1-I shag I.A and I.A. Yousif, 2002. Some factors influencing the productive and reproductive traits of crossbred cows raised under Sudan condition. The Third Scientific Agricultural Sciences Conference, Faculty of Agriculture Assiut University Vol. II

 2-Yousif, I. A and I.A Isharg, 2002. Genetic and Phenotypic Relationships for the First Calving Traits of Sudanese Crossbred Dairy Cattle, the Third Scientific Agricultural Sciences Conference, Faculty of Agriculture, Assist UniversityVol. II

 3-I.A. Yousif and A.A. Fadl El- Moula, 2006.Characterization  of Kenana Cattle Breed and its Production Environment. Animal Genetic Resource Information 38,47-57.

  4-  I.A. Yousif, K.M. Elamin, H.A. Wageeala and A.A. Rahman,2003. Estimates of Genetic and Phenotypic Parameters for Egg Production Traits in Indigenous Fowl of Sudan. The Sudan Journal of Animal Production. 16, 40-47.

 5-    K.M. Elamin, I.A. Yousif and A.A Rahman, 2004. Evaluation of Egg QualityTraits of the Sudanese Large Beladi Fowl. The Sudan Journal of Animal Production, 17, 78-85.

  6- Mekki Dafaalla mohammed, Yousif Ibrahim Abdalsalam, Abdel Rahman Mohmmed Kheir, Wang Jin- yu and     Musa Hassan Hussein, 2005. Growth Performance of Indigenous X Exotic Crosses of Chicken and Evaluation of General and Specific Combing Ability under Sudan Condition. Interrnational Journal of Poultry Science. 4, 468- 471.

 7-Mekki Dafaalla Mohammed, Yousif Ibrahim Abdalsalam, Abdelrahman Mohammed Kheir, Wang Jin- yu and Musa Hassan Hussein, 2005. Comparison of the Egg Characteristics of Different Sudanese Indigenous Chicken Types. 4, 455- 457.

 8-.A. Yousif, A.M. Ismail, A.A Mohammed and M. F. Suleiman, 2006. Growth Curves and Factors Affecting Body Weight in Indigenous Chicken Prior to Age at Sexual Maturity. U of K. J. Agric. Sci, 3, 450- 461.

 9-I.A. Yousif, M. F Sulieman, A.M. Iswail and K.M Elamin. 2004. Estimation of Genetic and Phenotypic Parameters of Body Weight at Various Ages in Indigenous Chicken of Sudan ,the Sudan journal of Animal Production Vol 18 ( Accepted)

 10-M.O. Elsheikh,I.A.Yousif, F.A. Elzubeir and A.A. Elfaki, 2007. Production Performance, Oviposition pattern and Incubation Behavior in large Beladi Chicken of Sudan (Ready for submission for publication in livesstock Research  For Rural Development.

11- Hassan H. E., Elamin K. M., Yousif I. A., Musa A. M. and Elkhairey M. A.    J Anim Sci Adv 2012, 2(4): 407-415  Evaluation of Body Weight and some Morphometric Traits at Various Ages in Local Rabbits of Sudan

  12-K.M.Elamin ,I.A.Yousif,M.K.A.Ahmed ,S.A.Mohammeda and A.A.Tameem Eldar. Estimation of Genetic,Phenotypic and Environmental Parameters of Morphometric Traits in Sudanese Rabbit.

13-Yousif, I. A. and Osman, A. H. (1994). Production traits and parameters of the indigenous chicken of Sudan. Sud. J. Vet. Sci. Anim. Husb., 33(1,2): 90-95.

14-I.A. Yousif, A. M. Ismail, A. A. Mohamed and M. F. Suleiman (2006). Growth Curves and Factors Affecting Body Weight in Indigenous Chicken Prior to Age at Sexual Maturity. Uof K. J. Agric. Sci. 14(3) 450-461.

15-El Tahir, S. Shuiep, Ibtisam, E. M. El Zubeir, Ibrahim A. Yousif and Erhardt G. (2013). Genetic diversity among Sudanese indigenous cattle (camelus dromedaries) at milk protein genes. Vortragstagung der DGfZ und GfT am 16./17. September 2009 in Gießen.

16-I.A. Yousif (1993). Genetic Properties and Attributes of Exotic and Local Poultry Breeds used for Breeding. Symposium on Technical and Economical Aspects for Production of Layer and Broiler Chicks Parents (in Arabic Language). Arab Organization for Agricultural Development, Cairo, Egypt

17-I.A. Yousif (2000). Characterization and Conservation Plan of the Sudanese Kenana Cattle Breed (Abstract). Regional Conference on Sustainable Animal Agriculture and Crisis Mitigation in Livestock- Dependent System in South Africa, Malawi Institute of Management (MIM), Lilongwe, Malawi

18-Ishag, I. A. and I. A. Yousif. (2002). Some Factors Influencing the Productive and Reproductive Traits of Crossbred Cows Raised Under Sudan Conditions. The 3rd Scientific Agricultural Sciences Conference, Faculty of Agriculture, Assiut University, Vol. 11.

19-Yousif, I. A. and Ishag, I. A. (2002). Genetic and Phenotypic Relationships for the First Calving Traits of Crossbred Dairy Cattle. The 3rd Scientific Agricultural Sciences Conferences, Faculty of Agriculture, Assiut University, Egypt, Vol. 11.

20Ibrahim Abdelsalam Yousif (2008). Poultry Breeding in Arab World: Vision, Problems and Prospects.

Comparative Study on some Socioeconomic Aspects of Rearing Camel Under Semi Intensive and Nomadic Production Systems in Sudan