Production, composition and protein fractions of milk from cows fed cottonseed meal and soybean

• Grant number: 12/01831-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: March 01, 2012
• End date: February 28, 2013
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
• Principal Investigator: Marcos Veiga dos Santos
• Grantee: William Rodrigo Sattin
• Host Institution: Faculdade de Medicina Veterinária e Zootecnia (FMVZ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The present study aims to evaluate the effects of two protein sources (cottonseed mealand crude soy beans) for different rates of degradability and increasing levels of crude protein in the diet (low and high) using thick cane-based sugarcane on production, composition and milk protein fractions. Will be used 12 adult cows (> 2° lactation) Holstein, in the intermediate stage of lactation (> 90 <200 days) with a live weight of approximately 550 kg, distributed in a Latin square 4 x 4, with 4 treatments and 4 periods 21 days and a total of 3 square contemporaries.Collections will be made of milk from two milkings (morning and afternoon) in the last 7 days of each experimental period. The diet will be provided in two meals daily (morningand afternoon). The 12 cows in the middle phase of lactation will be divided into 3 groups of 4 animals each and subjected to one of four diets formulated (13 PB and 15% FA, 13PB and 15% GS) to be isocaloric and to meet requirements a cow of 550 kg liveweight, producing 25 kg milk / day, based on the recommendations of NRC (2001), using as a bulky sugar cane and offered ad libitum to allow 50 to 10% of surplus. (AU)