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University College of North Wales (1986)

Reproduction in the Awassi ewe particular reference to increasing efficiency under semi-arid conditions

Kassem, Riad

Titre : Reproduction in the Awassi ewe particular reference to increasing efficiency under semi-arid conditions.

Auteur : Kassem, Riad.

Université de soutenance : University College of North Wales

Grade : Doctor of Philosophy (Ph.D.) : 1986

Résumé
Traditionally reared Awassi sheep provide the bulk of Syrian sheep products which, including milk, meat, wool and skins, were valued at 1.5 billion Syrian pounds in 1977. It follows therefore that increasing the reproductive performance of Awassi ewes will have a significant effect on the Syrian economy. At the Kraim research station, various aspects of reproduction have been studied in order to investigate the possibilities of improving the reproductive performance of female Awassi sheep. Sheep production data were recorded from 1979-1985. Detailed analyses were carried out on the data to investigate : (i) The possibility of breeding from ewe lambs at 7-9 months. (ii) The factors affecting the interval from lambing to oestrus and conception. (iii) The effect of age and body weight on ewe reproductive performance. (iv) The factors affecting lamb survival. The results obtained from these investigations showed that the proportion of ewe lambs, aged between 7-9 months that conceived, increased with good nutrition and exposure to rams from the beginning of the breeding season. The effect of presence of rams is an interesting finding since most of the previous studies reviewed, reported an effect of rams suddenly introduced in the pre-pubertal stage

Mots clés : Sheep production in Syria Livestock Pets Zoology Veterinary medicine Livestock

Annonce : EThOS (UK)

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