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dc.contributor.authorCrowe, M. A.
dc.contributor.authorDiskin, M. G.
dc.contributor.authorWilliams, E. J.
dc.date.accessioned2018-09-20T16:04:27Z
dc.date.available2018-09-20T16:04:27Z
dc.date.issued2014-03-28
dc.identifier.citationCrowe, M. A. Diskin, M. G.; Williams, E. J. (2014). Parturition to resumption of ovarian cyclicity: comparative aspects of beef and dairy cows. animal 8 , 40-53
dc.identifier.issn1751-7311,1751-732X
dc.identifier.urihttp://hdl.handle.net/10379/10961
dc.description.abstractThere is a variable anoestrous period following parturition in the cow. Follicular growth generally resumes within 7 to 10 days in the majority of cows associated with a transient FSH rise that occurs within 3 to 5 days of parturition. Dairy cows that are not nutritionally stressed generally ovulate their first postpartum dominant follicle (similar to 15 days), whereas beef suckler cows in good body condition normally have a mean of 3.2 +/- 0.2 dominant follicles (similar to 30 days) to first ovulation; moreover, beef cows in poor body condition have a mean of 10.6 +/- 1.2 dominant follicles (similar to 70 to 100 days) to first ovulation. The lack of ovulation of dominant follicles during the postpartum period is associated with infrequent LH pulses, with both maternal-offspring bonding and low body condition score (BCS) at calving being implicated as the predominant causes of delayed resumption of cyclicity in nursed beef cows. In dairy cows, the normal pattern of early resumption of ovulation may be delayed in high-yielding Holstein type cows generally owing to the effects of severe negative energy balance, dystocia, retained placental membranes and uterine infections. First ovulation, in both dairy and beef cows, is generally silent (i.e., no behavioural oestrus) and followed by a short inter-ovulatory interval (>70%). The key to optimizing the resumption of ovulation in both beef and dairy cows is appropriate pre-calving nutrition and management so that cows calve down in optimal body condition (BCS; 2.75 to 3.0) with postpartum body condition loss restricted to <0.5 BCS units.
dc.publisherCambridge University Press (CUP)
dc.relation.ispartofanimal
dc.subjectresumption of oestrous cycles
dc.subjectuterine health
dc.subjectovary
dc.subjectbeef cows
dc.subjectdairy cows
dc.subjectgonadotropin-releasing-hormone
dc.subjectgrowth-factor-i
dc.subjectventricular cerebrospinal-fluid
dc.subjectfollicle-stimulating-hormone
dc.subjectsuckling-mediated inhibition
dc.subjectnonesterified fatty-acids
dc.subject1st postpartum ovulation
dc.subjectdietary energy-source
dc.subjectluteinizing-hormone
dc.subjectestrous-cycle
dc.titleParturition to resumption of ovarian cyclicity: comparative aspects of beef and dairy cows
dc.typeArticle
dc.identifier.doi10.1017/s1751731114000251
dc.local.publishedsourcehttps://www.cambridge.org/core/services/aop-cambridge-core/content/view/C4279FF8209F1E8493A2D05CFFC31C3C/S1751731114000251a.pdf/div-class-title-parturition-to-resumption-of-ovarian-cyclicity-comparative-aspects-of-beef-and-dairy-cows-div.pdf
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