مقاله ای درمورد ترکیب دانه های جو و ذرت در مکمل های روغنی جیره
مقاله ای درمورد ترکیب دانه های جو و ذرت در مکمل های روغنی جیره
Reciprocal combinations of barley and corn grains in oil-supplemented diets: Feeding behavior and milk yield of lactating cows
Abstract
The effect of barley-based (BBD) or corn-based diets (CBD), or their equal blend (BCBD) on dry matter (DM) intake, feeding and chewing behavior, and production performance of lactating dairy cows was evaluated. Nine multiparous Holstein cows (75.6 ± 11.0 d in milk) were used in a triplicate 3 × 3 Latin square design with 21-d periods. Forage-to-concentrate ratio (40:60), forage neutral detergent fiber (20% of DM), total neutral detergent fiber (>29% of DM), and geometric mean particle size (4.3 mm) were similar among treatments. Meal patterns, including meal size and intermeal interval, were not affected by the dietary treatments and DM intake (25.6 kg/d) was not different among treatments. Ether extract intake increased linearly with increasing amount of the corn grain in the diets. Due to similar feed intake, actual milk (48.6 kg/d), 4% fat-corrected milk (36.8 kg/d), and fat- and protein-corrected milk (38.1 kg/d) yields were not affected by treatments. Average milk protein percentage and yield were 2.83% and 1.37 kg/d, respectively, and were not different across treatments. Milk fat percentage increased linearly with increasing amount of corn grain in the diets and was greater in CBD relative to BCBD but not BBD (2.31, 2.28, and 2.57%, for BBD, BCBD, and CBD, respectively). However, milk fat yield tended to show a linear increase as the amount of corn grain included in the diets increased. Results indicated that changing diet fermentability by replacing barley grain for corn grain in oil-supplemented diets did not influence feeding patterns and thereby no changes in feed intake and milk yield occurred
Abstractخلاصه
equalشبیه،یکسان
blendآمیخته گری کردن
chewingجویدن
lactatingشیرده
multiparousچندشکم زا
productionتولید و پرورش
performanceعملکرد
Forageعلوفه
extractعصاره
Latin squareطرح مربع لاتین
detergentمواد شوینده
actualواقعی
concentrateچسباندن
percentageبرحسب درصد
treatmentsتیمارها
correctedاصلاح شده
BBD=Barley Based Diet=جیره غذایی بر اساس جو
corn-based diets (CBD)=جیره غذایی بر اساس ذرت
BCBD=Barley and corn Based Diet=جیره غذایی بر اساس ذرت و جو
relativeخویشاوندی
intakeمصرفی
fermentabilityقابل تخمیر
mealکنجاله،پودر