli, Italy |
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| Abstract: | Sides of ovulation at beginning and end of an interovulatory interval (IOI) were studied for 10 successive ovulations in each of 100 heifers (1000 ovulations, 900 IOI). The frequency of side for 1000 ovulations was less (P < 0.0002) for the left ovary (LO or L; 44.4 %) than for the right ovary (RO or R; 55.6 %). Number of observed ratios of L to R was determined within each of 100 sets of 10 ovulations per set (eg, L2 to R8, L6 to R4). Expected ratios were calculated by combinatorics using the criterion that side of ovulation was an independent event. Differences in ratios between observed and expected were significant supporting the hypothesis that side of ovulation is dependent on the side of the previous ovulation. Number of pairs of ovulations for each end of the 900 IOI was significantly less for the LL pair (144, 16.0 %) than for the pairs of RR (255, 28.3 %), LR (247, 27.5 %), and RL (254, 28.2 %). The hypothesis was supported that the frequency of the pairs of ovulations at the beginning and end of an IOI differed among LL, RR, LR, and RL pairs. Novel observations were that frequency was lowest for the LL pair and similar among the the RR, LR, and RL pairs. These observations indicated that the greater frequency of RO ovulation was mathematically and functionally related to lower frequency of LO ovulation. The interpretation was that intraovarianism in the LL pair accounted for the lower frequency of LO than RO ovulation. |
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| Keywords: | Follicle selection Heifers Intraovarianism Side of ovulation Successive ovulations |
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