Effect of two methods on rotational grazing in contorl gastrointestinal parasites and performance in lambs from birth to weaning
DOI:
https://doi.org/10.5433/1679-0359.2005v26n1p93Keywords:
Lambs, Gastrointestinal parasites, Grazing alternated, Grazing rotation.Abstract
The effects of two methods of rotational and grazing involving cattle and sheep on the control of gastrointestinal parasites and performance in lambs from birth to weaning were evaluated. Three areas with 1, 67 ha were sub-divided by electric fence into eight paddocks. Each paddock was grazed for 5 days and rested 35 days through June/01 to January/ 02. In treatment 1, 14 lambs and 20 ewes grazed in area 1 while 4 adults’ bovines grazed in area 2. After 40 days the animals inverted areas, that is, lambs and ewes grazed in area 2 and steers in area 1. At the same time in treatment 2, 14 lambs and 20 ewes were kept in area 3 under a simple rotational grazing system. Nematode egg counts (FEC) and larval culture were determined from fecal samples and live weight was obtained each 14 days. Packed cell volume (PCV) was determined every 28 days from blood samples. Data of FEC, PCV and live weight were statistically analyzed using the Statistical Analysis System (SAS). The parasites found in lambs were, Haemonchus and protozoa Eimeria spp. The genera Strongyloides and Eimeria and PCV there were not difference statistical between treatments (p < 0,01). The alternated grazing method between sheep and cattle reduced the parasitic infection (p < 0,01) of Haemonchus in ages 43-56 days and 57-70 days. The average lamb weights were: 31, 53 kg in T1 and 30 kg in T2 and there were no statistical difference between treatments (p < 0,05) on lamb performance.
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