Back
Full-text
Journal article

Hydrolysable tannin-based diet rich in gallotannins has a minimal impact on pig performance but significantly reduces salivary and bulbourethral gland size.

  • Bee G 1Agroscope Posieux,Tiolyere 4,1725 Posieux,Switzerland.
  • Silacci P 1Agroscope Posieux,Tiolyere 4,1725 Posieux,Switzerland.
  • Ampuero-Kragten S 1Agroscope Posieux,Tiolyere 4,1725 Posieux,Switzerland.
  • Čandek-Potokar M 2Agricultural Institute of Slovenia,Hacquetova ulica 17,1000 Ljubljana,Slovenia.
  • Wealleans AL 1Agroscope Posieux,Tiolyere 4,1725 Posieux,Switzerland.
  • Litten-Brown J 3Department of Agriculture,University of Reading,Reading RG6 6AR,UK.
  • Salminen JP 4Department of Chemistry,University of Turku,20500 Turku,Finland.
  • Mueller-Harvey I 3Department of Agriculture,University of Reading,Reading RG6 6AR,UK.
Show more…
  • 2016-12-23
Published in:
  • Animal : an international journal of animal bioscience. - 2017
boar taint
growth performance
meat quality
pigs
tannins
Adipose Tissue
Androstenes
Animals
Bulbourethral Glands
Cytochrome P-450 Enzyme System
Diet
Hydrolyzable Tannins
Indoles
Male
Odorants
Phenotype
Red Meat
Salivary Glands
Skatole
Swine
English Tannins have long been considered 'anti-nutritional' factors in monogastric nutrition, shown to reduce feed intake and palatability. However, recent studies revealed that compared with condensed tannins, hydrolysable tannins (HT) appear to have far less impact on growth performance, but may be inhibitory to the total activity of caecal bacteria. This in turn could reduce microbial synthesis of skatole and indole in the hindgut of entire male pigs (EM). Thus, the objective of this study was to determine the impact of a group of dietary HT on growth performance, carcass traits and boar taint compounds of group housed EM. For the study, 36 Swiss Large White boars were assigned within litter to three treatment groups. Boars were offered ad libitum one of three finisher diets supplemented with 0 (C), 15 (T15) or 30 g/kg (T30) of HT from day 105 to 165 of age. Growth performance, carcass characteristics, boar taint compounds in the adipose tissue and cytochrome P450 (CYP) isoenzymes CYP2E1, CYP1A2 and CYP2A19 gene expression in the liver was assessed. Compared with C, feed efficiency but not daily gain and daily feed intake was lower (P<0.05) in T15 and T30 boars. Except for the percentage carcass weight loss during cooling, which tended (P<0.10) to be greater in T30 than C and T15, carcass characteristics were not affected by the diets. In line with the numerically lower androstenone level, bulbourethral and salivary glands of T30 boars were lighter (P<0.05) than of T15 with intermediate values for C. Indole level was lower (P<0.05) in the adipose tissue of T30 than C pigs with intermediate levels in T15. Skatole levels tended (P<0.10) to be lower in T30 and C than T15 pigs. Hepatic gene expression of CYP isoenzymes did not differ between-treatment groups, but was negatively correlated (P<0.05) with androstenone (CYP2E1 and CYP1A2), skatole (CYP2E1, CYP2A) and indole (CYP2A) level. In line with the numerically highest androstenone and skatole concentrations, boar taint odour but not flavour was detected by the panellists in loins from T15 compared with loins from C and T30 boars. These results provide evidence that HT affected metabolism of indolic compounds and androstenone and that they affected the development of accessory sex glands. However, the effects were too small to be detected by sensory evaluation.
Language
  • English
Open access status
hybrid
Identifiers
Persistent URL
https://sonar.ch/global/documents/31018
Statistics
Document views: 58 File downloads:
  • Full-text: 0