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The effects of long-term administration of bovine growth hormone on the lactational performance of identical-twin dairy cows

Published online by Cambridge University Press:  02 September 2010

C. J. Peel ,
L. D. Sandles ,
Kaylene J. Quelch  and
A. C. Herington
C. J. Peel
Affiliation:
Ellinbank Dairy Research Institute, Warragul 3820, Australia
L. D. Sandles
Affiliation:
Ellinbank Dairy Research Institute, Warragul 3820, Australia
Kaylene J. Quelch
Affiliation:
St Vincents School of Medical Research, Fitzroy, Victoria 3065, Australia
A. C. Herington
Affiliation:
Medical Research Centre, Prince Henry's Hospital, Melbourne 3004, Australia
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Abstract

The effect of chronic administration of bovine growth hormone (GH) on milk production, food intake and live-weight change was evaluated in five sets of monozygotic twin cows on pasture. Purified bovine pituitary GH (specific activity, 0·78 IU/mg) was administered by daily subcutaneous injections (39 IU/day) for a period of 22 weeks (weeks 5 to 26 of lactation). GH treatment resulted in significantly higher yields of milk (23·3 kg/day), fat (0·97 kg/day), protein (0·74 kg/day) and lactose (115 kg/day) compared with the control group (19·8 kg/day, 0·79 kg/day, 0·63 kg/day, 0·99 kg/day). Milk composition did not differ between treatment groups. There was no difference in the intake of cut grass in week 8 but the voluntary intake of the GH group had increased by week 22 (controls, 15·4 kg dry matter (DM) per day and GH group, 17·5 kg DM per day). There were no differences in the rate of live-weight change for the two groups. Serum somatomedin concentrations were significantly elevated in the GH group on weeks 20 to 22 of treatment (0·043 v. 0·135 U/ml). This experiment indicates that cows chronically treated with GH were able to adjust their food intake upwards to sustain a substantial increase in milk production on a diet composed solely of grass.

Type
Research Article
Information
Animal Production , Volume 41 , Issue 2 , October 1985 , pp. 135 - 142
Copyright
Copyright © British Society of Animal Science 1985

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References

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