Behavioural studies of sheep and cattle on pasture: a minor field study in Vietnam.
A study was conducted to determine the grazing and browsing activities of sheep and cattle in pastures in Vietnam. The activity of the animals was recorded every 15 min from early morning until late afternoon. It was shown that browsing accounted for only 6.5% of sheep activity, and occurred more often in the morning. 14 out of 55 browse plants were selected, with the highest preference for Opuntia monacantha. The sheep were primarily grazers and preferred to eat grass. The cattle showed 10% browsing activity. Farmers indicated that there was a general lack of feed, resulting in starving animals. Supplementation with elephant grass (Pennisetum purpureum) and rice straw was not enough to meet the animals' needs.