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Accueil du site → Doctorat → Royaume-Uni → 1988 → Economic and technical aspects of lactation in Awassi sheep with special reference to simplified recording and system development under semi-arid conditions

University College of North Wales (1988)

Economic and technical aspects of lactation in Awassi sheep with special reference to simplified recording and system development under semi-arid conditions

Fadel, I.

Titre : Economic and technical aspects of lactation in Awassi sheep with special reference to simplified recording and system development under semi-arid conditions.

Auteur : Fadel, I.

Université de soutenance : University College of North Wales

Grade : Doctor of Philosophy (Ph.D.) : 1988

Résumé
Various aspects related to sheep, e.g. systems of production and milking, processing and marketing milk products, problems of milking and sheep production in Syria are examined in this thesis. The shape of the lactation curve in relation to some non-genetic factors, sheep raising systems and milk quality were studied for the period from 1979 up to 1987 in order to investigate. The shape of lactation curve was investigated at the pre- and post-weaning stages in various sheep production systems in terms of profit, and diurnal variation in milk quality at equal intervals of morning and evening milking, and at the different stages of lactation. These investigations showed that in the pre-weaning stage, the lactation curve was inconsistent, suggesting that no general useful equation could be determined and in the post-weaning stage, the lactation curve was far more consistent and slightly curvilinear. Lambing season and age of ewe were of importance in determining its shape ; selection line (flock) had no effect on the shape of lactation curve, but significantly affected milk yield. On the basis of the results obtained from these present studies, it is suggested that the project of Awassi sheep improvement and sheep management or production systems can be developed by : (1) Simplifying the recording system, particularly useful for screening commercial flocks. (2) Maximising the income of sheep production systems through milking the residual for sale purposes after lamb suckling during the period from parturition up to weaning at age of 60 days. (3) The higher percentages of milk fat content and total solids in the evening milking over that of morning milking may be important in devising procedures for estimating total milk production, or when processing milk products

Mots Clés : Sheep/milk production in Syria Livestock Pets Human anatomy Agricultural engineering Livestock Human anatomy Agricultural engineering

Présentation : EThOS (UK)

Proquest Dissertations & Theses

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