Course code LauZ5034

Credit points 4

Feed Evaluation Systems

Total Hours in Course160

Number of hours for lectures32

Number of hours for seminars and practical classes32

Independent study hours96

Date of course confirmation04.10.2011

Responsible UnitInstitute of Animal Science

Course developer

author Dzīvnieku zinātņu institūts

Lilija Degola

Dr. agr.

Prior knowledge

LauZ5143, Biological Basis of Animal Husbandry

LauZ5163, Biochemical and Physiological Aspects of Animal Nutrition

Course abstract

Feed energy and nutrients (protein, carbohydrate etc.) evaluation systems used as integrated evaluation systems for feedstuffs. Feedstuffs digestibility as a criterion of nutrition value, factors influencing digestibly. Digestibility determination methods "in vivo" and "in vitro".

Learning outcomes and their assessment

Students will gain an in-depth knowledge of feed energy and nutrient evaluation systems. Successfully take part in workshops. To study skills for feedstuffs evaluation according by various criteria and obtain skills for choose the best evaluation system in different animal nutrition. Successfully did practical works. Students will be competent to explain and justify feeds for different evaluation systems. Successfully passed exam.

Course Content(Calendar)

1. Complex evaluation systems of feedstuffs, history of its development.
2. Assessment systems for feedstuffs used in the EU and US.
3. Digestibility of nutrients as part of a complex evaluation system for feedstuffs. Practical works 4h.
4. Determination of digestibility of nutrients.
5. Factors affecting the digestibility of feed and feed intakes.
1. Workshop. The History of Nutrition Assessment Systems Development and Digestibility-4h.
6. Gross energy , digestible, metabolizable and net energy as characteristics of the complete nutritional value of the nutrients. Practical works 4h.
7. Methods and content of energy determination in feedstuffs for animals of different species. Practical works 4h.
Workshop 2. Evaluation of feedstuffs by energy types. Energy requirement for animals-4h.
8. Evaluation systems of protein value and its usability. Practical works 4h.
9. Protein degradation in fore stomach of ruminants, influencing factors.
Workshop 3. Protein Evaluation in Feedstuffs for Animals of Different Species-4h.
10. Evaluation systems for various forms of carbohydrates and their role in ruminant and single-chamber stomach animals. Practical works 4h.
12. Classification of carbohydrates by Proximal and Van Soest analysis criteria.
13. Van Soest's Methods of Analysis for the Determination of Fibers, Neutral Detergent fibers and Acid Detergent fiber.
14. The use of crude fiber and its influencing factors.
15. The role and evaluation of lipids in animal nutrition.
Workshop 4. Evaluation of carbohydrates and lipids and their role in animal nutrition-4h.
16. Assessment and usefulness of the use of biologically active substances (minerals, vitamins and others) in animal nutrition. Practical works 4h.

Requirements for awarding credit points

Successfully did practical works and seminars, passed exam.

Description of the organization and tasks of students’ independent work

The student independently studies popular and scientific literature about topics of seminars.

Criteria for Evaluating Learning Outcomes

Student can get a successful mark on the exam if at least 50% of the questions are answered correctly. The practical work performed is evaluated according to the evaluation procedure specified in the practical task. Without the successful completion of practical works and seminars, student cannot take the exam.

Compulsory reading

1. Osītis U. Barības līdzekļu enerģētiskās un proteīna vērtēšanas sistēmas dažādās Eiropas valstīs. Jelgava: LLU, 1996. 95.lpp.
2. Osītis U. Dzīvnieku ēdināšana kompleksā skatījumā. Jelgava: Latvijas Lauku konsultāciju un izglītības centrs, 2005. 320.lpp.
3. Osītis U. Barības līdzekļu novērtēšana atgremotāju ēdināšanā. Jelgava: Latvijas Lauku konsultāciju un izglītības centrs, 1998. 102.lpp.

Further reading

1. Latvietis J. Lopbarība. SIA Latvijas Lauku konsultāciju un izglītības centrs. Ozolnieki, ISBN 978-9984-48-096-1, 2013. 308. Lpp.
2. Degola. L., Trūpa A., Aplociņa E. Lopbarības ķīmiskās analīzes un sagremojamība. SIA Drukātava, ISBN 978-9984-48-219-4, 2016. 52. lpp
3. World Review of Animal Production. World Association for Animal Production ISSN: 0043-8979.
4. Livestock Production Science Published/Hosted by Elsevier Science. ISSN: 0301-6226. 3. Pig International Published by Watt Publishing Company. ISSN: 0191-8834.

Periodicals and other sources

1. Populārzinātnisks žurnāls “Saimnieks”. Rīga : TEE BIO, 2004- ISSN 1691-1598.
2. Populārzinātnisks žurnāls “Agrotops” AgroTops. Rīga: Aģentūra Agro apgāds. ISSN 1407-5164.
3. Agronomy research, žurnāls, [tiešsaiste] [skatīts 10.02.2019.]. Pieejams
4. Science Direct database. [Online] [viewed 14.02.2019.].
5. Journal of Animal Science. Published/ American Society of Animal Science. ISSN (printed): 0021-8812. ISSN (electronic): 1525-3163
6. Zinātniski praktiskās konferences "Līdzsvarota lauksaimniecība" raksti. [tiešsaiste] [skatīts 14.02.2019.].


Feed Evaluation Systems