부산대학교 도서관

The objective was to evaluate the ruminal and blood parameters of grazing Nellore bulls, on Marandu pasture, in the summer season, receiving different sources of true protein and presence or absence of essential oil in the supplement. Twelve rumen-cannulated cattle (590 ± 50 kg) were used in a 4 × 4 triple Latin square design. Factors included: 1) soybean meal or SoyPass®(rumen bypass protein supplement), and 2) with or without CinnaGar®essential oil. The supplement was provided daily (0900 h) in the amount of 3 g/kg of BW. Ruminal fluid samples were collected, each period, at zero (before supplementation) and 6, 12 and 18 hours after supplementation. Blood samples were collected at zero, 2, 4 and 6 hours after supplementation. There was not triple interaction (P≥0.08) between the factors. The pH of the ruminal liquid was influenced by hour (P<0.01). At time zero, pH was 6.78 and decrease over time, on average the pH was 6.51. Animals supplemented with CinnaGar®had 7% greater isovalerate concentration (P=0.02) compared to animals without CinnaGar®. There was interaction between hour and protein source (P=0.03), at the time zero, valerate concentration was greater for animals receiving SoyPass®compared to animals receiving soybean meal. The ruminal ammonia nitrogen was 53% greater at 6 hours after supplementation compared to the other times (P<0.01). Blood urea was influenced by the presence of essential oil (P=0.03). Animals supplemented with CinnaGar®presented 22% greater urea concentration compared to animals without CinnaGar®. The highest blood glucose concentration was observed for animals receiving SoyPass®and essential oil (P<0.01). In conclusion, the collection time affects ruminal parameters and glucose blood in grazing Nellore cattle. Also, the essential oil affects isovalerate and blood urea in grazing Nellore cattle.