Journal of Animal Production, Print ISSN: 2008-6776., Online ISSN: 2382-994X

A study on inbreeding coefficient trend of lamb and parents and its effect on wool weight of Iran Black sheep in Animal Breeding Station of Abbas Abad

Document Type : Research Paper

Authors

Ghasem Motaghinia 1
Homayoun Farhangfar 2
Mohsen Ahmadi Shahrakht 1
Abdolahad Shadparvar 3
Majid Jafari 4

1 M.Sc. Expert, Agriculture Department, Southern Khorasan University of Payame Noor, Birjand - Iran

2 Professor, Department of Animal Science, Faculty of Agriculture, University of Birjand, Birjand – Iran

3 Associate Professor, Department of Animal Science, Faculty of Agriculture, University of Guilan, Rasht - Iran

4 Expert, Animal Breeding Station of Abbas Abad, Agriculture Jihad Organisation of Razavi Khorasan, Mashhad - Iran

https://doi.org/10.22059/jap.2014.52225
Abstract
Effects of lamb and parents coefficient of inbreeding (CI) on wool weight were studied using 10,868 wool records belonging to 3,244 Iran Black lambs (1,633 males and 1,611 females) representing 96 rams and 995 ewes collected during 1983-2006 from Animal Breeding Station of Abbas Abad. Year and month of shearing, CI of lamb and dam, sex and birth type had significant affect on wool weight Among 3,244 pedigree animals, 3,005 heads (92.6 percent) were found to be inbred. Mean and standard deviation of CI of lamb, sire and dam in whole population were 8.1±6.1, 6.5±6.1 and 5.3±5.8 percent, respectively. The corresponding figures in inbred population were 9.0±5.7, 7.0±6.1 and 5.7±5.8 percent, respectively. Minimum and maximum CI of lamb was 0 and 36.4 percent, respectively. Increase of CI by one percent was accompanied with a decrease of 26.9 g (quadruplet male), 4.8 g (twin female), 4.3 g (triple female) and 13.1 g (quadruplet female) in wool weight. A decrease of 1.4 g in wool weight of lamb was observed as the CI of dam was increased by one percent. Statistically significant annual change trend were estimated to be 0.2±0.02 percent and 0.1±0.02 percent for whole and inbred populations, respectively. A controlled mating is needed to reduce deleterious effects of inbreeding.

Keywords

Inbred lambs
inbreeding
Iran Black sheep
Mixed model
Wool weight
1 . متقی­نیا ق (1389) آنالیز فنوتیپی و ژنتیکی صفت وزن شیرگیری گوسفندان بلوچی مرکز اصلاح نژاد دام شمال شرق کشور. پایان­نامه کارشناسی ارشد. دانشکده کشاورزی. دانشگاه بیرجند. ایران.
2 . متقی­نیا ق، فرهنگ­فر ه، باشتنی م، شادپرور ع، ساقی د ع و جنتی ح. (1389) بررسی اثر پسروی ناشی از تبارآمیزی بر وزن شیرگیری گوسفندان بلوچی ایستگاه اصلاح نژاد عباس­آباد مشهد. مجموعه مقالات چهارمین کنگره علوم دامی ایران. کرج. صص. 3308-3311.
3 . متقی­نیا ق، فرهنگ­فر ه، احمدی شاهرخت م و جعفری م. (1390) تأثیر تبارآمیزی بر صفت وزن پشم گوسفندان بلوچی مرکز اصلاح نژاد دام شمال شرق کشور. نخستین سمینار ملی مدیریت پرورش دام و طیور در مناطق گرمسیر. دانشگاه شهید باهنر کرمان. صص. 284-288.
4 . مختاری م (1382) برآورد روند ژنتیکی صفات رشد در گوسفند نژاد کرمانی. پایان­نامه کارشناسی ارشد. دانشکده کشاورزی. دانشگاه شهید چمران اهواز. ایران.
5 . وطن‌خواه م، طالبی م ع و ادریس م. ع. (1379) بررسی برخی عوامل محیطی و ژنتیکی مؤثر بر تولید پشم و همبستگی آن با صفات تولیدمثل در گوسفند بختیاری. مجموعه مقالات اولین سمینار پژوهشی پوست، چرم و الیاف دامی کشور. مؤسسه تحقیقات علوم دامی کشور. صص. 41-35.
 
6 . Bijma P, Van Arendonk JAM and Woolliams JA (2001) Predicting rates of inbreeding for livestock improvement schemes. Animal Science. 79: 840-853.
7 . Ercanbrack S and Knight A) 1991 (Effects of inbreeding on reproduction and wool production of Rambouillet, Targhee and Columbia ewes. Animal Science. 69: 4734-4744.
8 . Falconer DS and Mackay TFC (1996) Introduction to Quantitative Genetics. 4th edition. Longmans Green, Harlow, Essex, UK.
9 . Lamberson WR, Thomas DL and Rowe KE (1982) The effects of inbreeding in a flock of Hampshire sheep. Animal Science. 55: 780-786.
10 . Lee G, Wiener G and Woolliams JA (1994) Effects of breed, rapid inbreeding, Cross breeding and environmental factors on fleece weight and shedding in sheep. Animal Production Science. 59: 61-70.
Journal of Animal Production, Print ISSN: 2008-6776., Online ISSN: 2382-994X
Volume 16, Issue 1 - Serial Number 1
Spring and Summer
Spring 2014
Pages 1-9

Home

Guide for Authors

Submit Manuscript

Reviewers

Contact Us