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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    Two novel porcine teschovirus strains as the causative agents of encephalomyelitis in the Netherlands
    Vreman, Sandra ; Caliskan, Nermin ; Harders, Frank ; Boonstra, Jan ; Peperkamp, Klaas ; Ho, Cynthia K.Y. ; Kuller, Wikke ; Kortekaas, Jeroen - \ 2020
    BMC Veterinary Research 16 (2020)1. - ISSN 1746-6148
    Non-suppurative encephalomyelitis - Porcine teschovirus - Weanling pigs

    Background: Porcine teschovirus (PTV) circulates among wild and domesticated pig populations without causing clinical disease, however neuroinvasive strains have caused high morbidity and mortality in the past. In recent years, several reports appeared with viral agents as a cause for neurologic signs in weanling and growing pigs among which PTV and new strains of PTV were described. Case presentation: On two unrelated pig farms in the Netherlands the weanling pig population showed a staggering gate, which developed progressively to paresis or paralysis of the hind legs with a morbidity up to 5%. After necropsy we diagnosed a non-suppurative encephalomyelitis on both farms, which was most consistent with a viral infection. PTV was detected within the central nervous system by qPCR. From both farms PTV full-length genomes were sequenced, which clustered closely with PTV-3 (98%) or PTV-11 (85%). Other common swine viruses were excluded by qPCR and sequencing of the virus. Conclusion: Our results show that new neuroinvasive PTV strains still emerge in pigs in the Netherlands. Further research is needed to investigate the impact of PTV and other viral agents causing encephalomyelitis within wild and domestic pig populations supported by the awareness of veterinarians.

    Use of Repeated Blood Pressure and Cholesterol Measurements to Improve Cardiovascular Disease Risk Prediction : An Individual-Participant-Data Meta-Analysis
    Paige, Ellie ; Barrett, Jessica ; Pennells, Lisa ; Sweeting, Michael ; Willeit, Peter ; Angelantonio, Emanuele Di; Gudnason, Vilmundur ; Nordestgaard, Børge G. ; Psaty, Bruce M. ; Goldbourt, Uri ; Best, Lyle G. ; Assmann, Gerd ; Salonen, Jukka T. ; Nietert, Paul J. ; Verschuren, W.M.M. ; Brunner, Eric J. ; Kronmal, Richard A. ; Salomaa, Veikko ; Bakker, Stephan L.J. ; Dagenais, Gilles R. ; Sato, Shinichi ; Jansson, Jan Håkan ; Willeit, Johann ; Onat, Altan ; La Cámara, Agustin Gómez De; Roussel, Ronan ; Völzke, Henry ; Dankner, Rachel ; Tipping, Robert W. ; Meade, Tom W. ; Donfrancesco, Chiara ; Kuller, Lewis H. ; Peters, Annette ; Gallacher, John ; Kromhout, Daan ; Iso, Hiroyasu ; Knuiman, Matthew W. ; Casiglia, Edoardo ; Kavousi, Maryam ; Palmieri, Luigi ; Sundström, Johan ; Davis, Barry R. ; Njølstad, Inger ; Couper, David ; Danesh, John ; Thompson, Simon G. ; Wood, Angela M. - \ 2017
    American Journal of Epidemiology 186 (2017)8. - ISSN 0002-9262 - p. 899 - 907.
    Cardiovascular disease - Longitudinal measurements - Repeated measurements - Risk factors - Risk prediction
    The added value of incorporating information from repeated blood pressure and cholesterol measurements to predict cardiovascular disease (CVD) risk has not been rigorously assessed. We used data on 191,445 adults from the Emerging Risk Factors Collaboration (38 cohorts from 17 countries with data encompassing 1962-2014) with more than 1 million measurements of systolic blood pressure, total cholesterol, and high-density lipoprotein cholesterol. Over a median 12 years of follow-up, 21,170 CVD events occurred. Risk prediction models using cumulative mean values of repeated measurements and summary measures from longitudinal modeling of the repeated measurements were compared with models using measurements from a single time point. Risk discrimination (Cindex) and net reclassification were calculated, and changes in C-indices were meta-analyzed across studies. Compared with the single-time-point model, the cumulative means and longitudinal models increased the C-index by 0.0040 (95% confidence interval (CI): 0.0023, 0.0057) and 0.0023 (95% CI: 0.0005, 0.0042), respectively. Reclassification was also improved in both models; compared with the single-time-point model, overall net reclassification improvements were 0.0369 (95% CI: 0.0303, 0.0436) for the cumulative-means model and 0.0177 (95% CI: 0.0110, 0.0243) for the longitudinal model. In conclusion, incorporating repeated measurements of blood pressure and cholesterol into CVD risk prediction models slightly improves risk prediction.
