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Effect of dose of thymol and supplemental flavours or camphor on palatability in a choice feeding study with piglets

Joris Michiels UGent, Joris Missotten UGent, Anneke Ovyn UGent, Noël Dierick UGent, Dirk Fremaut UGent and Stefaan De Smet UGent (2012) CZECH JOURNAL OF ANIMAL SCIENCE. 57(2). p.65-74
abstract
Thymol's antimicrobial properties urged researchers to study its effect on animal performance and intestinal health in pigs. However, thymol has the characteristic sharp odor of thyme and a bitter, aromatic, and sometime:; burning sensation which may elicit feeding aversions. The objectives in the current study were: (1) to determine the effect of dose of thymol and camphor on palatability and (2) to test the hypothesis that supplemental flavours or camphor, the latter as a known Transient Receptor Potential A1 blocker, could mitigate feed avoidance caused by thymol. Two analogous choice-feeding trials were conducted. Feed intake of the test diet was expressed as proportion of the total intake and tested by means of a one-sample Student's t-test against a set value of 50%. The preference for feed supplemented with 125, 500, 1250 and 2000 mg/kg thymol was 53.7 +/- 6.0% (P > 0.05), 47.5 +/- 5.1% (P > 0.05), 36.8 +/- 4.9% (P = 0.022), and 3.9 +/- 7.9% (P = 0.005) respectively. When feed containing 2000 mg/kg thymol with either flavour A (containing intense sweeteners) or flavour B (containing the same intense sweeteners and a caramel aroma) was opposed against a control diet, the relative intake of the test diets was 19.9 +/- 5.8% and 14.0 +/- 4.9% (both P < 0.05) respectively. When animals were offered one of these test diets and a reference diet with 2000 mg/kg thymol, animals exhibited a preference for the feed with 2000 mg/kg thymol + flavour A, but not for the feed with 2000 mg/kg thymol + flavour B. Thus, supplemental flavours containing intense sweeteners partially overcame feed avoidance caused by thymol which was less pronounced when the caramel aroma was present. Exposure to camphor (50 and 200 mg/kg) did not improve feed preference for a diet containing 1250 mg/kg thymol. Thymol's bitter taste might be largely responsible for the recorded feed refusal at high inclusion rates.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
TRPA1, aroma, palatability, feed intake, pig, ANTIMICROBIAL ACTIVITY, WEANLING PIGS, TRP CHANNELS, CARVACROL, CINNAMALDEHYDE, PERFORMANCE, ADDITIVES, ACTIVATE, BACTERIA, MENTHOL, thymol, flavour, camphor
journal title
CZECH JOURNAL OF ANIMAL SCIENCE
Czech J. Anim. Sci.
volume
57
issue
2
pages
65 - 74
Web of Science type
Article
Web of Science id
000301618700003
JCR category
AGRICULTURE, DAIRY & ANIMAL SCIENCE
JCR impact factor
0.922 (2012)
JCR rank
24/54 (2012)
JCR quartile
2 (2012)
ISSN
1212-1819
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
3009231
handle
http://hdl.handle.net/1854/LU-3009231
date created
2012-10-09 09:00:37
date last changed
2012-10-12 08:49:06
@article{3009231,
  abstract     = {Thymol's antimicrobial properties urged researchers to study its effect on animal performance and intestinal health in pigs. However, thymol has the characteristic sharp odor of thyme and a bitter, aromatic, and sometime:; burning sensation which may elicit feeding aversions. The objectives in the current study were: (1) to determine the effect of dose of thymol and camphor on palatability and (2) to test the hypothesis that supplemental flavours or camphor, the latter as a known Transient Receptor Potential A1 blocker, could mitigate feed avoidance caused by thymol. Two analogous choice-feeding trials were conducted. Feed intake of the test diet was expressed as proportion of the total intake and tested by means of a one-sample Student's t-test against a set value of 50\%. The preference for feed supplemented with 125, 500, 1250 and 2000 mg/kg thymol was 53.7 +/- 6.0\% (P {\textrangle} 0.05), 47.5 +/- 5.1\% (P {\textrangle} 0.05), 36.8 +/- 4.9\% (P = 0.022), and 3.9 +/- 7.9\% (P = 0.005) respectively. When feed containing 2000 mg/kg thymol with either flavour A (containing intense sweeteners) or flavour B (containing the same intense sweeteners and a caramel aroma) was opposed against a control diet, the relative intake of the test diets was 19.9 +/- 5.8\% and 14.0 +/- 4.9\% (both P {\textlangle} 0.05) respectively. When animals were offered one of these test diets and a reference diet with 2000 mg/kg thymol, animals exhibited a preference for the feed with 2000 mg/kg thymol + flavour A, but not for the feed with 2000 mg/kg thymol + flavour B. Thus, supplemental flavours containing intense sweeteners partially overcame feed avoidance caused by thymol which was less pronounced when the caramel aroma was present. Exposure to camphor (50 and 200 mg/kg) did not improve feed preference for a diet containing 1250 mg/kg thymol. Thymol's bitter taste might be largely responsible for the recorded feed refusal at high inclusion rates.},
  author       = {Michiels, Joris and Missotten, Joris and Ovyn, Anneke and Dierick, No{\"e}l and Fremaut, Dirk and De Smet, Stefaan},
  issn         = {1212-1819},
  journal      = {CZECH JOURNAL OF ANIMAL SCIENCE},
  keyword      = {TRPA1,aroma,palatability,feed intake,pig,ANTIMICROBIAL ACTIVITY,WEANLING PIGS,TRP CHANNELS,CARVACROL,CINNAMALDEHYDE,PERFORMANCE,ADDITIVES,ACTIVATE,BACTERIA,MENTHOL,thymol,flavour,camphor},
  language     = {eng},
  number       = {2},
  pages        = {65--74},
  title        = {Effect of dose of thymol and supplemental flavours or camphor on palatability in a choice feeding study with piglets},
  volume       = {57},
  year         = {2012},
}

Chicago
Michiels, Joris, Joris Missotten, Anneke Ovyn, Noël Dierick, Dirk Fremaut, and Stefaan De Smet. 2012. “Effect of Dose of Thymol and Supplemental Flavours or Camphor on Palatability in a Choice Feeding Study with Piglets.” Czech Journal of Animal Science 57 (2): 65–74.
APA
Michiels, J., Missotten, J., Ovyn, A., Dierick, N., Fremaut, D., & De Smet, S. (2012). Effect of dose of thymol and supplemental flavours or camphor on palatability in a choice feeding study with piglets. CZECH JOURNAL OF ANIMAL SCIENCE, 57(2), 65–74.
Vancouver
1.
Michiels J, Missotten J, Ovyn A, Dierick N, Fremaut D, De Smet S. Effect of dose of thymol and supplemental flavours or camphor on palatability in a choice feeding study with piglets. CZECH JOURNAL OF ANIMAL SCIENCE. 2012;57(2):65–74.
MLA
Michiels, Joris, Joris Missotten, Anneke Ovyn, et al. “Effect of Dose of Thymol and Supplemental Flavours or Camphor on Palatability in a Choice Feeding Study with Piglets.” CZECH JOURNAL OF ANIMAL SCIENCE 57.2 (2012): 65–74. Print.