Title

Gluconeogenic capacity and energy balance in grazing dairy cows treated with a low dose of recombinant bovine somatotropin in transition period

DOI

https://doi.org/10.4067/s0301-732x2014000200019

Document Type

Article

Publication Date

1-1-2014

Publication Title

Archivos de Medicina Veterinaria

Abstract

The aim of the study was to establish the low dose effect (250 mg/cow) of recombinant bovine somatotropin (rbST) in grazing dairy cows during the transition period on energy-protein balance parameters and gluconeogenic capacity. 3 assays were conducted: Prepartum, 10 prepartum cows were used: bST group (bST, n = 5), single dose of rbST on the 26 day (d) prepartum, and control (n = 5); blood samples and body condition score (BCS) were obtained every 3d from 26 d to 6 d prepartum. Pospartum, 10 postpartum cows were used: bST group (n = 5), single dose of rbST on the 6 d postpartum, and control (n = 5); blood samples, body weight (BW), BCS and milk production were obtained and recorded every 3 days from 6 d to 27 d postpartum. Transition, 14 prepartum cows were used: bST group (n = 7), treated with rbST every 14 days from 21 d prepartum to 7 d postpartum, and control (n = 7); blood samples, BW and BCS score were obtained every 3 days from 21 d prepartum to 7 d postpartum; additionally, a propionate loading test was performed (bST, n = 4; control, n = 4) on the 9 d postpartum to assess conversion of propionate to glucose. In all the assays, energy and protein plasma concentration were determined. The treatment of grazing dairy cows with a single dose of rbST in prepartum did not change the energy balance, while in early postpartum it increased milk production without a detrimental effect on energy balance. Propionate to glucose conversion in early postpartum was not affected by the prepartum administration of rbST. th th th th th th th th th th th

Volume

46

Issue

2

First Page

321

Last Page

326

ISSN

0301732X

Identifier

SCOPUS_ID:84907899581

Documento original

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