Effect of different inclusion levels of canola oil in the diet of dairy cows on intake, ruminal and blood parameters

• Grant number: 13/20883-4
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2013
• End date: October 31, 2014
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
• Principal Investigator: Arlindo Saran Netto
• Grantee: Bárbara Roqueto dos Reis
• Host Institution: Faculdade de Zootecnia e Engenharia de Alimentos (FZEA). Universidade de São Paulo (USP). Pirassununga , SP, Brazil

Abstract

Objective with this study was to evaluate the effect of different inclusion levels of canola oil in the diet of dairy cows on intake, ruminal and blood parameters. Will be used 18 Holstein cows, which distributed in 3x3 Latin square according to the following treatments: T1 = control diet, T2 = 3% inclusion of canola oil in the diet and T3 = 6% inclusion of canola oil in the diet . The animals will be housed in individual pens for evaluation of voluntary intake with 10% left in the trough. The diets are based on corn silage, soybean meal, ground corn, urea and common salt, which will be formulated on the recommendations of NRC (2001) and formulated to be isonitrogenous and isocaloric. The dry matter intake will be assessed throughout the experimental period, with heavy supply and leftovers daily. The remaining variables are: blood variables (non-esterified fatty acids, glucose, urea, triglycerides, urea nitrogen, betahidroxibutirato, albumin, total protein, total cholesterol, HDL, LDL, creatine kinase (CK), gamma glutamyl transferase (GGT) , aminotrasferase aspartate (AST), superoxide dismutase (SOD)); ruminal variables (pH, ammonia and volatile fatty acids). The results will be analyzed by the computer program Statistical Analysis System ® (SAS, 2001), by the command-Proc MIXED of SAS, adopting a significance level of 5% according to the following model: Yijkl = ¼ + Ti + Qj + A (Q) k + Pl + eijkl. (AU)