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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    We will mail you new results for this query: keywords==calving interval
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Nieuwe maat voor melkproductie : vergelijking melkgift koeien met verschillende droogstandslengte mogelijk met effectieve lactatie
Kok, A. ; Knegsel, A.T.M. van; Middelaar, C.E. van - \ 2016
Veeteelt 33 (2016)7. - ISSN 0168-7565 - p. 44 - 45.
dairy cattle - dairy farming - milk production - lactation - dry period - calving interval - agricultural research - melkvee - melkveehouderij - melkproductie - lactatie - gustperiode - tussenkalftijd - landbouwkundig onderzoek
De gebruikelijke maat voor lactatieproductie, de 305 dagenproductie, houdt geen rekening met de lengte van de droogstand of tussenkalftijd van de koe. Onderzoekers van Wageningen UR stellen daarom een nieuwe maat voor lactatieproductie voor
'De koe in de watten leggen' : Maria Verduin verzorgt droogstaande en verse koeien in kraamhotel'
Hulst, M. van der - \ 2009
Nieuwe Oogst / Magazine Veehouderij 5 (2009)21. - ISSN 1871-0948 - p. 4 - 4.
rundveehouderij - gustperiode - tussenkalftijd - lactatie - kalven - afkalfpercentage - cattle husbandry - dry period - calving interval - lactation - calving - calving rate
Maria Verduin, veehouder in Koudum runt sinds 2008 een kraamhotel
'In een kraamhotel krijgen verse koeien alle aandacht'
Hulst, M. van der - \ 2007
Nieuwe Oogst / Magazine Veehouderij 3 (2007)23. - ISSN 1871-0948 - p. 21 - 21.
melkveehouderij - melkvee - gustperiode - tussenkalftijd - lactatie - huisvesting van rundvee - dairy farming - dairy cattle - dry period - calving interval - lactation - cattle housing
Het netwerk 'Kraamhotel', van het programma Netwerken in de Veehouderij van de Animal Sciences Group (ASG), gaat de mogelijkheden na om droogstaande en verse koeien in een apart bedrijf onder te brengen
Genetics and genomics to improve fertility in high producing dairy cows
Veerkamp, R.F. ; Beerda, B. - \ 2007
Theriogenology 68 (2007)suppl. 1. - ISSN 0093-691X - p. S266 - S273.
body condition score - quantitative trait loci - linear type traits - milk-production - energy-balance - random regression - herd environment - calving interval - holstein cattle - luteal activity
Improving dairy cow fertility by means of genetic selection is likely to become increasingly important, since it is now well established that declining fertility cannot only be arrested by improved management. Profit margins per kg milk produced are decreasing, therefore farmers need to reduce cost and increase herd size. This restricts the labor input per cow and the disposable cost of getting a cow pregnant, whilst at the same time hormone treatments have become less acceptable. This makes it unlikely that additional management interventions will maintain fertility at acceptable levels in the near future. Genetic improvement seems the obvious solution. Effective selection tools are available in most Western countries using traditional breeding value estimation procedures. Also, in addition to gene assisted selection using individual genes or QTL, high throughput Single Nucleotide Polymorphism (SNP) technology allows genetic improvement of fertility based on information from the whole genome (tens of thousands SNP per animal), i.e. genomic selection. Simulation studies have shown that genomic selection improves the accuracy of selecting juvenile animals compared with traditional breeding methods and compared with selection using information from a few genes or QTL only. Research in the areas genomics and proteomics promise to make genetic selection even more effective. The genomic and proteomics technologies combined with the bioinformatics tools that support the interpretation of gene functioning and protein expression facilitate an exciting starting point for the development of new management strategies and tools for the improvement of reproductive performance.
