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    Schmidely, P. Lloret-Pujol, M. Bas, P. Rouzeau, A. and Sauvant, D. 1999. Influence of Feed Intake and Source of Dietary Carbohydrate on the Metabolic Response to Propionate and Glucose Challenges in Lactating Goats. Journal of Dairy Science, Vol. 82, Issue. 4, p. 738.
    Graml, R. Olbrich-Bludau, A. Schwab, M. Schallenberger, E. Schams, D. and Pirchner, F. 1995. Relationship between plasma hormone and metabolite levels and breeding values of bulls1. Journal of Animal Breeding and Genetics, Vol. 112, Issue. 1-6, p. 313.
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Physiological attributes as possible selection criteria for milk production 3. Plasma hormone concentrations and metabolite and hormonal responses to changes in energy equilibrium

  • R. B. Land (a1), W. R. Carr (a1), I. C. Hart (a1) (a2), T. J. Osmond (a1), R. Thompson (a1) (a3) and N. Tilikaratne (a1)...
Abstract

Plasma hormone concentrations and metabolite responses to changes in energy equilibrium were measured in experiments designed to compare a) Hereford × Friesian with Friesian calves and b) Friesian calves sired by bulls with a high level of Improved Contemporary Comparison with those sired by bulls of a low level. The concentration of thyroxine and triiodothyronine tended to be greater in calves of higher dairy merit. The concentration of growth hormone was largely unrelated to dairy merit in the circumstances studied. The concentration of insulin was greater in Hereford × Friesian than in Friesian calves following feeding and following the injection of propionate. Responses to the injection of insulin and of growth hormone (as measured by changes in the plasma concentration of urea nitrogen, free fatty acids, glucose or the other hormone) were little affected by the level of Improved Contemporary Comparison of a calfs sire.

It was concluded that the thyroid system and the response of insulin to perturbation of energy balance may provide criteria of genetic merit for milk production which are neither age- nor sex-limited.

Copyright
COPYRIGHT: © British Society of Animal Science 1983
References
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Hart, I. C., Bines, J. A., Balch, C. C. and Cowie, A. T. 1975a. Hormone and metabolite differences between lactating beef and dairy cattle. Life Sci. 16: 1285–1292.
Hart, I. C., Bines, J. A., Morant, S. V. and Ridley, J. L. 1978. Endocrine control of energy metabolism in the cow: comparison of the levels of hormones (prolactin, growth hormone, insulin and thyroxine) and metabolites in the plasma of high- and low-yielding cattle at various stages of lactation. J. Endocr. 77: 333–345.
Hart, I. C., Flux, D. S., Andrews, P. and Mcneilly, A. S. 1975b. Radioimmunoassay for ovine and caprine growth hormone: its application to the measurement of basal circulating levels of growth hormone in the goat. Hormone Metab. Res. 7: 35–40.
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Osmond, T. J., Carr, W. R., Hinks, C. J. M., Land, R. B. and Hill, W. G. 1981. Physiological attributes as possible selection criteria for milk production. 2. Plasma insulin, tri-iodothyronine and thyroxine in bulls. Anim. Prod. 32: 159–163.
Patterson, D. S. P. 1963. Some observations on the estimation of non-esterified fatty acid concentrations in cow and sheep plasma. Res. vet. Sci. 4: 230–237.
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Seth, J., Toft, A. D. and Irvine, W. J. 1976. Simple solid phase radioimmunoassays for total triiodothyronine and thyroxine in serum and their clinical evaluation. Clinica chim. Ada. 68: 291–301.
Tilikaratne, N., Alliston, J. C., Carr, W. R., Land, R. B. and Osmond, T. J. 1980. Physiological attributes as possible selection criteria for milk production. 1. Study of metabolites in Friesian calves of high and low genetic merit. Anim. Prod. 30: 327–340.
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