Supplementation of alfalfa silage with different energy-rich concentrates in diets for lactating dairy goats

• Jose Luis Danelon ^[2] ; Mariana D´Alesio ^[2] ; Luis Barletta ^[2] ; Patricia Andrea Allocati ^[1] ; Marisa Wawrzkiewicz ^[1] ; Elsa Ceballos ^[1] ; Claudio Colatto ^[3] ; Daniel Victoria ^[4]
  1. [1] Universidad de Buenos Aires

     Universidad de Buenos Aires

     Argentina

     
  2. [2] Facultad de Agronomia, Univ. de Buenos Aires
  3. [3] Universidad de La Plata, Provincia de Buenos Aires
  4. [4] Facultad de Veterinaria de Esperanza (Santa Fe).

  Mostrar afiliaciones +
• Localización: Archivos Latinoamericanos de Producción Animal, ISSN 1022-1301, ISSN-e 1022-1301, Vol. 18, Nº. 1-2, 2010
• Idioma: inglés
• Enlaces
  • Texto completo
• Resumen

  • Lactating Saanen does were fed diets based on ad libitum alfalfa silage (SA) to study the effects of including fixed amounts of three different energy-rich concentrates: wheat grain (T), sorghum grain (S), and dehydrated citrus pulp (PC), in a 4 x 4 Latin Square with four replicates. Sixteen does (45 ± 10 d postpartum and producing 2.016 ± 0.58 kg/d of 4% fat corrected milk, FCM) housed in individual pens under roof, received the following diets: 1) SA (33.9% DM, 19.9% CP, 44% NDF); 2) SAT (52.4% DM, 19.8% CP, 33.7% NDF); 3) SAS (50.9% DM, 17.9% CP, 37% NDF); and 4) SAPC (52.5% DM, 16.1% CP, 39.1% NDF), resulting in respective forage-to-concentrate ratios (F:C) of 100:0. 65:35, 67:33, and 64:36. Daily DM intake from silage was greater for SA than for the other three treatments combined (2.55 vs. 2.33% of body weight, BW) whereas total DM intake (g/kg BW0.75) was lower (74.9 vs. 95.4). Yields of FCM or fat-protein-corrected milk were affected positively by concentrate supplementation, but milk protein concentration (g/L) or yield (g/d) were not. Chewing efficiency (min/g NDF consumed per kg BW0.75) improved from 20.4 to 15.0 (P