The non-linear effect (determined by the penalised partial-likelihood approach) of milk-protein concentration on time to first insemination in Belgian dairy cows

Preventive Veterinary Medicine

Volumn 68, Issue 2-4, 2005, Pages 81-90

  Duchateau, Luc ^a   Opsomer, Geert ^a   Dewulf, Jeroen ^a   Janssen, Paul ^b  

^a GHENT UNIVERSITY   (Belgium)

^b HASSELT UNIVERSITY   (Belgium)

Author keywords

Cubic splines; Dairy cows; Frailty model; Insemination; Milk protein; Penalised partial likelihood

Indexed keywords

EID: 16244371779     PISSN: 01675877     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.prevetmed.2004.11.012     Document Type: Article

References (19)

1. H. Akaike Information theory and an extension of the maximum likelihood principle B.N. Petrov F. Csáki Proceedings of the Second International Symposium on Inference Theory 1973 Akadémiai Kiadó Budapest 267 281
2. J.B. Coulon, and B. Remond Variations in milk output and milk protein content in response to the level of energy supply to the dairy cow: a review Livestock Production Science 29 1991 31 47
3. D.R. Cox Regression models and life tables (with Discussion) J. R. Stat. Soc. A 148 1972 82 117
4. M.J. de Vries, and R.F. Veerkamp Energy balance in dairy cattle in relation to milk production variables and fertility J. Dairy Sci. 83 2000 62 69
5. A.A. Dijkhuizen, R.B.M. Huirne, A.W. Jalvingh, and J. Stelwagen Economic impact of common health and fertility problems A.A. Dijkhuizen R.S. Moore Animal health economics, principles and applications 1997 University of Sydney 41 58
6. O. Distl, A. Wurm, G. Glibotic, G. Brem, and H. Krauslich Analysis of relationships between veterinary recorded production diseases and milk production in dairy cows Livestock Production Science 23 1989 67 78
7. L. Duchateau, P. Janssen, P. Lindsey, C. Legrand, R. Nguti, and R. Sylvester The shared frailty model and the power for heterogeneity tests in multicenter trials Comput. Stat. Data Anal. 40 2002 603 620
8. L. Duchateau, and P. Janssen Penalized partial likelihood for frailties and smoothing splines in time to first insemination models for dairy cows Biometrics 60 2004 608 614
9. J.D. Ferguson, and D.T. Galligan Proceedings of the 32nd Annual Conference of the American Association of Bovine Practitioners Veterinary reproductive programs Nashville, Tenessee 1999 131 137
10. R.J. Gray Flexible methods for analyzing survival data using splines, with applications to breast cancer prognosis JASA 87 1992 942 951
11. J. Haraszti, G. Huszenicza, L. Molnar, L. Solti, and L. Csernus Postpartal ovarian activity of healthy cows and those affected by subclinical metabolic disorders Anim. Reprod. Sci. 9 1985 67 78
12. C. Heuer, Y.H. Schukken, and P. Dobbelaar Postpartum body condition score and results from the first test day milk as predictors of disease, fertility, yield, and culling in commercial dairy herds J. Dairy Sci. 82 1992 295 304
13. G. Huszenicza, J. Haraszti, L. Molnar, L. Solti, S. Fekete, K. Ekes, and A.C. Yaro Some metabolic characteristics of dairy cows with different post partum ovarian function J. Vet. Med. A 35 1988 506 515
14. J.P. Klein Semiparametric estimation of random effects using the Cox model based on the EM algorithm Biometrics 48 1992 795 806
15. M.C. Lucy Reproductive loss in high-producing dairy cattle: where will it end? J. Dairy Sci. 84 2001 1277 1293
16. G. Opsomer, Y.T. Gröhn, J. Hertl, M. Coryn, and Deluyker H., de Kruif, A. Risk factors for postpartum ovarian dysfunction in high producing dairy cows in Belgium: a field study Theriogenology 53 2000 841 857
17. L.A. Sleeper, and D.P. Harrington Regression splines in the Cox model with application to covariate effects in liver disease JASA 85 1990 941 949
18. C.R. Staples, W.W. Thatcher, and J.H. Clark Relationship between ovarian activity and energy status during the early postpartum period of high producing dairy cows J. Dairy Sci. 73 1990 938 947
19. T.M. Therneau, and P.M. Grambsch Modeling survival data. Extending the Cox model 2000 Springer Verlag New York 231 260