Publication
Effects of bovine somatotrophin (bST) on ovarian function in post-partum beef cows
| dc.contributor.author | Andrade, L.P. | |
| dc.contributor.author | Rhind, S.M. | |
| dc.contributor.author | Wright, I.A. | |
| dc.contributor.author | McMillen, S.R. | |
| dc.contributor.author | Goddard, P.J. | |
| dc.contributor.author | Bramley, T.A. | |
| dc.date.accessioned | 2013-05-29T15:50:48Z | |
| dc.date.available | 2013-05-29T15:50:48Z | |
| dc.date.issued | 1996 | |
| dc.description | Full text not available. Only the abstract. DOI: 10.1071/RD9960951 | por |
| dc.description.abstract | The effects of bovine somatotrophin (bST) on ovarian follicle development and function and associated gonadotrophin profiles during the first nine weeks post partum were investigated in beef cows. Thirty-two cows (Shorthorn x Galloway) in moderately low body condition (BC) at calving were fed to maintain BC thereafter. At Weeks 2, 4, 6 and 8 post partum, animals were injected with 320 mg bovine somatotrophin (bST) (T, treated; n = 17) or with the carrier oil only (C, control; n = 15). Ovulation occurred in 4 of 17 T cows and 0 of 15 C cows (P = 0.10) by nine week post partum. Treatment with bST did not affect the numbers of small (3-8 mm in diameter) or large (> 8 mm in diameter) follicles or the granulosa cell populations but enhanced the oestradiol (P < 0.05) and insulin-like growth factor-I (IGF-I) content (P < 0.01) of large follicles by nine weeks post partum. It did not significantly affect the testosterone concentrations of large follicles. Circulating concentrations of growth hormone (GH) and IGF-I were higher in T cows than in C cows (P < 0.001) but were unrelated to gonadotrophin profiles or gonadotrophin receptor concentrations in the follicles. At Week 8, plasma insulin concentrations were higher in T cows than in C cows both before (P < 0.05) and after (P < 0.05) glucose injection. It is concluded that GH may play an important role in mediating the effects of nutritional state on ovarian function during the post-partum period, possibly through alteration of intrafollicular IGF-I concentrations. | por |
| dc.identifier.citation | ANDRADE, L.P. [et al.] (1996) - Effects of bovine somatotrophin (bST) on ovarian function in post-partum beef cows. Reproduction, Fertility and Development. 8:6, p. 951-960. | por |
| dc.identifier.uri | http://hdl.handle.net/10400.11/1826 | |
| dc.language.iso | eng | por |
| dc.peerreviewed | yes | por |
| dc.publisher | CSIRO | por |
| dc.relation.publisherversion | http://www.publish.csiro.au/paper/RD9960951 | por |
| dc.subject | Beef cattle | por |
| dc.subject | Ovarian function | por |
| dc.subject | Postpartum | por |
| dc.title | Effects of bovine somatotrophin (bST) on ovarian function in post-partum beef cows | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 960 | por |
| oaire.citation.startPage | 951 | por |
| oaire.citation.title | Reproduction, fertility and Development | por |
| person.familyName | Mota Pinto de Andrade | |
| person.givenName | Luís Pedro | |
| person.identifier.ciencia-id | DA1F-0C25-23F1 | |
| person.identifier.orcid | 0000-0002-9206-2350 | |
| rcaap.rights | openAccess | por |
| rcaap.type | article | por |
| relation.isAuthorOfPublication | 2bb821ef-7e5a-4a7a-9064-45b5fc394432 | |
| relation.isAuthorOfPublication.latestForDiscovery | 2bb821ef-7e5a-4a7a-9064-45b5fc394432 |