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Passage and rumination of inert particles varying in size and specific gravity as determined from analysis of faecal appearance using multicompartment models

Published online by Cambridge University Press:  09 March 2007

M. R. Murphy ,
P. M. Kennedy  and
J. G. Welch
M. R. Murphy
Affiliation:
CSIRO Division of Tropical Animal Production, Davies Laboratory, Private Mail Bag, Aitkenval, Queensland 4814, Australia
P. M. Kennedy
Affiliation:
CSIRO Division of Tropical Animal Production, Davies Laboratory, Private Mail Bag, Aitkenval, Queensland 4814, Australia
J. G. Welch
Affiliation:
CSIRO Division of Tropical Animal Production, Davies Laboratory, Private Mail Bag, Aitkenval, Queensland 4814, Australia
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Abstract

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Plastic particles of defined length (2, 5 mm) and specific gravity (sp.gr. 1.10, 1.34, 1.77) were administered just before feeding into the reticulo-rumen of four cattle and four swamp buffaloes given a diet predominantly of rice straw ad lib. Simultaneously, doses of ground rice straw marked with Cr and Yb were likewise given. Plastic particles were recovered from faeces for 12 d after dosing, and divided into non-ruminated (NR) and ruminated (R) particles. Excretion data of plastic particles were interpreted using a four-pool model incorporating passage of NR (kp) and R from the reticulo-rumen, post-ruminal passage, rate of chewing (kr) and two lag times. An inverse relationship was found between kr and sp.gr. The kr was higher for 5 mm than that for 2 mm particles. In contrast, kp was greatest for particles of sp.gr. 1.34, with higher kp for 2 mm than for 5 mm particles. Rates of passage and rumination (kp, kr) were higher for buffaloes than for cattle. Rumination time was related to kr, most highly (r2 0.96) with kr of 2 mm, 1.10 sp.gr. particles. Fragmentation of 5 mm particles by rumination tended to increase the rate of passage from the rumen. Ruminal passage rates of Yb and Cr markers were poorly correlated with each other and with kp of any of the plastic markers. Reanalysis of published data from plastic particle studies supported the relationships between sp.gr., size, kp and kr. In view of the additional information (kr) obtained using plastic particles, we suggest their use may be appropriate in studies which investigate specific differences in digestive function, while being less suitable for investigating differences between diets.

Keywords

Plastic particle markersRumination ratesSpecific gravityCowBuffalo
Type
Rumen Physiology and Digestion
Information
British Journal of Nutrition , Volume 62 , Issue 2 , September 1989 , pp. 481 - 492
Copyright
Copyright © The Nutrition Society 1989

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