Ch 1 - History of feeding standards Flashcards
Coined the term “Hay Equivalents”
Albrecht Thaer
Problems with Hay Equivalents
- Based on forages, the most variable feed in terms of nutrition
- Lack of precise units of weights and measures
- Animal performance - amounts, not type
William Prout proposed
Foods can be characterized into saccharine, oleaginous, albuminous
Henneberg and Stohlmann
Invented the Weende Feed Analysis System
Proximate system
Ash, protein, ether extract, crude fiber, N-free extract
Emil von wolff
Die rationelle Fiitterung der landwirtschaftlichen Nutztiere
Nutrient requirements expressed as amounts of digestible fat, protein, carbs
-standards based on nutrients and not feeds
Wilbor Atwater
Brough Wolff’s standards to the US, developed Atwater Factors
Energy Standards
von Wolff’s digestible Nutrient Standards,
Atwaters Caloric values
TDN system (still used today)
Theophilu Haecker
recognized that nutrient requirements were based on not only amounts produced but also composition of product
Published feeding guide based on the cows weight, amount of milk produced and butterfat percentage
F. B. Morrison
Morrison Glossary of feeds
Allowance
implies safety factor
1953 dropped allowances in favor of
Requirements
