These sources guide standards, ingredient review and study design. They do not automatically substantiate an unfinished product.
2025 · Nutritional standard
Reading labels — nutritional adequacy statement formats
Association of American Feed Control Officials
Scope. Required label elements, the standardized nutritional adequacy statement formats, and what constitutes misbranding.
Supports. Gives the exact prescribed wording for each substantiation route and confirms that an incorrect adequacy statement, or a disease claim without an approved drug, is misbranding.
Does not establish. Does not carry force of law on its own — AAFCO models bind only where a state has adopted them, and AAFCO approves, certifies and endorses nothing.
Primary source ↗2024 · Systematic review
Invited review: probiotic approaches to improving dairy production
Journal of Dairy Science
Scope. Critical review of direct-fed microbials in dairy cattle and calves, covering microbial ecology, host immune interaction and production outcomes.
Supports. Establishes that direct-fed microbial effects are strain-, stage- and farm-specific, justifying defined-strain development over generic positioning.
Does not establish. Does not support generalised efficacy claims — the authors report efficacy has been highly variable and that all direct-fed microbials are not created equal.
Primary source ↗2024 · Consensus recommendations
Body condition scoring beef cattle (Publication P2508)
Mississippi State University Extension Service
Scope. Guide to the 1–9 body condition scoring scale, target scores by class and the nutrient density required to change condition.
Supports. Establishes body condition score as the practical, low-cost lever a nutrition program should be designed and measured against.
Does not establish. Does not establish that any specific supplement changes body condition score, and its reproductive statements are directional rather than quantified.
Primary source ↗2021 · Nutritional standard
Nutrient Requirements of Dairy Cattle: Eighth Revised Edition
National Academies of Sciences, Engineering, and Medicine
Scope. Requirements for preweaning, growing, reproducing and lactating dairy cattle across energy, protein and amino acids, minerals, vitamins and water.
Supports. Formulation targets for early-life calf products and the amino-acid-based protein framework expected in a technical dossier.
Does not establish. Does not establish efficacy, safety or economic return for any additive or supplement; requirement estimates are population-level, not herd-specific.
Primary source ↗2021 · Systematic review
Trace mineral nutrition of grazing beef cattle
Animals
Scope. Review of trace mineral status, antagonism and supplementation strategy in forage-based beef systems.
Supports. Justifies region-specific formulation and antagonist-adjusted inclusion rates; documents that free-choice intake varies enormously between individuals.
Does not establish. Does not establish that organic trace mineral sources outperform inorganic ones in ruminants — the authors describe that advantage as less clear and highly variable.
Primary source ↗2019 · Consensus recommendations
Protein and energy supplementation for beef cattle grazing rangelands (Circular 564)
New Mexico State University Cooperative Extension Service
Scope. Synthesis of the protein-versus-energy supplementation decision on dormant and low-quality rangeland forage, including delivery frequency.
Supports. Justifies protein-first supplement design on dormant forage and supports infrequent delivery with minimal performance penalty.
Does not establish. Does not support high-starch energy supplementation as a substitute, since such supplements suppress forage intake and digestion, and does not establish transfer outside dormant semi-arid rangeland.
Primary source ↗2016 · Nutritional standard
Nutrient Requirements of Beef Cattle: Eighth Revised Edition
National Academies of Sciences, Engineering, and Medicine
Scope. Energy, protein, mineral and vitamin requirements for beef cattle, with feed composition tables covering grazed forages.
Supports. The numerical basis for target nutrient concentrations and intake assumptions in mineral, protein and energy supplements.
Does not establish. Does not establish that any commercial product meets those requirements in the field, and does not predict production responses to supplementation above requirement.
Primary source ↗2009 · Systematic review
Meta-analysis of the influence of Saccharomyces cerevisiae supplementation on ruminal parameters and milk production of ruminants
Journal of Dairy Science
Scope. Quantitative meta-analysis across 110 papers, 157 experiments and 376 treatments evaluating live yeast in ruminants.
Supports. Supplies pooled, citable effect sizes for live yeast on rumen pH, volatile fatty acids, dry matter intake and milk yield.
Does not establish. Does not establish that these small average effects are commercially meaningful or that they generalise to a specific strain, dose or forage-based grazing diet.
Primary source ↗