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dc.contributor.authorSmith, JFen_US
dc.contributor.authorSoboleva, TKen_US
dc.contributor.authorPeterson, AJen_US
dc.contributor.authorPleasants, Ten_US
dc.contributor.authorChagas, LMen_US
dc.contributor.authorBurke, CRen_US
dc.coverage.spatialChristchurch, New Zealanden_US
dc.date.available2005-01-01en_US
dc.date.issued2005-01-01en_US
dc.identifier.citationProceedings of the New Zealand Society of Animal Production, 2005, (65), pp. 324 - 328 (5)en_US
dc.description.abstractPostpartum anoestrus is a major reproductive problem in New Zealand dairy cows and its duration is related to the nutrition levels both pre and post calving. However, the mechanistic details of this relationship are largely unknown. A better understanding of the interactions between nutritional status, and the levels of the reproductive hormones controlling follicle development and ovulation is needed. A mathematical model consisting of a set of interactive nonlinear differential equations and describing the dynamics of the interactions among luteinising hormone (LH), follicle stimulating hormone (FSH) and oestradiol was developed. The model depicts oestradiol profiles generated by individual follicles from the first follicular wave after calving until ovulation, and changes in LH pulsatility leading to the first pre-ovulatory surge are also produced. The robustness of the model was ascertained from iterative processes, and it was also checked against existing experimental data so as to mimic observed changes in hormone levels. It was shown that two mathematical parameters which control: i) the speed of changes in the feedback of LH activity to oestradiol; and, ii) the sensitivity of the ovarian response to LH, have the greatest effect on duration of anoestrus.en_US
dc.format.extent324 - 328 (5)en_US
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
dc.sourceNew Zealand Society of Animal Production Conferenceen_US
dc.subjectmathematical modelen_US
dc.subjectanoestrusen_US
dc.subjectdairy cowsen_US
dc.subjectnutritionen_US
dc.subjectoestradiolen_US
dc.subjectLHen_US
dc.subjectFSHen_US
dc.titleMathematical modelling of anoestrus in dairy cows and the linkage to nutritionen_US
dc.typeConference Paper
dc.description.confidentialfalseen_US
dc.identifier.elements-id281201
dc.relation.isPartOfProceedings of the New Zealand Society of Animal Productionen_US
dc.citation.issue65en_US
dc.description.publication-statusPublisheden_US
pubs.organisational-group/Massey University
pubs.organisational-group/Massey University/College of Sciences
pubs.organisational-group/Massey University/College of Sciences/Institute of Vet, Animal & Biomed Science
dc.identifier.harvestedMassey_Dark
pubs.notesNot knownen_US
dc.subject.anzsrc0702 Animal Productionen_US


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