    Scenario analysis of rainwater harvesting and use on a large scale–assessment of runoff, storage and economic performance for the case study Amsterdam Airport Schiphol
    Kuller, Martijn ; Dolman, N.J. ; Vreeburg, J.H.G. ; Spiller, Marc - \ 2017
    Urban Water Journal 14 (2017)3. - ISSN 1573-062X - p. 237 - 246.
    airport - economic viability - quantitative scenario analysis - Rainwater harvesting - sustainable urban water management

    Research on rainwater harvesting mainly focuses on a building scale. Scant information is available about its performance on a large scale. This study aims to determine the potential for, and economic viability of meeting non-potable water demand by rainwater harvesting for a large scale case (21.5 km2): Amsterdam Airport Schiphol. A dynamic model was developed to analyse scenarios of varying rainfall, catchment surfaces and storage capacity. Four potential system configurations of catchments and non-potable uses were analysed for their economic performance with different water prices and storage options. This study found that, given sufficient storage and catchment size, all non-potable water demand of Schiphol can be supplied, reducing drinking water demand by up to 58%. Diminishing returns for adding storage and catchment to the system make full supply inefficient. Current water charges make most large scale system configurations not viable due to high investment costs for supply networks and storage infrastructure.

    Assessing the potential for rainwater harvesting at Amsterdam Airport Schiphol
    Kuller, M. ; Dolman, N.J. ; Vreeburg, J.H.G. ; Spiller, M. - \ 2016
    Global Water Forum (2016). - 6 p.
    Association of Cardiometabolic Multimorbidity With Mortality
    Angelantonio, Emanuele Di; Kaptoge, Stephen ; Wormser, David ; Willeit, Peter ; Butterworth, Adam S. ; Bansal, Narinder ; O’Keeffe, Linda M. ; Gao, Pei ; Wood, Angela M. ; Burgess, Stephen ; Freitag, Daniel F. ; Pennells, Lisa ; Peters, Sanne A. ; Hart, Carole L. ; Håheim, Lise Lund ; Gillum, Richard F. ; Nordestgaard, Børge G. ; Psaty, Bruce M. ; Yeap, Bu B. ; Knuiman, Matthew W. ; Nietert, Paul J. ; Kauhanen, Jussi ; Salonen, Jukka T. ; Kuller, Lewis H. ; Simons, Leon A. ; Schouw, Yvonne T. van der; Barrett-Connor, Elizabeth ; Selmer, Randi ; Crespo, Carlos J. ; Rodriguez, Beatriz ; Verschuren, Monique W.M. ; Salomaa, Veikko ; Svärdsudd, Kurt ; Harst, Pim Van Der; Björkelund, Cecilia ; Wilhelmsen, Lars ; Wallace, Robert B. ; Brenner, Hermann ; Amouyel, Philippe ; Barr, Elizabeth L.M. ; Iso, Hiroyasu ; Onat, Altan ; Trevisan, Maurizio ; agostino, Ralph B. D'; Cooper, Cyrus ; Kavousi, Maryam ; Welin, Lennart ; Roussel, Ronan ; Hu, Frank B. ; Sato, Shinichi ; Davidson, Karina W. ; Howard, Barbara V. ; Leening, Maarten J.G. ; Rosengren, Annika ; Dörr, Marcus ; Deeg, Dorly J.H. ; Kiechl, Stefan ; Stehouwer, Coen D.A. ; Nissinen, Aulikki ; Giampaoli, Simona ; Donfrancesco, Chiara ; Kromhout, Daan ; Price, Jackie F. ; Peters, Annette ; Meade, Tom W. ; Casiglia, Edoardo ; Lawlor, Debbie A. ; Gallacher, John ; Nagel, Dorothea ; Franco, Oscar H. ; Assmann, Gerd ; Dagenais, Gilles R. ; Jukema, Wouter J. ; Sundström, Johan ; Woodward, Mark ; Brunner, Eric J. ; Khaw, Kay-Tee ; Wareham, Nicholas J. ; Whitsel, Eric A. ; Njølstad, Inger ; Hedblad, Bo ; Wassertheil-Smoller, Sylvia ; Engström, Gunnar ; Rosamond, Wayne D. ; Selvin, Elizabeth ; Sattar, Naveed ; Thompson, Simon G. ; Danesh, John - \ 2015
    JAMA: The Journal of the American Medical Association 314 (2015)1. - ISSN 0098-7484 - p. 52 - 60.
