| Full text | |
| Author(s): |
Jado Chagas, Lucas
[1]
;
Delveaux Araujo Batalha, Camila
[2]
;
de Arruda Camargo Danes, Marina
[3]
;
Mauricio Santos Neto, Jose
[4]
;
Lopes Macedo, Fernanda
[5]
;
da Silva Marques, Rodrigo
[6]
;
Augusto Portela Santos, Flavio
[5]
Total Authors: 7
|
| Affiliation: | [1] Dept Res & Dev, Roullier Anim Nutr, Minga Guazu - Paraguay
[2] Ctr Avancado Pesquisa Bovinos Corte, Inst Zootecnia, Sertaozinho - Brazil
[3] Univ Lavras, Dept Anim Sci, Lavras - Brazil
[4] Michigan State Univ, Dept Anim Sci, E Lansing, MI 48824 - USA
[5] Univ Sao Paulo, Dept Anim Sci, Sao Paulo - Brazil
[6] Montana State Univ, Dept Anim & Range Sci, Bozeman, MT 59717 - USA
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | ANIMAL SCIENCE JOURNAL; v. 92, n. 1 JAN 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
This experiment was designed to evaluate the effects of different concentrate crude protein (CP) concentration on performance, metabolism and efficiency of N utilization (ENU) on early-lactation dairy cows grazing intensively managed tropical grass. Thirty cows were used in a ten replicated 3 x 3 Latin square design. The treatments consisted of three levels of concentrate CP: 7.9%, 15.4%, and 20.5% offered at a rate of 1 kg (as-fed basis)/3 kg of milk. The cows fed low and medium CP had negative balance of rumen degradable protein and metabolizable protein. Increasing CP tended to linearly increase DMI, 3.5% FCM and milk casein, and linearly increased the yields of milk fat and protein. Increasing CP linearly increased the intake of N, the concentration of rumen NH3-N, and the losses of N in milk, urine, and feces. Increasing dietary CP linearly increased the molar proportion of butyrate but had no effect on the other rumen VFAs and no effect on microbial yield. In conclusion, feeding a concentrate with 20.5% of CP to early-lactation dairy cows grazing tropical grasses, leading to a 17.8% CP diet, tended to increase DMI, increased the yield of 3.5% FCM and the milk N excretion, and decreased ENU by 32%. (AU) | |
| FAPESP's process: | 12/09535-1 - Beef and dairy cattle supplementation in tropical pasture |
| Grantee: | Flávio Augusto Portela Santos |
| Support Opportunities: | Research Projects - Thematic Grants |