caa a22 4500 465744605 CHVBK 20180323111817.0 cr unu---uuuuu 170327e19900601xx s 000 0 eng 10.1007/BF02239843 doi (NATIONALLICENCE)springer-10.1007/BF02239843 Influence of gastro-intestinal nematodes on the productivity of dairy cattle in the wet highlands of Sri Lanka [Elektronische Daten] [J. de Rond, R. de Jong, J. Boon, B. Brouwer] Influence Des Nematodes Gastro-Intestinaux Sur La Productivite Du Betail Laitier Dans Les Hautes Terres Humides De Ski Lanka Summary: To study the response and economics of nematode control in cattle, trials with anthelmintics were carried out in the wet season at New Zealand farm in the highlands of Sri Lanka. Three age groups were used: stall fed yearlings, grazing heifers and lactating cows. Groups were treated with ivermectin or febantel and monitored along with control groups for faecal egg counts, growth and milk production. Treatment reduced the trichostrongylid faecal egg counts in yearlings, heifers and cows for six to 10 weeks, for more than 10 weeks and for 140 days respectively. The growth rate of treated yearlings did not increase significantly while treated heifers did grow significantly faster. Treated cows produced an average of 115 kg more milk over 133 days (P<0.05). The economic gains in reducing the age at first service and in terms of milk yield far outweighed the cost of anthelmintics used. Centre for Tropical Veterinary Medicine, 1990 de Rond J. Department of Tropical Animal Production, Wageningen Agricultural University, PO Box 338, 6700 AH, The Netherlands aut de Jong R. Department of Tropical Animal Production, Wageningen Agricultural University, PO Box 338, 6700 AH, The Netherlands aut Boon J. Department of Fish Culture and Fisheries, Wageningen Agricultural University, PO Box 338, 6700 AH, The Netherlands aut Brouwer B. Department of Tropical Animal Production, Wageningen Agricultural University, PO Box 338, 6700 AH, The Netherlands aut Tropical Animal Health and Production Kluwer Academic Publishers-Human Sciences Press 22/2(1990-06-01), 135-143 0049-4747 22:2<135 1990 22 11250 https://doi.org/10.1007/BF02239843 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02239843 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- de Rond J. Department of Tropical Animal Production, Wageningen Agricultural University, PO Box 338, 6700 AH, The Netherlands aut NATIONALLICENCE 700 1- de Jong R. Department of Tropical Animal Production, Wageningen Agricultural University, PO Box 338, 6700 AH, The Netherlands aut NATIONALLICENCE 700 1- Boon J. Department of Fish Culture and Fisheries, Wageningen Agricultural University, PO Box 338, 6700 AH, The Netherlands aut NATIONALLICENCE 700 1- Brouwer B. Department of Tropical Animal Production, Wageningen Agricultural University, PO Box 338, 6700 AH, The Netherlands aut NATIONALLICENCE 773 0- Tropical Animal Health and Production Kluwer Academic Publishers-Human Sciences Press 22/2(1990-06-01), 135-143 0049-4747 22:2<135 1990 22 11250 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer