| Full text | |
| Author(s): |
Macedo, Fernanda Lopes
;
Batistel, Fernanda
;
de Souza, Jonas
;
Chagas, Lucas Jado
;
Portela Santos, Flavio Augusto
Total Authors: 5
|
| Document type: | Journal article |
| Source: | TROPICAL ANIMAL HEALTH AND PRODUCTION; v. 48, n. 8, p. 1593-1598, DEC 2016. |
| Web of Science Citations: | 0 |
| Abstract | |
In this study, we investigated the associative effects of concentrate levels and Ca salts of soybean oil (CSSO) supplementation on performance and ruminal parameters of mid-lactation dairy cows grazing on tropical pasture. Twenty-four Jersey x Holstein cows were used in a randomized block design and assigned to four treatments arranged in a 2 x 2 factorial design. Factors evaluated were concentrate levels (low, 3 kg/day vs. high, 7 kg/day of concentrate) and CSSO supplementation (without CSSO vs. with 250 g CSSO cow/day). All cows grazed on elephant grass (Pennisetum purpureum cv. Cameroon) and received the supplemental treatments for a 90-day period. The high concentrate level decreased forage intake and grazing time. In addition, the high concentrate level increased rumen propionate concentration and microbial synthesis and tended to decrease ammonia-N compared with low concentrate level. The addition of CSSO tended to decrease valerate, isobutyrate, isovalerate, and microbial synthesis. In conclusion, feeding CSSO for mid lactating cows grazing on tropical pasture had negative effects on rumen function. In contrast, CSSO supplementation tended to interact with concentrate level and increased energy intake when fed at low concentrate level. Feeding the high level of concentrate was an effective strategy to increase energy intake and microbial synthesis and improve N utilization. (AU) | |
| FAPESP's process: | 10/20223-6 - Levels of concentrate with or without inert fat for lactating dairy cows fed on tropical grass |
| Grantee: | Flávio Augusto Portela Santos |
| Support Opportunities: | Regular Research Grants |