Genetic improvement of feed efficiency of Norwegian Red cows

Offentlig prosjektsammendrag

The overall aim is to develop tools for selection of improved feed efficiency in Norwegian Red dairy cows. This will result in a more efficient production of milk and beef, better utilization of resources and reduced environmental impact, while maintaining a sustainable dairy production. Feed efficiency in dairy production can be improved genetically. However, direct recording of individual roughage feed intake in dairy cattle is challenging and costly. In this project we will therefore explore alternative methods. We aim to identify indirect measures that can be used to predict feed efficiency in dairy cattle large scale. A novel method based on content of stable isotopes in feed and milk will be tested and further developed for dairy cattle. Another option we will explore is to predict individual feed efficiency based on data available from automatic milking systems and relevant additional sensors (e.g. measures of activity, rumination, body condition). Before indirect measures and predictions can be considered used in the breeding program, knowledge of the association between direct and indirect measures is crucial. Equipment for measures of direct feed intake will therefore be installed in collaborating herds, and data from these herds will be used to develop and validate prediction equations. Breeding for improved feed efficiency can make Norwegian dairy production more sustainable. The effect of selection for feed efficiency will be modeled by life cycle assessment.