| 1. |
- Sliwa, E, et al.
(författare)
-
Influence of dexamethasone and alpha-ketoglutarate administration to pregnant sows on the level of some hormones in the blood plasma of newborn un-suckled piglets
- 2005
-
Ingår i: Medycyna Weterynaryjna. - 0025-8628. ; 61:12, s. 1405-1407
-
Tidskriftsartikel (refereegranskat)abstract
- The aim of the study was to establish the influence of dexamethasone and alpha-ketoglutarate administration to pregnant sows on the prenatal programming of the growth hormone level, cortisol, insulin and IGF-I in the blood serum of newborn piglets assessed just after their birth and prior to suckling. The foetal development is dependent on and determined by hormones such as glucocorticoids as well as nutrient supply through the sow, especially from the digestive tract. All these factors determine pre- and neonatal growth. The experiment was conducted over the final 24 days of pregnancy in sows treated i.m. with dexamethasone at a dose of 3 mg per sow every second day or alpha-ketoglutarate administered orally daily at a dose of 0.4 g/kg b.w. The blood samples were collected from the subclavian vein of un-suckled piglets immediately following their birth and were centrifuged straight away and the serum stored at -25 degrees C until further analysis. Hormone concentrations were determined using ELISA kit. The obtained results indicate that maternal administration of dexamethasone increased the level of cortisol while alpha-ketoglutarate increased the levels of cortisol and IGF I whereas simultaneous administration of dexamethasone and AKG significantly increased the growth hormone. These results of separate or simultaneous maternal administration of dexamethasone and alpha-ketogluta rate during the last 24 days of pregnancy indicated the activation of different mechanisms and different prenatal effects on the levels of cortisol, growth hormone and IGF I in serum assessed immediately following the birth of the piglets.
|
|
| 2. |
- Sliwa, E, et al.
(författare)
-
Influence of dexamethasone and alpha-ketoglutarate on growth and development of the skeletal system of pigs
- 2005
-
Ingår i: Medycyna Weterynaryjna. - 0025-8628. ; 61:5, s. 526-531
-
Tidskriftsartikel (refereegranskat)abstract
- The aim of the study was to establish the influence of dexamethasone and/or alpha-ketoglutarate (AKG) on the growth, mineralization, geometric and mechanical properties of ribs as a methodological model. The experiment was conducted during the final 24 days of prenatal life and first 14 days of neonatal life. The volumetric bone density of the trabecular and cortical bone was determined separately using the quantitative computed tomography (QCT) method and Somatom AR. T - Siemens apparatus. The mechanical properties were determined using the three-point bending test according to the method by Ferretti et al. The obtained results indicate that maternal administration of dexamethasone increased volumetric mineral density, although the mechanical parameters had lower values. Prenatal administration of AKG decreased all the geometric and mechanical parameters of the investigated ribs. The results obtained during the administration of the compound in neonatal life were the opposite of the prenatal results. Dexamethasone and AKG given together had the same influence on mineralization and other properties AND increasing their values during prenatal and neonatal life. This model of administrating dexamethasone and AKG maternally during prenatal life with the intention of provoking structural growth of the skeleton may be useful in further elucidating some biological and pharmacological factors on bone formation in prenatal life.
|
|
