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 533770
Title Effect of whole wheat inclusion and pellet diameter on pellet quality and performance in broilers
Author(s) Raaijmakers, M.M.P.; Loon, Jorik van; Elling-Staats, M.L.; Poel, A.F.B. van der; Kwakkel, R.P.
Event 21th European Symposium on Poultry Nutrition, Salou/Vila-Seca, 2017-05-08/2017-05-11
Department(s) Animal Nutrition
WIAS
Publication type Contribution in proceedings
Publication year 2017
Abstract Whole wheat (WW) is mainly fed to broilers along with a pelleted feed, which allows birds to select particles leading to inconsistent results. WW inclusion in a pellet may require larger pellets to maintain coarse structure and pellet quality. The effect of WW vs ground wheat (GW) inclusion and pellet diameter (4 vs 6 mm) on pellet quality and performance was investigated, using a 2x2 factorial design with 6 replicates per treatment (9 Ross 308 males per pen). An additional group was fed a reference diet (RD) containing GW in a 3 mm pellet diameter. From day 0-7, all birds received a crumble starter diet (250 g/kg GW). From day 8-14, one group received the RD and the other 4 groups a 4 mm pelleted diet, which included either GW or WW. From day 15-34, half of these 4 groups received the 6 mm pelleted diets (GW or WW). Formulations of all diets from day 8-34 were similar (350 g/kg wheat). Pellet durability, tested using a Ligno tester, was the highest in the RD (75.5%), tested with sieve size 2.1 mm. When tested with sieve size 3.6 mm, GW 6 mm had the highest durability (59.7%) and the lowest durabilities were found using both sieves in WW 6 mm diets (60.8% and 36.6% for 2.1 and 3.6 mm, respectively). Feed intake (FI) and feed conversion ratio (FCR) was higher for GW vs WW diets from day 8-14 (53.6 vs 51.1 g/d, P=0.032 and 1.314 vs 1.269, P=0.038, respectively). For RD the lowest FCR (1.240, P=0.031) and highest bodyweight gain (BWG) (44.0g, P=0.010) was found. From day 15-34, FI and BWG was also higher for GW vs WW diets (154.9 vs 148.6 g, P<0.001 and 107.8 vs 103.9 g, P<0.001, respectively). Furthermore, FCR was better for the 4 mm pellet compared to the 6 mm pellet (1.408 vs 1.425, P=0.014); RD showed the lowest FI (145.5 g/d, P<0.001) and BWG (102.7 g, P=0.011), FCR remained unaffected. Overall, these results showed that 4 and 6 mm pellets vs 3 mm improve FI and BWG and that WW in pellets (vs GW) reduces FI and BWG, but improves FCR.
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