Insulin-like growth factor I during growth in bulls

Ronge, H.; Blum, J.W.

doi:10.1051/rnd:19890109

Cited by 30 publications

(37 citation statements)

References 13 publications

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“…In this study, serum IGF-I concentration and BW were closely correlated, as reported by Hornick et al (1998) and Blanco et al (2010b). However, the clear correlation between IGF-I concentrations and long-or short-term ADG observed in other studies was not evident here, as other authors had previously reported (Ronge and Blum, 1989;McKinnon et al, 1993). Therefore, IGF-1 could not be considered a good predictor of animal performance beyond the short term, as Blanco et al (2010b) had already observed, which would support their hypothesis that, under different nutritional managements, IGF-1 concentration is an immediate consequence of nutrition rather than an indicator of future performance.…”

Section: Discussionsupporting

confidence: 71%

Grazing lucerne as fattening management for young bulls: technical and economic performance and diet authentication

Alibés

Joy

Ripoll

et al. 2011

Animal

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Three fattening systems were evaluated from weaning to slaughter in order to find alternatives to grain feeding in young bulls, and to test the reliability of carcass subcutaneous fat colour to discriminate among them. After weaning (224 kg), one group of animals was fed concentrates and straw until they reached the target slaughter weight (450 kg; Feedlot), another group grazed rotationally on lucerne supplemented with 1.8 kg DM/day barley until slaughter (LUC), and the third group had the same management as LUC animals for 3 months (period 1) and thereafter was finished on concentrates and straw until slaughter (period 2; LUC + Feedlot). Animals were weighed weekly and sampled monthly for serum IGF-I and leptin, and plasma non-esterified fatty acids and carotenoid pigment concentration analyses. Carcass characteristics and subcutaneous fat colour were recorded after slaughter. In period 1, Feedlot animals had slightly greater weight gains than their grazing counterparts (P< 0.10), and at the end of period 1 they had 66% greater IGF-I and 35% greater leptin concentration (P< 0.01). Plasma carotenoid pigments were undetectable in Feedlot animals, but increased during grazing in LUC and LUC + Feedlot treatments. In period 2, weight gains were lowest for LUC, intermediate for Feedlot and greatest for LUC + Feedlot animals (P< 0.001), conditioning the time taken to reach slaughter weight (73, 58 and 47 days, respectively;P< 0.05). Leptin and IGF-I concentrations increased in all management systems during period 2. Plasma carotenoid pigment concentration reached its maximum at the end of period 2 in LUC animals, but it decreased sharply in LUC + Feedlot animals in this period. Management did not affect carcass traits except for subcutaneous fat colour. Yellowness, Chroma (C*) and the value of the integral of the translated reflectance spectrum (SUM), estimator of carotenoid pigment content in fat, were higher in LUC than in LUC + Feedlot and Feedlot animals (P< 0.001). Two logistic regressions were obtained to discriminate carcasses from LUC treatment: P (LUC) = (1 + e18.8–5.6 × lightness–36.9 × redness + 0.3 × SUM + 29.8 × C*)−1and LUC + Feedlot treatment: P (LUC + Feedlot)=(1 + e833.7–11.8 × lightness + 4.7 × redness + 0.2 × SUM−2.5 × C*)−1. The economic margin, calculated as income achieved minus costs, was greatest for LUC, intermediate for LUC + Feedlot and lowest for Feedlot treatment. Therefore, grazing lucerne supplemented with barley was an interesting alternative for fattening young bulls in these conditions, producing carcasses of similar quality, which could be accurately traced by measuring subcutaneous fat colour.

