Lack of effect of short-term lupin grain feeding on ovulation rate in non-prolific Polish Mountain ewes during the breeding season: Ultrasonographic and endoscopic assessment of ovarian activity

Murawski, M.; Schwarz, T.; Erak, V.; Sohal, J.; Ahmadi, B.; Kridli, R. T.; Bartlewski, P. M.

doi:10.22092/ari.2020.351712.1530

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	Lack of effect of short-term lupin grain feeding on ovulation rate in non-prolific Polish Mountain ewes during the breeding season: Ultrasonographic and endoscopic assessment of ovarian activity
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نوع مقاله: Original Articles
شناسه دیجیتال (DOI): 10.22092/ari.2020.351712.1530
نویسندگان
M. Murawski¹؛ T. Schwarz²؛ V. Erak³؛ J. Sohal³؛ B. Ahmadi³؛ R. T. Kridli³^{، 4}؛ P. M. Bartlewski ³
¹Department of Nutrition, Animal Biotechnology and Fisheries, Faculty of Animal Science, University of Agriculture in Kraków, Cracow, Poland
²Department of Genetics, Animal Breeding and Ethology, Faculty of Animal Science, University of Agriculture in Kraków, Cracow, Poland
³Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
⁴Department of Animal Production, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan
چکیده
Specific changes in antral follicle numbers and wave-like pattern of development in cyclic ewes receiving high-protein, high-energy lupin grain for 6 days during the luteal phase of the estrous cycle (short-term nutritional flushing) remain unknown. The main objective of this experiment was to employ transrectal ovarian ultrasonography and videoendoscopy to determine ovarian effects of the 6-day lupin grain feeding in non-prolific Polish Mountain ewes. Estrus and ovulations were synchronized in 24 ewes with progestin-releasing intravaginal sponges inserted for 12 days during the middle portion of the breeding season (September-October; 50.0458° N, 19.8406° E). Eight ewes received the maintenance (hay-only) diet (Control), while the lupin-fed groups (each n=8) received 500 g of lupin grain once a day (Treatment 1) or 250 g of lupin grain twice a day (Treatment 2), from Days 9 to 14 of the synchronized cycle (Day 0=first ovulation of the interovulatory period studied). There were no differences (P>0.05) in the mean ovulation rate between the three groups of Polish Mountain ewes studied. Ovarian antral follicles emerging in the penultimate wave of the estrous cycle in Treatment 2 ewes had a longer (p <0.05) growth phase and attained a greater (p <0.05) diameter before ovulation in comparison to the other two groups of animals. A final wave of the interovulatory interval emerged 1 day earlier in Treatment 2 than in Treatment 1 ewes (p <0.05). Nutritional supplementation with lupin grain increased (p <0.05) the number of 3-mm follicles in Treatment 2 ewes. The present results indicate that short-term nutritional flushing with lupin grain from mid- to late luteal phase does not consistently enhance ovulatory responses in non-prolific genotypes of ewes. Even though the administration of lupins altered the timing of wave emergence, ovulatory follicle diameter or duration of different stages of follicular lifespan, it failed to increase the number of ovulatory follicles emerging in the penultimate and final waves of the estrous cycle in non-prolific Polish Mountain sheep.
کلیدواژه‌ها
sheep؛ ovulation rate؛ lupin grain؛ flushing؛ ultrasonography

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Lack of effect of short-term lupin grain feeding on ovulation rate in non-prolific Polish Mountain ewes during the breeding season: Ultrasonographic and endoscopic assessment of ovarian activity