Efeito da substituição do feno de Tifton 85 pelo caroço de algodão como fonte de fibra na dieta de bezerros / Effect of substitution of Tifton 85 hay by whole cotton seed as fiber source in the diets of calves

Para avaliar a substituição do feno Tifton 85 pelo caroço de algodão como fonte de fibra na dieta foram utilizados 24 bezerros da raça Holandesa, distribuídos em dois grupos. O grupo-feno recebeu feno e concentrado separados, fornecidos à vontade, e o grupo- algodão recebeu caroço de algodão incorporado ao concentrado (13,5 por cento), à vontade. O consumo de alimentos, o peso, as alturas da cernelha e do íleo, as circunferências torácica e abdominal, a concentração de glicose sangüínea, as concentrações de acetato, propionato e butirato, o pH do fluido ruminal e os pesos dos compartimentos do estômago foram mensurados. O consumo de alimentos, o desenvolvimento ponderal dos animais, as concentrações de acetato, propionato e butirato, o pH do fluido ruminal, as concentrações de glicose sangüíneas e o peso dos compartimentos do estômago foram semelhantes entre os tratamentos (P>0,05). A necropsia, não foram observadas alterações sugestivas de intoxicação por gossipol. Concluiu-se que o caroço de algodão substituiu, sem prejuízos, o feno como fonte de fibra na dieta de bezerros

Twenty-four Holstein calves divided into two groups were used to evaluate Tifton 85 hay or whole cotton seed as fiber source in their diets. One group received Tifton 85 hay and concentrate ad libitum (hay group) and the other received ad libitum (cotton group) only concentrate with whole cotton seed incorporated (13,5 percent). Feed intake; weight; whither and ileum heights; thoracic and abdominal circumferences; acetate, propionate and butyric concentrations; pH of ruminal content; blood glucose; and rumen, reticulum, omasum and abomasum weights were measured. Feed intake; animal performance; acetate, propionate and butyric concentrations; pH of ruminal content; blood glucose and weight of stomach compartments did not differ between the groups (P>0.05). No clinical evidence of gossypol intoxication was observed. It was concluded that whole cotton seed replaced hay as fiber source in the diets of calves

Electroantennogram responses of the potato tuber moth, Phthorimaea operculella (Lepidoptera; Gelichiidae)to plant volatiles.

Electroantennograms (EAGs)were recorded from males and females of the potato tuber moth,Phthorimaea operculella in response to a broad range of plant volatile compounds belonging to diverse chemical classes.The responses to 27 compounds were evaluated,which indicated significant differences in EAGs between chemicals as well as between sexes.The fatty acid derivatives comprising essentially green leaf volatile components elicited significantly greater responses in females.The response profile of males was,in general,lower than that of females.EAG responses to the oxygenated and hydrocarbon monoterpenes were lower in both males and females.Dose -response studies indicate differences in response between the sexes and concentrations,suggesting the existence of sexual dimorphism. Compounds belonging to the fatty acid derivatives class appear to be important for an oligophagous pest such as the potato tuber moth and the findings are discussed in relation to host plant selection in this species.