نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی کرج، دانشگاه تهران، ایران.
2 استادیار، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی کرج، دانشگاه تهران، کرج، ایران.
3 دانشیار، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی کرج، دانشگاه تهران، کرج، ایران.
چکیده
هدف از مطالعه حاضر بررسی استفاده از ویناس در جیره گاوهای هلشتاین اواسط دوره شیردهی تحت شرایط تنش گرمایی بر تولید و ترکیب شیر، گوارش‌پذیری ظاهری مواد مغذی و فراسنجه‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌های اقتصادی بود. آزمایش روی 84 رأس گاو شیرده با روزهای شیردهی 25±155 و تولید شیر 3 ±32 لیتر در روز در قالب طرح کاملاً تصادفی انجام شد. حیوانات به‌طور تصادفی در یکی از سه تیمار 1- شاهد (جیره بدون ویناس)، 2- پنج درصد (2/2 کیلوگرم) و 3- 10 درصد (4/4 کیلوگرم در روز) ویناس براساس ماده خشک قرار گرفتند. مطالعه در تابستان با میانگین شاخص حرارتی- رطوبتی 75/1، اجرا شد و طول دوره 25 روز (15 روز عادت‌دهی و 10 روز نمونه‌گیری) بود. ماده خشک مصرفی برای تیمار حاوی 10 درصد ویناس در مقایسه با سایر تیمارها بالاتر بود (05/0>P). بازده خوراک در تیمار حاوی پنج درصد ویناس در مقایسه با سایر تیمارها بالاتر بود (0/05>P). گوارش‌پذیری ظاهری ماده خشک و NDF با افزایش سطح ویناس در جیره‌ها در مقایسه با تیمار شاهد افزایش یافت (0/05>P). شاخص اقتصادی درآمد پس از کسر هزینه خوراک برای جیره حاوی پنح درصد ویناس بیش‌ترین بود. براساس نتایح حاصل، استفاده از ویناس به میزان پنج درصد ماده خشک جیره گاوهای شیری در شرایط تنش گرمایی، بدون اثر منفی بر مصرف ماده خشک، سبب بهبود گوارش‌پذیری مواد مغذی و کاهش هزینه تمام‌شده خوراک می‌شود.
کلیدواژه‌ها
عنوان مقاله [English]
Effect of dietary supplementation of Condensed Molasses Soluble (Vinasse) on milk yield and apparent nutrient digestibility in lactating Holstein cows under heat stress
نویسندگان [English]
- Amin Rahimi 1
- Farhang Fatehi 2
- Abolfazl Zali 3
1 Department of Animal Sciences, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran. PC:+983158777871
2 Assistant Professor, Department of Animal Science, Faculty of Agricultural Science and Engineering, College of Agricultural and Natural Resources, University of Tehran, Karaj, Iran
3 Associate Professor, Department of Animal Science, Faculty of agricultural science and engineering, College of Agricultural and Natural Resources, University of Tehran, Karaj, Iran. PC: +983158777871
چکیده [English]
The current study was conducted to investigate the effect of dietary supplementing of condensed molasses soluble (Vinasse) in heat stressed mid-lactating Holstein cows on milk yield and composition, apparent nutrient digestibility and economical parameters. The experiment was performed by 84 Holstein lactating dairy cows (DIM: 155±25; MY: 32±3) in a completely randomized design with three treatments 1) basal diet without vinous (control), 2) diet containing 5% of vinasse (2.2 kg/head/day) and 3) diet containing 10% 0f vinasse (4.4 kg/head/day). The study was conducted in the summer season with a temperature -humidity index of 75.1. The experiment lasted for 25 days (15 days for adaptation and 10 days for sampling). Dry matter intake of the treatment fed a 10% vinasse supplemented diet was higher than the other treatments (P<0.05). Dry matter and NDF digestibility coefficients were increased by increasing the level of vinasse in the diets, compared to the control (P<0.05). The economical index of income over feed cost was the highest for the diet containing 5% of vinasse. Totally, regarding to the chemical composition of the vinasse and its beneficial impacts on the performance of the cows under heat stress, using 5% of dry matter vinasse supplementation (2.2 kg wet weight/day or 1.1 kg dry matter/day) can improve nutrient digestibility and reduce feed costs without any adverse effects on dry matter intake.
کلیدواژه‌ها [English]
- Economical indices
- Heat stress
- Mid-lactating cows
- Milk yield and components
- Vinasse
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