Species and breed differences of small ruminants in response to experimental infection with Haemonchus contortus and growth performance in a centralized performance test

TitleSpecies and breed differences of small ruminants in response to experimental infection with Haemonchus contortus and growth performance in a centralized performance test
Publication TypeJournal Article
Year of Publication2016
AuthorsTsukahara, Y, Gipson, TA, Hart, SP, Dawson, LJ, Wang, Z, Puchala, R, Sahlu, T, Goetsch, AL
JournalJournal of Animal Science
Volume94
Issuesuppl_5
Pagination831 - 831
Date PublishedJan-10-2016
ISSN0021-8812
AbstractThe response to experimental infection with Haemonchus contortus and growth performance of small ruminant males were compared in a central performance test at Langston University (LU). Seventy five Boer (3.8 mo of initial age, 19 kg), 51 Kiko (3.7 mo, 19 kg), and 50 Spanish goats (3.9 mo, 18 kg) and 43 Dorper (3.9 mo, 29 kg), 75 Katahdin (3.7 mo, 28 kg), and 42 St. Croix sheep (4.2 mo, 20 kg) from 8 commercial farms in AR, KS, MO, and OK and LU were housed separately in adjacent pens with automated feeders allowing free-choice access to a 15% CP (DM) and 50% concentrate pelletized diet. The test entailed an adjustment period of 2 wk followed by 8 wk of data collection. Body weight was determined weekly. During adaptation, anthelmintic treatment resulted in low fecal egg count (initial FEC = 64 eggs/g; SEM = 7.0), after which a dose of 10,000 larvae was administered orally. After the infection, packed cell volume (PCV) was measured weekly and FEC was determined 5 times in wk 5-9. Data were analyzed using the GLM procedure of SAS® with fixed effects of species and breed within species. Initial BW, PCV, and FEC were covariates and the logarithmic transformation was used for individual mean FEC. Species differed in ADG (P < 0.01; 176 and 305 g; SEM = 4.1), DMI (P < 0.01; 1.14 and 1.81 kg/d; SEM = 0.032), FEC (P = 0.02; 1,897 and 1,488 eggs/g in untransformed scale; SEM = 135.1), and PCV (P < 0.01; 26.7 and 29.1% for goat and sheep; SEM = 0.20). Dorper and Katahdin had greatest (P < 0.01) ADG (231, 154, 144, 329, 316, and 270 g; SEM = 6.8) and DMI (1.37, 0.94, 1.11, 1.98, 1.94, and 1.51 kg/d for Boer, Kiko, Spanish, Dorper, Katahdin, and St. Croix, respectively; SEM = 0.054). St. Croix had the lowest (P < 0.05) FEC (1,701, 2,548, 1,442, 1,957, 1,587, and 921 eggs/g; SEM = 233.9) and highest (P < 0.01) PCV (25.8, 27.8, 26.5, 29.0, 27.7, and 30.7% for Boer, Kiko, Spanish, Dorper, Katahdin, and St. Croix, respectively; SEM = 0.34). In conclusion, there was considerable variability between species, among breeds, and within breeds in resistance to internal parasite based on FEC and PCV after an artificial challenge with H. contortus larvae in a standardized environment.
URLhttp://academic.oup.com/jas/article/94/suppl_5/831/4767592http://academic.oup.com/jas/article-pdf/94/suppl_5/831/23335575/831a.pdf
DOI10.2527/jam2016-1706