نوع مقاله : مقالات علمی- پژوهشی
نویسندگان
1 گروه علوم دامی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران
2 علوم دامی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران
3 گروه علوم دامی، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران.
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
In order to determine the effects of substitution of barley grain with dried citrus pulp (DCP) on eight lactating Holstein cows
with average body weight of 550 ± 50 kg and 75 ± 15 days in milk were allocated to 4 dietary treatments, which were diet;
the control with 0% dried citrus pulp (DCP) and 15% barley grain, diet 2, 3 and 4 containing 5, 10 and 15% DCP and 10, 5
and 0% barley grain respectively. Each period lasted for 21 days including 14 days adaptation and 7 days sample collection.
Dry matter intake (DMI) body was not affected by DCP substitution, although, the DMI tended to decrease with increasing
level of DCP. Results showed that increasing levels of DCP in diets had no significant effect on apparent digestibility, blood
urea N and glucose, milk yield and composition and ruminal N-NH3, but ruminal pH was significantly lower for cows fed T1
and T2 compare to T3 and T4. The ruminal N-NH3 of diets 1, 2, 3 and 4 were 20.08, 19.96, 19.53 and 19.01 mg/dl and the
ruminal pH 6.45, 6.52, 6.69 and 6.71 respectively. The time spent eating; ruminating and total chewing activities were not
influenced different treatments. It was concluded that DCP can be substituted by barley grain up to 15% without any alters
affects on dairy cow production performances
کلیدواژه‌ها [English]
)
ارسال نظر در مورد این مقاله