نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد گرایش تغذیه دام، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی کرج، دانشگاه تهران، کرج، البرز، ایران. کد پستی: 3158777871
2 استادیار گروه علوم دامی، پردیس کشاورزی و منابع طبیعی کرج، دانشگاه تهران، کرج، البرز، ایران. کد پستی: 3158777871
3 استاد گروه مهندسی علوم دام، دانشکده علوم و مهندسی کشاورزی دانشگاه تهران
4 گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران. کد پستی: 3158777871
چکیده
به منظور بررسی اثر متقابل فصل و اندازه ذرات علوفه جیره بر تولید و ترکیبات شیر گاوهای شیرده پرتولید، از تعداد 100 رأس گاو هلشتاین اوایل دوره در دو فصل بهار و تابستان (هر فصل از 50 راس) در قالب دو تیمار حاوی علوفه یونجه با اندازه ذرات درشت (میانگین هندسی 7/7 میلی متر) و تیمار حاوی علوفه یونجه با اندازه ذرات ریز (با میانگین هندسی 4/2 میلی متر) استفاده شد. مقدار ماده خشک مصرفی گاوها به صورت گروهی و همچنین تولید شیر گاوها به صورت انفرادی ثبت شد. نتایج نشان داد که میزان تولید شیر، درصد پروتئین، لاکتوز و کل مواد جامد شیر درفصل بهار در مقایسه با فصل تابستان بیشتر بود (p<0/01). تولید شیر خام و نیز درصد لاکتوز شیر گاوهای تغذیه شده با جیره حاوی علوفه ریز در مقایسه با جیره حاوی علوفه درشت، تمایل به افزایش داشت (p<0/01). مقدار مصرف ماده خشک از جیره حاوی علوفه با اندازه ذرات درشت در مدت زمان صفر الی دو ساعت پس از خوراک دهی صبح در فصل تابستان بیشتر از فصل زمستان بود (p<0/01). بطور کلی گاوهایی که با خوراک حاوی علوفه با اندازه ذرات ریز تغذیه می شوند الگوی مصرف خوراک یکنواخت تری در طول فصول بهار و تابستان دارند.
کلیدواژه‌ها
عنوان مقاله [English]
Interaction effects of season and dietary forage particle size on milk yield and composition in early lactating Holstein dairy cows
نویسندگان [English]
- Somayeh Jalalinia 1
- Farhang Fatehi 2
- Mehdi Dehghan banadaky 3
- Hossein Rokhforoz 4
1 MSc. Student in Animal Nutrition, Department of Animal Sciences, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran. PC:+983158777871
2 Assistant Professor, Department of Animal Sciences, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran. PC:+983158777871
3 faculty member
4 Department of Animal Science, College of Agricultural and Natural resources, University of Tehran, Karaj, Iran. PC: 3158777871
چکیده [English]
To investigate the interaction effects between season and dietary forage particle size on milk yield and composition, one hundred early lactating Holstein were allocated. Dietary forage particle size included long (7.7 mm) and fine (4.4 mm), were adjusted as an experimental treatment per season. The results showed that raw milk yield, protein, lactose and total solid percentage of milk were higher within spring compared to summer (p< 0.01). Milk yield and milk lactose percentage for cows fed fine forage particle size trended to be higher than cows fed long forage particle size. Also, the amount of dry matter consumed within two hours after feeding for summer was higher than spring. Totally results revealed that cows fed with fine forage particle size had more homogeneous feeding behavior pattern within both studied season than cows fed long forage particle size.
کلیدواژه‌ها [English]
- Early lactating Holstein cows
- forage particle size
- heat stress
- milk yield
- milk composition
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