Passage of large plastic particles through the digestive tract of lactating and dry cows
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Research Institute of Animal Nutrition, Ltd. Videňská 699, 691 23 Pohořelice, Czech Republic
Mendel University of Agriculture and Forestry Zeměděská 1, 613 00 Brno, Czech Republic
Central Institute for Supervising and Testing in Agriculture Jaselská 16, 746 01 Opava, Czech Republic
Publication date: 1999-03-19
J. Anim. Feed Sci. 1999;8(2):263-272
In five trials carried out on two lactating and two dry cows three sets of particle sizes were used: in the first set particles with a diameter of 9 mm and length of 4, 6, 8 and 10 mm, in the second set particle sizes of 8/8,11/11,14/14 and 17/17 (diameter/length) mm, and the third set 8/8,9/9,10/10,11/ 11 and 12/12 mm particles. In the first set the lactating cows had a significantly higher mean recovery (97.8 vs 75.9 %) and a significantly shorter total tract mean retention time (TMRT) (53.0 vs 96.6 h) than the dry cows (P<0.05). In the second trial with lactating cows the main differences in recovery were found between 11/11 and 14/14 mm particles, significant at 48 h after administration (63.8 vs 31.3 %; P<0.05). Regurgitation of 17/17 mm particles was 27.5 % in lactating cows and 80% in dry cows in the course of 384 h. In the third set did not yield significant results, except 36 h (P<0.05) after placing. It is concluded that relatively good recovery and TMRT can be achieved in lactating cows with plastic particles of a size larger than 11/11 mm but smaller than 14/14 mm.
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