The influence of physical form of ration on chewing activity and rumen motility in lactating cows. Received Nov. 4, 1988. Acta Agr. Scand. 39: 187-202, 1989.The effect of the physical form of diet on chewing activity and rumen motility uas investigated in a study with 3 lactating cows using two 3x3 Latin square blocks with 3 experimental periods per block and 3 physical forms of the rations by means of different contents of long barley straw (LS): 4 % LS, 10% LS and 20% LS. The rations consisted of long barley straw and pelleted fed in different proportions. All rations consisted of 80% concentrate mixture and 20% barley straw in either long or ground and pelleted physical form. The rations were fed restrictively every second hour throughout the experiment. The dry matter intake \MS adjusted to 16 kg daily and the content of nutrients was according to Danish Standards for 24 kg 4% FChl. The motility of the rumen was recorded by use of a pressure transducer in the reticulo-rumen, and the pattern of contractions \\as used for determination of the chewing activity. An increase in the content of LS from 4 to 20% led to linear increases in the time spent eating from 83 to 1 0 1 midday (p
Research, 25 Rolighedsvej, DK-1958 Frederiksberg C, Denmark). Reticulo-rumen fermentation in dairy cows fed 12 times daily with 4 types of roughages supplemented with straw and concentrates. Received Jan. 26, 1987. Acta Agric. Scand. 37:449461, 1987.The aim of the experiment was to compare the effect of the roughage type on the reticulorumen fermentation when included in rations having the same physical properties expressed as chewing time and the same content of energy. The design of the experiment was a 4 x 4 latin square with 4 types of roughages and 4 dairy cows fed 3 times maintenance. The 4 roughages compared, \\'ere fodder sugar beet, beet top silage, beet pulp silage and grass silage. Each ration contained about 6 kg dry matter of one of the 4 roughages. The rations were balanced to the same chewing time of 800 min daily with ammonia-treated barley straw and to the same nutrient content by means of selected concentrates. The cows were fed every 2 hours. The rumen fluid samples were taken at 08.00, 12.00 and 18.00 hours for determination of the content of volatile fatty acids (VFA), ammonia nitrogen and pH. The four experimental cows differed in terms of the concentration of propionate (p
The influence of the physical form of the diet on fluid dynamics and mineral content of rumen fluid in lactating cows fed 12 times daily. Received hiay 24, 1989. Acta Agric. Scand. 39: 431440, 1989.The effect of the physical form of the diet on liquid metabolism, osmotic pressure, and the macromineril concentrations in the rumen fluid \\as investigated in a study with 3 lactating cows. Two 3 x 3 Latin square blocks were used, with 3 physical forms of rations, made by adding different amounts of long straw (LS), 4%, 10%. and 20%. All rations consisted of pelleted feed and barley straw fed in either a long or in a ground and pelleted physical form. The rations were fed restrictively every second hour day and night throughout the experiment. Energy, organic nutrients and macrominerals were supplied in amounts corresponding to Danish Standards for cows yielding 24 kg 4% FChI. Increasing the content of LS from 4 % to 20% resulted in significant linear increase in the outflow of liquid from the rumen (p<0.002), liquid dilution rate (p
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