The relationship between carcass characteristics, plasma hormones and metabolites in young fattening bulls.

in Veterinary Research Communications (1990), 14(1), 19-26

Six Belgian Blue bulls (double-muscled type) and six Friesian bulls were offered a fattening diet for 34 weeks. Plasma samples were obtained once a week and also every 20 min over a 24 h period, 7 weeks ... [more ▼]

Six Belgian Blue bulls (double-muscled type) and six Friesian bulls were offered a fattening diet for 34 weeks. Plasma samples were obtained once a week and also every 20 min over a 24 h period, 7 weeks before slaughter. No differences were observed between the breeds in plasma glucose, urea and free amino nitrogen concentrations, while creatinine was significantly higher in the Belgian Blue bulls. Tri-iodothyronin, tetra-iodothyronin, insulin-like growth factor 1, insulin and testosterone concentrations were higher in the Holstein group. In contrast, the Belgian Blue bulls appeared to produce more growth hormone. The slaughter weight, carcass weight, dressing percentage and proportion of lean meat were significantly higher in the Belgian Blue group. The characteristics of muscle mass (carcass weight, dressing percentage and proportion of lean meat) were positively correlated with creatinine and with the total peak area or peak amplitude of growth hormone. The insulin concentration was positively correlated with the proportion of adipose tissue in the carcass and negatively correlated with the proportion of muscle. There were no correlations between the carcass characteristics and insulin-like growth factor 1 or testosterone. No further information was provided when the ratios of the hormones were correlated with carcass characteristics. [less ▲]

Effects of dietary carbohydrate composition on rumen fermentation, plasma hormone and metabolites in growing fattening bull

in Animal Production (1990), 50

A finishing diet containing barley and sugarbeet pulp 500:200 or 200:500 g/kg was given to 12 bulls twice daily at 08.00 and 16.00 h. The high-pulp diet increased rumen acetic and butyric acids and ... [more ▼]

A finishing diet containing barley and sugarbeet pulp 500:200 or 200:500 g/kg was given to 12 bulls twice daily at 08.00 and 16.00 h. The high-pulp diet increased rumen acetic and butyric acids and decreased propionic acid compared with the high-barley diet. The diurnal patterns over a 24-h period of rumen pH, volatile fatty acids, glucose and ammonia were characterized by 2 cycles. The high-pulp induced more even fermentations as indicated by flatter curves with less extreme values than those produced by high-barley diet. Ammonia concentration was high before feeding and decreased subsequently during 4 to 6 h after the meal. No typical patterns were observed in plasma concentrations of glucose and alpha-amino nitrogen. Plasma urea concentration increased 2 h after feeding and dropped during the following 6 to 8 h. There were no effects of dietary carbohydrate composition on growth hormone concentration but plasma insulin was significantly reduced with the high-pulp diet. Furthermore, the insulin profile showed peaks after each meal with the high-barley diet but only after the afternoon feeding with the high-pulp diet. [less ▲]

Effect of clenbuterol on animal performances, plasma hormones and metabolites in fattening cattle

in Proceedings of the 40th annual meeting of the EAAP (1989)

Effet du système de pâturage, des niveaux de complémentation et de fumure azotée sur la concentration en urée dans le lait et le sang de vaches laitières

in Annales de Médecine Vétérinaire (1989), 133

A note on the resting behaviour of cows before and after calving in two different housing systems

in Applied Animal Behaviour Science (1989), 23(1-2), 99-105

L'hormone de croissance en production de viande

in Annales de Médecine Vétérinaire (1989), 133

The somatotrope axis has been described in relation with the physiological effects associated with growth horone and somatomedins secretion. Animal productions were descried when growth hormone was ... [more ▼]

The somatotrope axis has been described in relation with the physiological effects associated with growth horone and somatomedins secretion. Animal productions were descried when growth hormone was administred to livestock. [less ▲]

Influence of supplemental lighting on the resting behaviour of fattening bulls kept in a stanchion barn

in Applied Animal Behaviour Science (1989), 22(3-4), 303-311

Resting behaviour of Friesian bulls maintained in a tie-stall barn under two patterns of lighting

in Applied Animal Behaviour Science (1988), 19(3-4), 321-329

Durée, fréquence et répartition des temps de repos de taurillons culards de race Blanc-Bleu-Belge en stabulation entravée

in Annales de Médecine Vétérinaire (1988), 132

Effect of trenbolone acetate associated with 17á-oestradiol on reproductive performances of young growing fattening bulls

in Journal of Animal Physiology & Animal Nutrition (1988), 59