1 research outputs found
Effect of magnesium oxide (mgo) addition in diets for lactating holstein cows
Se evalu贸 el efecto de adici贸n de 贸xido de magnesio (MgO) en
dietas para vacas Holstein sobre la producci贸n 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 d铆as de lactancia
y producci贸n de leche. Las vacas fueron asignadas al
azar a dos grupos o tratamientos (T): T1 recibi贸 0,2%, y T2 recibi贸
0,4% de MgO. El MgO (agente alcalinizante) se mezcl贸
con un concentrado comercial y se ofreci贸 en el comedero junto
con la dieta total, la cual consisti贸 de 9 kg/d del concentrado
mas heno de alfalfa ad libitum. La dieta total se ofreci贸 3 veces
al d铆a (06000, 1200 and 1700 h). El periodo experimental fue
de 30 d, con otros 30 d de adaptaci贸n. Se evalu贸 la producci贸n
de leche (kg/d) y la calidad de la leche (grasa, prote铆na, y
s贸lidos totales). Los datos se analizaron por medio del paquete
estad铆stico SAS en un dise帽o de bloques al azar. Los animales
en T2 (0,4% MgO) produjeron m谩s leche (2,5 kg/d;
P<0,05) que aquellos en T1 (0,20% MgO). El contenido de
grasa, prote铆na, y s贸lidos totales en leche fue m谩s alto
(P<0,05) en T1 que en T2. Se concluye que la adici贸n de
0,40% de MgO en dietas para vacas lactantes incrementa la
producci贸n de leche, sin embargo puede haber una peque帽a
reducci贸n en la calidad de la leche, comparado con la suplementaci贸n
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