5 research outputs found
Effect of magnesium oxide (mgo) addition in diets for lactating holstein cows
Se evaluó el efecto de adición de óxido de magnesio (MgO) en
dietas para vacas Holstein sobre la producción y calidad de la
leche. Diecinueve vacas Holstein en el segundo tercio de lactancia
fueron asignadas a dos tratamientos (T), con 9 y 10 animales.
Ambos tratamientos fueron similares para días de lactancia
y producción de leche. Las vacas fueron asignadas al
azar a dos grupos o tratamientos (T): T1 recibió 0,2%, y T2 recibió
0,4% de MgO. El MgO (agente alcalinizante) se mezcló
con un concentrado comercial y se ofreció en el comedero junto
con la dieta total, la cual consistió de 9 kg/d del concentrado
mas heno de alfalfa ad libitum. La dieta total se ofreció 3 veces
al día (06000, 1200 and 1700 h). El periodo experimental fue
de 30 d, con otros 30 d de adaptación. Se evaluó la producción
de leche (kg/d) y la calidad de la leche (grasa, proteína, y
sólidos totales). Los datos se analizaron por medio del paquete
estadístico SAS en un diseño de bloques al azar. Los animales
en T2 (0,4% MgO) produjeron más leche (2,5 kg/d;
P<0,05) que aquellos en T1 (0,20% MgO). El contenido de
grasa, proteína, y sólidos totales en leche fue más alto
(P<0,05) en T1 que en T2. Se concluye que la adición de
0,40% de MgO en dietas para vacas lactantes incrementa la
producción de leche, sin embargo puede haber una pequeña
reducción en la calidad de la leche, comparado con la suplementación
de 0,20% de [email protected] was evaluated the effect of magnesium oxide (MgO) addition
in diets for Holstein cows on milk production and quality. Nineteen
Holstein cows in second third of lactation were assigned
to two treatments (T), with 9 and 10 animals. Both treatments
were similar for days in lactation and milk yield. Cows were assigned
at random to two treatments (T) groups: T1 received
0.2% and T2 received 0.4% of MgO. The MgO (alkalinizing
agent) was mixed with a commercial concentrate and offered
in feed bunk with total diet, which consisted of 9 kg/d of concentrate
plus alfalfa hay fed ad libitum. Total diet was offered
three times a day (0600; 1200 and 1700 h). The experimental
period was of 30 d, with other 30 for adaptation. Milk production
(kg/d) and milk quality (fat, protein, and total solids) were
evaluated. Data were analyzed using the statistical package
SAS through of a randomized block design. Animals on T2
(0.40% MgO) produced 2.85 kg/d more milk (P<0.50) than
those on T1 (0.20% MgO). The fat, protein and total solids content
in milk were higher (P<0.05) in T1 than in T2. It is concluded
that the addition of 0.4% MgO in diets for lactating dairy
cows resulted in milk production increased, although there was
a small reduction in milk quality, compared with 0.2% MgO
supplementation
Evaluation of the effectiveness of a chamomile (Matricaria chamomilla) and linseed (Linum usitatissimum) saliva substitute in the relief of xerostomia in elders
© 2016 John Wiley & Sons A/S and The Gerodontology Association. Published by John Wiley & Sons Ltd Objective: The aim of this study was to determine the efficacy of a chamomile (Matricaria chamomilla) and linseed (Linum usitatissimum) saliva substitute in the relief of xerostomia in older participants. Background: In elders, xerostomia is a permanent and progressive condition that significantly affects their quality of life. The treatment for progressive xerostomia is currently restricted to palliative measures, and saliva substitutes are indicated. A lack of evidence on the effectiveness of the saliva substitutes in the relief of symptoms of xerostomia has been reported. Materials and methods: Seventy-four elderly participants presenting xerostomia of diverse origin were selected. Herbal saliva substitute and carboxymethyl cellulose conventional saliva substitute were tested using a double-blind, randomised, cross-sectional clinical trial. Results: Every participant of the study exhi
INFLUENCE OF TIME BETWEEN RUMINAL GLUCOSE CHALLENGES ON RUMEN FUNCTION
Ruminal lactic acidosis is one of the most important metabolic problems in feedlot cattle. Gradually transitioning cattle to finishing-feedlot diets may reduce the risk for ruminal acidosis by providing sufficient time for adaptation. This adaptation of feedlot cattle to high-concentrate diets may causes marked changes in the ruminal environment, and time is required to establish stable ruminal conditions. However, few studies have evaluated the ruminal adaptation in steers. A metabolism trial was conducted to evaluate the effects of two consecutive glucose challenges on rumen function in steers fed a high-energy finishing diet. Four Holstein steers (320 kg LW) with cannula in the rumen were used in a 4 x 4 Latin square design. Four treatments were used and consisted of the time elapsed between both challenges of glucose (2, 4, 6 or 8 d). Ruminal fluid samples were taken at 0700 h (just prior the first glucose challenge), and from the second challenge (d 2, 4, 6, or 8) at 1 h before and 2, 4, 6, 8, 28, 52, 124, 196 and 268 h. As the time between fluctuation of energy intake increased, ruminal fluid pH (P 0.10). During the first 6 h following the second glucose challenge ruminal fluid pH decreased. No effects of treatments on ruminal pH were observed (P >0.10) among treatments from 3 days after the second challenge. Ruminal fluid osmotic pressure increased (P <0.10) after dosed glucose with all treatments. Ruminal osmolality increased (P <0.10) as the time between challenges were 2 or 4 days. After dosed glucose, total volatile fatty acids increased, except by treatment 1 after second challenge. Total volatile fatty acid and pH were related positively (R2 =0.69). As the time increased, a tendency on increment of concentrations of protozoa was observed. Ruminal glucose concentration decreased linearly (P <0.10) 2 h after the second fluctuation of energy intake. We conclude that ruminal alterations are magnified as the time between glucose challenge decreases