Site and extent of nutrient digestion by steers fed a low-quality bromegrass hay diet with incremental levels of soybean hull substitution

Article Abstract:

Incremental levels of soybean hull (SH) added to bromegrass hay diet of steers resulted in proportinate increase in total ruminal volatile fatty acids. Although ruminal ammmonia and pH decreased more rapidly and greatly as SH levels increased, neither decreased to levels which inhibit fiber degradation. In vivo organic matter and cell wall digestibility increased with increased SH levels whereas microbial efficiencies were not affected. Thus, SH can replace 60% of the dry matter intake of a low-quality forage diet without significant effects on the nutrient digestion of steers.

Health aspects, Food and nutrition, Grasses, Soybean as feed, Soybean feeds

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Performance, forage utilization, and ergovaline consumption by beef cows grazing endophyte fungus-infested tall fescue, endophyte fungus-free tall fescue, or orchardgrass pastures

Article Abstract:

The effects of endophyte-infected tall fescue, endophyte-infected tall fescue and orchardgrass grazing on the productivity of beef cattle was investigated. Body weight, milk production and calf weight gain all decreased when infected pastures were grazed. The intake and digestibility of the feed was not necessarily altered by fungus infestation, hence alterations in nutrient utilization are thought to be present. The level of ergovaline was dependent on the time of sampling, and could be an indicator of the potential severity of fescue toxicosis.

Animal feeding and feeds, Ergot alkaloids, Tall fescue

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Use of DNA probes to monitor nutritional effects on ruminal prokaryotes and Fibrobacter succinogenes S85

Article Abstract:

The effects of diet on ruminal prokaryotes' population were evaluated using DNA probes. Isolation and quantification methods used in the analysis of the 16S subunit of prokaryotic ribosomal RNAs were also evaluated to determine their suitability in approximating prokaryotic populations. Results indicated that DNA probes can provide an accurate measure of the kind and the number of prokaryotic microorganisms in the rumen. The probes can also be used to evaluate dietary effects on ruminal microflora.

Usage, Physiological aspects, Prokaryotes, DNA probes, Bacteriology, Rumen, Rumen microbiology

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