CIFICEN   24414
CENTRO DE INVESTIGACIONES EN FISICA E INGENIERIA DEL CENTRO DE LA PROVINCIA DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Nitrogen utilization and methane emission in lactating cows fed diets with different nitrogen contents
Autor/es:
LOMBARDI,BANIRA; GONDA, HORACIO L.; TIERI, MARÍA PAZ; GUZMAN, SERGIO A.; COMERÓN, EDUARDO ALBERTO; JULIARENA, M. PAULA
Lugar:
Foz do Iguazú
Reunión:
Conferencia; Greenhouse Gas and Animal Agriculture Conference 2019; 2019
Institución organizadora:
Embrapa, INIA, INTA, UNESP
Resumen:
Dietary nitrogen utilization, enteric methane emission, and milk production and composition in dairy cows fed diets with different crude protein contents were studied. Twelve Holstein multiparous cows averaging 70 days in milk, 645 kg of body weight, 2.80 body score, and 35 kg of milk yield, were randomly assigned to 1 out of 3 diets, arranged in 6 sequences, according to a replicated 3 × 3 Latin square design. Dietswere composed, on dry matter basis, of 27% lucerne hay, 31% maize silage and 42% concentrate based on maize grain (MG) and soybean meal (SBM). Proportions of MG and SBM were such to result in diets with 13, 16 and 19% crude protein contents. Throughout the trial, cows were kept in individual pens. Each experimental period lasted 29 d (20 d for adaptation and 9 d of data and sample collection: 3 d for nitrogen balance, 1 d for blood sampling, and 5 d for enteric methane emission ‐SF 6 technique‐). Dry matter intake (23.8 kg/cow/d) and digestibility (74.7%) were similar among treatments. While increasing crude protein intake resulted in a significant increase (P