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Use of intrarumlnal soluble glass boluses containing two levels of melatonin for early lamb production

Published online by Cambridge University Press:  22 November 2017

D.C. Brown ,
E.M. Thomas ,
R A Jones  and
A L Poulton
D.C. Brown
Affiliation:
A.D.A.S., Rosemaund EHF, Preston Wynne, Hereford HR13PG
E.M. Thomas
Affiliation:
A.D.A.S., Rosemaund EHF, Preston Wynne, Hereford HR13PG
R A Jones
Affiliation:
Pilkington, Denbigh, Clwyd LL16 5TA
A L Poulton
Affiliation:
P.O. Box 92, Pennant Hills, Sydney, Australia
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Extract

It has been shown that giving mule ewes a soluble glass bolus which contained 150 rag melatonin on 2 July, advanced the onset of the oestrus cycle. This experiment was designed to investigate whether the dose rate of melatonin could be reduced.

  • 1.40 ewes not treated (control).

  • 2.40 ewes given glass bolus containing 150 mg melatonin.

  • 3.40 ewes given glass bolus containing 100 mg melatonin.

120 mule ewes (Blue-faced Leicester x Swaledale) aged between 4 and 6 years all of proven breeding ability were divided into 3 similar groups by age, weight and body condition on 2 July. One group was left untreated and 2 groups received a polymer-bonded soluble phosphate glass bolus (Pilkingtons P.L.C.) which contained the appropriate level of melatonin (Sigma Chemicals Corporation). Each bolus was cylyndrical in shape measuring 1.8 cm in diameter and 3.0 cm in length. Tho average mass and specific gravity of boluses were 23 g and and 3.0 respectively.

Type
Production and Management of Small Ruminants
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1989 , March 1989 , pp. 56
Copyright
Copyright © British Society of Animal Production 1989

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