Full text
| |
| Author(s): |
Angelo Dias Brito Ribeiro
Total Authors: 1
|
| Document type: | Master's Dissertation |
| Press: | Pirassununga. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD) |
| Defense date: | 2015-06-26 |
| Examining board members: |
Alexandre Vaz Pires;
Evandro Maia Ferreira;
Paulo Henrique Mazza Rodrigues
|
| Advisor: | Alexandre Vaz Pires |
| Abstract | |
Three experiments were conducted with the objective of evaluate the effect of thyme essential oil on ruminal fermentation, metabolism and performance. The experiment I was conducted to evaluate the thyme essential oil has an effect on ruminal fermentation and consequently the metabolism of feedlot sheep, as well as evaluate the intake and apparent digestibility of nutrients diets with 90% concentrate and 10% forage. They were used 20 sheep ½ Dorper x ½ Santa Inês, castrated males and fistulated in the rumen. The experiment lasted 23 days, of which 18 were for adaptation diets. The basal ration consisted of hay coast cross, ground corn, soybean meal, limestone, of ammonia chloride and mineral mixture. The experimental diets were: 1) basal ration + 25 mg of monensin per kg/DM, 2) basal ration + 1.25 mL, 3) basal ration + 2.50 mL and 4) basal ration + 3.75 mL of essential oil of thyme per kg/DM. The intake and digestibility of DM, OM, NDF and CP were similar between treatments. The SCFA concentrations for diets with essential oil were similar to the diet with monensina. The inclusion of thyme essential oil in diets that this is a potential alternative to monensina. The experiment II was conducted to evaluate the thyme essential oil has an effect on ruminal fermentation and consequently the metabolism of feedlot sheep, as well as evaluate the intake and apparent digestibility of nutrients diets with 80 % forage and 20% concentrate. They were used 20 sheep ½ Dorper x ½ Santa Inês, castrated males and fistulated in the rumen. The experiment lasted 28 days, of which 23 were for adaptation diets. The basal ration consisted of pre-dryng Tifton, ground corn, soybean meal, limestone and mineral mixture. The experimental diets were: 1) basal ration + 25 mg of monensin per kg/DM, 2) basal ration + 1.25 mL, 3) basal ration + 2.50 mL and 4) basal ration + 3.75 mL of essential oil of thyme per kg/DM. The intake and digestibility of DM, OM, NDF and CP were similar between treatments. The lower inclusion of essential oil showed a value propionate and acetate: propionate ratio similar monensin. There were diet x day interaction for isobutyrate, butyrate, isovalerate and the total SCFA. The diet with 1.25 mL of thyme showed the highest pH value. The thyme essential oil can be an alternative to replace the use of monensina. The experiment III was conducted to evaluate the thyme essential oil on weight gain and feed efficiency of feedlot lambs diets with 80% forage and 20% concentrate. Fifty lambs ½ Dorper x ½ Santa Inês were housed individually in covered bays. The experiment lasted 84 days, divided into three sub-periods of 28 days. The basal ration consisted of pre-dryng Tifton, ground corn, soybean meal, limestone and mineral mixture. The experimental diets were: 1) basal ration + 25 mg of monensin per kg/DM, 2) basal ration + 1.25 mL, 3) basal ration + 2.50 mL and 4) basal ration + 3.75 mL of essential oil of thyme per kg/DM. There was no gain difference in average daily gain between treatments in the total period. The second period had the best performance of the animals. Infestation by coccidiosis was lower in the diet with monensina. The levels of the additives used not showed improvement in performance lambs fed with high content of forage. However, monensin was able to control coccidiosis. (AU) | |
| FAPESP's process: | 13/20070-3 - Essential oil of white thyme (thymus vulgaris) as handler of ruminal fermentation |
| Grantee: | Angelo Dias Brito Ribeiro |
| Support Opportunities: | Scholarships in Brazil - Master |