In vitro digestibility, In situ degradability, rumen fermentation and N metabolism of camelina co-products for beef cattle studied with a dual flow continuous culture system of camelina co-products for beef cattle

Hèctor Salas, Lorena Castillejos*, Montserrat López-Suárez, Alfred Ferret

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Camelina meal (CM) and camelina expeller (CE) were compared with soybean meal (SM) and rapeseed meal (RM). Trial 1 consisted of a modified Tilley and Terry in vitro technique. Trial 2 was an in situ technique performed by incubating nylon bags within cannulated cows. Trial 3 consisted in dual-flow continuous culture fermenters. In Trial 1, CM, CE and RM showed similar DM digestibility and OM digestibility, and SM was the most digestible ingredient (p < 0.05). Trial 2 showed that CE had the numerically highest DM degradability, but CP degradability was similar to RM. Camelina meal had a DM degradability similar to SM and RM and had an intermediate coefficient of CP degradability. In Trial 3, CE diet tended to present a higher true OM digestibility than SM diet (p = 0.06). Total volatile fatty acids (VFA) was higher in CE and CM diets than in SM diet (p = 0.009). Crude protein degradation tended to be higher (p = 0.07), and dietary nitrogen flow tended to be lower (p = 0.06) in CE diet than in CM diet. The efficiency of microbial protein synthesis was not affected by treatment (p > 0.05). In conclusion, CE and CM as protein sources differ in CP coefficient of degradability but their results were similar to RM. More differences were detected with regard to SM.

Original languageAmerican English
Article number1079
JournalAnimals
Volume9
Issue number12
DOIs
Publication statusPublished - Dec 2019

Keywords

  • Beef cattle
  • Camelina co-products
  • Protein sources
  • Rumen microbial fermentation

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