Rodríguez AB, Quiroz RH, George SS

Language: English/Spanish
References: 0
Page: 145-148
PDF size: 374.22 Kb.

ABSTRACT

A study was done to determine the reinfestation degree by the intensity and the extensity effect, faecal egg count and the percent age of nematode gena in three different age bovines. During 112 days, forty-two bovines were surveyed and treated with Netobimin at 7.5 mg/kg body weight, and divided in three groups. The first group was constituted by 15 suckling calves; the second one with 17 weaning calves and the third with ten dairy cows. McMaster technique was performed before the treatment and on days 7th, 28th, 49th, 70th, 91st and 112th. Faecal samples were cultured in order to develop L₃ in each group. Egg count in faeces was reduced 91.13% in the first group, 100% in the second one and 100% in the third on the seventh day. On the 112th day, the intensity effect was 48.81%, 72.66% and 55.17%, respectively for the three groups. The extensity effect was 0%, 52.95% and 70.0%, respectively. On the 112th day this effect was the same as on day cero in the first group and different in the second and third groups. Nematode genus identified in the three groups were: Haemonchus, 56.42%, 82% and 82%; Ostertagia, 5.28%, 0% and 3.33%; Cooperia, 2.14%, 5.2% and 7.5%; Trichostrongylus, 7.5%, 12.8 and 7.16% and Strongyloides papillosus, 28.28%, 0% and 0%, respectively.