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Previous issue date: 2008-04-29 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The search of better quality of the milk induces that changes and advances should be reached
trought manipulation of de diet of the animals. The evaluation of the food absorption
processes have been a very important in the investigation of the animal nutrition. The
objective was to evaluate the on ruminal fermentation parameters in high yielding dairy cows
fed total mixed ration (TMR). Eighteen Holstein cows in initial third of lactation were
distributed to three groups. Cows were fed ad libitum thirty a day. The diet containing corn
silage, barley, cottonseed and commercial ration, with forage:concentrate ratio of 45:55.
Ruminal fluid was used for sampling at 0, 2, 4 and 6 hours after first meal for determination
of ammonia, pH and VFA. The daily average intakes of nutrients, coefficients digestibility
and milk production was evaluated how index of the production. There was no effect for
averages of molar ruminal concentration ammonia. Was different, 4 hour after fed for the
parameters: pH, VFA, acetic, butyric acids evidencing intense ruminal fermentative activity.
Total VFA and pH was different in 4 hour after fed. The values of the propionic acid had
followed the same trend of the AGV but they had not presented significant difference, the
relation acetate: propionato was remained above of 3, keeping adjusted the text of fat of milk.
This study demonstrates that the use of total diet provided a ruminal environment with
adequate conditions of fermentation without large oscillations, what it diminishes the
incidence of metabolic riots in cows of high production. / As melhores mudan?as na produ??o do leite podem ser atingidas atrav?s da manipula??o da
dieta dos animais. Avaliar os processos de absor??o de alimentos direcionados para a s?ntese
do leite tem sido de grande import?ncia nas pesquisas de nutri??o animal O objetivo deste
trabalho foi avaliar os par?metros ruminais de vacas de alta produ??o alimentadas com dieta
total. Dezoito animais da ra?a Holandesa, no primeiro ter?o de lacta??o, foram divididos em
tr?s grupos, por ordem de pari??o. Os animais receberam dieta total ? vontade (ad libitum)
tr?s vezes ao dia composta por silagem de milho, cevada ?mida, caro?o de algod?o e ra??o
comercial, com a rela??o volumoso:concentrado de 45:55. Amostras de l?quido ruminal foram
coletadas nos hor?rios de 0, 2, 4 e 6 horas, ap?s a alimenta??o, no per?odo da manh?, sendo
utilizadas para determina??es das concentra??es de am?nia, pH e AGV do l?quido ruminal.
Os valores de consumo m?dio di?rio, coeficiente de digestibilidade, produ??o de leite foram
avaliados como indicadores da produ??o. N?o foi observado efeito significante nas
concentra??es m?dias ruminais de am?nia. Na quarta hora ap?s a alimenta??o foi observada
diferen?a significativa dos par?metros: pH, AGV total, ?cidos ac?tico e but?rico, evidenciando
a intensa atividade fermentativa ruminal. Os valores m?dios de ?cido propi?nico seguiram a
mesma tend?ncia dos AGV mas n?o apresentaram diferen?a significativa, a rela??o
acetato:propionato manteve-se acima de 3, mantendo adequado o teor de gordura do leite.
Este trabalho demonstra que o uso de dieta total proporcionou um ambiente ruminal com
condi??es adequadas de fermenta??o sem grandes oscila??es, o que diminui a incid?ncia de
dist?rbios metab?licos em vacas de alta produ??o.
| Identifer | oai:union.ndltd.org:IBICT/oai:localhost:tede/589 |
| Date | 29 April 2008 |
| Creators | Pelegrino, Stela Gomes |
| Contributors | Matos, Nelson Jorge Moraes |
| Publisher | Universidade Federal Rural do Rio de Janeiro, Curso de P?s-Gradua??o em Zootecnia, UFRRJ, Brasil, Produ??o Animal |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ |
| Rights | info:eu-repo/semantics/openAccess |
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