Title

Milk production and energy indicators in semi-housed dairy cows treated with low doses of recombinant bovine somatotropin during transition period

Document Type

Article

Publication Date

1-1-2014

Publication Title

Revista Cientifica de la Facultad de Ciencias Veterinarias de la Universidad del Zulia

Abstract

The aim of this study was to determine the effect of low doses of recombinant bovine somatotropin (rbST) on energy balance parameters and milk production in transition dairy cows on a semi-housed system. Seventy two Holstein-Frisian cows were used and allotted in: treatment group (rbST, n=36), treated from 3 prepartum to 6 pospartum week with 250 mg/14 days (d) of bST and control group (C, n=36), not treated. Blood samples were obtained during rbST treatment from both groups to determine non esterified fatty acids (NEFA), ·-h- ydroxybutyrate (-HBA), cholesterol, urea and albumin concentrations and aspartate amino transferase (AST), glutamate de- shidrogenase (GD) y gamma glutamil transferase (GGT) enzyme activities; body condition and live weight as well. Milk production was registered since partum to 7 postpartum week. Energy balance parameters were similar between groups (P>0.05) and milk production was higher in rbST than C (36.3 vs. 34.3 L/cow/d, P<0.05). The percentage of diseases presentation and reproductive parameters in both groups was similar (P>0.05), except for metritis being higher in control group (22.2 vs 5.4%; P<0.05). Results obtained allow to infer that the treatment of grazing dairy cows with low doses of rbST in transition period increases milk production without a detrimental effect on energy balance. d th th

Volume

24

Issue

2

First Page

172

Last Page

179

ISSN

07982259

Identifier

SCOPUS_ID:84901998165

Documento original

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