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The effect of selection for traits of low heritability conducted in noninbred populations on the basis of progeny or performance tests

100%

Sobczynska M., Kownacki M.

Journal of Applied Genetics

1995

tom 36

nr 2

The investigations were carried out to compare selection conducted on the basis of progeny with that on the basis of animals'own performance. Selection was conducted for the body weight at weaning (at the age of 21 days), which is a trait of low heritability (h²=0.1). It was run throughout 15 generations, whereas in generations 13 and 14 three experimental replicas were crossed to obtain population free of inbreeding. A cumulated response to selection was higher in the group selected on the basis of animals' own performance, but after crossing the replicas it decreased clearly in the both groups. The cumulated selection differential was higher in the group selected on the basis of animals' own performance. However, a statistical analysis of the obtained results showed no significant difference between the two selection methods.

Environmental stability and heritability estimates for grain yield and test weight in triticale

84%

Barnett R. D., Blount A. R., Pfahler P. L., Bruckner P. L., Wasenberg D. M., Johnson J. W.

Journal of Applied Genetics

2006

tom 47

nr 3

Hexaploid triticale has many advantages over both parental species for both grain and forage production in certain environments. Additional information on environmental stability and heritability would be desirable to develop appropriate selection strategies in the production of superior widely-adapted cultivars. The grain yield of 22 diverse genotypes grown at four ecologically-distinct geographical locations [Quincy, FL, USA (approximate geographical coordinates (AGC) = 30°N 84°W, approximate elevation (AE) = 58 m), Plains, GA, USA (AGC = 32°N 84°W, AE = 76 m), Bozeman, MT USA (AGC = 45°N 111°W, AE = 1458 m), and Aberdeen, ID, USA (AGC = 42°N 112°W, AE = 1360 m)] was measured in two years with winter and spring planting dates only at Bozeman and Aberdeen. Test weight (grain weight in a given volume) was determined for two years at Bozeman and Aberdeen at both planting dates and one year at Quincy. Stability analyses indicated that significant (P <0.01) variation in means, regression coefficients, and deviation mean squares of the genotypes were present for both characters. Realized heritability (h²) estimates were as follows: grain yield ranged from -0.02 to 0.80 with a mean of 0.57; test weight ranged from 0.63 to 1.05 with a mean of 0.93. The results indicated that substantial genetic variation is present and selection for widely-adapted cultivars would be effective for both characters especially test weight.

Ograniczanie wyników

2 Journal of Applied Genetics

1 Barnett R. D.

1 Blount A. R.

1 Bruckner P. L.

1 Johnson J. W.

1 Kownacki M.

1 Pfahler P. L.

1 Sobczynska M.

1 Wasenberg D. M.

1 2006

1 1995

Wyniki wyszukiwania

The effect of selection for traits of low heritability conducted in noninbred populations on the basis of progeny or performance tests

Environmental stability and heritability estimates for grain yield and test weight in triticale