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Old 06-14-2018, 05:56 AM
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rss IGF - Effect of bovine somatotropin injection in late pregnant Holstein heifers on me

Related Articles Effect of bovine somatotropin injection in late pregnant Holstein heifers on metabolic parameters and steroidogenic potential of the first postpartum dominant follicle.

Theriogenology. 2017 Dec;104:164-172

Authors: Acosta DAV, Schneider A, Jacometo CB, Rincon JA, Cardoso F, Corręa MN

Abstract
The aim of this study was to determine the effect of pre-partum injections of bovine somatotropin (bST) in dairy heifers on metabolic markers and the steroidogenic potential of the first postpartum dominant follicle. Heifers were assigned to two groups: bST (ST; n.=.29), that received two doses of bST (500 mg/dose) at.-28 and.-14 days relative to calving; and control (CTL; n.=.30), that did not received bST. Follicular development was monitored via ultrasound every 3 days starting at 8 days in milk (DIM) in a subset of 20 heifers until the day the first large follicle reached a diameter of 16.mm. From these cows follicular fluid was aspirated and the follicular cells recovered (ST; n.=.8 and CTL; n.=.10). Blood samples were collected weekly for all heifers. Follicular fluid IGF-I concentrations of the first postpartum dominant follicle was higher (P.=.0.05) in ST (87.1.±.7.7.mg/mL) than CTL cows (64.3.±.6.8.mg/mL). Also, E2 concentration in the follicular fluid was higher (P.=.0.02) for ST (199.7.±.55.9.ng/mL) than CTL cows (74.5.±.37.7.ng/mL). The expression of LHCGR and STAR mRNA in follicular cells was higher (P..0.05). Serum IGF-I concentration was higher in ST treated heifers during the pre-partum period (P.=.0.01) and no difference was observed in the postpartum period (P.=.0.19). In conclusion, pre-partum bST treatment in dairy heifers increased intrafollicular IGF-I and expression of LHCGR and STAR mRNA in follicular cells of the first postpartum dominant follicle. These changes were associated to increased intrafollicular and serum E2 concentration, which can potentially increase the chance of ovulation of the first follicular wave.


PMID: 28863349 [PubMed - indexed for MEDLINE]



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