Genetic Evaluation and Factors Affecting Post Weaning Growth Performance and Body Dimensions of Awassi Lambs.


  • Yousif M. S. Al-Barzinji Department of Animal Resource, College of Agriculture, University of Salahaddin, Erbil, Kurdistan Region, Iraq. Author
  • Haval I. A. Gardi Department of Animal Resource, College of Agriculture, University of Salahaddin, Erbil, Kurdistan Region, Iraq. Author



Genetic evaluation, Awassi lamb, Growth performance, BLUP Introduction


Present study was done to determent the genetic evaluations and effects of some nongenetic factors on post weaning performance and body dimensions of Awassi lambs in
Iraqi Kurdistan Region. A total of 86 lambs were used in this study post weaning weight,
gains and body dimensions until marketing age (6 month) were estimated on each lamb.
Data was subjected to analysis of variance to determine the effects of sex, horn, and
interaction between them on the growth and body dimensions of lambs. Sex, horn and
sex X horn significantly affected body weights and dimensions at all ages. Male and
horned lambs gave significantly higher weight and daily gain at different ages, as well as
the horned male and female gave higher weight and daily gain. Significant positive
correlations were found among body weight at different age, and all correlation among
weights with body dimensions at different ages were significant positive correlation
except the correlation among HG with body weight and dimensions at four month age.
The stepwise regression model were used to predict the body weight at 4 months of age
obtained for three out of eight dimensions with 61% R², but the best model to predict the
body weight at 5 months of age obtained for five dimensions with 87% R² and best one
for marketing age obtained from six dimensions with 88% R².
The effects of non-genetic factors necessary to be corrected before make the genetic
evaluations among animals, for it mixed model procedure ( Such as BLUP) are to be
used and BLUP values for lambs ranged from -11.902 to 10.697 kg for marketing
weight. These results indicated that there are high genetic variations among lambs for
this trait and it means that selection can play a big role in improving growth performance
in Awassi lambs.


Al-Alaq, M.M., Al-Fahad Y. and Abass T., "The Statistical Atlas Agricultural Roadmap for Agricultural

Development (Green Economy)" The Ministry of Planning (Central organization of Statistics) and

Agriculture, Iraq, Baghdad, Iraq, (2011). (Arabic Reference).

Al-Rawi, A.A., Al-Haboby A. H., and Salman A., "Small Ruminants Breeding, Reproduction Physiology Research

as Technology Transfer I Iraq" (W. Mourani, N. Haddad, Eds.), ICARDA West Asia Regional Program,

Amman, Jordan, (1996).

FAO (Food and Agriculture Organization), "Quarterly Bulletin of Statistics" Vol. 1, FAO, Rome, Italy, (2000).

Iniguez, L., "Characterization of Small Ruminant Breeds in West Asia and North Africa" volume 1: West Asia.

ICARDA, Syria, (2005).

Rashidi A., Mokhtari M.S., Safi Jahanshahi A., and Mohammad Abadi M.R., "Genetic parameter estimates of pre-

weaning growth traits in Kermani sheep" Small Rumin. Res., 74; 165-171, (2008). DOI:

SAS, "Statistical Analysis System User's Guide (Version 9) "SAS Institute Inc", Cary, NC, USA, (2004).

Henderson, C. R., "Application of Linear Models in Animal Breeding," University of Guleph. Guelph, ON., Canada,


Jeichitra, V. "Effect of Non-Genetic Factors on Post Weaning Relative Growth Rates in Mecheri Sheep"

International Journal of Food, Agriculture and Veterinary Sciences, 3 (1);101-103, (2013).

Momoh, O.M., Rotimi E.A. and Dim N.I., "Breed effect and non-genetic factors affecting growth performance of

sheep in a semi-arid region of Nigeria" Journal of Applied Biosciences, 67;5302 – 5307, (2013). DOI:

El-Wakil, Salwa I. and Manal E., "Genetic, Phenotypic and Environmental Trends Towards Improving Body

Weight in Barki Sheep" Egyptian Journal of Sheep and Goat Sciences, Vol. 8 (2); 11- 20, (2013). DOI:

Jafari1, S. and Hashemi A., "Genetic analysis of fleece and post-weaning body weight traits in Makuie sheep"

Genetics and Molecular Research, 13 (1); 1079-1087, (2014). DOI:

Aktas, A. H. and Dogan Ş., "Effect of live weight and age of Akkaraman ewes at mating on multiple birth rate,

growth traits, and survival rate of lambs," Turk J. Vet. Anim. Sci., 38: 176-182, (2014). DOI:

Rosov, A. and Gootwine E., "Birth weight, and pre- and postweaning growth rates of lambs belonging to the Afec-

Assaf strain and its crosses with the American Suffolk," Small Ruminant Research xxx– xxx. (2013). DOI:

Holman, B. W. B., and Malau-Aduli, A. E. O., "Growth and Body Conformation Responses of Genetically

Divergent Australian Sheep to Spirulina (Arthrospira platensis) Supplementation," American Journal of

Experimental Agriculture, 2(2); 160-173, (2012). DOI:

Jahan, M., Tariq M., Kakar M. A., Eyduran E. and Waheed A., "Predicting Body Weight from Body and Testicular

Characteristics of Balochi Male Sheep in Pakistan Using Different Statistical Analysis," The Journal of

Animal and Plant Sciences, 23(1); 14-19,(2013). DOI:

Al-Rawi, A. A., Salman A. D., Al-Azzawi W. A. and Ibrahim S. S.," Breeding values and genetic response of

lambs weight weaned and milk yield for Awassi ewes," IPA J. Agric. Res., 12 (3);67- 79,(2002).

Raaof, S. O., "Estimation of genetic and phenotypic parameters for lambs growth and evaluation of Hamdani ewes

for productive traits" PhD. Dissertation, Salahaddin University- Iraq, (2005).

Hussain, A., "Genetic evaluation of Thalli sheep in Pakistan," Ph.D Dissertation, University of AgricultureFaisalabad-Pakistan, (2006).

Al-Barzinji, Y. M. S., "A Study of Some Economical Traits With Breeding Value in Hamdani Sheep Using

Molecular Genetic Techniques," PhD. Dissertation, Salahaddin University- Iraq, (2009).



How to Cite

Genetic Evaluation and Factors Affecting Post Weaning Growth Performance and Body Dimensions of Awassi Lambs. (2015). Journal of Zankoy Sulaimani - Part A, 17(3), 25-32.

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