Estimation of Some Genetic Parameters of the Growth and Wool Characteristics of the Libyan Barbary Sheep
Article Sidebar
-
Birth Weight, Weaning Weight, Greasy Fleece Weight, Barbary Sheep, Heritability, Repeatability
Abstract
Records on 306 Libyan Barbary lambs descended from 232 ewes sired by 25 rams were included during the period from 2004 - 2009. Analyses were used by ASREML to estimate (CO)Variance, additive and maternal heritability, and correlations, fitting an animal model including maternal genetics for live weight traits. The objective was to evaluate the performance and previously mentioned genetic parameters in some traits of Barbary sheep in Libya. Mean birth weight (BW), weaning weight (WW) and adjusted weaning weights (adjWW) were 3.11±0.06, 21.11±0.08 and 21.62±0.02 kg respectively. Mean greasy fleece weight (GFW), staple length (SL) and number of crimps/2cm. was 1.98±0.67 kg., 9.67±1.64 cm. and 11.02±1.56 respectively. The additive heritability estimates for (BW), (WW) and (adj WW) were 0.11, 0.21 and 0.27 respectively. The maternal heritability estimates for (BW), (WW) and (adj WW) were 0.05, 0.11 and 0.25 respectively. These results indicate that selecting for improved maternal and direct effects in Barbary sheep would generate slow genetic progress in BW trait. Direct and maternal genetic and phenotypic correlations among the lamb weights varied between 0.08 and 0.966. The repeatability estimates for (GFW), (SL) and crimps/2cm were 0.13, 0.03, and 0.03, respectively. The positive phenotypic correlation coefficient between the wool traits of the Libyan Barbary sheep ranged from 0.61 to 0.456. The negative correlation ranged from –0.259 to –0.036; It was the highest positive and significant correlation between the number of fine and coarse crimps/2cm, which was 0.456, while the highest negative and significant correlation between the number of crimps of fine fiber and coarse fiber ratio was 0.259. It concluded that low estimates of additive and maternal heritability for live weights indicated the presence of less additive genetic variance and large environmental variance. Hence, improvement through selection may be limited in growth traits if the causes of environmental variation are not removed. Only year’s records can be trusted to predict performance in the wool traits when temporary environmental impacts are minimized.
Full text article
References
[1]- أحتاش، عبد الكريم 2015. مساهمة المجترات الصغيرة من إنتاج اللحوم في ليبيا. المجلة المصرية لعلوم الضأن والمعز. المجلد العاشر العدد الأول :13- 18 .
[2]- أحتاش، عبد الكريم 2005 . خصائص صوف الضأن البربري الليبي والعوامل المؤثرة فيها. مجلة العلوم الأساسية والتطبيقية ، المجلد الخامس عشر ، العدد الأول : 158- 180 .
[3]- Huisman, A. E., D. J. Brown, A. J. Ball and H.U. Graser (2008). Genetic parameters for bodyweight, wool, and disease resistance and reproduction traits in Merino sheep. 1. Description of traits, model comparison, variance components and their ratios. Austr. J. Experi. Agric., 48: 1177–1185.
[4]- Tariq M. M., M. A.Bajwa, F. A., A. Waheed, F. A. Bokhari and M.Rafiq. (2010) Heritability of pre-weaning growth performance traits in Mengali sheep in (Balochistan) Pakistan. Inter. J. of Biodiv. and Conserv. 2(10): 284-288 .
[5]- El-Awady, H. G. (2011). Different Animal Models for Estimating Genetic Parameters of Barki Sheep in Egypt. J. American. Sci., 7(9): 882-887.
[6]- El fadili, M.,C. Michaux, J. Detilleux, and P.L. Leroy (1999). Genetic parameters for growth traits of Moroccan Timahdite breed of sheep. Small Rumi. Res. 37: 203-208.
[7]- Snyman M.A., Erasmus G.J., van Wyk J.B. (1995). Non-genetic factors influencing growth and fleece traits in Afrino sheep.South African J. Anim. Sci., 25(3): 70-74.
[8]- Maria, G.A., K.G. Boldman, and L.D. Van Vleck, (1993) Estimates of variance due to direct and maternal effects for growth traits of Romanov sheep. J. Anim. Sci.,71: 845-849.
[9]- Akhtar, P., S. Ali, A. Hussain, M.A. Mirza, M.I. Mustafa and J.I. Sultan (2008). Heritability Estimates of Post-Weaning Performance Traits in Hissardale Sheep in Pakistan. Turk. J. Vet. Anim. Sci. 32(4): 275-279.
[10]- Safari E., N.M. Fogarty and A.R. Gilmour (2005). A review of genetic parameter estimates for wool, growth, meat and reproduction traits in sheep. Livest. Prod. Sci. 92 : 271–289.
