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Nutritional impact of crude glycerine infusion into the rumen of wethers fed a tropical or a temperate forage grass

Published online by Cambridge University Press:  11 July 2016

D. ZENI ,
G. V. KOZLOSKI ,
M. GINDRI ,
S. STEFANELLO ,
F. HENTZ  and
L. OLIVEIRA
D. ZENI
Affiliation:
Departamento de Zootecnia (Animal Science), Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
G. V. KOZLOSKI*
Affiliation:
Departamento de Zootecnia (Animal Science), Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
M. GINDRI
Affiliation:
Departamento de Zootecnia (Animal Science), Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
S. STEFANELLO
Affiliation:
Departamento de Zootecnia (Animal Science), Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
F. HENTZ
Affiliation:
Departamento de Zootecnia (Animal Science), Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
L. OLIVEIRA
Affiliation:
Departamento de Zootecnia (Animal Science), Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

The current study evaluated the nutritional impact of crude glycerine (CG) supplementation to wethers fed only forage grass. Eight Polwarth wethers were used in a replicated 4 × 4 Latin Square. Treatments consisted of no CG (control, CON) or intra-ruminal infusion of CG at daily rates of 0·5, 1·5 or 3·0 ml/kg body weight (BW). In each Latin Square, four animals were fed Avena strigosa and four were fed Cynodon sp. hay ad libitum. The actual concentration of glycerol in diet was similar for both forage types and varied from 21 to 364 g/kg dry matter. No interactions between forage type and CG treatments were detected and no differences were observed between the CON and 0·5 CG treatment for most variables. Both the organic matter (OM) and the digestible OM intake decreased linearly at increased levels of CG infusion, whereas no treatment effect was observed on OM and neutral detergent fibre (NDF) digestibility. The duodenal flow of rumen microbial nitrogen (N) was not affected, whereas the duodenal flow of α-amino N decreased linearly at increased levels of CG infusion. In conclusion, CG supplementation at a rate of up to 0·5 ml/kg BW/day did not change the nutrient supply whereas greater amounts of CG supplementation negatively impacted the nutrient supply to wethers fed only grass forage. The forage digestibility, in turn, was not affected by CG supplementation.

Type
Animal Research Papers
Information
The Journal of Agricultural Science , Volume 154 , Issue 7 , September 2016 , pp. 1306 - 1316
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Copyright
Copyright © Cambridge University Press 2016 

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