التفاصيل البيبلوغرافية
| العنوان: |
Effect of melatonin on follicular development parameters in a fixed-timed artificial insemination programme in water buffalo. |
| العنوان البديل: |
Učinak melatonina na parametre razvoja folikula u programu umjetnog osjemenjivanja bizona u točno određenom vremenu. (Croatian) |
| المؤلفون: |
Berdugo, J. A., Konrad, J. L., Yuponi, R., Bandeo, A., Camelino, R., Cardona-Maya, W. D., Crudeli, G. A. |
| المصدر: |
Veterinarska Stanica; 2021, Vol. 52 Issue 6, p651-658, 8p |
| مصطلحات موضوعية: |
ARTIFICIAL insemination, WATER buffalo, MELATONIN, ANESTRUS, FREE radical scavengers, MAMMAL adaptation |
| الملخص (بالإنجليزية): |
It is well known that buffaloes have seasonal anoestrus and that the use of melatonin reduces the effects of season in reproduction, particularly among sheep and goats. This study evaluates the use of melatonin on water buffaloes to increase pregnancy rates in a fixed-time insemination programme. The study was conducted on an Argentinian buffalo herd, located in the Corrientes Province, during an unfavourable reproductive season. Artificial insemination cycles were performed in September and December 2018. Sixty animals were selected, and melatonin was administered to 29 females at a dose of 18 mg/50 kg. Ten days after the melatonin implant, ovulation synchronization was started. Animals were inseminated with frozen semen of a single bull. Pregnancy was evaluated by ultrasound 35 days after insemination. The pregnancy rate of the two repetitions was 34.62% for September and 6.4% for December (P=0.007). No significant differences were found in the parameters associated with follicular development and formation of the corpus luteum. Analysis of the effects of melatonin on the two replicates showed that there was no statistically significant effect of ovarian response regarding the analysed follicular development parameters. There was also no effect on pregnancy rates (17.85% vs. 20.68%; P=0.15), or on follicular development for treatment and control. In conclusion, this study was not able to demonstrate an effect of melatonin on the ovarian response of buffaloes as reported by other authors. Other factors, such as environmental conditions of subtropical areas and species specificities, may have a more significant effect on buffalo endocrinology. These factors should be evaluated to improve the results of fixedtimed artificial insemination programmes. [ABSTRACT FROM AUTHOR] |
| Abstract (Croatian): |
Dobro je poznat sezonski anestrus u bizona, kao i da je uporaba melatonina pokazala smanjenje učinaka sezone na reprodukciju, posebice u ovaca i koza. Cilj je ovog rada bio procijeniti uporabu melatonina u vodenih bizona za povećanje postotka gravidnosti u programima umjetnog osjemenjivanja u točno određenom vremenu. Ovaj rad je proveden na stadu argentinskih bizona koji se nalaze u provinciji Corrientes tijekom nepovoljne reproduktivne sezone; u rujnu i prosincu 2018. godine obavljeni su ciklusi umjetnog osjemenjivanja, a 29 u ženki implantiran je melatonin u dozi od 18 mg/50 kg. Deset dana nakon implantacije melatonina, započeta je sinkronizacija ovulacije. Životinje su osjemenjene smrznutim sjemenom jednog bika. Gravidnost je dijagnosticirana ultrazvukom 35 dana nakon osjemenjivanja. Postotak gravidnosti dva ponavljanja bila je 34,62 % te 6,4 % (P=0,007), u rujnu, odnosno prosincu. Nije otkrivena značajna razlika u parametrima povezanima s razvojem folikula i formiranjem corpus luteum. Analiza rezultata o učinku melatonina tijekom dva ponavljanja pokazala je da nema statistički značajnog učinka odgovora jajnika na analizirane parametre razvoja folikula. Isto tako, nije bilo učinka na postotke gravidnosti, 17,85 % u usporedbi s 20,68 % (P=0,15) te na razvoj folikula u pokusnoj, odnosno kontrolnoj skupini. Zaključno, u uvjetima ove studije nije bilo moguće dokazati učinak melatonina na odgovor jajnika u bizona o kakvom su izvijestili drugi autori. Pretpostavljamo da drugi čimbenici, poput uvjeta okoliša u suptropskim područjima te posebnosti vrste, imaju značajniji učinak na endokrinologiju bizona. Potrebno je procijeniti točno određeno vrijeme da bi poboljšali rezultate programa umjetnog osjemenjivanja. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
