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- W1982252711 abstract "Abstract Five rumen fistulated male sheep were fed with isonitrogeneous diets varying in the straw-to-concentrate ratio ( 80:20, 65:35, 50:50, 35:65 and 20:80; diets I–V, Experiment 1). Single feeds (wheat straw, ground barley, protein-mineral-vitamin premix), as well as samples of all five diets with the corresponding straw-to-concentrate mixtures were incubated in nylon bags in the rumen of sheep for 3, 6, 12, 24, 48, 72 and 96 h. Washing loss of feeds and mixtures was measured. In the second experiment, five growing bulls and five castrated male sheep were individually fed with the same diets mentioned above in a 5 × 5 Latin-square design. Each diet was fed to all animals ad libitum over 30 days and limited (maintenance level) over 25 days. During the last 10 days of each period, the apparent digestibility (AD) of diets was determined. Dry matter degradability (DMD) of straw depended on incubation time and diet. After 48 h incubation, DMD of straw amounted to 50.7%; 47.4%; 47.1%; 39.8% and 29.2% when sheep were fed diets I–V, respectively. After 96 h incubation time there were no differences in straw DMD between 80% and 35% straw in the diet, but DMD was significantly lower when only 20% straw was fed. Concentrate DMD was not significantly influenced by type of feeding. The DMD of mixtures calculated from individual feeds correlated with r = 0.99 to the measured values. DMD of feed combinations was enhanced with increased concentrate portion and longer incubation time. Degradation curves of mixtures rich in concentrates were better described by using a modified degradation equation (DMD = a + b1(1 − e−c1t) + b2(1 − e−c2t)) expressing the rapidly (b1, c1) and slowly (b2, C2) degradable fractions. The DMD of the feed combinations could be predicted from the degradability of single feeds. Dry matter intake (DMI) of cattle increased from 4.38 and 5.03, 5.97 to 6.78 kg day−1 (I–IV) and decreased to 6.36 kg day−1 (V). Sheep consumed 1.07 1.35, 1.63, 1.75 and 1.82 kg DM day−1 (I–V) when fed ad libitum. Apparent digestibility of organic matter (ADOM) of restrictively fed animals was 63.3%, 67.5%, 71.1%, 76.9% and 80.2% in cattle for the diets I–V respectively and 65.0%, 66.0%, 72.3%, 75.7% and 81.4% in sheep (I–V). Correlation of ADOM between cattle and sheep was r = 0.95. On average, ADOM of ad libitum-fed animals was about 4% lower than that of restrictively fed cattle and sheep (cattle: 58.5%, 66.9%, 74.2%, 73.1% and 69.7%; sheep: 62.8%, 62.4%, 68.9%, 72.3% and 74.2% for I–V respectively). Apparent crude fibre digestibility was not significantly influenced by diet in restrictively fed animals (-0.1% per 1% concentrate), but it decreased significantly with higher concentrate portion in ad libitum-fed animals (-.45% per 1% concentrate). There was a closed correlation (r=0.91) between ADOM of restrictively fed sheep and the in sacco DM degradabilily of total diets after 48 h rumen incubation time. Diets II, III and IV showed the best agreement." @default.
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- W1982252711 date "1992-08-01" @default.
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- W1982252711 title "Influence of various straw-to-concentrate ratios on in sacco dry matter degradability, feed intake and apparent digestibility in ruminants" @default.
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- W1982252711 doi "https://doi.org/10.1016/0377-8401(92)90103-d" @default.
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