Chemical, in vitro, and in vivo evaluation of soybeans heat-treated by various processing methods

M. A. Faldet, Yong-Suk Son, L. D. Satter

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

In trial 1, eight Holstein heifers weighing 410 kg were used in an 8 × 8 Latin square and fed TMR containing 79.3% alfalfa silage and 20% soybeans. The first four treatments were raw soybeans, soybeans roasted and held for 3 h at the roasting temperature, extruded soybeans, and soybeans roasted in a California Pellet Mill Jet-Sploder ®. The remaining four treatments were obtained by altering the residence time of soybeans in the Jet Sploder ®. The temperatures of soybeans exiting the roaster were 117, 126, 138, and 154°C for the last four treatments. The soybeans held 3 h postroasting and the extruded soybeans resulted in the highest estimate of postru-minal available lysine. Blood plasma concentrations of essential and branched-chain AA were highest in heifers fed soybeans held 3 h postroasting. In trial 2, 44 Holstein heifers weighing 150 to 250 kg were assigned randomly to one of four TMR. Diets consisted of 91.8% alfalfa silage and 7.5% of one of four soybean treatments. Treatments were raw soybeans, soybeans roasted in a drum roaster with an exit temperature of 146°C, and those roasted with exit ternperatures of 141 or 146°C and held for .5 h. Estimated postruminal available lysine was higher for soybeans roasted and held versus roasted or raw soybeans. However, BW gain for heifers was similar across diets, averaging .90 kg/d for 12 wk. Concentrations of AA in plasma were not affected by diet Overall, results support the recommendation of holding soybeans for at least .5 h following roasting.

Original languageEnglish
Pages (from-to)789-795
Number of pages7
JournalJournal of Dairy Science
Volume75
Issue number3
DOIs
Publication statusPublished - 1992 Mar 1

Fingerprint

processing technology
Soybeans
Hot Temperature
soybeans
heat
heifers
alfalfa silage
Silage
Medicago sativa
In Vitro Techniques
roasting
Diet
Lysine
Temperature
lysine
Holstein
diet
drums (equipment)
temperature
blood plasma

Keywords

  • Lysine
  • Protein
  • Ruminant
  • Soybean

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Food Science
  • Genetics

Cite this

Chemical, in vitro, and in vivo evaluation of soybeans heat-treated by various processing methods. / Faldet, M. A.; Son, Yong-Suk; Satter, L. D.

In: Journal of Dairy Science, Vol. 75, No. 3, 01.03.1992, p. 789-795.

Research output: Contribution to journalArticle

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