    Importance The prevalence of cardiometabolic multimorbidity is increasing.

    Objective To estimate reductions in life expectancy associated with cardiometabolic multimorbidity.

    Design, Setting, and Participants Age- and sex-adjusted mortality rates and hazard ratios (HRs) were calculated using individual participant data from the Emerging Risk Factors Collaboration (689 300 participants; 91 cohorts; years of baseline surveys: 1960-2007; latest mortality follow-up: April 2013; 128 843 deaths). The HRs from the Emerging Risk Factors Collaboration were compared with those from the UK Biobank (499 808 participants; years of baseline surveys: 2006-2010; latest mortality follow-up: November 2013; 7995 deaths). Cumulative survival was estimated by applying calculated age-specific HRs for mortality to contemporary US age-specific death rates.

    Exposures A history of 2 or more of the following: diabetes mellitus, stroke, myocardial infarction (MI).

    Main Outcomes and Measures All-cause mortality and estimated reductions in life expectancy.
    Results In participants in the Emerging Risk Factors Collaboration without a history of diabetes, stroke, or MI at baseline (reference group), the all-cause mortality rate adjusted to the age of 60 years was 6.8 per 1000 person-years. Mortality rates per 1000 person-years were 15.6 in participants with a history of diabetes, 16.1 in those with stroke, 16.8 in those with MI, 32.0 in those with both diabetes and MI, 32.5 in those with both diabetes and stroke, 32.8 in those with both stroke and MI, and 59.5 in those with diabetes, stroke, and MI. Compared with the reference group, the HRs for all-cause mortality were 1.9 (95% CI, 1.8-2.0) in participants with a history of diabetes, 2.1 (95% CI, 2.0-2.2) in those with stroke, 2.0 (95% CI, 1.9-2.2) in those with MI, 3.7 (95% CI, 3.3-4.1) in those with both diabetes and MI, 3.8 (95% CI, 3.5-4.2) in those with both diabetes and stroke, 3.5 (95% CI, 3.1-4.0) in those with both stroke and MI, and 6.9 (95% CI, 5.7-8.3) in those with diabetes, stroke, and MI. The HRs from the Emerging Risk Factors Collaboration were similar to those from the more recently recruited UK Biobank. The HRs were little changed after further adjustment for markers of established intermediate pathways (eg, levels of lipids and blood pressure) and lifestyle factors (eg, smoking, diet). At the age of 60 years, a history of any 2 of these conditions was associated with 12 years of reduced life expectancy and a history of all 3 of these conditions was associated with 15 years of reduced life expectancy.

    Conclusions and Relevance Mortality associated with a history of diabetes, stroke, or MI was similar for each condition. Because any combination of these conditions was associated with multiplicative mortality risk, life expectancy was substantially lower in people with multimorbidity.
    Haalbaarheidstudie: regenwater opvangen en benutten op luchthaven Schiphol
    Kuller, M. ; Dolman, N. ; Spiller, M. ; Vreeburg, J.H.G. - \ 2014
    H2O online (2014)19 sept..
    luchthavens - regenwateropvang - neerslag - watervoorziening - nieuwe sanitatie - haarlemmermeer - airports - water harvesting - precipitation - water supply - new sanitation - haarlemmermeer
    Voor een effectieve bescherming van beschikbare (zoet)waterbronnen is het opvangen en benutten van regenwater op regionale schaal noodzakelijk, evenals het vergroten van de regionale zelfvoorzienendheid. Deze studie op het terrein van luchthaven Schiphol laat zien dat regenwateropvang van verschillende oppervlakten haalbaar is, maar dat voor volledige dekking een vrij grote berging noodzakelijk is.
