title: Influence of gastro-intestinal nematodes on the productivity of dairy cattle in the wet highlands of Sri Lanka.
abstract: 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 less than 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.
authors.affiliation: Department of Tropical Animal Production, Wageningen Agricultural University, The Netherlands.
authors.forename: J C
authors.initials: JC
authors.lastname: de Rond
authors.forename: R
authors.initials: R
authors.lastname: de Jong
authors.forename: J H
authors.initials: JH
authors.lastname: Boon
authors.forename: B
authors.initials: B
authors.lastname: Brouwer
mesh_terms: D000818:Animals; D000871:Anthelmintics / Q000627:therapeutic use*; D001835:Body Weight; D002417:Cattle; D002418:Cattle Diseases / Q000188:drug therapy / Q000191:economics*; D005243:Feces / Q000469:parasitology; D005260:Female; D006146:Guanidines / Q000627:therapeutic use; D007411:Intestinal Diseases, Parasitic / Q000188:drug therapy / Q000191:economics / Q000662:veterinary*; D007559:Ivermectin / Q000627:therapeutic use; D007774:Lactation; D009349:Nematode Infections / Q000188:drug therapy / Q000191:economics / Q000662:veterinary*; D010270:Parasite Egg Count; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000188:drug therapy / Q000191:economics / Q000662:veterinary; D011891:Rain; D011897:Random Allocation; D013188:Sri Lanka
chemical_list: D000871:Anthelmintics; D006146:Guanidines; D007559:Ivermectin; C017309:febantel