La sous-alimentation énergétique et/ou azotée chez la vache tarie. Effets sur les acides gras volatils du rumen, quelques métabolites et hormones du plasma et l'excrétion urinaire de la 3-méthylhistidine

Ndibualonji, BB; Dehareng, Dominique; Godeau, Jean-Marie

doi:10.1051/rnd:19950203

Cited by 6 publications

(3 citation statements)

References 17 publications

(18 reference statements)

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“…The catabolism rates of labile protein reserves might in turn increase, as evidenced by the significant increase in Ur MeHis and plasma MeHis, Asp, His, Ile, Met, and TAA. The above observations once again demonstrate that major changes in metabolite and hormone levels during the day in twice-daily fed cows are related to the nocturnal interprandial period (Hove and Blom, 1973;Mackenzie et al, 1988;Ndibualonji et al, 1995;Dehareng et al, 1996). Normoglycemia was maintained during the night despite a shortage in propionate, likely as a result of low Ins:GH ratio, which favors gluconeogenesis from AA (proteolysis) and glycerol (lipolysis; Ndibualonji and Godeau, 1993).…”

Section: Discussionmentioning

confidence: 84%

“…Theoretical requirements of the animals and the PDI supplies relative to each diet were estimated from alimentary tables (INRA, 1988). Feed, feces, and urine were analyzed with the following methods: DM (drying) and OM (ashing) according to the methods previously described by Ndibualonji et al (1995); total N with the Kjeldahl method; and gross energy with direct calorimetry (ballistic bomb-calorimeter). Insulin ( Ins) and GH were determined in 20-min pooled plasma samples (two plasma samples/ 20 min), whereas AA and glucose were measured in 1-h pooled samples (six samples/h).…”

Section: Methodsmentioning

confidence: 99%

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Continuous profiles and within-day variations of metabolites and hormones in cows fed diets varying in alimentary supplies before short-term feed deprivation.

Ndibualonji

Dehareng

Beckers

et al. 1997

Journal of Animal Science

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We investigated continuous profiles and within-day variations of some metabolites and hormones in four nonpregnant, nonlactating cows fed hay-based diets in two equal meals. Diets supplied either too much or too little N (approximately 1.3 or .8 times the maintenance requirements) and NE1 (approximately 1.2 or .8 times). Continuous collection of ruminal liquor, blood, and urine samples was performed for 42 consecutive hours, the last 16 h covering a period without feed. For twice-daily feeding, nitrogenous and energetic underfeeding decreased average ruminal propionate and the insulin:growth hormone ratio. However, only the energetic underfeeding increased plasma 3-methylhistidine and urinary excretion of 3-methylhistidine, and decreased body weight and ruminal acetate, butyrate, and total VFA. Conversely, only the nitrogenous underfeeding decreased glycemia. Whatever the dietary level, the 42-h patterns of metabolites and hormones were mainly affected by the time from the last meal. An energy deficit progressively took place during feed deprivation and the nocturnal interprandial period but not during the diurnal interprandial period. During the feed deprivation and nocturnal periods, glycemia was maintained despite a shortage in ruminal propionate. We conclude that in twice-daily fed cattle 1) the dietary supply of energy is the main trigger for an energy deficit and the subsequent muscle protein mobilization; 2) the nocturnal interprandial period may be considered as short-term feed deprivation; 3) the diurnal patterns of metabolites and hormones are not affected by the nitrogenous and(or) energetic supplies of the diet.

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Section: Discussionmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Continuous profiles and within-day variations of metabolites and hormones in cows fed diets varying in alimentary supplies before short-term feed deprivation.

Ndibualonji

Dehareng

Beckers

et al. 1997

Journal of Animal Science

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“…Cela peut s'expliquer par une réduction de la dégradation protéique dans les muscles, comme l'indiquent le bas niveau de la teneur plasmatique en MeHis enregistré à 9 h dans la présente étude chez la vache en lactation ainsi que la moindre quantité de MeHis excrétée dans les urines et le niveau élevé de l'insulinémie déterminés à ce moment de la journée chez la vache tarie alimentée aux mêmes heures (Ndibualonji, 1995 ;Ndibualonji et al, 1995 (Heitmann et Bergman, 1980 Enfin, la concentration la plus élevée en urée plasmatique a été observée à 9 h du matin, rejoignant en cela nos observations antérieures chez la vache tarie Dehareng et al, 1996) …”

Section: éVolutions Journalièresunclassified

Influence de la mise à jeun sur l'aminoacidémie libre, l'urémie et la glycémie chez la vache laitière

Ndibualonji¹,

Dehareng²,

Godeau³

1997

Ann. Zootech.

