• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
https://doi.org/10.11606/D.10.2011.tde-25092012-155140
Document
Author
Full name
Elmeson Ferreira de Jesus
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Pirassununga, 2011
Supervisor
Committee
Santos, Marcos Veiga dos (President)
Saran Netto, Arlindo
Silva, Luis Felipe Prada e
Title in Portuguese
Fontes nitrogenadas e teor de proteína bruta em dietas com cana-de-açúcar para vacas lactantes: consumo, digestibilidade, fermentação ruminal, balanço de energia, produção e composição do leite
Keywords in Portuguese
composição do leite
Degradabilidade
Fontes proteicas
Produção
Abstract in Portuguese
O objetivo foi avaliar o efeito de teores de proteína bruta (PB) (14,5 vs 16%) e da fonte nitrogenada na dieta de vacas leiteiras em lactação sobre o consumo e digestibilidade da matéria seca (MS) e nutrientes, fermentação ruminal, produção e composição do leite e balanço de energia, utilizando cana-de-açúcar como volumoso. Foram utilizadas 12 vacas Holandesas com média de 235 dias em lactação, agrupadas em três quadrados latinos 4x4 contemporâneos, com período experimental de 21 dias, sendo 14 para adaptação às dietas e os 7 últimos para coletas. As vacas foram alimentadas "ad libitum' com rações isoenergéticas, com duas fontes nitrogenadas principais (farelo de soja e uréia) e dois teores de PB (14,5 e 16,0 %) na dieta: A) 16% PB e farelo de soja (FS) como fonte nitrogenada, com 65% de PDR; B) 14,5% PB e uréia (U) como fonte nitrogenada, com 70% de PDR; C) 16% PB U e 70% de PDR; D) 14,5% PB FS e 65% de PDR na MS. As amostras de leite para análise da composição foram coletadas do 14º ao 17º dia de cada período. As amostras de líquido ruminal foram coletadas com a utilização de sonda esofágica, três horas após a alimentação matinal. A digestibilidade foi determinada por meio de indicador interno FDAi. Não houve efeito das dietas sobre o consumo de MS (Kg/dia), de energia líquida de lactação (Mcal/dia), coeficiente de digestibilidade em porcentagem e consumo em porcentagem do peso vivo. Houve interação entre fonte nitrogenada e teor de PB da dieta sobre o pH e relação acetato propionato. Houve tendência (P=0,052) da fonte nitrogenada para PB (kg/dia), na qual as dietas com farelo de soja apresentaram maior valor, quando comparada as dietas com ureia. A gordura do leite foi maior (4,06%) nas dietas com fonte nitrogenada ureia , em relação a fonte nitrogenada FS com (3,5%).
Title in English
Nitrogen sources and level of crude protein in diets with sugar cane for lactating cows: intake, digestibility, rumen fermentation, energy balance, milk production and composition
Keywords in English
Degradability of protein sources
Milk production and composition
Abstract in English
The objective was to evaluate the effect of crude protein (CP) (14.5 vs. 16%) of the nitrogen source in the diet of lactating dairy cows on intake and digestibility of dry matter (DM) and nutrients, rumen fermentation, production and milk composition, energy balance, using sugar cane as forrage. We used 12 Holstein cows averaging 235 days in milk, grouped in three 4x4 contemporary Latin squares, with experimental period of 21 days, 14 for diet adaptation and 7 for sample collections. The cows were fed with diets isoenergetic "ad libitum", with two major nitrogen sources (soybean meal and urea) and two CP levels (14.5 and 16.0%) in diet: A) 16% CP soybean meal (SBM) as a nitrogen source, with 65% RDP; B) 14.5% CP and urea (U) as a nitrogen source, with 70% RDP; C) 16% CP U and 70% RDP; D) 14.5% CP and 65% FS RDP in DM. The milk samples for composition analysis were collected from the 14th to the 17th day of each period. The rumen fluid samples were collected using an esophageal tube , three hours after the morning feeding. The digestibility was determined by means of an internal indicator iADF. There was no effect of diets on the DM intake (kg / day), net energy for lactation (Mcal / day), percentage of digestibility and intake in percentage of body weight. There was interaction between nitrogen source and content of CP on pH and the acetate propionate ratio. There was a trend (P = 0.052) of source of nitrogen for CP (kg / day) in which diets with soybean meal had a higher value when compared with urea diets. Milk fat was higher (4.06%) in diets with urea nitrogen source, the source nitrogen compared with soybeans meal (3.5%).
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
ELMESON_F_JESUS.pdf (1.33 Mbytes)
Publishing Date
2013-04-17
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2024. All rights reserved.