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Circulating concentrations of leptin, ovarian follicle number, and oocyte lipid content and active mitochondria, in Zebu crossbred cows maintained on standard or improved nutrition

Castaneda, C. A. and Kaye, P. and Pantaleon, M. and Phillips, N. and Fry, R. and D'Occhio, M. J. (2013) Circulating concentrations of leptin, ovarian follicle number, and oocyte lipid content and active mitochondria, in Zebu crossbred cows maintained on standard or improved nutrition. Animal Reproduction Science, 140 (1-2). pp. 7-13. ISSN 03784320

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Article Link(s): http://dx.doi.org/10.1016/j.anireprosci.2013.05.00...

Abstract

Zebu (Bos indicus) crossbred beef cows (Droughtmaster) were maintained long-term (16 months) on standard nutrition (SN) or improved nutrition (IN). Cows on IN had better body condition and greater (P<0.05) circulating concentrations of leptin than cows on SN (0.7±0.1n/ml and 1.7±0.1n/ml, respectively). There were no outstanding differences between SN and IN cows in basal number of ovarian follicles (≤4mm, 5-8mm, and≥9mm) and there were also no differences in number of oocytes recovered by oocyte pick-up. Cows on IN had a greater (P<0.05) number of total follicles after stimulation with FSH than cows on SN. Oocytes from cows on IN had greater (P<0.05) lipid content than cows on SN (-0.23±0.16 and 0.20±0.18 arbitrary units, respectively) and oocytes of the former cows also tended to have more active mitochondria, although this was not significant. Cows on IN showed a positive relationship (R2=0.31, P<0.05) between plasma leptin and oocyte lipid content. Lipids are utilized by oocytes during high energy consumptive processes including fertilization and early cleavage. The greater lipid content of oocytes from IN cows could therefore confer a reproductive advantage. The present study has shown relationships between nutrition, body condition, circulating leptin, and oocyte lipid content, but a clear cause-and-effect requires further investigation in the cow. © 2013 Elsevier B.V.

Item Type:Article
Business groups:Animal Science
Additional Information:Correspondence Address: D'Occhio, M.J.; School of Agriculture and Food Sciences, The University of Queensland, Gatton Campus, Gatton, QLD 4343, Australia; email: m.docchio@uq.edu.au
Keywords:Bovine Leptin Lipid Mitochondria Oocyte animal animal disease animal food article Australia blood cattle confocal microscopy diet female lipid metabolism metabolism mitochondrion ovary follicle physiology statistical model Animal Nutritional Physiological Phenomena Animals Linear Models Microscopy, Confocal Oocytes Ovarian Follicle Queensland Bos indicus Bovinae
Subjects:Science > Biology > Reproduction
Animal culture > Cattle
Animal culture > Feeds and feeding. Animal nutrition
Deposited On:03 Jul 2014 03:17
Last Modified:03 Jul 2014 03:17

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