Non-structural carbohydrates in the nutrition of high-yielding dairy cows during a transition period
2010
Polakova, K.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Kudrna, V.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Kodes, A.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Mikrobiologie, Vyzivy a Dietetiky | Hucko, B.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Mikrobiologie, Vyzivy a Dietetiky | Mudrik, Z.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Mikrobiologie, Vyzivy a Dietetiky
The main aim of this study was to investigate the effect of different compositions of non-structural carbohydrates (NFC) in feed rations administered to high-yielding dairy cows on dry matter intake both before and after parturition and on subsequent milk performance, body condition and physiological traits of rumen fluid and blood. Thirty-six cows were allocated into one of the three well-balanced groups (K, O, and C). Feeding rations differed in non-structural carbohydrate (NFC) structure. The K (control) group received a feeding ration with NFC in the form of maize starch, the O group received besides maize starch saccharose from dried sugar beet, the C group received a dominant amount of NFC in the form of saccharose. After calving, all dairy cows were given the same feeding ration from the first day after parturition. The experiment was conducted for 21 days before and 50 days after calving. Dry matter intake, milk performance, body condition, live weight, and blood and rumen parameters were recorded. The average daily dry matter intake before calving was highest in the K group (14.32 kg per head). Differences among groups were significant. Prepartum dry matter consumption dropped as the rate of saccharose in the diet of cows increased. Dry matter consumption increased after calving. Milk yield was also highest in the K group (43.71 kg/head/day), but fatness of milk and thus the production of fat corrected milk were lowest. The highest milk fat content (4.10%) and fat corrected milk production (44.03 kg/head/day) were recorded in the C group, whereas the highest milk protein concentration was found in the milk of the O group. The composition of NFC affected dry matter intake before parturition.
显示更多 [+] 显示较少 [-]