Titre :	Modeling of reproduction, growth and productivity performances of sheep farming in the semi-arid region of Algeria : Case study of “Yehia Ben Aichouche farm”
Type de document :	document électronique
Auteurs :	Farida Belkasmi, Auteur ; Toufik Madani, Directeur de thèse
Editeur :	Faculté des sciences de la nature et de la vie
Année de publication :	2021
Importance :	144 Feuilles
Format :	30 cm
ISBN/ISSN/EAN :	DOC/232
Langues :	Français
Catégories :	Thèse et mémoire:Doctorat:Département de biologie et physiologie animale
Résumé :	Adapting to the difficult feed conditions in semi-arid regions of Algeria has particular interest for improving animal performances and livestock breeding productivity. The objectives of our study are to understand and assess the variability production performances of Ouled Djellal sheep, then set up the general patterns and models of variation of ewes’ body condition. Our study was carried out in a commercial farm ‘Yehia Ben Aichouche’ in the semi-arid region, and involved 696 ewes and 737 lambs of Ouled Djellal sheep breeds. Our results allowed us to estimate the animals’ production performances with the determination of limit values (2.75 at breeding and 2.5 at lambing) for enhanced performances. Achieved results also allowed us to find an association between ewes’ live weight and theirs body condition score, and makes possible to predict lambs’ birth weight. Our results showed that Gompertz and Logistics models represented the best the growth curves of Ouled Djellal lambs. The viability of lambs can be improved by consuming colostrum which has shown good quality in Ouled Djellal sheep breed. The strengthening of the sheep sector in Algeria requires adapted solutions to our production systems which consist in selecting the resilient ewes to better manage the feeding behavior and subsequently strengthen the sector by the most efficient animals that give the best performances.
En ligne :	http://dspace.univ-setif.dz:8888/jspui/retrieve/7449/Belkasmi%20farid

Modeling of reproduction, growth and productivity performances of sheep farming in the semi-arid region of Algeria : Case study of “Yehia Ben Aichouche farm” [document électronique] / Farida Belkasmi, Auteur ; Toufik Madani, Directeur de thèse . - Setif, Algerie : Faculté des sciences de la nature et de la vie, 2021 . - 144 Feuilles ; 30 cm.
ISSN : DOC/232
Langues : Français

Catégories :	Thèse et mémoire:Doctorat:Département de biologie et physiologie animale
Résumé :	Adapting to the difficult feed conditions in semi-arid regions of Algeria has particular interest for improving animal performances and livestock breeding productivity. The objectives of our study are to understand and assess the variability production performances of Ouled Djellal sheep, then set up the general patterns and models of variation of ewes’ body condition. Our study was carried out in a commercial farm ‘Yehia Ben Aichouche’ in the semi-arid region, and involved 696 ewes and 737 lambs of Ouled Djellal sheep breeds. Our results allowed us to estimate the animals’ production performances with the determination of limit values (2.75 at breeding and 2.5 at lambing) for enhanced performances. Achieved results also allowed us to find an association between ewes’ live weight and theirs body condition score, and makes possible to predict lambs’ birth weight. Our results showed that Gompertz and Logistics models represented the best the growth curves of Ouled Djellal lambs. The viability of lambs can be improved by consuming colostrum which has shown good quality in Ouled Djellal sheep breed. The strengthening of the sheep sector in Algeria requires adapted solutions to our production systems which consist in selecting the resilient ewes to better manage the feeding behavior and subsequently strengthen the sector by the most efficient animals that give the best performances.
En ligne :	http://dspace.univ-setif.dz:8888/jspui/retrieve/7449/Belkasmi%20farid