Hostname: page-component-cd9895bd7-hc48f Total loading time: 0 Render date: 2024-12-27T11:54:55.340Z Has data issue: false hasContentIssue false
  • English
  • Français

Polyethylene glycol in concentrate or feedblocks to deactivate condensed tannins in Acacia cyanophylla Lindl. foliage 1. Effects on intake, digestion and growth by Barbarine lambs

Published online by Cambridge University Press:  18 August 2016

H. Ben Salem ,
N. Atti ,
A. Priolo  and
A. Nefzaoui
H. Ben Salem*
Affiliation:
INRA-Tunisie, Laboratoire de Nutrition Animale, rue Hédi Karray, 2049 Ariana, Tunisia
N. Atti
Affiliation:
INRA-Tunisie, Laboratoire de Recherche Ovine et Caprine, rue Hédi Karray, 2049 Ariana, Tunisia
A. Priolo
Affiliation:
University of Catania, DACPA Sezione di Scienze delle Produzioni Animali via Valdisavoia 5, 95123 Catania, Italy
A. Nefzaoui
Affiliation:
INRA-Tunisie, Laboratoire de Nutrition Animale, rue Hédi Karray, 2049 Ariana, Tunisia
*
†E-mail:bensalem.hichem@iresa.agrinet.tn
Get access

Abstract

Thirty young male sheep were given air-dried foliage of Acacia cyanophylla Lindl. ad libitum and 400 g oat hay. Animals were divided into five equal groups each of which was supplemented with either 300 g concentrate with (CPEG) or without (C) 20 g polyethylene glycol 4000 (PEG) or urea-containing feedblocks with (BUPEG) or without (BU) PEG. One other treatment was PEG-containing feedblock without urea (BPEG). PEG was used to preferentially bind A. cyanophylla condensed tannins (CT). Feedblocks (BU, BPEG and BUPEG respectively) were made from olive cake (395, 376 and 353), wheat bran (263, 250 and 235), wheatfeeds (132, 125 and 118), quicklime (88, 83 and 78), salt (44, 42 and 39), mineral and vitamin supplement (12, 10 and 10), urea (66, 0 and 59) and PEG (0, 114 and 107 g/kg). These diets were used in growth (60 days) and metabolism (7 days) studies. Urea-containing feedblocks, as compared with concentrate, were higher in crude protein (CP; 235 v. 116 g/kg DM) and lower in metabolizable energy (6 v. 10 MJ/kg DM). The type of supplement (i.e. concentrate v. feedblocks) had no effect (P > 0·05) on A. cyanophylla DM intake, CP and neutral-detergent fibre (NDF) digestibilities and nitrogen (N) retention. However, concentrate-containing diets exhibited higher DM and organic matter (OM) digestibilities (P < 0·05), urinary excretion of allantoin (P < 0·05), microbial N supply (P < 0·001) and average daily gain (P < 0·001). PEG supply increased DM intake of A. cyanophylla, CP digestibility, N retention, allantoin voided in urine, microbial N supply and lamb growth. PEG-containing feedblocks enriched (BUPEG) or not (BPEG) with urea had similar effect on A. cyanophylla intake, DM, OM and NDF digestibilities, allantoin in urine, microbial N supply and average daily gain. These findings suggested that urea inclusion in feedblocks are not necessary and thus the feeding cost may be reduced. The higher amount of microbial N and daily gain in lambs given concentrate as compared with those on feedblock-supplemented diets was ascribed to the level of energy which was low in the latter diets. Enrichment of feedblocks with energy-rich ingredients such as molasses or cactus fruits could be a solution. This work confirmed that tannins depressed the nutritive value of this shrub species and lamb growth. However, the reduction was not drastic in the absence of PEG in the diet. Feedblock diet (BU) matched maintenance requirements of lambs while lambs on concentrate-supplemented diet (C) grew at a rate of 78 g/day. The choice between these two supplements will depend upon farm conditions and objectives.

Keywords

Acacia cyanophyllagrowthpolyethylene glycolsheeptannins
Type
Research Article
Information
Animal Science , Volume 75 , Issue 1 , August 2002 , pp. 127 - 135
Copyright
Copyright © British Society of Animal Science 2002

