THE INFLUENCE OF NUTRIENTS CONTENT IN PASTURE ON AMINO ACIDS CONTENT OF COWS MILK

Abstract

The chemical composition of milk and its relation to grazing is emphasized in lowinput breeding systems where generally lower milk production use to be achieved. The aim of this study was to evaluate the milk composition of Czech Pied and Holstein cows during 6-months grazing period in comparison to winter silage-based breeding on three sub-mountain farms. The individual 24-hours milk yields and concentrations of fat, protein and somatic cell counts (SCC) were measured monthly in a total of 671 Czech Pied and 114 Holstein cows during 6-years period. Cows belonged to two Czech Pied herds, offered 7-hours (Farm 1, F1) or 20-hours (Farm 2, F2) daily grazing allowance, and to a mixed Czech Pied and Holstein herd (Farm 3, F3) offered 20-hours pasture acces. The data of each herd were evaluated separately allowing to the season (grazing, housing) and the breed. A significant enhancement of fat yields was found during grazing season in all three herds and in both the breeds. The higher protein yields in grazing seasons were found in F2, F3, whereas no difference to housing season was found in F1. These results indicate the positive effect of longterm acces to pasture on the fat and protein milk yields without significant enhancement of SCC on the surveyed farms. This project by MSM 6007665806 was supported.

Keywords

• pasturage
• cattle
• czech pied cattle
• holstein cattle
• milk performance