Relationships of fatty acid group contents in milk and reproductiveperformance in Holstein cows

Authors : Jaromネr DUCHÁCEK, Jan BERAN, Martin PTÁCEK, Ludek STÁDNÍK, Monika OKROUHLA, Renata TOUSOVÁ, Martina DOLEZALOVA

Pages : 357-363

Doi:10.3906/vet-1411-43

View : 18 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The aim of this study was to evaluate the relationships between milk fatty acid group contents and subsequent reproductive performance in Holstein cows. A total of 27 cows in the 1st to 4th lactations were included in the evaluation. Cows were divided into primiparous and multiparous groups. Daily milk yields increased in the first 8 weeks of lactation. Body condition score decreased until the third month of lactation. As the cows gradually recovered from the negative energy balance, the contents of saturated fatty acids insert ignore into journalissuearticles values(SFAs); increased, whereas the contents of monounsaturated fatty acids insert ignore into journalissuearticles values(MUFAs); and polyunsaturated fatty acids insert ignore into journalissuearticles values(PUFAs); decreased. The contents of SFAs and MUFAs were significantly insert ignore into journalissuearticles values(P < 0.01-0.05); correlated insert ignore into journalissuearticles values(r = -0.279 to r = 0.275); with all the reproductive traits evaluated insert ignore into journalissuearticles values(calving to first insemination interval, days open, and insemination index);. PUFA was only correlated insert ignore into journalissuearticles values(P < 0.01); with calving to first insemination interval insert ignore into journalissuearticles values(r = -0.141);. High milk SFA contents were associated with improved values of days open and insemination index, whereas opposite tendencies were observed for MUFA. It was concluded that the relationship was confirmed between the changes of different milk fatty acid group contents in early lactation, used as negative energy balance indicators, and subsequent reproduction results.
Keywords : Days open, fatty acids, negative energy balance, insemination interval, insemination index