ORIGINAL PAPER
Gut morphology of young pigs fed diets differing in standardized ileal digestible threonine and wheat gluten used as a source of non-essential amino acids
1
The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Instytucka 3, 05-110 Jabłonna, Poland
Publication date: 2016-08-25
Corresponding author
E. Święch
The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Instytucka 3, 05-110 Jabłonna, Poland
The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Instytucka 3, 05-110 Jabłonna, Poland
J. Anim. Feed Sci. 2016;25(3):226-234
KEYWORDS
ABSTRACT
The aim of the study was to determine whether non-essential
amino acids (NEAA) in form of wheat gluten (WG) have a threonine (Thr)-
sparing effect on gut structure in young pigs. A two-factorial experiment was
conducted on 12 groups of 6 pigs. Pigs of 12.5 kg initial body weight (BW) were
fed for about 20 days diets differing in the Thr level (5.1, 5.7, 6.3 and 6.9 g
standardized ileal digestible Thr · kg–1) and WG level (20.4, 40.4 and 60.4 g of
WG protein · kg–1 of respective WG20, WG40 and WG60 diets). After slaughter
at about 22.4 kg of BW, samples of duodenum, middle jejunum, ileum and
proximal colon were taken for histological analysis. Morphology of all segments
was not affected neither by Thr level nor by Thr and WG levels interaction,
whereas effect of WG level differed among segments. In the duodenum, villi
length and tunica mucosa thickness were decreased by WG60. In the duodenum
and proximal colon, crypt depth was greater in WG20 than WG60 and/or
WG40 groups, whereas in the ileum was greater in WG60 than WG20 group,
and in the middle jejunum it was not affected. Villi length : crypt depth ratio was
affected by WG only in the ileum, being greater in WG20 group. Myenteron was
thicker in the ileum and proximal colon in WG60 than WG20 and WG40 group,
respectively. The results do not evidence a sparing effect of NEAA provided by
WG on Thr utilization for maintaining the proper gut structure in young pigs.
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