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Association of Official Analytical Chemists. 1984. Official methods of analysis, 14th edition. AOAC, Washington, DC.Google Scholar
Ben Salem, H. 1998. Effets de l’Acacia cyanophylla Lindl. sur l’ingestion et la digestion des régimes destinés aux ovins. Rôle des tanins et perspective d’amélioration de sa valeur alimentaire. Thèse Doctorat de l’Université de Dijon, France.Google Scholar
Ben Salem, H., Nefzaoui, A., Abdouli, H. and Ben Salem, L. 1995. Energy or nitrogen supply to sheep fed Acacia cyanophylla Lindl. leaves based diets. Effects on intake and digestion. Annales de Zootechnie 44: 76.Google Scholar
Ben Salem, H., Nefzaoui, A., Abdouli, H. and Ørskov, E. R. 1996. Effect of increasing level of spineless cactus (Opuntia ficus indica var. inermis) on intake and digestion by sheep given straw-based diets. Animal Science 62: 293–299.Google Scholar
Ben Salem, H., Nefzaoui, A., Ben Salem, L. and Tisserand, J. L. 1999a. Intake, digestibility, urinary excretion of purine derivatives and growth by sheep given fresh, air-dried or polyethylene glycol-treated foliage of Acacia cyanophylla Lindl. Animal Feed Science and Technology 78: 297–311.CrossRefGoogle Scholar
Ben Salem, H., Nefzaoui, A., Ben Salem, L. and Tisserand, J. L. 1999b. Different means of administering polyethylene glycol to sheep: effect on the nutritive value of Acacia cyanophylla Lindl. foliage. Animal Science 68: 809–818.CrossRefGoogle Scholar
Ben Salem, H., Nefzaoui, A., Ben Salem, L. and Tisserand, J. L. 2000. Deactivation of condensed tannins in Acacia cyanophylla Lindl. foliage by polyethylene glycol in feed blocks. Effect on feed intake, diet digestibility, nitrogen balance, microbial synthesis and growth by sheep. Livestock Production Science 64: 51–60.Google Scholar
Ben Salem, H., Nefzaoui, A., Ferchichi, H., Ben Salem, L. and Tisserand, J. L. 1997. Intake and digestion in sheep given fresh or air-dried Acacia cyanophylla Lindl. foliage. Annales de Zootechnie 46: 361–374.Google Scholar
Chen, X. B. and Gomes, M. J. 1992. Estimation of microbial protein supply to sheep and cattle based on urinary excretion of purine derivatives. An overview of the technical details. Occasional publication 1992. International Feed Resources Unit, Rowett Research Institute, Aberdeen. Google Scholar
Chriyaa, A., Moore, K. J. and Waller, S. S. 1997. Browse foliage and annual legume pods as supplements to wheat straw for sheep. Animal Feed Science and Technology 62: 85–96.Google Scholar
Degen, A. A., Becker, K., Makkar, H. P. S. and Borowy, N. 1995. Acacia saligna as a fodder tree for desert livestock and the interaction of its tannins with fibre fractions. Journal of the Science of Food and Agriculture 68: 65–71.Google Scholar
Degen, A. A., Mishorr, T., Makkar, H. P. S., Kam, M., Benjamin, R. W., Becker, K. and Schwartz, H. J. 1998. Effect of Acacia saligna with and without administration of polyethylene glycol on dietary intake in desert sheep. Animal Science 67: 491–498.Google Scholar
Goering, H. K. and Van Soest, P. J. 1970. Forage fiber analyses (apparatus, reagents, procedures and some applications). Agricultural handbook no. 379, US Department of Agriculture, Washington, DC.Google Scholar
Leng, R. A. 1990. Factors affecting the utilisation of poor-quality forages by ruminants particularly under tropical conditions. Nutrition Research Reviews 3: 277–303.Google Scholar
McDougall, E.I. 1948. Studies on ruminant saliva. I. The composition and output of sheep’s saliva. Biochemistry Journal 43: 99–109.CrossRefGoogle ScholarPubMed
Makkar, H. P. S. and Goodchild, A. V. 1996. Quantification of tannins: a laboratory manual. International Centre for Agricultural Research in the Dry Areas, Aleppo, Syria.Google Scholar
Menke, K. H. and Steingass, H. 1988. Estimation of the energetic feed value from chemical analysis and in vitro gas production using rumen fluid. Animal Research and Development 28: 7–55.Google Scholar
Priolo, A., Ben Salem, H., Atti, N. and Nefzaoui, A. 2002. Polyethylene glycol in concentrate or feedblocks to deactivate condensed tannins in Acacia cyanophylla Lindl. foliage. 2. Effects on meat quality of Barbarine lambs. Animal Science 75: 137–140.Google Scholar
Pritchard, D. A., Martin, P. R. and O’Rourke, P. K. 1992. The role of condensed tannins in the nutritional value of mulga (Acacia aneura) for sheep. Australian Journal of Agricultural Research 43: 1739–1746.Google Scholar
Reed, J. D., Soller, H. and Woodward, A. 1990. Fodder tree and straw-diets for sheep: intake, growth, digestibility and the effects of phenolics on nitrogen utilisation. Animal Feed Science and Technology 30: 39–50.Google Scholar
Silanikove, N., Gilboa, N., Nir, I., Perevolotsky, A. and Nitsan, Z. 1994. Effect of a daily supplementation of polyethylene glycol on intake and digestion of tannin-containing leaves (Quercus calliprinos, Pistacia lentiscus and Ceratonia siliqua) by goats. Journal of Agricultural and Food Chemistry 42: 199–205.Google Scholar
Silanikove, N., Nitsan, Z. and Perevolotsky, A. 1996. Effect of a daily supplementation of polyethylene glycol on intake and digestion of tannin-containing leaves (Ceratonia siliqua) by sheep. Journal of Agricultural and Food Chemistry 44: 2844–2847.Google Scholar
Statistical Analysis Systems Institute. 1987. SAS user’s guide: statistics, sixth edition. Statistical Analysis Systems Institute Inc., Cary, NC.Google Scholar