The Outcomes of Selection in a Closed Herd on a Farm in Operation
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A herd of Berkshire pigs was established in 2003 and subjected to selection without introduction of any genetic resources until 2007. The complete pedigree, including 410 boars and 916 sows, as well as the records from 5,845 pigs and 822 litters were used to investigate the results obtained from the selections. The index of selection for breeding values included days to 90 kg (D90kg), backfat thickness (BF) and number of piglets born alive (NBA). The average inbreeding coefficients of pigs were found to be 0.023, 0.008, 0.013, 0.025, 0.026, and 0.005 from 2003 to 2007, respectively. The genetic gains per year were 12.1 g, –0.04 mm, –3.13 days, and 0.181 head for average daily gain (ADG), BF, D90kg, and NBA, respectively. Breeding values of ADG, BF and D90kg were not significantly correlated with inbreeding coefficients of individuals, except for NBA (–0.21). The response per additional 1% of inbreeding was 0.0278 head reduction in NBA. The annual increase of inbreeding was 0.23% and the annual decrease in NBA due to inbreeding was 0.0064 head. This magnitude could be disregarded when compared with the annual gain in NBA (0.181 head). These results suggest that inbreeding and inbreeding depression on ordinary farms can be controlled with a proper breeding scheme and that breeding programs are economical and safe relative to the risks associated with importation of pigs.
Abstract
A herd of Berkshire pigs was established in 2003 and subjected to selection without introduction of any genetic resources until 2007. The complete pedigree, including 410 boars and 916 sows, as well as the records from 5,845 pigs and 822 litters were used to investigate the results obtained from the selections. The index of selection for breeding values included days to 90 kg (D90kg), backfat thickness (BF) and number of piglets born alive (NBA). The average inbreeding coefficients of pigs were found to be 0.023, 0.008, 0.013, 0.025, 0.026, and 0.005 from 2003 to 2007, respectively. The genetic gains per year were 12.1 g, –0.04 mm, –3.13 days, and 0.181 head for average daily gain (ADG), BF, D90kg, and NBA, respectively. Breeding values of ADG, BF and D90kg were not significantly correlated with inbreeding coefficients of individuals, except for NBA (–0.21). The response per additional 1% of inbreeding was 0.0278 head reduction in NBA. The annual increase of inbreeding was 0.23% and the annual decrease in NBA due to inbreeding was 0.0064 head. This magnitude could be disregarded when compared with the annual gain in NBA (0.181 head). These results suggest that inbreeding and inbreeding depression on ordinary farms can be controlled with a proper breeding scheme and that breeding programs are economical and safe relative to the risks associated with importation of pigs.
참고문헌 (30)
- Bijma, P., "Accuracies of estimated breeding values from ordinary genetic evaluations do not reflect the correlation between true and estimated breeding values in selected populations", J. Anim. Breed. Genet, 129, pp.345~358 (2012)
- Bubliy, O. A., "Correlated responses to selection for stress resistance and longevity in a laboratory population of Drosophila melanogaster", J. Evol. Biol, 18, pp.789~803 (2005)
- Bulmer, M. G., "The effect of selection on genetic variability", Am. Nat, 105, pp.201~211 (1971)
- "Genetic parameters and their use in swine breeding" (2002)[URL]
- Chen, P., "Genetic parameters and trends for litter traits in U.S. Yorkshire, Duroc, Hampshire, and Landrace pigs", J. Anim. Sci, 81, pp.46~53 (2003)
- Curie-Cohen, M., "Estimates of inbreeding in a natural population : a comparison of sampling properties", Genetics, 100, pp.339~358 (1982)
- 도창희, "돼지에서 산육형질과 번식형질간의 관계", 한국동물자원과학회지, 49(3), pp.303~308 (2007), 한국동물자원과학회
- Edwards, S. A., "Effects of floor area allowance on performance of growing pigs kept on fully slatted floors", Anim. Prod, 46, pp.453~459 (1988)
- Falcorner, D. S., "Introduction to Quantitative Genetics" (1981), Longman
- Ferraz, J. B., "Animal model estimation of genetic parameters and response to selection for litter size and weight, growth, and backfat in closed seedstock populations of large white and Landrace swine", J. Anim. Sci, 71, pp.850~858 (1993)
- Gonyou, H. W., "Effects of floor area allowance and group size on the productivity of growing", finishing pigs, 1998, pp.76, 1326~1330
- Hanenberg, E. H. A., "Estimates of genetic parameters for reproduction traits at different parities in Dutch Landrace pigs", Livest. Prod. Sci, 69, pp.179~186 (2001)
- Henderson, C. R., "Best linear unbiased estimation and prediction under a selection model", Biometrics, 31, pp.423~447 (1975)
- Hermesch, S., "Genetic parameters for lean meat yield, meat quality, reproduction and feed efficiency traits for Australian pigs", Livest. Prod. Sci, 65, pp.239~248 (2000)
- Hill, W. G., "Variation in actual relationship as a consequence of Mendelian sampling and linkage", Genet. Res, 93, pp.47~64 (2011)
- Hofer, A., "Genetic evaluation of on-farm tested pigs using an animal model II. Prediction of breeding values with a multiple trait model", Livest. Prod. Sci, 30, pp.83~98 (1992)
- Hudson, G. F. S., "Genetic evaluation of swine for growth rate and backfat thickness", J. Anim. Sci, 61, pp.83~91 (1985)
- Imboonta, N., "Genetic parameters for reproduction and production traits of Landrace sows in Thailand", J. Anim. Sci, 85, pp.53~59 (2007)
- Jacquard, A., "The Genetic Structure of Populations" (1974), Springer-Verlag
- Johnson, Z. B., "Arkansas Animal Science Department Report 2008", pp.119~121 (2008), Division of Agriculture, University of Arkansas System
- Kaplon, M. J., "Genetic and phenotypic trends in Polish Large White nucleus herds", J. Anim. Sci, 69, pp.551~558 (1991)
- Kennedy, B. W., "Genetic properties of animal models", J. Dairy Sci, 71(2), pp.17~26 (1988)
- McKay, R. M., "Responses to index selection for reduced backfat thickness and increased growth rate in swine", Can. J. Anim. Sci, 70, pp.973~977 (1990)
- "WOMBAT" (2010)[URL]
- Animal Genetic Improvement White Paper, "NIAS(National Institute of Animal Science).", National Institute of Animal Science, ~ (2003)
- Powell, T. A., "Economics of space allocation for grower-finisher pigs: A simulation approach", J. Am. Soc. Farm Mgrs, 56, pp.67~72 (1992)
- Rodrigáñez, J., "Effect of founder allele survival and inbreeding depression on litter size in a closed line of Large White pigs", Anim. Sci, 67, pp.573~582 (1998)
- Savic, R., "Estimation of heritability coefficients of number of born alive piglets in the first three farrowings Swedish landrace sows", Bio. Anim. Husb, 27, pp.85~92 (2011)
- Shaw, D. V., "Response in genotypic and breeding value to a single generation of divergent selection for fresh fruit color in strawberry", J. Am. Soc. Hort. Sci, 120, pp.270~273 (1995)
- Silió, L., "Measuring inbreeding and inbreeding depression on pig growth from pedigree or SNP-derived metrics", J. Anim. Breed. Genet, 130, pp.349~360 (2013)