Submitted to: American Society of Animal Science Southern Section Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 10/24/2006
Publication Date: N/A
Technical Abstract: Because complete dewormer resistance is no longer uncommon in small ruminants, alternative means to control gastrointestinal nematodes (GIN) is imperative. The objective was to investigate the interaction between grazing sericea lespedeza (SL) and use of COWP to control GIN, where the primary species was Haemonchus contortus. In mid-June yearling Boer does that weighed 35 ± 2 kg were assigned randomly in a 2 x 2 factorial design to receive no or 5 g COWP and grazed tall fescue (TF; 4 untreated and 6 COWP-treated does/forage) or SL (6 untreated and 4 COWP-treated does/forage) at a stocking rate of 10 does/0.4 ha. Does were offered free choice trace mineralized salt and water. Does grazed respective pastures for 21 d then were all returned to tall fescue. Feces and blood were collected every 7 d for 28 d for fecal egg count (FEC) and blood packed cell volume (PCV) analyses. Mature does administered 5 g COWP that grazed SL benefited from both GIN control measures with the lowest FEC between Days 7 and 28, though the interaction was not significant, and the highest PCV by Day 21 compared with other groups (COWP x forage x day, P<0.02). COWP decreased FEC in both TF and SL grazing goats within 7 d of treatment, but means began to increase by Day 28 (COWP x day, P<0.02). In addition, FEC from the SL goats tended to be lower than the TF goats (P < 0.07), but then increased after withdrawal from SL pasture. None of the COWP-treated does required deworming by Day 28, but 54 ± 11.6% of untreated does required deworming by this time (P<0.005). A combination of COWP and SL appears to be beneficial for GIN management in goats.