Schneider, Maria Del Pilar
- Institutionen för husdjurens biovetenskaper, Sveriges lantbruksuniversitet
Sammanfattning
The objective of this research was to study whether survival analysis results in a more accurate genetic evaluation for female fertility traits compared with the usual methodology based on linear models. The fertility trait studied was interval between calving and last insemination. A stochastic simulation describing the reproductive cycle of first-parity cows was done, in which true breeding values for conception rate were created. A model containing effects of sire and herd was used both with survival analysis and with mixed linear model analysis to predict sire breeding values. Correlations between true breeding values for conception rate and breeding values for calving to last insemination predicted by the best survival analysis model or the best linear model were 0.77 and 0.68, respectively. The results showed that when pregnancy status is known, survival analysis is a better method than linear models for genetic evaluation of conception rate when using observations on the interval between calving and last insemination.
Nyckelord
female fertility; genetic evaluation; survival analysis
Publicerad i
Journal of Dairy Science
2005, volym: 88, nummer: 6, sidor: 2253-2259
Utgivare: AMER DAIRY SCIENCE ASSOC
SLU författare
Strandberg, Erling
- Institutionen för husdjurens biovetenskaper, Sveriges lantbruksuniversitet
- Institutionen för husdjurens biovetenskaper, Sveriges lantbruksuniversitet
UKÄ forskningsämne
Veterinärmedicin
Husdjursvetenskap
Publikationens identifierare
- DOI: https://doi.org/10.3168/jds.S0022-0302(05)72901-5
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/7454