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Section: Discussionsupporting

confidence: 71%

Grazing lucerne as fattening management for young bulls: technical and economic performance and diet authentication

Alibés

Joy

Ripoll

et al. 2011

Animal

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“…Therefore, effects of glucocorticoids on IGF-I plasma concentrations are variable and may depend on treatment-dose (34) and age (9). In any case, plasma IGF-I concentrations increase during postnatal development in cattle (7,28,44). Therefore, elevated IGF-I concentrations in Dexa-treated calves, lower GH-to-IGF-I ratios in Dexa-treated calves, and the trend of lower GH-to-IGF-I ratios in colostrum-fed than in formula-fed calves indicate enhanced maturation of the somatotropic axis, as defined by Gluckman et al (19).…”

Section: Discussionmentioning

confidence: 99%

Effects of dexamethasone and colostrum intake on the somatotropic axis in neonatal calves

Sauter¹,

Ontsouka²,

Roffler³

et al. 2003

American Journal of Physiology-Endocrinology and Metabolism

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Glucocorticoids and colostrum feeding influence postnatal maturation of the somatotropic axis. We have tested the hypothesis that dexamethasone (Dexa) affects the somatotropic axis in neonatal calves dependent on colostrum intake. Calves were fed either with colostrum or with a milk-based formula ( n = 14/group), and, in each feeding group, one-half of the calves were treated with Dexa (30 μg · kg body wt-1 · day-1). Pre- and postprandial blood samples were taken on days 1, 2, 4, and 5, and liver samples were taken on day 5 of life. Dexa increased insulin-like growth factor (IGF)-I, but decreased growth hormone (GH) and IGF-binding protein (IGFBP)-1 and -2 plasma concentrations and increased GH receptor (GHR) mRNA levels in liver. Dexa increased IGF-I mRNA levels only in formula-fed calves and increased hepatic GHR binding capacity, but only in colostrum-fed calves. Colostrum feeding decreased IGFBP-1 and -2 plasma concentrations and hepatic IGFBP-2 and -3 mRNA levels. In conclusion, Dexa and colostrum feeding promoted maturation of the somatotropic axis. Dexa effects partly depended on whether colostrum was fed or not.

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“…During the fattening period, the ADG was 1.32 kg/d in 4 CG while in the compensating groups, values reached respectively 1.53, 1.43, and 1.53 kg/d. 5 Only G2 showed a higher ADG during the fattening period than CG (P < .05).…”

mentioning

confidence: 87%

“…The most significant 1 differences appeared in period III: pulse amplitude as well as pulse surface, nadir and overall 2 mean decreased when compared to period II whereas between period I and II, no differences 3 were observed for these parameters. 4 The GH profile during the low growth period in G2 was characterized by many, close 5 and large pulses with high amplitude and a high nadir, resulting in a higher mean 6 concentration than in periods II and III (P < .05). The number, amplitude and area of the 7 pulses, as well as nadir, were numerically higher during period II than during period III, and 8 mean concentration was higher (P < .01).…”

mentioning

confidence: 87%

“…In G2, page-5-G3, and G4, corresponding measurements were obtained on the middle of the low growth 1 period, 1 mo after the end of the transition period and 1 mo before slaughter. 2 The Autoanalyser Technicon was used for determination of glucose by o-toluidine 3 method (Henry et al, 1974a), urea by diacetylmonoxime method (Henry et al, 1974b) and 4 AAN by trinitrophenyl derivatisation (Palmer and Peters, 1969). NEFA were determined by 5 fused silica capillary GC (Müller and Binz, 1982).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Different periods of feed restriction before compensatory growth in Belgian Blue bulls: II. Plasma metabolites and hormones.

Hornick

Eenaeme

Diez

et al. 1998

Journal of Animal Science

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Insulin-like growth factor I during growth in bulls

Cited by 30 publications

References 13 publications

Grazing lucerne as fattening management for young bulls: technical and economic performance and diet authentication

Grazing lucerne as fattening management for young bulls: technical and economic performance and diet authentication

Effects of dexamethasone and colostrum intake on the somatotropic axis in neonatal calves

Different periods of feed restriction before compensatory growth in Belgian Blue bulls: II. Plasma metabolites and hormones.

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