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Metabolizable protein and energy supply in lambs fed annual ryegrass (Lolium multiflorum Lam.) supplemented with sources of protein and energy

Published online by Cambridge University Press:  22 December 2010

G. A. AMARAL ,
G. V. KOZLOSKI ,
A. B. SANTOS ,
D. S. CASTAGNINO ,
A. C. FLUCK ,
R. FARENZENA ,
T. P. ALVES  and
F. R. MESQUITA
G. A. AMARAL
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Campus Camobi, Santa Maria, 97105-900, RS, Brazil
G. V. KOZLOSKI*
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Campus Camobi, Santa Maria, 97105-900, RS, Brazil
A. B. SANTOS
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Campus Camobi, Santa Maria, 97105-900, RS, Brazil
D. S. CASTAGNINO
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Campus Camobi, Santa Maria, 97105-900, RS, Brazil
A. C. FLUCK
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Campus Camobi, Santa Maria, 97105-900, RS, Brazil
R. FARENZENA
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Campus Camobi, Santa Maria, 97105-900, RS, Brazil
T. P. ALVES
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Campus Camobi, Santa Maria, 97105-900, RS, Brazil
F. R. MESQUITA
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Campus Camobi, Santa Maria, 97105-900, RS, Brazil
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

Ten Polwarth×Texel lambs (26±2·1 kg live weight (LW)), housed in metabolism cages and offered ryegrass (Lolium multiflorum) ad libitum, were used in a 5×5 Latin Square experiment to evaluate the effect of supplement type on digestion processes and on amino acid and energy supplies. Five of the 10 lambs were fitted with a rumen catheter and duodenal cannulae. Treatments included no supplement (control); 7 g/kg LW daily of cassava meal (Manihot esculenta, high-starch low-nitrogen (HS-LN)), cassava meal plus corn gluten meal (2:1, high-starch high-undegradable N (HS-UN)), cassava meal plus calcium caseinate (2·8:1, high-starch high-degradable N (HS-DN)) or corn gluten feed (low-starch high-degradable N (LS-DN)). Total intake of dry matter (DM), organic matter (OM) and N, as well as digestible OM intake were increased with HS-UN, HS-DN and LS-DN (P⩽0·050). Forage DM intake was reduced by HS-LN (P=0·030). Apparent digestibility of DM and OM was increased by HS-LN and HS-DN (P⩽0·038). Digestibility of neutral detergent fibre (NDF) and OM true digestibility were similar for all treatments. Supplementation with HS-LN decreased duodenal flux of total N, amino acid N, ammonia N and feed residual N (P⩽0·023). None of the supplements affected rumen microbial protein entering the small intestine, whereas the efficiency of rumen microbial protein synthesis (EMPS) was reduced by HS-LN and HS-DN (P⩽0·036). Ruminal degradability of dietary N (RDN) was increased by HS-LN, HS-DN and LS-DN (P⩽0·050). In conclusion, supplementing lambs fed ryegrass with degradable or undegradable high-protein concentrate increased the amino acid supply without affecting the supply of digestible energy, regardless of either the starch content or the degree of ruminal degradability of the protein source. These results indicate that supplementation of ryegrass-based diets should include both starch and protein sources.

Type
Animals
Information
The Journal of Agricultural Science , Volume 149 , Issue 4 , August 2011 , pp. 519 - 527
Copyright
Copyright © Cambridge University Press 2010

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