Feeding frequency for lactating cows: diurnal patterns of hormones and metabolites in peripheral blood in relation to milk-fat concentration

Sutton, John; Hart, I. C.; Morant, S. V.; Schuller, E; Simmonds, A. D.

doi:10.1079/bjn19880098

Cited by 91 publications

(87 citation statements)

References 9 publications

(16 reference statements)

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“…In contrast to our data, SUTTON et al 4) reported that more frequent feeding reduced plasma glucose levels in dairy cows. In addition, basal levels of plasma insulin were not changed, but glucagon levels were decreased by more frequent feeding conditions in their experiments.…”

Section: Discussioncontrasting

confidence: 55%

Effect of Feeding Frequency on Plasma Glucose, Insulin and Glucagon Concentrations in Sheep

Mineo¹,

Oyamada²,

Yasuda³

et al. 1990

Nihon Chikusan Gakkaiho

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The effects of feeding frequency on plasma glucose, insulin and glucagon levels were examined in four female sheep.Feed was given for one, two or three meals but the total amount (1500g of lucerne pellets and 300g of orchard grass hay) given a day was fixed. At the beginning of feeding, plasma glucose was decreased and both insulin and glucagon were increased in all meal patterns.When the frequency of feeding was increased, the changes of plasma glucose and pancreatic hormones were diminished at each feeding time.The mean values of plasma glucose and insulin concentration in a day were increased, whereas glucagon concentration decreased, and, as a result, the I/G ratio was decreased by more frequent feeding. In conclusion, changes of feeding frequency, when the same amounts of food a day are given, may affect not only the changes of plasma glucose and pancreatic hormones which immediately occur after feeding, but also the mean value of these nutrients and hormones in a day in sheep.Jpn. J. Zootech. Sci., 61(5): [411][412][413][414][415][416] 1990

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Section: Discussioncontrasting

confidence: 55%

Effect of Feeding Frequency on Plasma Glucose, Insulin and Glucagon Concentrations in Sheep

Mineo¹,

Oyamada²,

Yasuda³

et al. 1990

Nihon Chikusan Gakkaiho

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“…In studies with goats fed and milked at different times, the feeding of concentrates twice daily resulted in increased mammary blood¯ow, a response not seen when the concentrate portion of the ration was fed at intervals of 2 h (Bequette et al 1998). As pointed out by Bequette et al (1998), these temporal blood¯ow responses are similar to the changes in circulating hormones in dairy cows fed at similar intervals (Sutton et al 1988).…”

Section: Current Arterio-venous Difference Proceduressupporting

confidence: 59%

Perspectives on ruminant nutrition and metabolism. II. Metabolism in ruminant tissues

Annison

Bryden

1999

Nutr. Res. Rev.

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The discovery of the dominance of short-chain fatty acids as energy sources in the 1940s and 1950s, as discussed in part I of this review (Annison & Bryden, 1998) led to uncertainties concerning the interrelationships of glucose and acetate in ruminant metabolism. These were resolved in the following decade largely by use of 14 C-labelled substrates. Although only small amounts of glucose are absorbed in most dietary situations, glucose availability to ruminant tissues as measured by isotope dilution was shown to be substantial, indicating that gluconeogenesis is a major metabolic activity in both fed and fasted states. Studies with 14 C-labelled glucose and acetate revealed that in contrast to non-ruminants, acetate and not glucose is the major precursor of long-chain fatty acids in ruminant tissues. Interest in the measurement of energy metabolism in livestock grew rapidly from the 1950s. Most laboratories adopted indirect calorimetry and precise measurements of the energy expenditure of ruminants contributed to the development of new feeding systems. More recently, alternative approaches to the measurement of energy expenditure have included the use of NMR spectroscopy, isotope dilution and the application of the Fick principle to measure O 2 consumption in the whole animal and in de®ned tissues. The re®nement of the classical arterio-venous difference procedure in the study of mammary gland metabolism in the 1960s, particularly when combined with isotope dilution, encouraged the use of these methods to generate quantitative data on the metabolism of a range of de®ned tissues. The recent introduction of new methods for the continuous monitoring of both blood¯ow and blood O 2 content has greatly increased the precision and scope of arterio-venous difference measurements. The impact of data produced by these and other quantitative procedures on current knowledge of the metabolism of glucose, short-chain fatty acids and lipids, and on N metabolism, is outlined. The role of the portal-drained viscera and liver in N metabolism is discussed in relation to data obtained by the use of multi-catheterized animals. Protein turnover, and the impact of stress (physical, social and disease related) on protein metabolism have been reviewed. The growth of knowledge of mammary gland metabolism and milk synthesis since the ®rst quantitative studies in the 1960s has been charted. Recent ®ndings on the regulation of amino acid uptake and utilization by the mammary gland, and on the control of milk secretion, are of particular interest and importance.

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“…As taxas temporais de secreção de insulina provavelmente afetam o metabolismo, favorecendo o anabolismo nos tecidos (SUTTON et al, 1988).…”

Section: Tabela 4 -Valores Médios Das Concentrações Plasmáticas De Urunclassified

Influência do grão de sorgo como fonte de amido em ovinos alimentados com feno: parâmetros plasmáticos

López

Stumpf

2000

R. Bras. Zootec.

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O objetivo deste trabalho experimental foi verificar a influência de diferentes níveis de grão de sorgo, como fonte de amido, nos parâmetros plasmáticos em ovinos alimentados com feno de capim-elefante (Pennisetum purpureum Schum). O sorgo foi utilizado em quatro níveis na dieta: 0, 15, 30 e 45%. Foram usados 12 ovinos machos castrados distribuídos em quatro tratamentos com três repetições. Foram coletadas seis amostras de sangue por animal logo antes da refeição da manhã (hora zero) e 1, 2, 3, 4, 6 e 8 horas após. O delineamento experimental foi o completamente casualizado. A 1ª hora após a refeição apresentou a maior concentração plasmática de uréia (53,3 mg/100 mL) e foi superior à 6ª e 8ª hora (49,5 e 49,3 mg/100 mL). A maior concentração de uréia no plasma coincidiu com a maior concentração de amônia no líquido ruminal. O tratamento com 30% de sorgo na dieta apresentou concentração plasmática de glicose de 81,0 mg/100 mL e foi superior ao tratamento testemunha (60,4 mg/100 mL). A concentração de insulina variou entre tratamentos para cada hora de coleta após a refeição, de acordo com os níveis de sorgo na dieta. O tratamento com 45% de sorgo apresentou a maior concentração do hormônio no plasma. Observou-se para todos os tratamentos um pico de produção do hormônio na 4ª hora após a refeição.

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Feeding frequency for lactating cows: diurnal patterns of hormones and metabolites in peripheral blood in relation to milk-fat concentration

Cited by 91 publications

References 9 publications

Effect of Feeding Frequency on Plasma Glucose, Insulin and Glucagon Concentrations in Sheep

Effect of Feeding Frequency on Plasma Glucose, Insulin and Glucagon Concentrations in Sheep

Perspectives on ruminant nutrition and metabolism. II. Metabolism in ruminant tissues

Influência do grão de sorgo como fonte de amido em ovinos alimentados com feno: parâmetros plasmáticos

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