Comparison of variance components for test-day electrical conductivity of milk and test-day somatic cell score for first lactation cows in an experimental herd
作者： Elise Norberg , Jørgen Ødegård , Per Madsen
DOI: 10.1080/09064700410010035
关键词:
摘要: In recent decades, electrical conductivity (EC) has been introduced as an indicator of mastitis, and genetic selection based on this trait may be possible. study, parameters for test-day EC somatic cell score (SCS) were compared. Data collected from a Danish experimental herd, including daily records SCS 265 first lactation cows. Different models tested, random regression animal model with 4th order Legendre polynomial the permanent environmental effect both traits, 1st additive 2nd SCS, gave best fit. The patterns curves similar variance two traits. Heritability estimates ranged 0.05 to 0.12, 0.01 0.09, respectively. estimate correlation between traits was high, ...
informaworld.com参考文章(25)
G.J.T. Swanson, R.A. Mrode, Genetic and statistical properties of somatic cell count and its suitability as an indirect means of reducing the incidence of mastitis in dairy cattle Animal Breeding Abstracts (United Kingdom). ,(1996)
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
E. Norberg, G.W. Rogers, R.C. Goodling, J.B. Cooper, P. Madsen, Genetic parameters for test-day electrical conductivity of milk for first-lactation cows from random regression models. Journal of Dairy Science. ,vol. 87, pp. 1917- 1924 ,(2004) , 10.3168/JDS.S0022-0302(04)73350-0
J. Philipsson, G. Ral, B. Berglund, Somatic cell count as a selection criterion for mastitis resistance in dairy cattle Livestock Production Science. ,vol. 41, pp. 195- 200 ,(1995) , 10.1016/0301-6226(94)00067-H
P. López-Romero, M.J. Carabaño, Comparing alternative random regression models to analyse first lactation daily milk yield data in Holstein–Friesian cattle Livestock Production Science. ,vol. 82, pp. 81- 96 ,(2003) , 10.1016/S0301-6226(03)00003-4
Marcus E. Kehrli, Dale E. Shuster, Factors Affecting Milk Somatic Cells and Their Role in Health of the Bovine Mammary Gland Journal of Dairy Science. ,vol. 77, pp. 619- 627 ,(1994) , 10.3168/JDS.S0022-0302(94)76992-7
H.M. Nielsen, N.C. Friggens, P. Løvendahl, J. Jensen, K.L. Ingvartsen, Influence of breed, parity, and stage of lactation on lactational performance and relationship between body fatness and live weight Livestock Production Science. ,vol. 79, pp. 119- 133 ,(2003) , 10.1016/S0301-6226(02)00146-X
J.H.J. Van Der Werf, M.E. Goddard, K. Meyer, The Use of Covariance Functions and Random Regressions for Genetic Evaluation of Milk Production Based on Test Day Records Journal of Dairy Science. ,vol. 81, pp. 3300- 3308 ,(1998) , 10.3168/JDS.S0022-0302(98)75895-3
Y.H. Schukken, B.A. Mallard, J.C.M. Dekkers, K.E. Leslie, M.J. Stear, Genetic Impact on the Risk of Intramammary Infection Following Staphylococcus aureus Challenge Journal of Dairy Science. ,vol. 77, pp. 639- 647 ,(1994) , 10.3168/JDS.S0022-0302(94)76994-0
R.A Mrode, G.J.T Swanson, Estimation of genetic parameters for somatic cell count in the first three lactations using random regression Livestock Production Science. ,vol. 79, pp. 239- 247 ,(2003) , 10.1016/S0301-6226(02)00169-0