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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Record number 455531
Title Effects of ambient temperature, plumage condition, and housing system on energy partitioning and performance in laying hens
Author(s) Krimpen, M.M. van; Binnendijk, G.P.; Anker, I. van den; Heetkamp, M.J.W.; Kwakkel, R.P.; Brand, H. van den
Source In: Book of Abstracts of the World's Poultry Congress. - - p. 1107 - 1112.
Event WPC2012, Salvador, Bahia, Brasil, 2012-08-05/2012-08-09
Department(s) LR - Animal Nutrition
Adaptation Physiology
Animal Nutrition
WIAS
Publication type Contribution in proceedings
Publication year 2012
Abstract Environmental factors, e.g. temperature (T), feather cover (FC), and housing system (HS) affect energy requirements of laying hens. Interaction effects of T (11°C, 16°C, 21°C), FC (100% vs. 50%) and HS (cage vs. floor) on energy partitioning and performance of laying hens were investigated. Six batches of 70 brown layers per batch were applied. Heat production (HP) was determined by indirect calorimetry. ME-intake increased by 1% for each degree reduction in T. HP was not affected by T in hens with 100% FC, whereas in hens with 50% FC HP linearly increased if T decreased. In floor housing, HP at 16°C and 11°C was 5.8% and 3.0% higher, respectively, than in cages. NE for production (NEp) was 25.7% higher in cages compared to floor housing. In cages, 24.7% of NEp was spent on body fat deposition, whereas in floor housing 9.0% of NEp was released from body fat reserves. ME-intake (kJ/d) was predicted by: 586 BW0.75 – 7.94 T + 26.84 Daily gain + 11.36 Egg mass – 0.993 FC – 36.2 HS (0 = cages, 1 = floor; R2 = 0.75). Despite considerable differences among treatments, egg performances were not affected, indicating the adaptive capacity of layers to a broad range of environmental conditions.
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