Glicerina associada à ureia na alimentação de bovinos Nelore

• Autor(a) principal: D'Aurea, André Pastori [UNESP]
• Data de Publicação: 2014
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/113989
• topic: Bovino de corte - Nutrição; Nelore (Zebu); Biodiesel; Glicerina; Carne bovina; Desempenho; Glycerin

The objective of this research was to investigate the combination of glycerol with urea in the diet of Nellore cattle , as the productive performance , meat characteristics , ruminal fermentation , digestibility and microbial mass . The study was divided into two experiments . In the first experiment , 28 heifers ( 20 months Nelore breed, initial body weight = 277kg , ) were distributed so entirely casualisada to four treatments which were tested diets you experience . C = control without glycerin and urea, U = 1 % urea in dry matter ; G10 = 10 % glycerin dry matter ; GU10 = 10 % glycerin and 1 % urea in dry matter . During 100 days of confinement , evaluated the dry matter intake , weight gain and feed efficiency . After this period there was the slaughter of animals , which was obtained by the hot carcass yield , fat thickness , ribeye area and removed meat samples . The second experiment added two new diets : G20 = 20 % glycerin in dry and GU20 = 20 % glycerin and 1 % urea in dry matter. Six animals fitted with rumen cannulas Nellore were used to verify the parameters pH , ammonia nitrogen , digestibility and microbial mass distributed in a 6x6 Latin square . The glycerin decreases the digestibility of the fiber . There influence of diets on the growth of rumen microorganisms in rumen pH and ammonia nitrogen , which does not cause effect on performance and meat quality