[11]- Gilmour, A.R., B.J. Gogel, B.R. Cullis and R. Thompson (2009). ASREML User guide Release 3.0 VSN International Ltd. Hemel Hempstead, UK. www.vsni.co.uk.
[12]- SAS, (2002). User's guide: Statistics, version 9. 4th Ed. SAS Ins., Inc., Cary., NC, USA.
[13]- أحتاش ، عبد الكريم وعياد مجيد ومحمد صنام ونورالدين الجعودي 2007. وزن الميلاد والوزن عند عمر 70 يوم ووزن الفطام وما بعد الفطام في الضأن البربري الليبي . مجلة العلوم الأساسية والتطبيقية ، المجلد السابع عشر ، العدد الثاني : 23-33.
[14]- Magid, A.F. and M.A. Mursy (1992). Productivity of the Libyan Barbary sheep in Relation to face color. The Libyan journal of Agriculture 13:23-31.
[15]- Magid, A.F. and A.A. Zaied (1992). The Libyan Barbary sheep II. Growth and wool traits. The Libyan journal of Agriculture 13:13-21.
[16]- أحتاش ، عبد الكريم وسليمان هرماس وابراهيم عزاقة وعبد الرؤوف الكردي 2010. تأثير لون الوجه على معدلات النمو في حملان البربري الليبي . المجلة المصرية لعلوم الأغنام والماعز ، المجلد (5) العدد (1) .
[17]- بن عامر، أحمد رفيق ومحمد خير عبد الله أحمد 1992 . معدلات النمو ومتوسط الصفات التناسلية في أغنام البربري الليبية . المختار للعلوم ، العدد الأول : 27-30.
[18]- Behzadi, M.R., F.E. Shahroudi, and L.D. Van Vleck, (2007): Estimates of genetic parameter for growth traits in Kermani sheep. J. Anim. Breed. Genet. 124: 296-301.
[19]- El-Wakil, S. and S.M. Gad (2013). Estimates of (CO) variance components for direct and maternal effects on birth weight of Egyptian Barki lambs. J. Anim. Poult. Prod. 4(12):761-766.
[20]- Tijani, A. and I. Boujenane (1993). Estimation des parameters genetiques et phenotypiques des performances de croissance des agneauxe de rasce Timahdite au Maroc. Meeting of the EAAP : 16-19, Aarhus, Denmark.
[21]- El fadili, M., and P.L. Leroy (2001). Estimation of Additive and non-additive genetic parameters for reproduction, growth and survival traits in crosses between the the Moroccan Dman and Timahdite sheep breeds. J. Anim. Breed. Genet. 118: 341-353.
[22]- بن عامر، أحمد رفيق وأديب خروفة 1995 . مواصفات صوف الأغنام البربرية وبعض العوامل المؤثرة عليها . المختار للعلوم ، العدد الثاني : 38-46.
[23]- أحتاش ، عبد الكريم وعياد مجيد 2003. خصائص الصوف في مناطق الجسم المختلفة للضأن البربري الليبي . مجلة العلوم الأساسية والتطبيقية ، السنة الثانية عشر ، العدد الثاني عشر : 28-38.
[24]- الدباغ ، صميم فخري ونبيل نجيب أحمد ونزار دنون طه 2011. تقدير معامل الارتباط المظهري والمعامل التكراري لبعض الصفات الاقتصادية في النعاج العواسية والحمدانية. مجلة زراعة الرافدين. المجلد 39 العدد4 .
[25]- Chikhi, A. and I. Boujenane(2006). Effects genetiques et non genetiques sur le poids de toison des ovins des races Boujaad et sardi. Turk. J. Vet. Anim. Sci. 28:383-389.
[26]- Nakagawa, S., S. Mitsuyoshi, Y. Kazunori and Y. Atsush (2005). Estimation of genetic parameters for weight, reproduction and wool traits of Suffolk sheep. Nihon chikusan Gakkaiho. 76 (4):393-399.
Authors
This work is licensed under a Creative Commons Attribution 4.0 International License.
In a brief statement, the rights relate to the publication and distribution of research published in the journal of the University of Sebha where authors who have published their articles in the journal of the university of Sebha should how they can use or distribute their articles. They reserve all their rights to the published works, such as (but not limited to) the following rights:
- Copyright and other property rights related to the article, such as patent rights.
- Research published in the journal of the University of Sebha and used in its future works, including lectures and books, the right to reproduce articles for their own purposes, and the right to self-archive their articles.
- The right to enter a separate article, or for a non-exclusive distribution of their article with an acknowledgment of its initial publication in the journal of Sebha University.
Privacy Statement The names and e-mail addresses entered on the Sabha University Journal site will be used for the aforementioned purposes only and for which they were used.