Converting to organic dairy farming: Consequences for production, somatic cell scores and calving interval of first parity Holstein cows
Nauta, W.J. ; Baars, T. ; Bovenhuis, H. - \ 2006
Livestock Science 99 (2006)2-3. - ISSN 1871-1413 - p. 185 - 195.
conversie - biologische landbouw - melkproductie - tussenkalftijd - leeftijd bij eerste keer kalven - celgetal - conversion - organic farming - milk production - calving interval - age at first calving - somatic cell count - health - herds - milk
This paper aims to describe the changes prompted by conversion to organic farming for milk production and fertility of first parity Holstein cows. Data was collected for Dutch organic farms, with a distinction made between long-standing-organic farms, converted organic farms and a reference group of conventional farms. The percentage Holstein blood in the herds, milk production (kg milk, % milk fat, % milk protein), somatic cell scores (SCS), calving interval (CI) and age at first calving (AFC) were described over time. An animal model was used to estimate the effects of conversion on different traits based on data from converted organic farms. Milk production was lower and somatic cell counts were higher on long-standing-organic farms than on conventional and converted organic farms. Interestingly, at pre-organic farms, i.e. before their conversion, the milk production level was already lower than at conventional farms. The estimates from our statistical analysis showed a highly significant decrease in milk yield and protein percentage due to conversion. Also fat content decreased, SCS increased and AFC increased significantly. It can be concluded that the conversion to organic farming is a gradual process over years. Dutch farmers who decided during the late 1990s to convert to organic farming, represented a specific group of farmers distinct from conventional farmers, which was reflected by lower milk yields, milk fat percentage and protein percentage before conversion as compared to conventional farms. During conversion, significant changes in milk production, protein and fat contents and somatic cell scores took place. Age of first calving is an important difference between organic and conventional farming
Elk jaar een kalf blijft optimaal
Hogeveen, H. ; Eerdenburg, F. van; Cocq, P. de - \ 2005
Veeteelt 22 (2005)21. - ISSN 0168-7565 - p. 12 - 14.
melkveehouderij - melkkoeien - melkproductie - tussenkalftijd - lactatie - lactatieduur - economische analyse - kunstmatige inseminatie - timing - agrarische bedrijfsvoering - bedrijfsresultaten in de landbouw - dairy farming - dairy cows - milk production - calving interval - lactation - lactation duration - economic analysis - artificial insemination - farm management - farm results
Met het oog op het vinden van de optimale tussenkalftijd zochten onderzoekers aan de faculteit Diergeneeskunde Utrecht naar het optimale lactatiestadium om koeien te insemineren
Genetic relationships among linear type traits, milk yield, body weight, fertility and somatic cell count in primiparous dairy cows
Berry, D.P. ; Buckley, F. ; Dillon, P.P. ; Evans, R.D. ; Veerkamp, R.F. - \ 2004
Irish Journal of Agricultural and Food Research 43 (2004)2. - ISSN 0791-6833 - p. 161 - 176.
1st lactation holsteins - condition score - clinical mastitis - conformation traits - selection criterion - udder conformation - management traits - calving interval - new-zealand - cattle
Phenotypic and genetic (co)variances among type traits, milk yield, body weight, fertility and somatic cell count were estimated. The data analysed included 3,058 primiparous spring-calving Holstein-Friesian cows from 80 farms throughout the south of Ireland. Heritability estimates for the type traits varied from 0.11 to 0.43. Genetic correlations among some type traits were very strong and may indicate the possibility of reducing the number of traits assessed on each animal; the genetic correlation between angularity and body condition score was -0.84. Genetic correlations between all type traits (except body condition score, udder depth and teat length) and milk yield were positive and ranged from 0.08 to 0.69. The possibility of selecting for body weight may be achievable within a national progeny-testing programme using type traits within a selection index. Moderate to strong genetic correlations existed between some type traits and the various fertility measures and somatic cell count indicating the opportunity of indirect selection for improved fertility and health of animals using type traits within a selection index; however, the standard errors of some of the genetic correlations were large and should thus be treated with caution. Genetically taller, wider, deeper, more angular cows with tighter, stronger, shallower udders were predisposed to have inferior pregnancy rates to first service and require more services.
