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Hormone variations in serum and milk of buffaloes (Bubalus bubalis) as potential indicators of treatment with recombinant bovine somatotropin

  • Lorenzo Castigliego (a1), Xiao Ning Li (a2), Andrea Armani (a1), Goffredo Grifoni (a3), Carlo Boselli (a3), Remo Rosati (a3), Daniela Gianfaldoni (a1) and Alessandra Guidi (a1)...

Abstract

Recombinant bovine somatotropin (rbST) is used to increase milk yield in cows, but it has been forbidden in some countries and in the EU. However, rbST misuse represents a concern in both bovine and buffalo dairy production. A number of studies on rbST treatment have been performed on bovines, but there are few data on buffaloes. In this study, we treated eight lactating buffaloes with biweekly injections of a slow-release formulation of rbST, for five cycles of administration, and analysed total ST and insulin-like growth factor 1 (IGF-1) variations in serum and IGF-1 in milk. The aim was to assess their power as potential indicators of rbST-treatment. Blood was collected on days 2, 5, 9 and 14 of each cycle, and milk on days 2, 9 and 14 of cycles 2 and 5. Results showed an extraordinary increase in ST levels on day 2 in treated animals, followed by a rapid decrease over the following days, while a significant increase in IGF-1 was observed both in serum and in milk throughout most of each cycle. These results suggest that serum ST levels are a good indicator of treatment. However, the rapid decrease after the peak limits the useful period of sample collection.

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Corresponding author

*For correspondence: lcastigl@vet.unipi.it

References

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Keywords

Hormone variations in serum and milk of buffaloes (Bubalus bubalis) as potential indicators of treatment with recombinant bovine somatotropin

  • Lorenzo Castigliego (a1), Xiao Ning Li (a2), Andrea Armani (a1), Goffredo Grifoni (a3), Carlo Boselli (a3), Remo Rosati (a3), Daniela Gianfaldoni (a1) and Alessandra Guidi (a1)...

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