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Anthelmintic and nutritional effects of heather supplementation on Cashmere goats grazing perennial ryegrass-white clover pastures

AuthorsOsoro, Koldo; Mateos-Sanz, A.; Frutos, Pilar ; García, Urcesino; Ortega Mora, Luis M.; Ferreira, Luis M. M.; Celaya, Rafael; Ferre, Ignacio
KeywordsCashmere goat
Gastrointestinal nematode
Body weight
Ruminal fermentation
Issue DateMar-2007
PublisherAmerican Society of Animal Science
CitationJournal of Animal Science 85 (3): 861-870(2007)
AbstractTo investigate anthelmintic and nutritional effects of heather supplementation in goats grazing perennial ryegrass-white clover pastures, 40 dry Cashmere goats were randomly assigned to 4 treatments in a 2 × 2 factorial arrangement: 2 grazing management treatments (supplementation with heather vs. nonsupplementation) and 2 anthelmintic treatments (treatment vs. nontreatment). Goats grazed continuously from May to September 2004. At the end of the grazing period, the number of dead goats due to gastrointestinal parasitism was 1 in the group supplemented with heather and dosed with anthelmintic, 4 in the group that received neither supplementation nor anthelmintic, and 0 in the other 2 groups. For goats that did not receive anthelmintic treatment, the percentage of heather in the diet was negatively correlated with fecal egg count in August (r = −0.59, P < 0.05) and September (r = −0.49, P < 0.1) and positively correlated (r = 0.54, P < 0.05) with BW changes during the grazing season. Therefore, the correlation coefficient between BW change and fecal egg count was negative (r = −0.62, P < 0.05). Rumen ammonia concentrations were always lower in supplemented goats (P < 0.05). However, VFA concentrations were greater in goats consuming heather (58.9 vs. 50.9 mmol/L), which suggests that ruminal fermentation was not adversely affected by consumption of tannins. Heather availability in the vegetation might represent a valuable opportunity and sustainable method to control gastrointestinal nematode infections in a goat production system based on grazing perennial ryegrass-white clover pastures.
Description10 pages.-- Available online 3 Nov 2006.
Publisher version (URL)http://jas.fass.org/cgi/content/full/85/3/861
Appears in Collections:(IGM) Artículos
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