Abstract
ABSTRACT The objective of this study was to evaluate the effects of algae and cottonseed meal (CSM) supplementation on the fatty acid (FA) profile in the rumen fluid (RF) of steers fed a low-quality forage. Five Bos indicus crossbred steers, 187±7.5 kg liveweight (LW; mean±SD), were fed a low crude protein speargrass (Heteropogon contortus) hay as the basal diet alone or supplemented with either Spirulina platensis, Chlorella pyrenoidosa , Dunaliella salina , or CSM in Latin square design. The proportion [...]
Highlights
In recent years, the biotechnology of fuel production has led to an increased use of algae, with a parallel interest in the potential use of de-oiled algae byproducts for animal feeds (Bryant et al, 2012)
Cottonseed meal and Chlorella had the highest proportion of total unsaturated fatty acid (FA) (TUFA) and total C18 (TC18s) FA, with high proportions of linoleic acid (C18:2n-6) in both supplements and a high proportion of alpha-linolenic (C18:3n-3) in Chlorella
Unsupplemented steers had the highest proportion of total odd- and branched-chain FA (TOBCFA) (P
Summary
The biotechnology of fuel production has led to an increased use of algae, with a parallel interest in the potential use of de-oiled algae byproducts for animal feeds (Bryant et al, 2012). The protein and fat content vary considerably between algae, and this can have variable effects within the rumen (Panjaitan et al, 2015) and after absorption by the ruminant animal (Meale et al, 2014; Lamminen et al, 2019). 2 a high concentration of C18s FA, would result in different concentrations of conjugated linoleic acid isomers, reflecting the FA profile in RF and the extent of biohydrogenation thereof. The objective of this experiment was to evaluate the effects of algae and cottonseed meal (CSM) supplementation on the FA profile in the RF of cattle consuming a low-quality tropical forage
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