A resource allocation model describing consequences of artificial selection under metabolic stress
Waaij, E.H. van der - \ 2004
Journal of Animal Science 82 (2004)4. - ISSN 0021-8812 - p. 973 - 981.
body condition score - long-term selection - dairy-cattle - calving interval - genetic-relationship - energy-balance - linear type - traits - responses - performance
Long-term selection on production results in increased environmental sensitivity. This often is expressed through decreased fertility and increased health problems. The phenomenon has been described in all common farm animal species. One theory is that potential resource intake is insufficient to express production potential. Additional resources are drawn away from fitness-related traits, such as fertility and health, to further increase observed production. In addition, resources for maintaining fitness depend on the demands by the environment. In a harsh environment, more resources are required for fitness-related traits than in an optimal environment. Literature results show that selection in an optimal environment will increase sensitivity to less optimal environments. The objectives of this paper were to increase understanding of the underlying mechanism behind the development of environmental sensitivity and to gain insight into correlated response(s) when selection is on observed production. A resource allocation model was defined where observed production depended on production potential, resource intake potential, and the allocation of resources to production or fitness, including maintenance, health, and reproduction. Penalties for reproductive performance and probability of survival were included when the proportion of resources assigned to fitness dropped below a certain, environment-related, threshold. Mass selection was practiced on observed production during 40 generations using stochastic simulation. Depending on the heritabilities of the underlying components and on the environment, selection on observed production resulted in a decrease in reproductive rate and in the development of environmental sensitivity when resource intake becomes limiting. Correlations of observed production with underlying components changed across generations, following a nonlinear pattern. The proposed model is simple, but increases the understanding of underlying mechanisms and consequences of selection for production when resources are limiting.
Genetic relationships among Body condition score, Body weight, Milk yield and Fertility in Dairy Cows
Berry, D.P. ; Buckley, F. ; Dillon, P. ; Evans, R.D. ; Rath, M. ; Veerkamp, R.F. - \ 2003
Journal of Dairy Science 86 (2003)6. - ISSN 0022-0302 - p. 2193 - 2204.
linear type traits - reproductive-performance - calving interval - breeding objectives - female fertility - luteal activity - energy-balance - holstein cows - feed-intake - cattle
Genetic (co)variances between body condition score (BCS), body weight (BW), milk production, and fertility-related traits were estimated. The data analyzed included 8591 multiparous Holstein-Friesian cows with records for BCS, BW, milk production, and/or fertility from 78 seasonal calving grass-based farms throughout southern Ireland. Of the cows included in the analysis, 4402 had repeated records across the 2 yr of the study. Genetic correlations between level of BCS at different stages of lactation and total lactation milk production were negative (-0.51 to -0.14). Genetic correlations between BW at different stages of lactation and total lactation milk production were all close to zero but became positive (0.01 to 0.39) after adjusting BW for differences in BCS. Body condition score at different stages of lactation correlated favorably with improved fertility; genetic correlations between BCS and pregnant 63 d after the start of breeding season ranged from 0.29 to 0.42. Both BW at different stages of lactation and milk production tended to exhibit negative genetic correlations with pregnant to first service and pregnant 63 d after the start of the breeding season and positive genetic correlations with number of services and the interval from first service to conception. Selection indexes investigated illustrate the possibility of continued selection for increased milk production without any deleterious effects on fertility or average BCS, albeit, genetic merit for milk production would increase at a slower rate
Genetic Parameters for Body condition score, Body weigth, Milk yield and Fertility estimated using random regression models
Berry, D.P. ; Buckley, F. ; Dillon, P. ; Evans, R.D. ; Rath, M. ; Veerkamp, R.F. - \ 2003
Journal of Dairy Science 86 (2003)11. - ISSN 0022-0302 - p. 3704 - 3717.
friesian dairy-cattle - linear type traits - energy-balance - reproductive-performance - covariance functions - live weight - calving interval - luteal activity - feed-intake - cows
Genetic (co)variances between body condition score (BCS), body weight (BW), milk yield, and fertility were estimated using a random regression animal model extended to multivariate analysis. The data analyzed included 81,313 BCS observations, 91,937 BW observations, and 100,458 milk test-day yields from 8725 multiparous Holstein-Friesian cows. A cubic random regression was sufficient to model the changing genetic variances for BCS, BW, and milk across different days in milk. The genetic correlations between BCS and fertility changed little over the lactation; genetic correlations between BCS and interval to first service and between BCS and pregnancy rate to first service varied from -0.47 to -0.31, and from 0.15 to 0.38, respectively. This suggests that maximum genetic gain in fertility from indirect selection on BCS should be based on measurements taken in midlactation when the genetic variance for BCS is largest. Selection for increased BW resulted in shorter intervals to first service, but more services and poorer pregnancy rates; genetic correlations between BW and pregnancy rate to first service varied from -0.52 to -0.45. Genetic selection for higher lactation milk yield alone through selection on increased milk yield in early lactation is likely to have a more deleterious effect on genetic merit for fertility than selection on higher milk yield in late lactation
Vruchtbaarheid op het High-techbedrijf redelijk tot goed
Thomassen, I. ; Kamp, A. van der - \ 2002
Praktijkkompas. Rundvee 16 (2002)3. - ISSN 1570-8586 - p. 26 - 27.
