نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه علومدامی، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران
2 گروه علومدامی، دانشکده کشاورزی، دانشگاه ارومیه، ارومیه، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
This research aims to investigate the effect of a feeding fat supplement containing an additive (lecithin or bile powder) with the physical form of flake or granule on the apparent digestibility of nutrients and some blood parameters in Holstein dairy cows. 48 lactating cows were used during two experimental periods in a 2x3x2 completely randomized factorial design and randomly grouped into 6 experimental treatments: 1. Control diet + 2.5% granulated fat supplement, 2. Control diet + 2.5% granulated fat supplement containing 5% lecithin 3. Control diet + 2.5% granulated fat supplement containing 5% bile powder 4. Control diet + 2.5% Flaked fat supplement 5. Control diet + 2.5% Flaked fat supplement containing 5% lecithin and 6. Control diet + 2.5% Flaked fat supplement containing 5% bile powder. All the experimental diets were balanced according to the recommendations of the National Research Association. All data were analyzed by statistical software. The addition of lecithin or bile powder average milk production, ECM, 3.5% FCM, milk fat, protein, lactose, solids, solids nonfat, SCC, denovo fatty acids, mixed fatty acids, preformed fatty acids, saturated fatty acids, unsaturated fatty acids, mono unsaturated fatty acids, poly unsaturated fatty acids, stearic acid, palmitic acid and oleic acid (P ≥ 0.05). The addition of emulsifiers to the fat supplement of the high-production dairy cow diet may have positive effects on the production performance, milk compositions and source of fatty acids.
کلیدواژهها [English]
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