    Chronic Allopurinol Treatment during the Last Trimester of Pregnancy in Sows: Effects on Low and Normal Birth Weight Offspring
    Gieling, E.T. ; Antonides, A. ; Fink-Gremmels, J. ; Haar, K. ter; Kuller, W.I. ; Meijer, E. ; Nordquist, R.E. ; Stouten, J.M. ; Zeinstra, E. ; Staay, F.J. van der - \ 2014
    PLoS ONE 9 (2014)1. - ISSN 1932-6203 - 15 p.
    intrauterine growth-restriction - for-gestational-age - children born - placental insufficiency - attentional problems - newborn piglets - spleen weight - brain - memory - stress
    Low-birth-weight (LBW) children are born with several risk factors for disease, morbidity and neonatal mortality, even if carried to term. Placental insufficiency leading to hypoxemia and reduced nutritional supply is the main cause for LBW. Brain damage and poor neurological outcome can be the consequence. LBW after being carried to term gives better chances for survival, but these children are still at risk for poor health and the development of cognitive impairments. Preventive therapies are not yet available. We studied the risk/efficacy of chronic prenatal treatment with the anti-oxidative drug allopurinol, as putative preventive treatment in piglets. LBW piglets served as a natural model for LBW. A cognitive holeboard test was applied to study the learning and memory abilities of these allopurinol treated piglets after weaning. Preliminary analysis of the plasma concentrations in sows and their piglets suggested that a daily dose of 15 mg.kg-1 resulted in effective plasma concentration of allopurinol in piglets. No adverse effects of chronic allopurinol treatment were found on farrowing, birth weight, open field behavior, learning abilities, relative brain, hippocampus and spleen weights. LBW piglets showed increased anxiety levels in an open field test, but cognitive performance was not affected by allopurinol treatment. LBW animals treated with allopurinol showed the largest postnatal compensatory body weight gain. In contrast to a previous study, no differences in learning abilities were found between LBW and normal-birth-weight piglets. This discrepancy might be attributable to experimental differences. Our results indicate that chronic prenatal allopurinol treatment during the third trimester of pregnancy is safe, as no adverse side effects were observed. Compensatory weight gain of treated piglets is a positive indication for the chronic prenatal use of allopurinol in these animals. Further studies are needed to assess the possible preventive effects of allopurinol on brain functions in LBW piglets.
    Intermittent suckling affects feeder visiting behaviour in litters with low feed intake
    Kuller, W.I. ; Soede, N.M. ; Bolhuis, J.E. ; Beers-Schreurs, H.M.G. van; Kemp, B. ; Verheijden, J.H.M. ; Taverne, M.A.M. - \ 2010
    Livestock Science 127 (2010)2-3. - ISSN 1871-1413 - p. 137 - 143.
    social facilitation - weight-gain - solid food - pigs - piglets - performance - consumption - growth - birth
    Intermittent suckling (IS) has proven to stimulate creep feed intake in suckling piglets. This paper describes the development of feeding behaviour in three litters with high (H) and three litters with low (L) feed intake during lactation in both control (C) and IS treatment. In order to synchronize the start of intermittent suckling within a farrowing room, treatment day 0 (T0) was designated as the start of data collection. IS litters were separated from the sow for a period of 12 h/day (0930 to 2130) from T14 to weaning (T25). Feeder visits of individual piglets and nursing behaviour were analysed from continuous video recordings at 5 treatment days: T13, T16, T24, T25 and T26. A high number of CL piglets never visited the feeder during lactation; at T24, 56% of the CL piglets did not visit the feeder. On the other hand, 91% of the ISL and CH piglets and all ISH piglets visited the feeder at least once at T24. In contrast to the other groups, no increase was seen in visiting frequency during lactation in CL piglets. At T24, visiting frequency was higher in ISL than in CL piglets. So, IS stimulated piglets from low feed intake litters to visit the feeder. Between T16 and T24, total feeder time increased in piglets from all groups (P <0.05), except in CL piglets in which no change was found (P > 0.10). Latency to first visit to the feeder after weaning did not differ between groups. It is concluded that IS stimulates piglets from litters with a low level of creep feed intake to visit the feeder during lactation, which familiarizes them with the feeder and the feed during lactation. The IS treatment does not affect feeder visiting behaviour of piglets with an anyhow high level of feed intake during lactation
    Consequences of intermittent suckling for performance in the pig
    Kuller, W.I. - \ 2008
    Utrecht University. Promotor(en): J.H.M. Verheijden; M.A.M. Taverne; Bas Kemp, co-promotor(en): Nicoline Nieuwenhuizen-Soede; H.M.G. van Beers-Schreurs. - - 139 p.