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protein mobilization, glycemia and milk yield dropped (P < 0.05) on the 2nd day of fasting. The fall in plasma glucose probably resulted from a continuous glucose uptake by the mammary gland for milk lactose synthesis which was not entirely compensated by gluconeogenesis. Within-day variations in plasma metabolites were observed, but these variations were generally lower during fasting than during feeding, especially for plasma glucose which showed variation with time of day during both fasting days. It was concluded that, as in dry cows, a 2-day fasting enhances muscle proteolysis in lactating cows. Contrary to dry cows, however, gluconeogenesis mechanism which attempts to maintain glucose homeostasis becomes insufficient in lactating cows to avoid a drop in glycemia from the 2nd day of fasting. The decrease in milk yield might be, at least partly, the result of that drop in glycemia. Finally, the time course from the last meal is a factor affecting within-day variations of plasma metabolites.

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The effects of breed and level of nutrition on whole-body and muscle protein metabolism in pure-bred Aberdeen Angus and Charolais beef steers

Lobley¹,

Sinclair

Grant³

et al. 2000

Br J Nutr

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Eighteen pure-bred steers (live weight 350 kg) from each of two breeds, Aberdeen Angus (AA) and Charolais (CH), were split into three equal groups (six animals each) and offered three planes of nutrition during a 20-week period. The same ration formulation was offered to all animals with amounts adjusted at 3-week intervals to give predicted average weight gains of either 1·0 kg/d (M/M group) or 1·4 kg/d (H/H group). The remaining group (M/H) were offered the same amount of ration as the M/M group until 10 weeks before slaughter when the ration was increased to H. Data on animal performance, carcass characteristics and fibre-type composition in skeletal muscle are presented elsewhere (; ). On three occasions (17, 10 and 2 weeks before slaughter) the animals were transferred to metabolism stalls for 1 week, during which total urine collection for quantification of Nτ-methylhistidine (Nτ-MeH) elimination was performed for 4 d. On the last day, animals were infused for 11 h with [2H5] phenylalanine with frequent blood sampling (to allow determination of whole-body phenylalanine flux) followed by biopsies from m. longissimus lumborum and m. vastus lateralis to determine the fractional synthesis rate of mixed muscle protein. For both breeds, the absolute amount of Nτ-MeH eliminated increased with animal age or weight (P < 0·001) and was significantly greater for CH steers, at all intake comparisons, than for AA (P < 0·001). Estimates of fractional muscle breakdown rate (FBR; calculated from Nτ-MeH elimination and based on skeletal muscle as a fixed fraction of live weight) showed an age (or weight) decline for M/M and H/H groups of both breeds (P < 0·001). FBR was greater for the H/H group (P = 0·044). The M/H group also showed a lower FBR for the first two measurement periods (both at M intake) but increased when intake was raised to H. When allowance was made for differences in lean content (calculated from fat scores and eye muscle area in carcasses at the end of period 3), there were significant differences in muscle FBR with intake (P = 0·012) but not between breed. Whole-body protein flux (WBPF; g/d) based on plasma phenylalanine kinetics increased with age or weight (P < 0·001) and was similar between breeds. The WBPF was lower for M/M compared with H/H (P < 0·001) based on either total or per kg live weight0·75. Muscle protein fractional synthesis rate (FSR) declined with age for both breeds and tended to be higher at H/H compared with M intakes (intake × period effects, P < 0·05). Changing intake from M to H caused a significant increase (P < 0·001) in FSR. The FSR values for AA were significantly greater than for CH at comparable ages (P = 0·044). Although FSR and FBR responded to nutrition, these changes in protein metabolism were not reflected in differences in meat eating quality (Sinclair et al. 2000).

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La sous-alimentation énergétique et/ou azotée chez la vache tarie. Effets sur les acides gras volatils du rumen, quelques métabolites et hormones du plasma et l'excrétion urinaire de la 3-méthylhistidine

Cited by 6 publications

References 17 publications

Continuous profiles and within-day variations of metabolites and hormones in cows fed diets varying in alimentary supplies before short-term feed deprivation.

Continuous profiles and within-day variations of metabolites and hormones in cows fed diets varying in alimentary supplies before short-term feed deprivation.

Influence de la mise à jeun sur l'aminoacidémie libre, l'urémie et la glycémie chez la vache laitière

The effects of breed and level of nutrition on whole-body and muscle protein metabolism in pure-bred Aberdeen Angus and Charolais beef steers

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