Abstract #M443
Section: Ruminant Nutrition
Session: Ruminant Nutrition: General I
Format: Poster
Day/Time: Monday 7:30 AM–9:30 AM
Location: Gatlin Ballroom
Session: Ruminant Nutrition: General I
Format: Poster
Day/Time: Monday 7:30 AM–9:30 AM
Location: Gatlin Ballroom
# M443
Effect of dietary crude protein content on milk yield and composition in dairy cows fed diets based on rehydrated corn silage and sugar cane silage.
Marcos André Arcari1, Cristian Marlon de Magalhães Rodrigues Martins1, Juliano Leonel Gonçalves1, Dannylo Oliveira Sousa1, Bruna Gomes Alves*1, Alessandra Módena Orsi1, Marcos Veiga dos Santos1, 1Universidade de São Paulo, Pirassununga, SP, Brazil.
Key Words: milk, protein, rehydrated corn silage
Effect of dietary crude protein content on milk yield and composition in dairy cows fed diets based on rehydrated corn silage and sugar cane silage.
Marcos André Arcari1, Cristian Marlon de Magalhães Rodrigues Martins1, Juliano Leonel Gonçalves1, Dannylo Oliveira Sousa1, Bruna Gomes Alves*1, Alessandra Módena Orsi1, Marcos Veiga dos Santos1, 1Universidade de São Paulo, Pirassununga, SP, Brazil.
The aim was to evaluate the effect of dietary crude protein (CP) content on milk yield and composition for dairy cows fed with rehydrated corn silage (RCS) and sugar cane silage (SS). Fifteen Holstein cows were distributed in 3 contemporary 3 × 3 Latin square design and diets consisted of 600g / kg dry matter (DM) of SS, 400g / kg DM of RCS and CP levels (135, 161 and 186 g CP / kg DM) contained 89.9, 120.8 and 180.5 g soybean meal; 21.2, 40.4 and 50.5 g corn meal gluten and 6.7, 8.8 and 7.9 g urea / kg DM. The dry matter intake was 18.7 kg, 21.0 kg and 20.5 kg DM respectively. The data were analyzed using the MIXED procedure of SAS, were treatment effect was decomposed into 2 orthogonal polynomial contrasts (linear and quadratic). The CP content linearly increased the milk yield (P = 0.0005) (27.65, 29.88 and 30.32 L / day) [Y = 20.6593 (SE = 2.3976) + 0.5509 (SE = 0.1350) × CP] and 3.5% fat-corrected milk (P = 0.0002) (27.90, 30.63, 31.46 L / day) [Y = 18.6007 (SE = 2.8809) + 0.7275 (SE = 0.1643) × CP). There was a linear increase in the milk concentrations of fat (P = 0.045) (3.53, 3.64 and 3.71g / 100mL) [Y = 3.0605 (SE = 0.2827) + 0.03627 (SE = 0.01675) × CP), protein (P = 0.025) (2.82, 2.87 and 2.9g / 100mL) [Y = 2.6042 (SE = 0.1305) + 0.01728 (SE = 0.007107) × CP), casein (P < 0.0001) (2.08, 2.17 and 2.32g / 100mL) [Y = 1.4634 (SE = 0.06818) + 0.04644 (SE = 0.003836) × CP), total solids (P = 0.011) (11.91, 12.24 and 12.23%) [Y = 11.0888 (SE = 0.4023) + 0.06661 (SE = 0.02284) × CP), milk urea nitrogen (12.71, 18.44 and 18.95 mg / dL) [Y = −3.6595 (SE = 2.4423) + 1.2998 (SE = 0.1440) × CP) and casein percentage:milk protein ratio (P < 0.0001) (73.78, 75.61 and 79.88%) [Y = 58.0580 (SE = 3.4810) + 1.1727 (SE = 0.2044) × CP) for cows fed 135, 161 and 186 g CP / kg DM, respectively. And, there was a quadratic effect on the lactose content (P = 0.005) [Y = 1.8836 (SE = 0.8580) + 0.3406 (SE = 0.1127) × CP - 0.01091 (SE = 0.003650) × PB2). The increase in dietary CP content when cows were fed with RCS and SS caused an increase on milk yield and its main compounds solids.
Key Words: milk, protein, rehydrated corn silage