    Addition of chromic oxide to creep feed as a fecal marker for selection of creep feed-eating suckling pigs
    Kuller, W.I. ; Beers-Schreurs, H.M.G. van; Soede, N.M. ; Taverne, M.A.M. ; Kemp, B. ; Verheijden, J.H.M. - \ 2007
    American Journal of Veterinary Research 68 (2007)7. - ISSN 0002-9645 - p. 748 - 752.
    weanling pigs - performance - consumption
    Objective-To determine whether the addition of chromic oxide (Cr2O3) to creep feed could be used as a visual marker in feces for selection of creep feed-eating suckling pigs. Animals-20 suckling pigs. Procedures-Via syringe, 5 pigs (2 to 3 days old on day 0; 1 pig/treatment) from each of 4 litters received oral administrations of 10, 20, 30, or 40 g of creep feed containing 10 g of Cr2O3 center dot kg(-1) on each of 2 consecutive days (days 20 and 21) or 30 g of creep feed containing 10 g of Cr2O3 center dot kg(-1) on day 20 and 30 g of Cr2O3 free creep feed on day 21. On days 21 through 24, 6 fecal samples were collected from each pig at regular intervals between 8:00 Am and 6:00 Pm. Green-colored feces were considered indicative of creep feed consumption (eaters). Data analyses were based on single and multiple fecal samples. Results-On day 22, evaluation of 1 fecal sample/pig and multiple fecal samples per pig resulted in identification of as many as 40% and only 15% of the feed-treated pigs wrongly as noneaters, respectively. Repeated sampling over multiple days would identify 99% of eaters accurately. Pigs erroneously identified as noneaters were those administered either low amounts of Cr2O3 supplemented creep feed for 2 days or Cr2O3 supplemented creep feed on only 1 day. Conclusions and Clinical Relevance-Data suggest that addition of Cr2O3 to creep feed enables selection of individual creep feed-eating suckling pigs via examination of feces, provided that repeated fecal samples are evaluated.
    Creep feed intake during lactation enhances net absorption in the small intestine after weaning
    Kuller, W.I. ; Beers-Schreurs, H.M.G. van; Soede, N.M. ; Langendijk, P. ; Taverne, M.A.M. ; Kemp, B. ; Verheijden, J.H.M. - \ 2007
    Livestock Science 108 (2007)1-3. - ISSN 1871-1413 - p. 99 - 101.
    performance - pigs
    The aim of the study was to measure the effect of creep feeding during lactation on net absorption in the small intestine at 4 days after weaning. Intermittent suckling was used to increase creep feed intake during lactation. Creep feed containing chromic oxide was provided. Based on the colour of the faeces, piglets were classified as `eaters¿ or `non-eaters¿, respectively. At day 4 after weaning, an in vivo small intestine segment perfusion test was performed at 5 sites along the small intestine in 24 piglets (12 eaters and 12 non-eaters). At both sides of each intestinal segment a tube was fitted to perfuse and drain fluid in order to assess net absorption. Net absorption was higher in eaters than in non-eaters (P <0.001). Net absorption varied greatly between and within piglets and was highest in the caudal segments of the small intestine (P <0.001). These data suggest that creep feeding could be a useful tool in the prevention of post-weaning diarrhoea.
