Twenty dual-purpose Simmental dairy cows were used in a 2 2 cross-over design to evaluate
the effects of feeding, both pelleted vs. ensiled grass clover and whole plant maize on feed intake,
milk production and composition, as well as on blood metabolites and some parameters of rumen
fermentation. In addition to the pelleted/ensiled forages, all animals were offered grass hay, and,
based on the individual milk performance prior to the beginning of the experiment, 1 kg of
concentrate for every 2.35 kg energy-corrected milk (ECM) exceeding a daily production of 15 kg
ECM. In both groups, the forage was offered so that grass hay, grass clover silage or pellets and
whole plant maize silage or pellets would contribute 100, 450 and 450 g kg
ÿ1 to total forage dry
matter intake (DMI), respectively. Both the treatment periods lasted for seven weeks. Average daily
forage DMI was increased from 12.8 up to 18.6 kg when grass clover and whole plant maize were
fed in the pelleted form. ECM production was elevated from 18.3 up to 20.3 kg (p < 0.001). Also, a
significant increase was observed for milk protein and lactose level, while content of milk fat and
concentration of milk urea were reduced. Rumen pH-values were significantly lower in the pelletfed
cows than in the silage-fed cows. The acetate to propionate ratio was narrowed down from
3.80 : 1 to 3.54 : 1. Concentration of blood serum urea was significantly reduced (0.8 mmol l
ÿ1)
when pellets were fed. Except for glutamate dehydrogenase (GlDH), all the liver specific enzymes
were within normal ranges. The analysis of glucose, protein and ketone bodies in the urine was
Twenty dual-purpose Simmental dairy cows were used in a 2 2 cross-over design to evaluatethe effects of feeding, both pelleted vs. ensiled grass clover and whole plant maize on feed intake,milk production and composition, as well as on blood metabolites and some parameters of rumenfermentation. In addition to the pelleted/ensiled forages, all animals were offered grass hay, and,based on the individual milk performance prior to the beginning of the experiment, 1 kg ofconcentrate for every 2.35 kg energy-corrected milk (ECM) exceeding a daily production of 15 kgECM. In both groups, the forage was offered so that grass hay, grass clover silage or pellets andwhole plant maize silage or pellets would contribute 100, 450 and 450 g kgÿ1 to total forage drymatter intake (DMI), respectively. Both the treatment periods lasted for seven weeks. Average dailyforage DMI was increased from 12.8 up to 18.6 kg when grass clover and whole plant maize werefed in the pelleted form. ECM production was elevated from 18.3 up to 20.3 kg (p < 0.001). Also, asignificant increase was observed for milk protein and lactose level, while content of milk fat andconcentration of milk urea were reduced. Rumen pH-values were significantly lower in the pelletfedcows than in the silage-fed cows. The acetate to propionate ratio was narrowed down from3.80 : 1 to 3.54 : 1. Concentration of blood serum urea was significantly reduced (0.8 mmol lÿ1)when pellets were fed. Except for glutamate dehydrogenase (GlDH), all the liver specific enzymeswere within normal ranges. The analysis of glucose, protein and ketone bodies in the urine was
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