Evaluation of the relationship between some blood metabolites and elements on the ovarian persistent follicle formation in dairy cattle

Subject Areas : Veterinary Clinical Pathology

زهرا Merati ¹ , GH Moghaddam ² , S.A Rafat ^{3 *}

1 - Former M.Sc. Student, Department of Animal Sciences, Faculty of Agriculture, University of Tabriz, Tabriz
2 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz
3 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz

Received: 2011-04-19 Accepted : 2011-06-08 Published : 2011-02-20

Keywords: dairy cattle, estradiol, Elisa, Ovarian, Persistent follicle,

Abstract :

The object of this study was to investigate the effect of some blood metabolites and elements on the ovarian persistent follicle formation in dairy cattle. Blood samples were obtained from 117 lactating cows in two groups of normal and persistent follicle status. Glucose, urea, total protein, phosphorus and betahydroxy butyrate were measured by spectrophotometer method. Estradiol concentration in blood serum was measured by ELISA method. Effects of calving season, parity and milk production at 50-60 days postpartum were studied on persistent follicle status. Status of animal (presence or absence of resistant follicle) had significant effect on urea, protein, beta-hydroxybutyrate, phosphorus and estradiol (p<0.05). Logistic regression results indicated that if a cow were to increase her urea by one point, it is expected that the probability of resistant follicle formation increases by 0.548 units while the other variables in the model are held constant and if a cows phosphorus level increase one unit, it is expected that the probability of resistant follicle formation decreases by 1.06 units. Some metabolites and hormonal factors such as phosphorus and blood urea may play an important role in persistent ovarian follicle formation.

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