    Effects of intermittent suckling and creep feed intake on pig performance from birth to slaughter
    Kuller, W.I. ; Soede, N.M. ; Beers-Schreurs, H.M.G. van; Langendijk, P. ; Taverne, M.A.M. ; Kemp, B. ; Verheijden, J.H.M. - \ 2007
    Journal of Animal Science 85 (2007). - ISSN 0021-8812 - p. 1295 - 1301.
    reproductive-performance - lactating sows - weanling pigs - consumption - estrus - fertility - piglets
    An experiment was conducted to determine if the improved creep feed intake observed during intermittent suckling (IS) is important for postweaning performance. Therefore, creep feed intake of litters was assessed, and within litters, eaters and noneaters were distinguished using chromic oxide as an indigestible marker. Batches of sows were suckled intermittently (IS, 7 batches; n = 31) or continuously (control, 7 batches; n = 31). In the IS group, litters were separated from the sow for a period of 12 h/d (0930 to 2130), beginning 11 d before weaning. Litters were weaned at 4 wk of age. Litters had free access to creep feed from 1 wk of age onward. Five days after weaning, the piglets were moved as a litter to weanling pens. At 8 wk of age, 2 barrows and 2 gilts were randomly chosen from each litter and moved to a finishing facility. Feed intake was improved by IS during the last 11 d of lactation (IS, 284 ± 27 vs. control, 83 ± 28 g/piglet; P <0.001) and after weaning during the first (IS, 201 ± 24 vs. control, 157 ± 25 g·piglet¿1·d¿1; P <0.05) and second (IS, 667 ± 33 vs. control, 570 ± 35 g·piglet¿1·d¿1; P <0.05) wk. Thereafter, no differences were found to slaughter. Weaning BW was lower in IS litters (IS, 7.1 ± 0.01 vs. control, 8.1 ± 0.01 kg/piglet; P <0.05), but 7 d after weaning BW was similar (IS, 8.5 ± 0.2 vs. control, 8.7 ± 0.2 kg/piglet; P = 0.18), and no differences were found to slaughter. The percentage of eaters within a litter was not increased by IS during lactation (IS, 23 ± 4.5% vs. control, 19 ± 4.1%; P = 0.15). Weaning BW did not differ between eaters and noneaters (eater, 7.7 ± 0.1 vs. noneater, 7.5 ± 0.08 kg/piglet; P = 0.63). From 1 until 4 wk after weaning, piglets that were eaters during lactation had heavier BW than noneaters (eater, 20.3 ± 0.3 kg vs. noneater, 18.2 ± 0.2 kg; P <0.05). The influence of eating creep feed during lactation on BW and ADG and the influence of suckling treatment never showed an interaction. We conclude that IS increases ADFI during lactation on a litter level and improves ADG in the first week and ADFI in the first and second weeks after weaning. No long-term effects on ADFI or ADG were observed throughout the finishing period. In the current experiment, in which creep feed intake was low, the percentage of eaters within a litter was not increased, suggesting that creep feed intake of piglets that were already eating was stimulated by IS. Further, piglets that were eaters during lactation had heavier BW up to 4 wk after weaning.
    Effect of creep feed intake before weaning on the small intestine of intermittently or continuously suckled pig
    Kuller, W.I. ; Beers-Schreurs, H.M.G. van; Soede, N.M. ; Taverne, M.A.M. ; Kemp, B. ; Verheijden, J.H.M. - \ 2006
    Intermittent suckling: a system that benefits piglets?
    Kuller, W.I. ; Soede, N.M. ; Beers-Schreurs, H.M.G. van; Langendijk, P. ; Taverne, M.A.M. ; Verheijden, J.H.M. ; Kemp, B. - \ 2005
    Effect of Intermittent Suckling of Follicular Development during Lactation
    Soede, N.M. ; Kuller, W.I. ; Langendijk, P. ; Beers-Schreurs, H.M.G. van; Taverne, M.A.M. ; Kemp, B. ; Verheijden, J.H.M. - \ 2004
    In: Reproduction in Domestic Animals, 8th Conference of the European Society for Domestic Animal Reproduction, Warsaw, Poland, 23-25 September 2004. - Berlin, Germany : Blackwell Verlag GmbH - p. 285 - 285.
    Intermittent suckling: Effect of feed intake before weaning on net absorption in the small intestine
    Kuller, W.I. ; Beers-Schreurs, H.M.G. van; Soede, N.M. ; Langendijk, P. ; Taverne, M.A.M. ; Kemp, B. ; Verheijden, J.H.M. - \ 2004
    In: Proceedings of the 18th IPVS congress, Hoya, Germany, 27 June - 1 Juky 2004. - Hoya, Germany : IPVS Veranstaltungs GmbH - p. 726 - 726.
