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The anthelmintic effect of heather supplementation may not always be associated with antinutritional effects in grazing goats

Other TitlesL'effet anthelmintique de la supplémentation par la bruyére n'est pas toujours associé avec les effects anti-nutritionnels chez les caprins en pâturage
AuthorsFrutos, Pilar ; Ferreira, Luis M. M.; Hervás, Gonzalo ; García, Urcesino; Moreno Gonzalo, Javier; Ferre, Ignacio; Celaya, Rafael; Ortega Mora, Luis M.; Osoro, Koldo
KeywordsGastrointestinal nematode
Rumen fermentation
Nématode gastro-intestinal
Fermentation ruminale
Issue Date2009
PublisherCentre international de hautes études agronomiques méditerranéennes
Food and Agriculture Organisation of the United Nations
National Agricultural Research Foundation (Greece)
CitationOptions Méditerranéennes A, 85: 43-48 (2009)
AbstractTo test the hypothesis that the beneficial anthelmintic effect of the consumption of moderate amounts of tannins is not always accompanied by anti-nutritional effects, we used 48 Cashmere goats randomly assigned to 2 treatments [supplemented with heather (6,4% total tannins) vs non-supplemented]. All goats grazed continously from May to September, under practical conditions in a mountain area of Northem Spain. Heather percentage in the diet of supplemented animals reached 29,1%. Supplementation with heather reduced the mean number of nematode eggs in faeces (P < 0.001) and the mortality rate (at the end of the grazing period, 2 goats had died in the group supplemented with heather vs 8 in the group without supplementation; P < 0.05). Rumen ammonia concentration was markedly decreased in goats receiving tannin-containing heather (160 vs 209 mmol/l; P < 0.01), which agrees with the well known effect of tannins on the proteolysis of feed protein. On the contrary, volatile fatty acid (VFA) concentrations were significantly greater in supplemented animals (63.0 vs 53.6 mmol total VFA/L) due mainly to acetic and propionic acid increases (approx. 26 and 16%, respectively), in spite of faleric and branched-VFA decreases, which suggests that ruminal fermentation was not adversely affected by tannin consumption. These data, together with a lower loss of live weight (P< 0.10) and body condition score (P< 0.05) in heather supplemented goats, support the absence of any apparent nutritional cost that counteracted the beneficial anthelmintic effect of the supplementation of grazing goats with tannin-containing heather.
Description6 pages, 2 tables, 1 figure.--Contributed to 12th Seminar of The FAO-CIHEAM Sub-Network on Sheep and Goat Nutrition "Nutritional and foraging ecology of sheep and goats" (Thessaloniki, Greece, Oct 11-13, 2007)
Later published as paper in: Animal 2(10): 1449-1456 (2008). https://digital.csic.es/handle/10261/13153
Publisher version (URL)http://www.ciheam.org/publications/options-mediterraneennes._5_40027_.php
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