Supplementation of Grass-fed Lambs

USDA researchers designed an experiment to determine the effect of forage-based production, either grass-fed or grass-based with modest supplementation, on gastro-intestinal nematode (GIN) infection and growth of fall-born lambs. Weaned, fall-born Katahdin lambs were rotationally grazed on predominantly grass pastures. legumes and forbs as grass quality waned. Half the lambs received no supplement. The other half were fed a grain by-product supplement (15% CP) at 0.5% of body weight per day. In the first year of the experiment, average daily gain (ADG) was greater for the supplemented lambs than the non-supplemented ones. There was no difference in the second year. Rams gained faster than ew

Wasted Dewormer

You can’t escape reading or hearing about disease-causing microorganisms — with exotic names like MRSA and E. coli OH:157 — that develop resistance to drugs. There are also plenty of reports about resistance to antibiotics in livestock and people or weeds’ resistance to crop chemicals. There is another kind of resistance in cattle, swine, sheep and goats: internal worms that develop resistance to deworming agents. On this subject, I offer you this true story about a couple of cattlemen and their herd of 200 brood cows out on Cowpath Road. Read more . . . Source: "Fighting Resistance with Brains and Brawn" Ohio Country Journal, June 24, 2019.

Impact of Gastrointestinal Parasitism

Mexican researchers used data from published literature to determine the impact of gastrointestinal parasitism on dry matter intake (DMI) and live-weight change (LWC) in lambs. They conducted a meta-analysis on the data from 22 experiments from 20 papers. Data showed that the interaction between worm burden and crude protein (CP) had an impact on the DMI of lambs. The best model for LWC was the interaction between energy (ME) and worm burden. In addition, the association of CP and worm burden was a model that predicted LWC. In 59% of experiments, there was a negative impact of parasitism on DMI. In 73% of experiments, there was a negative impact of parasitism on LWC. The meta-analysis showed

Supplementation of Lambs in Ohio

Over the course of four consecutive years, four experiments using a total of 312 Dorset x Hampshire crossbred lambs were conducted in order to determine the effects of supplementation on the health and performance of grazing lambs. Overall, this series of experiments has illustrated that supplying supplement to grazing lambs can improve body weight gains on pasture and reduce the need for anthelmintic treatment. Read more . . . Image by Brady Campbell

Restoring Efficacy of Fenbendazole

Researchers in Argentina were able to restore the efficacy of fenbendazole (SafeGuard®) by replacing a resistant population of Haemonchus contortus with a susceptible one. At the start of the experiment, the efficacy of fenbendazole was determined to be 0%. The resistant population of worms was reduced by anthelmintic treatments with efficacious drugs. Fecal egg counts were reduced from 2968 (300-7740) to 0 epg. Adult worm burdens of H. contortus were reduced from 2625 (800-5100) to 0. At weaning, lambs were artificially dosed with a new susceptible population of worms. Fecal egg counts of up to 7275 (3240-13080) epg and adult worm burdens of up to 500 (200-800) of H. contortus were achiev

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