Organic matter and crude protein digestibility predicted from nitrogen and fibre fractionation of festulolium hybrids

Petr Homolka, Marie Koukolová and Veronika Koukolová
Additional contact information
Petr Homolka: Institute of Animal Science, Prague-Uhříněves, Czech Republic
Marie Koukolová: Institute of Animal Science, Prague-Uhříněves, Czech Republic
Veronika Koukolová: Institute of Animal Science, Prague-Uhříněves, Czech Republic

Czech Journal of Animal Science, 2018, vol. 63, issue 7, 272-279

Abstract: The objectives of the experiment were to study nitrogen fractions of the Cornell Net Carbohydrate and Protein System (CNCPS) and digestibility of organic matter (OMD) and crude protein (CPD) along with the possibilities for predicting OMD and CPD based on chemical composition and CNCPS nitrogen fractions. Thirty samples of festulolium hybrids (fescue hybrids and ryegrass hybrids) commonly used and certified in the Czech Republic were analyzed for chemical composition, brutto energy, and nitrogen fractions, these fractions being A (non-protein nitrogen), B1 (rapidly degradable protein), B2 (intermediately degradable protein), B3 (slowly degradable protein), and C (unavailable protein). OMD and CPD were determined by near-infrared reflectance spectroscopy. Nitrogen fractions showed similar mean values for both analyzed groups of festulolium hybrids. Mean rapidly, intermediately, and slowly soluble fractions (B1, B2, and B3, respectively) were 29.2, 30.7, and 33.7 g/kg of dry matter (DM) for fescue hybrids and 21.7, 33.5, and 31.9 g/kg of DM for ryegrass hybrids. There was a trend for fraction B2 to decrease with advancing maturity in relation to neutral detergent insoluble protein value. The mean content of bound fraction C was 10.4 g/kg of DM for fescue hybrids and 7.3 g/kg of DM for ryegrass hybrids. Three groups of hybrids were evaluated statistically: fescue (I), ryegrass (II), and combined fescue/ryegrass (III). Better regression equations were found for fescue/ryegrass hybrids. High degrees of CPD determination were identified with predictors of individual nitrogen fractions (R2 = 0.975; P > 0.0001). OMD was described in regressions only using nitrogen fractions A and B1 (R2 = 0.500; P > 0.0001).

Keywords: nitrogen fractions; Cornell system; nutritive value; ruminant (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://cjas.agriculturejournals.cz/doi/10.17221/10/2018-CJAS.html (text/html)
http://cjas.agriculturejournals.cz/doi/10.17221/10/2018-CJAS.pdf (application/pdf)
free of charge

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjs:v:63:y:2018:i:7:id:10-2018-cjas

DOI: 10.17221/10/2018-CJAS

Access Statistics for this article

Czech Journal of Animal Science is currently edited by Bc. Michaela Polcarová

More articles in Czech Journal of Animal Science from Czech Academy of Agricultural Sciences
Bibliographic data for series maintained by Ivo Andrle ().