Metabolic rate and its relationship with ascites in chicken genotypes

D.D. Malan, C.W. Scheele, J. Buyse, C. Kwakernaak, F.K. Siebrits, J.D. van der Klis, E. Decuypere

Research output: Contribution to journalArticleAcademicpeer-review

28 Citations (Scopus)


This review addresses the suggestion that the decline in dairy reproductive performance, as increasingly observed these days, may be due to a hampered process of metabolic adaptation in early lactating cows. In our opinion, adaptation to the negative energy balance is a gradual process. Because almost all cows do adapt in the long run, it is not possible to classify animals as adapted or non-adapted. The use of risk factors is more appropriate in this case and is discussed in this review. Among them are the body condition score and its derivatives, feed intake, the calculated negative energy balance, and metabolic parameters like the plasma concentration of insulin or the triacylglycerol content in the liver. Moreover, factors that play a role in the link between declined reproductive performance and the metabolic situation of the cow during the early lactating period are discussed. Among these are insulin, insulin-like growth factors, leptin, neuropeptide Y, non-esterified fatty acids, thyroid hormones, urea, and ammonia.
Original languageEnglish
Pages (from-to)309-315
JournalBritish Poultry Science
Issue number2
Publication statusPublished - 2003


  • broiler chicken
  • physiological variables
  • ambient-temperature
  • growth
  • susceptibility
  • hemodynamics
  • performance
  • occlusion


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