The shuttle is almost similar to the seed, the rapeseed, the difference is in the flavor more bitter. The seed shuttle is rich in protein and conducive to the improvement of the singing, it is so interesting during the breeding season in the canaries. However, as this seed is quite oily, we recommend that you do not exceed 10% of your mixture by shuttle bus to canary color or canaries of posture. For the singing canaries, the shuttle softens the song, and can therefore be used to 30 % the mixture : we recommend in this case to accompany the diet of your bird by a hepatic support.