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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    Effect of constant or weekly varied eggshell temperature during incubation on broiler performance up until slaughter age
    Wijnen, H.J. ; Roovert-Reijrink, Inge van; Eijk-Priester, Marieke van; Pol, C. van der; Molenaar, R. ; Brand, H. van den - \ 2018
    In: The XVth European Poultry Conference (EPC). - Zagreb, Croatia : Croatian Branch of the World's Poultry Science Association - ISBN 9789082915709 - p. 498 - 498.
    broiler - eggshell temperature - incubation - performance - compensatory growth - delayed nutrition - early nutrition
    After hatching in conventional systems, broiler chickens have a delay to nutrition thatcan last for 72h, depending on length of the hatch window, internal hatchery proceduresand transport duration. Previous research on early life feeding strategies has shownnegative effects on bodyweight (BW) gain after delayed nutrition (DN), compared withearly nutrition (EN). However, it is not known whether DN chickens can (partially)compensate for their lower BW between hatch and slaughter. In this study, we tested thehypothesis that DN chickens have an increased growth rate, as a result of compensatorygrowth. Data from 3 independent experiments were used. In these studies, broilerswere subjected to either EN or DN with different durations of DN (38 to 72 h) and daysto slaughter (14 to 35 d). In all experiments, DN groups had lower BW compared withEN which was sustained until slaughter. Relative differences in BW, however, decreasedfrom 114 to 176% post placement to 102 – 112 % at slaughter (35 d). Growth curves of DNand EN chickens were analysed to study whether compensatory growth could explain thedifferences in BW between EN and DN. Absolute average daily gain (aADG) was higher inEN chickens from start until slaughter. To analyse the growth curve independent of BW,relative ADG (rADG) between two ages was calculated as follows:Differences in rADG between DN and EN chickens were greater in the first 14 d (DN:63%, EN: 47%; P < 0.001), but smaller in the remaining grow-out period (14 – 28 d:DN: 18%, EN: 16%; 28 – 35 d: DN: 8%, EN: 7%; both P <0 .001). Based on these results,it seems that DN broilers compensate for their lag in BW during the first 14 d postplacement. As differences in absolute BW were still present at 35 d, the increase in rADGseems insufficient to catch up with EN broilers. EN chickens have higher aADG untilslaughter, however, rADG is lower, showing that growth rate is influenced by feedingstrategy. Previous literature describes interactions between compensatory growth andnutrient composition of diets on nitrogen and fat retention. This may give reason forfuture work to evaluate effects of early life feeding strategy on carcass traits.
    The effect of different eggshell temperature patterns during incubation on broiler chicken behavior determined by an automatic tracking system
    Molenaar, R. ; Haas, E.N. de; Rodenburg, T.B. ; Olde Bolhaar, Lara ; Wijnen, H.J. ; Brand, H. van den - \ 2018
    In: The XVth European Poultry Conference (EPC). - Zagreb, Croatia : Croatian Branch of the World's Poultry Science Association - ISBN 9789082915709 - p. 248 - 248.
    behaviour - broiler chicken - incubation - tracking - compensatory growth - delayed nutrition - early nutrition

    Growth rate of broiler chickens is influenced by early life feeding strategy
    Hollemans, M.S. ; Lammers, A. ; Vries, S. de - \ 2018
    In: The XVth European Poultry Conference (EPC). - Zagreb, Croatia : - ISBN 9789082915709 - p. 579 - 579.
    delayed nutrition - early nutrition - Intestinal permeability - compensatory growth
    After hatching in conventional systems, broiler chickens have a delay to nutrition thatcan last for 72h, depending on length of the hatch window, internal hatchery proceduresand transport duration. Previous research on early life feeding strategies has shownnegative effects on bodyweight (BW) gain after delayed nutrition (DN), compared withearly nutrition (EN). However, it is not known whether DN chickens can (partially)compensate for their lower BW between hatch and slaughter. In this study, we tested thehypothesis that DN chickens have an increased growth rate, as a result of compensatorygrowth. Data from 3 independent experiments were used. In these studies, broilerswere subjected to either EN or DN with different durations of DN (38 to 72 h) and daysto slaughter (14 to 35 d). In all experiments, DN groups had lower BW compared withEN which was sustained until slaughter. Relative differences in BW, however, decreasedfrom 114 to 176% post placement to 102 – 112 % at slaughter (35 d). Growth curves of DNand EN chickens were analysed to study whether compensatory growth could explain thedifferences in BW between EN and DN. Absolute average daily gain (aADG) was higher inEN chickens from start until slaughter. To analyse the growth curve independent of BW,relative ADG (rADG) between two ages was calculated as follows:Differences in rADG between DN and EN chickens were greater in the first 14 d (DN:63%, EN: 47%; P < 0.001), but smaller in the remaining grow-out period (14 – 28 d:DN: 18%, EN: 16%; 28 – 35 d: DN: 8%, EN: 7%; both P <0 .001). Based on these results,it seems that DN broilers compensate for their lag in BW during the first 14 d postplacement. As differences in absolute BW were still present at 35 d, the increase in rADGseems insufficient to catch up with EN broilers. EN chickens have higher aADG untilslaughter, however, rADG is lower, showing that growth rate is influenced by feedingstrategy. Previous literature describes interactions between compensatory growth andnutrient composition of diets on nitrogen and fat retention. This may give reason forfuture work to evaluate effects of early life feeding strategy on carcass traits.
