This study examined the suitability of sigmoidal (SIG) and exponential (EXP) functions for modeling HR kinetics at the onset of a 5-min low-intensity cycling ergometer exercise test (5MT). The effects of training status, absolute and relative workloads, and high versus low workloads on the accuracy and reliability of these functions were also examined. Untrained participants (UTabs; n = 13) per...

BACKGROUND The objective was to evaluate if cortisol concentrations are associated with the resumption of luteal activity in postpartum, primiparous cows exposed to bulls. The hypotheses were that 1) interval from start of exposure to resumption of luteal activity; 2) proportions of cows that resumed luteal function during the exposure period; and 3) cortisol concentrations do not differ among ...

We hypothesized that volatile fatty acids in rumen fluid are feedback signals that can condition food preferences or aversions in sheep. Three predictions were tested based on this hypothesis: 1) low doses of sodium propionate or sodium acetate condition preferences, but high doses condition aversions (Exp. 1 and 2); 2) preferences are not caused by osmotic load (Exp. 3 and 4); and 3) low doses...

For many years, 8-azaguanine (1) has received much attention because of its remarkable biological activity''. In 1961, this compound was found to be a metabolite of Streptomyces albus var. pathocidicus and named pathocidin2'. The same strain also produces a cytosine nucleoside antibiotic, blasticidin S. Because it is an example of an unusual nucleobase occurring in nature, we became interested ...

Crude glycerin is a co-product from biodiesel production. In 2006, approximately 250,000 million gallons of biodiesel were produced, which translates to 75,000 metric tons of glycerin. Glycerin contains approximately 3,650 kcal/kg of gross energy and, as such, it may be a potential dietary energy source for poultry. Three energy balance experiments were conducted to determine AMEn of glycerin u...

expansion equal channel angular extrusion (exp-ecae) is a severe plastic deformation (spd) operation for processing bulk materials. in the current study, aa7075 al was spd-processed by expansion equal channel angular extrusion (ex-ecae) at various temperatures and ram velocities. then, using split hopkinson pressure bar (shpb), the severely deformed products were compressed at room temperature ...

introduction: the mouse embryos can successfully be vitrified using ethylene glycol as cryoprotectant, however their development differs significantly from the non-vitrified embryos. the ability of their development can be improved when they co-culture with somatic cells. in the present study, the effects of co-culturing with vero cells on the development of vitrified two cell mouse embryos wer...

Three experiments were conducted to determine 1) the relationship between prolactin and growth hormone (GH) secretion in mares and the response to GH-releasing hormone (GHRH), 2) whether plasma GH and prolactin concentrations differed among mares, stallions, and geldings, and 3) whether sexual differences existed after administration of GHRH and acute exercise. In Exp. 1, 10-min blood samples w...