Relação da carga média, razão fêmea/macho e número de ovos por fêmea de populações de Cooperia spp., em bezerros HVB e mestiços HVB x Guzerá

Abstract

THE RELATIONSHIP BETWEEN MEAN WORM-BURDEN, FEMALE/MALE RATIO AND THE NUMBER OF EGGS PER FEMALE IN POPULATION OF Cooperia spp. IN CALVES FRIESIAN HOLSTEIN AND FRIESIEN HOLSTEIN X GUZERA CROSSES Forty calves of the breeding types Holstein-Friesian Red (HVB) crossed with Guzerá were used in this study and were obtained from the National Centre for Dairy Cattle Research (CNPGL - EMBRAPA), municipality of Marques de Valença, Rio de Janeiro State. Analyses were made of the relation between mean worm burden, female/male ratio, and the number of eggs per female of Cooperia spp., within and between the breeding types. The F 1 group (1/2 HVB) carried the lowest mean burden of helminths and the female/male ratio was more significant than in the HVB or other groups. The number of eggs per female did not present significant differences. 81 analysis. The group HVB showed intermediate values on Some observations on the dynamics of the worm burdens are presented. In the genus Cooperia, C. punctata v. Linstow, 1907 and C. spatulata Baylis, 1938 were observed, the latter species is recorded for the first time in South America.