    Effect of intermittent suckling on follicular development during lactation
    Kuller, W.I. ; Soede, N.M. ; Langendijk, P. ; Beers-Schreurs, H.M.G. van; Taverne, M.A.M. ; Kemp, B. ; Verheijden, J.H.M. - \ 2004
    In: Proceedings of the 18th IPVS congress, Hoya, Germany, 27 June - 1 July 2004. - Hoya, Germany : IPVS Veranstaltungs GmbH - p. 472 - 472.
    Intermittent suckling: Effects on piglet and sow performance before and after weaning
    Kuller, W.I. ; Soede, N.M. ; Beers-Schreurs, H.M.G. van; Langendijk, P. ; Taverne, M.A.M. ; Verheijden, J.H.M. ; Kemp, B. - \ 2004
    Journal of Animal Science 82 (2004)2. - ISSN 0021-8812 - p. 405 - 413.
    creep feed consumption - individual variation - litter separation - small-intestine - lactating sows - boar exposure - weanling pigs - estrus - fertility - growth
    An experiment was conducted to study effects of intermittent suckling on creep feed intake and weight gain of litters. Loss of weight and backfat during lactation, as well as reproductive performance, were also measured. Batches of multiparous sows (Parity I to 12, 4.1 on average) were either suckled intermittently (IS, eight batches; n = 50) or continuously (control, eight batches; n = 62). Litters were weaned at 27 +/- 2 d of age, on average. Litter size (11.1 +/- 0.2 piglets, on average) was standardized within a batch within 3 d of birth. All litters had free access to creep feed and water from 1 wk of age onward. In the IS group, litters were separated from the sow for a period of 12 h/d (0930 to 2130), starting 11 d before weaning. Rectal ultrasonography was applied at d 3 after weaning to check the ovaries for follicle development or presence of corpora lutea. Creep feed intake by the litters during lactation was higher in IS litters than in control litters (686 57 vs. 314 +/- 42 g/piglet, P <0.01). The distribution of creep feed intake shifted from a skewed one, with a majority of litters consuming less than 250 g/piglet in control litters, to a normal distribution, with an average creep feed intake of 500 to 750 g/piglet in IS litters. During the 7 d after weaning, creep feed intake in IS litters was also higher (281 +/- 15 vs. 204 +/- 9 g(.)piglet(-1.)d(-1), P <0.01). The ADG of piglets during lactation was negatively affected by IS, resulting in lower weight at weaning (7,229 +/- 140 vs. 7,893 +/- 145 g/piglet, P <0.05). During the 7 d after weaning, however, ADG was higher in IS litters (255 +/- 10 vs. 177 +/- 8 g(.)piglet(-1.)d(-1), P <0.01), and 7 d after weaning, the weights of the litters were similar (9,011 +/- 167 vs. 9,132 +/- 164 g/piglet, P = 0.81). The IS litters that consumed little or no feed during lactation had an ADG after lactation that was higher than in control litters, with comparable creep feed intake during lactation: 204 vs. 136 g/d. Body weight loss by the sows during lactation was lower in IS sows (-10 +/- 2 vs. -16 +/- 1 kg, P <0.05). A higher percentage of IS sows ovulated during lactation (22 vs. 3%, P <0.01), and weaning-to-ovulation interval (excluding sows with lactational ovulation) was shorter in IS sows (4.7 +/- 0.2 vs. 5.3 +/- 0.2 d, P <0.05). We conclude that IS increased creep feed intake during lactation, and that IS increased ADG after weaning, despite lower weaning weights. Ovulation during lactation was induced in 22% of the IS sows.
    Consequences of interrupted suckling for sows and piglets
    Kuller, W.I. ; Beers-Schreurs, H.M.G. van; Soede, N.M. ; Kemp, B. ; Taverne, M.A.M. ; Verheijden, J.H.M. - \ 2002
    In: Proceedings IPVS, Des Moines, USA, 2002 - p. 1 - 1.
    Interrupted suckling: effects on performance of sows and piglets
    Kuller, W.I. ; Beers-Schreurs, H.M.G. van; Soede, N.M. ; Kemp, B. ; Taverne, M.A.M. ; Verheijden, J.H.M. - \ 2001
    In: Sixth International Conference on Pig Reproduction Missouri-Colombia : University of Missouri-Colombia - p. 120 - 120.
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