150 research outputs found
Instrumentele Analysemethoden. Part IA. Spectrometrische en aanverwante analysemethoden. Algemene theorie en instrumentatie
Instrumentele Analysemethoden.Part 1B. Spectrometrische en aanverwante analysemethoden. Technieken
Different periods of feed restriction before compensatory growth in Belgian Blue bulls: II. Plasma metabolites and hormones
Plasma metabolites and hormones were studied in 16 double-muscled Belgian Blue bulls maintained at low growth (.5 kg/d) for 114 (G2), 243 (G3), or 419 (G4) d (low growth period, LGP) before fattening (rapid growth period, RGP). Animals from the control group (CG) were fed a diet high in energy and protein. The animals from G2, G3, and G4 were fed a restricted amount of a diet low in energy and protein during LGP and the same diet as CG during RGP. Plasma glucose, alpha-amino nitrogen (AAN), NEFA, urea, creatinine, thyroxine (T4), 3,3',5'-triiodothyronine (T3), and IGF-I were measured in blood samples taken fortnightly. Plasma GH and insulin (I) profiles were measured in serial blood samples obtained at three times during growth. The RGP was characterized by an initial compensatory growth, by higher plasma glucose, AAN, and urea levels, and by lower plasma NEFA and creatinine levels. Plasma GH concentration decreased after refeeding. Plasma T4 increased linearly during refeeding, as opposed to T3, which showed a different profile in each group. Plasma IGF-I showed a curvilinear increase during RGP and reached a plateau after 3 mo in each compensating group. In G4, changes of plasma metabolites and hormones differed often distinctly from G2 or G3. During refeeding, higher nutrient supply improved the functionality of the somatotropic axis and increased the concentration of anabolic hormones, allowing rapid muscle deposition. However, animals underfed the longest period behaved differently from the other groups, possibly because they reached a more complete sexual maturity
Different periods of feed restriction before compensatory growth in Belgian Blue bulls: I. Animal performance, nitrogen balance, meat characteristics and fat composition
Effects on performance and meat characteristics of a diet supplemented with fat during the finishing period of growing fattening bulls
peer reviewe
La détermination quantitative des acides gras volatils dans le liquide du rumen par chromatographie en phase gazeuse
Studies on ghosting, an important source of error in the quantitative estimation of free volatile fatty acids by GLC. 2. Effect of sample VFA concentration on ghosting magnitude and effectiveness of remedies to limit ghosting
peer reviewe
Studies on ghosting, an important source of error in the quantitative estimation of free volatile fatty acids by GLC. 1. Occurence of ghosting and factors influencing it
- …