vruchtbaarheid - tussenkalftijd - zwangerschap - zwangerschapspercentage - bevruchtingspercentage - afkalfpercentage - melkkoeien - melkvee - melkveehouderij - diergezondheid - voortplantingsstoornissen - inseminatie - kunstmatige inseminatie - proefbedrijven - demonstratiebedrijven, landbouw - fertility - calving interval - pregnancy - pregnancy rate - conception rate - calving rate - dairy cows - dairy cattle - dairy farming - animal health - reproductive disorders - insemination - artificial insemination - pilot farms - demonstration farms
In een reeks van vier artikelen bespreken we het diermanagement op het High-techbedrijf. Dit artikel gaat in op de vruchtbaarheid.
Tegenvallende drachtigheid veestapel lagekostenbedrijf
Ouweltjes, W. ; Haan, M. de; Remmelink, G. - \ 2001
Rundvee praktijkonderzoek 14 (2001)3. - ISSN 1569-805X - p. 13 - 15.
zwangerschap - zwangerschapspercentage - vruchtbaarheid - vrouwelijke vruchtbaarheid - tussenkalftijd - lichaamsconditie - melkkoeien - melkveehouderij - diervoedering - veevoeding - concentraten - krachtvoeding - mineraaltekorten - mineralen - mineralenvoeding - pregnancy - pregnancy rate - fertility - female fertility - calving interval - body condition - dairy cows - dairy farming - animal feeding - livestock feeding - concentrates - force feeding - mineral deficiencies - minerals - mineral nutrition
Dit artikel gaat in op de vruchtbaarheid en de conditie van de dieren.
Minder melkziekte en melkgeld met doormelken
Ouweltjes, W. ; Sampinon, O. ; Sol, J. - \ 2000
Praktijkonderzoek Rundvee, Schapen en Paarden. Praktijkonderzoek 13 (2000)2. - ISSN 1386-8470 - p. 9 - 11.
melkveehouderij - melkvee - melken - tussenkalftijd - lactatie - melksecretie - melkziekte - uiers - kalveren - colostrum - dairy farming - dairy cattle - milking - calving interval - lactation - milk secretion - parturient paresis - udders - calves
Koeien die worden doorgemolken hebben in de volgende lactatie een beduidend lagere melkproductie. Ook de productie van kg vet en eiwit was fors lager. De koeien hadden veel minder melkziekte.
Bronstregulatie bij langdurig guste zeugen
Binnendijk, G. ; Hoofs, A. - \ 1998
Praktijkonderzoek varkenshouderij 12 (1998)1. - ISSN 1382-0346 - p. 2 - 3.
oestrus - zeugen - tussenkalftijd - sows - calving interval
In de eerste weken na opheffing van het fokverbod zijn op praktijkbedrijven de zeugen die spontaan in bronst kwamen geonsemineerd. Bij de nog guste zeugen kan de bronst gereguleerd worden om het geplande aantal dekkingen per week te realiseren.
Hoe verder na beeindiging van het fokverbod?
Vesseur, P. - \ 1997
Praktijkonderzoek varkenshouderij 11 (1997)6. - ISSN 1382-0346 - p. 5 - 7.
veredelingsmethoden - zeugen - tussenkalftijd - landbouwbedrijven - bedrijfssystemen - overheidsbeleid - landbouwbeleid - agrarisch recht - nederland - breeding methods - sows - calving interval - farms - farming systems - government policy - agricultural policy - agricultural law - netherlands
In de gebieden waar het fokverbod geldt staan op dit moment alle zeugen gust. Er is weinig bekend over hoe het verder zal gaan met die zeugen. Toch is het goed er tijdig bij stil te staan. Wat is de verwachting op theoretische basis en hoe kan daarop worden ingespeeld?
