Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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The IsoButanol Rotterdam Platform Project
Dijkstra, J.W.H. ; Straathof, A.J.J. ; Lopez Contreras, A.M. ; Zirkzee, H. ; Wermink, W. ; Ramirez-Ramirez, A. ; Hal, J.W. van - \ 2016
Dietary self-selection by broilers at normal and high temperature changes feed intake behavior, nutrient intake, and performance
Syafwan, W. ; Wermink, G.J.D. ; Kwakkel, R.P. ; Verstegen, M.W.A. - \ 2012
Poultry Science 91 (2012)3. - ISSN 0032-5791 - p. 537 - 549.
high ambient-temperature - sensible heat-loss - environmental-temperature - water-consumption - electrolyte balance - growth-performance - male turkeys - body-weight - protein - chickens
Self-selection assumes that at high ambient temperature, birds are able to select a diet from different sources to minimize the heat load associated with the ingested nutrient metabolism. The objective was to test the hypothesis that young chickens are able to compose an adequate ration by adjusting dietary nutrient intake from 3 different diets that vary in energy and in protein contents from a cafeteria system at high temperature (HT; 31–32°C) and at normal temperature (NT; 31–21°C). Night temperature was set at 25°C at HT and at 18°C at NT and 12 h dark:12 h light. Control birds were fed a standard control diet (CP: 215 g/kg; ME: 2,895 kcal/kg) for broiler chickens. The choice-fed birds could choose between the control diet, a high-protein diet (CP: 299 g/kg; ME: 2,780 kcal/kg), and a high-energy diet (CP: 150.7 g/kg; ME: 3,241 kcal/kg). The diets had similar pellet size and color. Birds had access to each diet in a separate feeding trough from 1 to 42 d of age. Results showed that broilers spent 3.3% more time eating at NT than at HT and showed 42% more panting behavior at HT than at NT. High temperature decreased feed intake, protein intake, energy intake, and BW gain. Choice-fed birds had similar feed intake and BW gain, 14% lower protein intake, and 6.4% higher energy intake than control-fed birds. Body temperature and heterophil/lymphocyte ratio were higher at HT than at NT. Water intake was 8% higher in control-fed birds than in choice-fed birds but similar at both temperature regimens. It can be concluded that broilers can compose a diet by selecting less protein but higher energy density from different diets compared with the control. Choice-fed birds had similar feed efficiency as control-fed birds at HT, indicating similar body composition for both groups. Extra energy intake of choice-fed birds at HT was used for panting activity.
Effects of diet self selection on nutrient intake and performance in broiler chickens reared under normal and high temperatures
Syafwan, W. ; Wermink, D. ; Kwakkel, R.P. ; Verstegen, M.W.A. - \ 2008
In: Book of abstracts of the XXIII World's Poultry Congress, Brisbane, Australia, June 30 - July 4, 2008. - WPSA - p. 300 - 300.
Reduction of dietary crude protein level has been recommended for broilers under heat stress conditions, but low-protein diets have shown negative effects on performance. On the other hand, high energy levels were suggested in order to dissipate the heat load during panting. In this study it was investigated if birds would adjust their nutrient intake if they were raised in a high temperature (HT) environment (31-32°C) as compared to a normal temperature (NT) environment (21°C). It was found that feed intake, crude protein (CP) intake, energy intake and body weight gain (BWG) were lower under the HT regime. CP intake was lower in choice group whereas energy intake was higher. FCR of broilers in the HT was lower than in the NT up to 35 d of age. Water consumption was more related to feed intake rather than related to temperature.
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