Document Type : Research Paper
Authors
1 Biotechnology Research Department ,Animal Science Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
2 Biotechnology Research Department ,Animal Science Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.
3 Animal Science Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
Abstract
Monitoring the inbreeding rate of native chickens in breeding stations is of significant importance because of planned matings and lack of gene flow in the population. This study was undertaken to estimate the inbreeding coefficient, investigate the trend of inbreeding changes and evaluate the effects of inbreeding depression on the economic traits in Isfahan improved native chicken population. The studied traits were body weight, age at sexual maturity, weight at sexual maturity, egg number, mean egg weight and egg weight at first day. In the present study, data of 97272 birds recorded during 21 generations were included. In order to estimate the inbreeding coefficient of each bird and the effect of inbreeding on the traits, CFC and WOMBAT software were used, respectively. Pedigree analysis indicated that 79.48 percent of population were inbred. The estimated average individual and maternal inbreeding coefficients were 4.3 and 3.5 percent, respectively. According to results, for every one percent increase in inbreeding, rate of inbreeding depression for the traits including the body weight in 1 day, 8 weeks and 12 weeks, age at sexual maturity, weight at sexual maturity, egg number, average weight of eggs and egg weight at first day was -0.008, -2.52, -3.51, 0.23, -3/97, -0.13, 0/02 and 0.06, respectively. Based on the results of the present study, although in closed populations under genetic selection, the absence of inbred bird is almost impossible, but, the reduction of inbreeding can be achieved by controlling the matings, which prevents the adverse effects of inbreeding in the population.
Keywords
- Alipour AA (2000) Estimation of inbreeding and its effect on production and reproduction traits in a commercial broiler line. Msc. Thesis, Imam Khomeini Higher Education Center, Tehran.
- Aslam ML, Bastiaansen JW, Crooijmans RP, Ducro BJ, Vereijken A and Groenen MA (2011) Genetic variances, heritabilities and maternal effects on body weight, breast meat yield, meat quality traits and the shape of the growth curve in turkey birds. BMC Genetics, 25:12-14.
- Barros EA, Brasil LHA, Tejero JP, Delgado-Bermejo JV and Ribeiro MN (2017) Population structure and genetic variability of the Segureña sheep breed through pedigree analysis and inbreeding effects on growth traits. Small Ruminant Research, 149:128-133.
- Besbes B and Gibson JP (1999) Genetic variation of egg production traits in purebred and crossbred laying hens. Animal Science, 68(3): 433-439.
- Cahaner A, Abplanalp H and Shultz FT (1980) Effects of inbreeding on production traits in turkeys. Poultry Science, 59: 1353-1362.
- Cassell BG, Amec V and Pearson RE (2003) Effect of incomplete pedigrees on estimates of inbreeding and inbreeding depression for days to first service and summit milk yield in holsteins and Jerseys. Journal of Dairy Science, 86:2967-2976.
- Clement V, Bibe B, Verrier E., Elsen JM., Manfredi E, Bouix J and Hanocq E (2001) Simulation analysis to test the influence of model adequacy and data structure on the estimation of genetic parameters for traits with direct and maternal effects. Genetics Selection Evolution, 33:369-395.
- Dickerson GE (1963) Experimental evaluation of selection theory in poultry. Genetics Today. Int. Congress of Genetics, vol. 11. Proceedings, The Hague, The Netherland, 747-761.
- Fernandez J, Villanueva B, Pong-Wong R and Toro MA (2005) Efficiency of the use of pedigree and molecular marker information in conservation programs. Genetics, 170: 1313-1321.
- Gharahdaghi AA, Ghorbani S, Kamali MA and Abbasi MA (2014) Estimation of parameters and genetic trend of economic traits in native chickens of West Azerbaijan Province. Animal Science Journal, 27(104): 243-254. (In Persian)
- Ghorbani S and Emrani H (2020) Estimation of inbreeding rate and its depression on the economic traits of genetically improved native chickens of north of Iran. Animal Sciences Journal, 33(128): 109-124. (In Persian)
- Lewis F, Butler A and Gilbert L (2011) A unified approach to model selection using the likelihood ratio test. Methods in Ecology and Evolution, 2: 155-162.
- Liu G, Dunnington EA and Siegel PB (1993) Maternal effects and heterosis for growth in reciprocal cross population of chickens. Journal of Animal Breeding and Genetics, 110: 423-428.
- Meyer K (2007) WOMBAT, A tool for mixed model analyses in quantitative genetics by REML. Journal of Zhejiang University Science-B, 8:815-821.
- Miglior F, Burnside EB and Dekkers J (1995) Nonadditive genetic effects and inbreeding depression for somatic cell counts of Holstein cattle. Journal of Dairy Science, 78(5): 1168-1173.
- Nicholas FW (1989) Incorporation of new reproductive technology in genetic improvement programmes. In: Hill WG and Mackay TFC (Eds.), Evolution and Animal Breeding. CAB International, Wallingford. pp. 203-209.
- Nordskog AW, Tolman HS, Casey DW and Lin CY (1974) Selection in small populations of chickens. Poultry Science, 53: 1188-1219.
- Padhi MK (2016) Importance of indigenous breeds of chicken for rural economy and their improvements for higher production performance. Scientifica, 2016: 2604685.
- Pakdel A, Van Arendonk JA, Vereijken AL and Bovenhuis H (2002) Direct and maternal genetic effects for ascites-related traits in broilers. Poultry science, 81: 1273-1279.
- Quinton M, Smith C and Goddard ME (1992) Comparison of selection methods at the same level of inbreeding. Journal of Animal Science, 70(4): 1060-1067.
- Sargolzaei M, Iwaisaki H and Colleau JJ (2006) A tool for monitoring genetic diversity. In proceeding of the 8th World Congress Genetics Applied Livestock. ProBelo Horizonte, Brazil.
- Sewalem A, Johansson K, Wilhelmson M and Lillpers K (1999) Inbreeding and inbreeding depression on reproduction and production traits of White Leghorn lines selected for egg production traits. British Poultry Science, 40:203-208.
- Szwaczkowski T, Cywa-Benko K and Wezyk S (2003) A note on inbreeding effect on productive and reproductive traits in laying hens. Animal Science Papers and Reports, 21(2):121-129.
- Tongsiri S, Jeyaruban GM, Hermesch S, van der Werf JH, Li L and Chormai T (2019) Genetic parameters and inbreeding effects for production traits of Thai native chickens. Asian-Australasian journal of animal sciences, 32(7): 930-938.
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