Stappentellers als hulpmiddel
Maatje, K. ; Loeffler, S.H. ; Engel, B. - \ 1997
Veeteelt (1997). - ISSN 0168-7565 - p. 840 - 842.
oestrus - melkvee - melkveehouderij - tussenkalftijd - meting - schatting - registreren - gegevens verzamelen - kunstmatige inseminatie - dairy cattle - dairy farming - calving interval - measurement - estimation - recording - data collection - artificial insemination
Een proef is uitgevoerd om het effect van het tijdstip van insemineren op het bevruchtingsresultaat te meten. Hierbij is gebruik gemaakt van stappentellers
Genetic aspects of intervals from weaning to estrus in swine
Napel, J. ten - \ 1996
Agricultural University. Promotor(en): E.W. Brascamp, co-promotor(en): J.K. Oldenbroek. - S.l. : Ten Napel - ISBN 9789054856009 - 165
tussenkalftijd - varkens - spenen - oestrus - calving interval - pigs - weaning
<br/>Genetic variation in interval from weaning to estrus, and genetic relationships with traits commonly under selection were studied using data from an eight-generation selection experiment on a short interval from weaning to estrus, and data from an American breeding company. From the biological background and the distribution of data it appears that interval from weaning to estrus is either normal or prolonged. Selection for a short interval reduced the average interval by reducing the incidence of prolonged intervals only. Sows on units of the breeding company studied with a prolonged interval had consistently more favorable estimated breeding values for backfat and growth rate, than sows with a normal interval. Analysis of data from the selection experiment did not confirm this. Model studies showed that extending the number of traits under selection with a 0/1 trait, representing normal and prolonged intervals, gives the highest response ineach of the traits under selection.
Invloed van de tijdsduur tussen inseminatie en ovulatie op de produktie van zeugen
Vesseur, P.C. ; Binnendijk, G.P. ; Soede, N.M. - \ 1995
Rosmalen : Praktijkonderzoek varkenshouderij (Proefverslag / Praktijkonderzoek Varkenshouderij P1.135) - 16
kunstmatige inseminatie - tussenkalftijd - vruchtbaarheid - zeugen - artificial insemination - calving interval - fertility - sows
'Low-input' schapen
Boer, J. de; Schans, F.C. van der - \ 1995
Praktijkonderzoek / Praktijkonderzoek Rundvee, Schapen en Paarden (PR), Waiboerhoeve 8 (1995)5. - ISSN 0921-8874 - p. 1 - 3.
dierhouderij - geboorte - veredelingsmethoden - tussenkalftijd - ontwikkeling - embryotransplantatie - ooien - groei - eiceltransplantatie - zwangerschap - productiviteit - rentabiliteit - animal husbandry - birth - breeding methods - calving interval - development - embryo transfer - ewes - growth - ova transfer - pregnancy - productivity - profitability
Op het Low Input Schapenbedrijf van de Waiboerhoeve ligt het dek- en aflamseizoen enkele maanden later dan op de traditionele schapenbedrijven.
Jonge Swifter ooien voor dekken scheren geeft hogere drachtigheid
Boer, J. de - \ 1994
Praktijkonderzoek / Praktijkonderzoek Rundvee, Schapen en Paarden (PR), Waiboerhoeve 7 (1994)4. - ISSN 0921-8874 - p. 25 - 27.
dierhouderij - veredelingsmethoden - tussenkalftijd - kettingen - embryotransplantatie - ooien - eiceltransplantatie - zwangerschap - productiviteit - rentabiliteit - vastleggen - animal husbandry - breeding methods - calving interval - chains - embryo transfer - ewes - ova transfer - pregnancy - productivity - profitability - tethering
De conclusie was dat de drachtigheid bij de jonge Swifter ooien toenam met 14% bij scheren voor het dekken. Bij Texelaars zijn dergelijke resultaten niet gevonden.
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