Title page for ETD etd-08072009-175647


Document Type Master's Dissertation
Author Lee, Karen
Email karenL@nda.agric.za
URN etd-08072009-175647
Document Title Reproductive management of semi-intensive Döhne Merino ewes fed with different protein supplements management of semi-intensive
Degree Msc
Department Animal and Wildlife Sciences
Supervisor
Advisor Name Title
Prof W A van Niekerk Committee Co-Chair
Prof E C Webb Supervisor
Keywords
  • protein supplements
  • ewes
Date 2009-04-23
Availability unrestricted
Abstract

Two trial were conducted to determine the possible effects of season, protein supplementation, age and birth status on the reproduction rate (ovulation rate and rate of twinning) of ewes. In Trial 1 the weight, age and birth status if ewes were recorded. 144 ewes were randomly allocated in two treatment groups (urea and mix protein group) synchronised, mated and the number of corpora lutea, foetuses observed, lambs born per ewe and the mass of the ewe after lambing were also recorded. Lambing status or the 1-year-old (0.993 ± 0.316) and 2-year-old (1.233 ± 0.134) ewes were lower (p < 0.05) than that of the 6- year-old ewes (1.897 ± 0.248). The lambing status and the number of corpora lutea of the single born ewes (1.179 ± 0.131; 1.274 ± 0.138) were lower (p < 0.0001) than that of the twin born ewes (1.614 ± 0.139; 1.782 ± 0.147), within the urea treatment. In Trial 2, 75 ewes were randomly allocated in four treatment groups (raw lupins, cooked lupins, cottonseed oil-cake and Fescue grass), synchronised and the number of corpora lutea were recorded. The weight, age and birth status of the ewes were also recorded. The number of corpora lutea from the cooked lupin group (1.815 ± 0.184) was significantly higher than that from the cottonseed oilcake group (1.048 ± 0.209), within the twin born ewe group. It was concluded that season, protein supplementation, age and birth status influenced the reproduction rate of ewes.

Copyright © 2008, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.

Please cite as follows:

Lee, L 2008, Reproductive management of semi-intensive Döhne Merino ewes fed with different protein supplements, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-08072009-175647/ >

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