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Luteinizing hormone concentrations in mares foaling in thin body condition and fed a fat-supplemented diet
| dc.creator | Hagstrom, Debra Jean | |
| dc.date.accessioned | 2012-06-07T22:55:53Z | |
| dc.date.available | 2012-06-07T22:55:53Z | |
| dc.date.created | 1999 | |
| dc.date.issued | 1999 | |
| dc.identifier.uri | https://hdl.handle.net/1969.1/ETD-TAMU-1999-THESIS-H34 | |
| dc.description | Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item. | en |
| dc.description | Includes bibliographical references (leaves 63-75). | en |
| dc.description | Issued also on microfiche from Lange Micrographics. | en |
| dc.description.abstract | Twenty-seven mares with body condition scores (BCS) of = 4.0 were stratified by expected foaling date and age, and assigned to one of three treatment groups. The control-thin (T) group was fed a conventional diet to maintain its initial BCS. Control-gain (C) mares were fed the same diet to gain 12% of their body weight by 90d postpartum. The FS group was fed to gain at the same rate as C on a l 2% fat-supplemented concentrate. The hypothesis that fat-supplementation would elevate serum LH concentrations and improve reproductive performance was tested. Days to first ovulation (FOV) and cycles per conception (CPC) were not different among groups (P > . 10). Days to conception (DTC) were greater in FS mares as compared to C mares (P < .05). This significance may be due to several BCS factors more so than being a result of diet. Pregnancy rates were different (P < .10), with FS mares having a higher pregnancy rate than both C and T. Areas under the curves (AUC) and LH peak (PK) concentrations for the first (FST) and fertile (FER) postpartum ovulation were not different among treatment groups (P > .10,. P > .15, respectively). A trend was observed towards FS mares having higher FSTPK concentrations as compared to C mares (P =.21). Additionally, FS mares tended to have larger FERAUC's than both C (P = .12) and T (P = . 18) groups, and larger FERPK'S than C mares (P =.11). Several weak trends were seen especially when treatments were separated into the age groups, young (< 10 y) and old (= 10 y). In conclusion, fat supplementation of mares foaling in thin BCS did not appear to produce significant changes in amplitude or magnitude of LH concentrations (P > . 15), d to FOV (P > .35), or CPC (P > .55). Fat-supplemented mares had significantly higher pregnancy rates (P < .10). Days to conception was also greater in FS mares as compared to C mares (P < .05). However, due to several confounding errors in protocol and execution of the treatments these differences can not be attributed solely to effects of fat- supplementation. | en |
| dc.format.medium | electronic | en |
| dc.format.mimetype | application/pdf | |
| dc.language.iso | en_US | |
| dc.publisher | Texas A&M University | |
| dc.rights | This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. | en |
| dc.subject | physiology of reproduction. | en |
| dc.subject | Major physiology of reproduction. | en |
| dc.title | Luteinizing hormone concentrations in mares foaling in thin body condition and fed a fat-supplemented diet | en |
| dc.type | Thesis | en |
| thesis.degree.discipline | physiology of reproduction | en |
| thesis.degree.name | M.S. | en |
| thesis.degree.level | Masters | en |
| dc.type.genre | thesis | en |
| dc.type.material | text | en |
| dc.format.digitalOrigin | reformatted digital | en |
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