Genetic parameters and economic values of lactation somatic cell score and production traits
作者： M.J. Carabano , A.F. Groen , R. Alenda , N. Charfeddine
DOI:
关键词:
摘要: Heritabities and genetic phenotypic correlations for lactation somatic cell score (LSCS) production traits in first were estimated. Heritability of LSCS was 0.13. Genetic between LSCS, milk, fat protein yield positive (0.14 to 0.16). With percentage, showed negative negligible (-0.01 -0.02, respectively). Two methods defined express costs. The method used a non-linear function the penalty applied milk price with respect define costs, second costs as sum frequency each class multiplied by its penalty. Economic value basic situation -0.783 -0.540 ptas.score.Kg. .cow.year method, respectively. values estimated under free market quota situation, considering two Results that economic more reasonable less sensitive farm level. Parameters Values Lactation Somatic Cell Score Production Traits
参考文章(16)
M M Schutz, R L Powell, Genetic evaluations for somatic cell score Interbull Bulletin. ,(1993)
J.I. Weller, A.F. Groen, H. Pasternak, Selection indices for non-linear breeding objectives, selection for optima Interbull Bulletin. ,vol. 12, pp. 206- 214 ,(1996)
A. Meijering, Dystocia in dairy cattle breeding [:with special attention to sire evaluation for categorical traits] Meijering. ,(1986)
T Lund, F Miglior, J.C.M Dekkers, E.B Burnside, Genetic relationships between clinical mastitis, somatic cell count, and udder conformation in Danish Holsteins Livestock Production Science. ,vol. 39, pp. 243- 251 ,(1994) , 10.1016/0301-6226(94)90203-8
Henk Bekman, Johan A.M. van Arendonk, Derivation of economic values for veal, beef and milk production traits using profit equations. Livestock Production Science. ,vol. 34, pp. 35- 56 ,(1993) , 10.1016/0301-6226(93)90034-F
J. C. M. Dekkers, P. V. Birke, J. P. Gibson, Optimum linear selection indexes for multiple generation objectives with non-linear profit functions Animal Science. ,vol. 61, pp. 165- 175 ,(1995) , 10.1017/S1357729800013667
H.G. Monardes, J.F. Hayes, Genetic and Phenotypic Statistics of Lactation Cell Counts in Different Lactations of Holstein Cows Journal of Dairy Science. ,vol. 68, pp. 1449- 1455 ,(1985) , 10.3168/JDS.S0022-0302(85)80982-6
M. E. Goddard, Selection indices for non-linear profit functions. Theoretical and Applied Genetics. ,vol. 64, pp. 339- 344 ,(1983) , 10.1007/BF00274177
Jack C.M. Dekkers, Optimal Breeding Strategies for Calving Ease Journal of Dairy Science. ,vol. 77, pp. 3441- 3453 ,(1994) , 10.3168/JDS.S0022-0302(94)77287-8
G. Banos, G.E. Shook, Genotype by environment interaction and genetic correlations among parities for somatic cell count and milk yield. Journal of Dairy Science. ,vol. 73, pp. 2563- 2573 ,(1990) , 10.3168/JDS.S0022-0302(90)78942-4