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Environmental and Physical Stressors Influence Reproductive Function in Horses and Pigs
Başlık:
Environmental and Physical Stressors Influence Reproductive Function in Horses and Pigs
Yazar:
Guarin, Ana Maria Mesa, author.
ISBN:
9780438121720
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (128 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Özet:
Studies have examined numerous influences on reproductive function in a host of species. Exercise stress, postpartum health, oxidation, hyperthermia are all stressful conditions that alter homeostasis and can negatively affect reproduction. Both horses and pigs have shown to be adequate models for mammalian physiology studies. Due to their athletic nature horses are suitable as a model to study exercise, and porcine physiology is considered similar to that of humans. Therefore, experiments exploring exercise effect on both of these models may offer valuable features for translational studies. The purpose of this dissertation was to investigate either environmental or nutritional influences on reproductive function in both pigs and horses. In Experiment 1, cycling gilts were subjected to daily exercise to evaluate effects on reproductive physiology and gene expression in targeted tissues. However, exercised gilts had more medium (18.5 vs. 7.6; P < 0.05) and small (24.6 vs. 20.1; P < 0.01) sized follicles and more grade 2 oocyte complexes (14 vs. 58 P < 0.05). 20 out of 28 genes were differentially down regulated in oocytes aspirated from smaller follicles, with BMP15 and OOSP2 down regulated in granulosa cells from both small and medium follicles. AREG was under expressed in granulosa cells from medium follicles and ALDOA expression was unregulated in endometrium. These data indicated daily exercise influenced ovarian follicle development, gene expression and oocyte quality in cycling gilts. Experiment 2 intended to investigate the effect of incubating stallion spermatozoa in potential oxidative stressful conditions with the addition of H2O2 and/or incubated under hyperthermic conditions. Stallion spermatozoa were evaluated for DNA damage, membrane integrity and motility. In these experiments cells incubated with H2O2 showed decreased DNA damage (19.7% vs. 7.1% P < 0.05), but no other parameter seems to be affected. Experiment 3 evaluated postpartum parameters on mares supplemented with a nutraceutical, 0.5% L-arginine, through the last 90 days of gestation and uterine health as well as ovarian function was evaluated. Results demonstrated mares supplemented with 0.5% L-arginine had decreased uterine fluid accumulation. Supplementation during pregnancy with 0.5% L-arginine did not appear to influence offspring growth curb, as foals did not differ in weight, height, or cannon bone circumference during the first 9 weeks of life.
Notlar:
School code: 0070
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(696624.1) | 696624-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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