Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/12431
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dc.contributor.authorNguyen , Xuan Trachen
dc.contributor.authorHinch, Geoffreyen
dc.date.accessioned2013-04-11T17:33:00Z-
dc.date.created1996en
dc.date.issued1997-
dc.identifier.urihttps://hdl.handle.net/1959.11/12431-
dc.description.abstractThis thesis examines factors influencing responses to artificial manipulation of oestrous and ovulation in post-partum beef cows. To serve as background two main chapters are devoted to reviewing the literature on the physiology of important reproductive processes related to the oestrous cycle and the post-partum period and on methods for inducing and synchronising oestrus and ovulation in female cattle. The experimental chapter reports three field trials which were carried out on two pasture-based seasonally calving beef enterprises. These experiments examined the efficacy of several drug regimes, the influence of nutritional status and reproductive state of animals and the effect of protected lipid supplementation on reproductive responses to oestrous synchronisation. It was found that the Crestar (progestogen plus oestrogen) produced better reproductive responses than the CIDR-B (progesterone plus oestrogen) in nutritionally deprived post-partum suckled beef cows. Short term (7-9 day) CIDR-B (without oestrogen) in combination with PMSG and prostaglandin can result in acceptable responses under favourable nutritional circumstances. However, this was dependent on AI occurring at detected oestrus since neither progesterone alone nor progesterone-oestrogen combination in the present treatments completely suppressed the effect of follicular wave development on the synchrony of responses. When a second CIDR-B treatment was applied beginning two weeks following the first AI, overall pregnancy rate to both cycles of AI was increased significantly. A low dose of PMSG (450 i.u.) proved to be suitable for cycling cows while a higher dose (550 i.u.) was good for non-cycling cows. The cycling state seemed to influence only the expression of behavioural oestrus but not pregnancy rates in the present treatments which were initiated after one month post-partum. The post-partum interval from calving to treatment commenced after one month post-partum had no significant effect on the response, but long term nutritional status, as reflected by pasture conditions and body condition, was of significance in determining the level of responses. A short term feeding of a protected supplement showed potential for increasing responses to oestrous synchronisation in post-partum suckled beef cows.en
dc.languageenen
dc.titleArtificial Manipulation of Oestrus and Ovulation in Post-Partum Beef Cattleen
dc.typeThesis Masters Researchen
dcterms.accessRightsUNE Greenen
local.contributor.firstnameXuan Trachen
local.contributor.firstnameGeoffreyen
dcterms.RightsStatementCopyright 1996 - Xuan Trach Nguyenen
dc.date.conferred1997en
local.thesis.degreelevelMasters researchen
local.thesis.degreenameMaster of Scienceen
local.contributor.grantorUniversity of New Englanden
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailghinch@une.edu.auen
local.output.categoryT1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordvtls008584125en
local.access.fulltextYesen
local.contributor.lastnameNguyenen
local.contributor.lastnameHinchen
dc.identifier.staffune-id:ghinchen
local.profile.orcid0000-0003-4731-865Xen
local.profile.roleauthoren
local.profile.rolesupervisoren
local.identifier.unepublicationidune:12638en
dc.identifier.academiclevelAcademicen
local.title.maintitleArtificial Manipulation of Oestrus and Ovulation in Post-Partum Beef Cattleen
local.output.categorydescriptionT1 Thesis - Masters Degree by Researchen
local.thesis.borndigitalnoen
local.search.authorNguyen , Xuan Trachen
local.search.supervisorHinch, Geoffreyen
local.open.fileurlhttps://rune.une.edu.au/web/retrieve/2320ceba-2af8-41bb-a9e6-cac308d31d10en
local.open.fileurlhttps://rune.une.edu.au/web/retrieve/07a998dd-5376-40d6-999a-b82f54a2f16cen
local.open.fileurlhttps://rune.une.edu.au/web/retrieve/c50b633a-8dec-4a99-8a36-ad2643014b14en
local.uneassociationYesen
local.year.conferred1997en
local.fileurl.openhttps://rune.une.edu.au/web/retrieve/07a998dd-5376-40d6-999a-b82f54a2f16cen
local.fileurl.openhttps://rune.une.edu.au/web/retrieve/2320ceba-2af8-41bb-a9e6-cac308d31d10en
local.fileurl.openhttps://rune.une.edu.au/web/retrieve/c50b633a-8dec-4a99-8a36-ad2643014b14en
Appears in Collections:School of Environmental and Rural Science
Thesis Masters Research
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