Short term fasting as a tool to design effective grazing strategies for lactating dairy cattle: a review
P. Chilibroste A C , P. Soca A , D. A. Mattiauda A , O. Bentancur A and P. H. Robinson BA Department of Animal and Pasture Production, Agronomy Faculty, EEMAC, Ruta 3 km 363, CP 60000, Paysandú, Uruguay.
B Department of Animal Science, University of California, Davis, CA 95616-8521, USA.
C Corresponding author. Email: pchili@adinet.com.uy
Australian Journal of Experimental Agriculture 47(9) 1075-1084 https://doi.org/10.1071/EA06130
Submitted: 30 May 2006 Accepted: 4 May 2007 Published: 6 August 2007
Abstract
Varying the time since the last meal (i.e. fasting) is a means of manipulating foraging behaviour. Management practices that restrict grazing time, and/or change the timing of the grazing session, may be analogous to changes introduced with different fasting regimes, suggesting that the same pattern of responses on foraging behaviour could be expected. Concepts related to eating patterns of grazing dairy cows are briefly reviewed, and impacts of short-term (i.e. within day) fasts on ingestive behaviours are discussed. Finally, several experiments that examined impacts of short-term fasts on eating patterns, ingestive behaviours and performance of lactating dairy cows are reviewed. Management practices that create shorter grazing sessions (i.e. longer fasting periods before grazing), and/or involve afternoon grazing, result in longer initial grazing bouts, higher intake rates, reductions in rumination time during the grazing session, as well as more pronounced changes in rumen pH, concentrations of rumen fermentation metabolites and rumen load. All of these changes have been associated with improvements in performance of grazing dairy cattle. These concepts and findings have implications in defining optimal grazing strategies, as well as allowing cattle performance, sward conditions and nutrient balances to be predicted and analysed in an integrated manner.
Additional keywords: bite mass, bite rate, chewing, ingestion, pasture, rumen digesta loads, volatile fatty acids.
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