Bovine somatotrophin stimulates milk production in red deer hinds
G. K. Barrell A D , J. A. Archer B , M. Wellby A , M. J. Ridgway A and M. J. Evans CA Agriculture and Life Sciences Division, PO Box 84, Lincoln University, Lincoln 7647, New Zealand.
B AgResearch Invermay, Private Bag 50-034, Mosgiel 9053, New Zealand.
C Endolab, Department of Endocrinology, Christchurch Hospital, Christchurch, New Zealand.
D Corresponding author. Email: barrell@lincoln.ac.nz
Animal Production Science 49(7) 619-623 https://doi.org/10.1071/EA08288
Submitted: 25 November 2008 Accepted: 17 February 2009 Published: 11 June 2009
Abstract
To determine its potential as a tool for studies of growth in suckling red deer calves, bovine somatotrophin (bST) was administered to lactating red deer hinds. The present study used twice-daily machine milking of bST-treated hinds (n = 10, 54 mg bST for 2 weeks then 108 mg for 1 week) and compared the milk yield with that of saline-treated controls (n = 9). Treatment with 54 mg bST tended to increase milk yield by ~16% and the 108-mg dose increased (P = 0.013) milk yield by ~32%. Both doses of bST increased (P < 0.05 and P < 0.001, respectively) plasma insulin-like growth factor-1 concentration but did not affect total solids or fat content of the milk, nor was there any effect on body condition score or liveweight of the hinds. This shows that milk production in red deer hinds is increased by administration of bST, which makes it a suitable experimental technique for investigating the lactational biology of red deer.
Acknowledgements
We thank Monsanto Co. (St Louis, MO, USA), especially Gregg Bogosian, for generous donation of bST. Dr Lloyd Moore of AgResearch, New Zealand, is thanked for his generous donation of cervine IGF-1. Omega Amoafo, Victoria Barrell, Long Cheng, Alastair Nicol and Craig Trotter are thanked for their help with the milking procedure. We are indebted to Alastair Nicol for his knowledgeable advice on the conduct and interpretation of these studies. This project was funded as a subcontract to AgResearch Contract C10X0202 from the Foundation of Research, Science and Technology, New Zealand.
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