A structural equation model for describing relationships between somatic cell score and milk yield in dairy goats

Journal of Animal Science

Volumn 84, Issue 11, 2006, Pages 2934-2941

  De Los Campos, G ^a   Gianola, D ^a,b,c   Boettcher, P ^d   Moroni, P ^e  

^a UNIVERSITY OF WISCONSIN MADISON   (United States)

^b UNIVERSITY OF WISCONSIN SCHOOL OF MEDICINE AND PUBLIC HEALTH   (United States)

^c NORWEGIAN UNIVERSITY OF LIFE SCIENCES   (Norway)

^d CNR   (Italy)

^e UNIVERSITY OF MILAN   (Italy)

Author keywords

Goat; Intramammary infection; Simultaneity of effects; Structural equation model

Indexed keywords

ANIMAL; ANIMAL DISEASE; ARTICLE; BIOLOGICAL MODEL; CELL COUNT; CYTOLOGY; FEMALE; GOAT; GOAT DISEASE; LACTATION; MASTITIS; MILK; PHYSIOLOGY;

ANIMALS; CELL COUNT; FEMALE; GOAT DISEASES; GOATS; LACTATION; MASTITIS; MILK; MODELS, BIOLOGICAL;

CAPRA HIRCUS;

EID: 33750595459     PISSN: 00218812     EISSN: None     Source Type: Journal    
DOI: 10.2527/jas.2006-016     Document Type: Article

References (22)

1. Aleandri, M., A. Fagiolo, P. Calderini, R. Colafrancesco, G. Giangolini, R. Rosati, and F. De Michelis. 1996. Studies conducted on somatic cells count of goat milk. Proc. Int. Symp. Somatic Cells and Milk of Small Ruminants, Bella, Italy. EAAP 77:65-70.
2. Ali, A. K. A., and G. E. Shook. 1982. An optimum transformation for somatic cell concentration in milk. J. Dairy Sci. 63:487-490.
3. Alwing, D. F., and R. M. Hauser. 1975. The decomposition of effects in path analysis. Am. Sociol. Rev. 40:37-47.
4. Contreras, A., J. C. Corrales, A. Sánchez, D. Sierra, and J. C. Marco. 1996. Factors affecting milk somatic cell counts in Murciano-Granadina goats. Proc. Int. Symp. Somatic Cells and Milk of Small Ruminants, Bella, Italy. EAAP 77:173-176.
5. Corrales, J. C., A. Sánchez, D. Sierra, J. C. Marco, and A. Contreras. 1996. Relationship between somatic cell counts and intra-mammary pathogens in goats. Proc. Int. Symp. Somatic Cells and Milk of Small Rumin., Bella, Italy. EAAP 77: 89-92.
6. de Haas, Y. 2003. Somatic cell count patterns Improvement of udder health by genetics and management. Ph.D. Diss. Animal Breeding and Genetics, Wageningen University, Wageningen and Division of Animal Resources Development, Animal Sciences Group, Lelystad, the Netherlands.
7. Eitam, M., and M. Eitam. 1996. Direct and indirect detection of intramammary infection of the lactating ovine mammary gland. Proc. Int. Symp. Somatic Cells and Milk of Small Ruminants, Bella, Italy. EAAP 77:15-19.
8. Gianola, D., and D. Sorensen. 2004. Quantitative genetics models for describing simultaneous and recursive relationship between phenotypes. Genetics 167:1407-1424.
9. Gonzalo, C., A. Ariznabarreta, J. A. Carriedo, and F. San Primitivo. 2002. Mammary pathogens and their relationship to somatic cell count and milk yield losses in dairy ewes. J. Dairy Sci. 85:1460-1467.
10. Jöreskog, K., and D. Sörbom. 2003. LISREL© 8: User's Reference Guide. Scientific Software International.
11. Kosev, K., S. Txolov, S. Denev, M. Vitkov, and M. Koleva. 1996. Influence of the different forms of udder inflammation and the species of microbial agents on the somatic cell count in goat milk. Proc. Int. Symp. Somatic Cells and Milk of Small Ruminants, Bella, Italy. EAAP 77:107-109.
12. Mavrogenis, A. P., and C. Papachristoforou. 2000. Genetic and phenotypic relationships between milk production and body weight in Chios sheep and Damascus goats. Livest. Prod. Sci. 67:81-87.
13. Moroni, P., F. Pisoni, G. Ruffo, and P. J. Boettcher. 2005a. Risk factors for intra-mammary infections and relationship with somatic cell counts in Italian dairy goats. Prev. Vet. Med. 69:163-173.
14. Moroni, P., G. Pisoni, C. Vimercati, M. Rinaldi, B. Castiglioni, P. Cremonesi, and P. Boettcher. 2005b. Characterization of Staphylococcus aureus isolated from chronically infected dairy goats. J. Dairy Sci. 88:3500-3509.
15. Peris, C., J. R. Díaz, N. Fernández, and M. Rogriguez. 1996. Effects of subclinical mastitis on milk yield in Manchega ewes: Preliminary results. Proc. Int. Symp. Somatic Cells and Milk of Small Rumin., Bella, Italy. EAAP 77:203-206.
16. Raftery, A. E. 1995. Bayesian Model Selection in Social Research. Pages 111-195 in Peter V. Marsden, ed. Sociological Methodology. Basil Blackwell, Cambridge, UK.
17. Rodriguez-Zas, S. D., D. Gianola, and G. Shook. 2000. Evaluation of models for somatic cell score lactation patterns in Holsteins. Livest. Prod. Sci. 67:19-30.
18. Rota, A. M., C. Gonzalo, P. L. Rodriguez, A. I. Rojas, L. Martín, and J. J. Tovar. 1993. Effects of stage of lactation and parity on somatic cell counts in milk of Verata goats and algebraic models for their lactation curves. Small Rumin. Res. 12:211-219.
19. Sánchez, A., A. Contreras, and J. C. Corrales. 1999. Parity as a risk factor for caprine subclinical intra-mammary infection. Small Rumin. Res. 31:197-201.
20. Schwartz, G. 1978. Estimating the dimension of a model. Ann. Statist. 6:461-464.
21. Wilson, D. J., K. N. Stewart, and P. M. Sears. 1995. Effects of stage of lactation, production, parity and season on somatic cell counts in infected and uninfected dairy goats. Small Rumin. Res. 16:165-169.
22. Zeng, S. S., and E. N. Escobar. 1995. Effect of parity and milk production on somatic cell count, standard plate count and composition of goat milk. Small Rumin. Res. 17:269-274.