Banca de QUALIFICAÇÃO: FRANCISCA FERNANDA DA SILVA ROBERTO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : FRANCISCA FERNANDA DA SILVA ROBERTO
DATA : 25/10/2017
HORA: 09:00
LOCAL: Sala POP, Centro de Convivência do Campus Central - UFRN
TÍTULO:

Evaluation of sheep naturally infected by gastrintestinal nematoids under pastejo intermittent  in cultivars of Brachiaria brizantha

PALAVRAS-CHAVES:

coproculture, FAMACHA^©, Haemonchus sp., sheep, tropical pasture, Trichostrongylus sp.

PÁGINAS: 56
GRANDE ÁREA: Ciências Agrárias
ÁREA: Zootecnia
SUBÁREA: Produção Animal
RESUMO:

The objective of this study was to evaluate the response of naturally infected sheep by gastrointestinal nematodes under intermittent grazing conditions in different Brachiaria brizantha cultivars. The experiment was carried out in the Experimental Area of the Group of Forage Studies, located at the Macaíba Campus of the Universidade Federal  do Rio Grande do Norte - UFRN. The experimental period was from March 31 to August 31, 2017, which corresponded to two cycles of grazing. The animals were kept in a semi-intensive system with intermittent grazing, supplemented, and with access to water and mineral salt ad libitum. We used 48 sheep, with no defined racial pattern, with initial mean weight of 19.04 kg±0.96. They were randomly distributed in the four treatments that were composed by the cultivars Marandu, Xaraés, Piatã and Paiaguás. The experimental design was a randomized block design with 12 replicates in the animals and two blocks of the cultivars. The phenotypic variables evaluated weekly were: egg count per gram of faeces (EPG), coproculture, globular volume (VG), FAMACHA^© (FAM), weighing and body condition score (ECC). The parasitic loads of the animals were mixed and heavy with valuesabove 600 (eggs/g) in all cultivars, there was a significant difference in EPG between cultivars. Among the grazing cycles, there were differences in the EPG of the animals kept in the Marandu cultivar. In the coproculture were found the following genera: Haemonchus sp., Trichostrongylus sp., Strogyloides sp., and Oesophagostomum sp. the Haemonchus sp. was the most prevalent genus (above 80%) in all cultivars and grazing cycles. In the first grazing cycle, there was difference in VG of the animals kept in the cultivars Piatã (25.96%) and Xaraés (22.51%), those maintained in the other cultivars presented intermediate values. As for the FAM in cycle 1, the animals remained more frequently in grades 1, 2 and 3, in order of importance, already in cycle 2, the concentration with more than 50% of the individuals was in grade 1. In the weight variable the group maintained in the Xaraés cultivar differed from the others, with lower averages, in the two cycles. The ECC of the animals was concentrated in score 3 in the first cycle of grazing and in the second it varied between 3, 3,5 and 4. The cultivars of B. brizantha evaluated influenced the parasitic load of the animals. However, the Marandu cultivar provided enough nutritional conditions for the animals to support the infection. The cultivar Xaraés showed inferior to the others for the performance characteristics.

MEMBROS DA BANCA:
Presidente - 986835 - GELSON DOS SANTOS DIFANTE
Interno - 1282620 - HENRIQUE ROCHA DE MEDEIROS
Interno - 1714262 - LILIAN GIOTTO ZAROS DE MEDEIROS
Externo à Instituição - LUIZ DA SILVA VIEIRA - EMBRAPA