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Cited by 5Ruminant Nutrition and Digestive PhysiologyAnimal Nutrition and PhysiologyCrop Yield and Soil Fertility

The effect of dent versus flint maize genotype on site and the extent of starch and protein digestion, ruminal fermentation and microbial protein synthesis in the rumen of sheep

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Verbic, Jože, Babnik, Drago, Žnidaršic-Pongrac, Vida, Resnik, Mojca, Gregorcic, Ana, Kmecl, Veronika·2005·Animal Research
DOI 10.1051/animres:2005034
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Abstract

Ruminal and whole tract digestibility of protein and starch, microbial protein yield in the rumen and molar proportions of volatile fatty acids (VFA) in the rumen fluid and faeces were determined in sheep that were given either maize silage derived from the dent (DTS) or flint type hybrid (FTS).Degradabilities in the rumen were determined by means of the in sacco method using three sheep and microbial protein yield in the rumen by means of urinary purine derivative excretion using four sheep.The extent of starch and protein degradation was significantly (P < 0.001) lower in FTS than in DTS (718 vs. 913 and 704 vs. 767 g•kg -1 respectively).Differences in whole tract starch and protein digestibility were small (986 vs. 997, P < 0.01 and 939 vs. 931 g•kg -1 , P < 0.05 in FTS and DTS respectively).The concentration of VFA in the rumen fluid was not affected by the type of silage (94.5 and 94.7 mmol•L -1 ); however, FTS induced a higher molar proportion of propionate (22.6% vs. 20.7%,P < 0.05) than DTS.The proportion of butyrate was higher in DTS (13.5% vs. 10.8%,P < 0.05).Microbial protein supply in FTS was significantly higher than in DTS (109.7 vs. 96.0g•kg -1 DM intake, P < 0.05).When expressed in relation to fermentable organic matter (FOM) intake, the differences between hybrids were greater (215.6 vs. 158.6g of microbial protein per kg FOM, P < 0.01).Lower efficiency of microbial protein synthesis in DTS was probably due to a lower pH value of rumen liquor (6.21 vs. 6.33,P < 0.05).FTS offered better conditions for the degradation of the fibre fraction in the rumen than DTS.The faeces of sheep that were given FTS contained less DM (304 vs. 371 g•kg -1 , P < 0.05) and tended to have a higher concentration of VFA (383 and 235 mmol•kg -1 DM, P < 0.1) indicating that in FTS at least one part of the starch which escaped digestion in the rumen passed through the small intestine undigested and was fermented in the large intestine.It was concluded that FTS could provide about three times more postruminally digested starch and about 20% more metabolisable protein than DTS. maize silage / starch digestion / protein digestion / microbial protein / sheep

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Authors
Verbic, J., Babnik, D., Žnidaršic-Pongrac, V., Resnik, M., Gregorcic, A., & Kmecl, V.
Affiliations
Agricultural institute of Slovenia (SI)
Venue
Animal Research
Publisher
EDP Sciences
Published
2005-11
Volume
54
Issue
6
Pages
443-458
ISSN
  • 1627-3583 (ISSN-L)
  • 1627-3591
DOI
10.1051/animres:2005034
OpenAlex
W2122560057
Cited by
5
References
45
Citations by year
2019: 1 · 2015: 1 · 2014: 1 · 2013: 1
FWCI
0.00
Type
journal article
Language
en
Open access
Locations
  • Animal Research (publishedVersion)
  • Springer Link (Chiba Institute of Technology) (submittedVersion)
  • HAL (submittedVersion, other-oa)
Funders
Ministrstvo za visoko šolstvo, znanost in tehnologijo
Topics
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Ruminant Nutrition and Digestive Physiology
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Crop Yield and Soil Fertility
Keywords
dent maize, flint maize, corn silage, sheep, rumen fermentation, starch digestibility, protein digestibility, microbial protein synthesis, volatile fatty acids, propionate, butyrate, rumen pH, urinary purine derivatives, fiber degradation, faecal digestibility, forage quality

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