    Body weight is affected by early life feeding strategy and hatch moment in broiler chickens
    Hollemans, M.S. ; Noorloos, Marit ; Vries, S. de; Lammers, A. - \ 2018
    In: The XVth European Poultry Conference (EPC). - Zagreb, Croatia : - ISBN 9789082915709 - p. 259 - 259.
    delayed nutrition - early nutrition - Intestinal permeability - compensatory growth
    After hatching in conventional systems, broiler chickens have a delay to nutrition that can last for 72h, depending on length of the hatch window, internal hatchery procedures and transport duration. Previous research on early life feeding strategies has shown negative effects on bodyweight (BW) gain after delayed nutrition (DN), compared with early nutrition (EN). However, it is not known whether DN chickens can (partially)compensate for their lower BW between hatch and slaughter. In this study, we tested the hypothesis that DN chickens have an increased growth rate, as a result of compensatory growth. Data from 3 independent experiments were used. In these studies, broilers were subjected to either EN or DN with different durations of DN (38 to 72 h) and days to slaughter (14 to 35 d). In all experiments, DN groups had lower BW compared withEN which was sustained until slaughter. Relative differences in BW, however, decreased from 114 to 176% post placement to 102 – 112 % at slaughter (35 d). Growth curves of DN and EN chickens were analysed to study whether compensatory growth could explain the differences in BW between EN and DN. Absolute average daily gain (aADG) was higher in EN chickens from start until slaughter. To analyse the growth curve independent of BW, relative ADG (rADG) between two ages was calculated as follows: Differences in rADG between DN and EN chickens were greater in the first 14 d (DN:63%, EN: 47%; P < 0.001), but smaller in the remaining grow-out period (14 – 28 d:DN: 18%, EN: 16%; 28 – 35 d: DN: 8%, EN: 7%; both P <0 .001). Based on these results,it seems that DN broilers compensate for their lag in BW during the first 14 d postplacement. As differences in absolute BW were still present at 35 d, the increase in rADG seems insufficient to catch up with EN broilers. EN chickens have higher aADG until slaughter, however, rADG is lower, showing that growth rate is influenced by feeding strategy. Previous literature describes interactions between compensatory growth and nutrient composition of diets on nitrogen and fat retention. This may give reason for future work to evaluate effects of early life feeding strategy on carcass traits.
    Effect of constant or weekly varied eggshell temperature during incubation on broiler performance up until slaughter age
    Wijnen, H.J. ; Roovert-Reijrink, Inge Van; Priester, Marieke ; Pol, C.W. van der; Molenaar, R. ; Brand, H. van den - \ 2018
    broiler - eggshell temperature - incubation - performance - compensatory growth - delayed nutrition - early nutrition
    During incubation, embryo development is particularly influenced by temperature. Thevast majority of commercial hatcheries aim at a constant eggshell temperature (EST) of37.8°C throughout incubation. However, it has been shown recently that lowering EST(36.7°C) in the last week of incubation might improve embryo development, as higher(yolk-free) body mass and relative organ weights at hatch were found. In addition,raising EST slightly in phases during which oxygen is not limited yet (before the lastweek of incubation), might improve embryo development as well. It is hypothesizedthat a lower EST (36.7°) in the last week of incubation and a higher EST (38.9°C) in thesecond week of incubation improve embryo development and perinatal chick qualitycompared to a constant intermediate EST (37.6°) throughout incubation. Moreover,EST during incubation might have long term effects on broiler performance as theincubation period covers a substantial part of their whole lifespan and as it is knownfor many animal species that perinatal experiences have an impact in later life. Totest this hypothesis, Ross 308 eggs from a prime parent flock were incubated in a 2x2experimental design. All eggs were incubated at a normal (37.8°C) EST until embryonicday (E) 7. Thereafter, eggs were either incubated at a normal (37.8°C) or high (38.9°C)EST during the second week (E7 – E14) of incubation and a normal (37.8°C) or low(36.7°C) EST during the last week (E14 – E21) of incubation. Within 6 hours afterhatch, chick development was evaluated by chick weight, length, navelscore, and organweights. Posthatch, 5 males and 5 females were housed in a 2 m2 pen with 8 replicatesper treatment (n=320) and reared until slaughter age (D42). Growth and feed intakewere monitored weekly. At D28, D35, and D39 gait was scored from all animals. Atslaughter, foot-pad dermatitis, hock burns, and carcass characteristics were determined.Preliminary results indicate that a low EST from E15 onwards results in slower growthand on average 103 g. lower body weight at slaughter. Other parameters were notsignificantly different or not analysed yet (e.g. carcass characteristics) at the moment ofabstract submission.
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