Utilization of Urea and Urease Treated Rice Straw by Indigenous Growing Cattle

محورهای موضوعی : Camel

آ. اکتر ¹ ( Department of Animal Nutrition, Genetics and Breeding, Faculty of Animal Science and Veterinary Medicine, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh )
م. اسدوزمان ² ( Department of Dairy Science,Faculty of Animal Science and Veterinary Medicine, Sher-e-BanglaAgricultural University, Dhaka, Bangladesh )
م.م. حسین ³ ( Department of Animal Nutrition, Genetics and Breeding, Faculty of Animal Science and Veterinary Medicine, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh )
ال. اسد ⁴ ( Department of Animal Nutrition, Genetics and Breeding, Faculty of Animal Science and Veterinary Medicine, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh )

تاریخ دریافت : 1393/07/05 تاریخ پذیرش : 1393/11/11 تاریخ انتشار : 1394/06/10

کلید واژه: indigenous growing cattle, midden soil, Rice straw, urea and urease,

چکیده مقاله :

The experiment was conducted to study the effect of treatment of rice straw with urea and a urease containing midden soil on the chemical composition of treated rice straw, feed intake of the animals, nutrients digestibility, body weight gain, feed conversion efficiency and overall economy of feeding for a period of 105 days. Twelve indigenous growing cattle (live weight 130.00±1.67 kg) were selected and divided into four groups having three animals in each group. The animals received 3.0% urea + 2.0% midden soil treated rice straw (group A), 3.0% urea + 3.0% midden soil treated rice straw (group B), 3.0% urea + 4.0% midden soil treated rice straw (group C) and 3.0% urea + 5.0% midden soil treated rice straw (group D). In addition, all the animals were supplied with 2 kg green grass, 450 g concentrate mixture and 40 g salt per 100 kg body weight. Treatment of rice straw with 3.0% urea+ 2.0% midden soil lead to an increase in crude protein content from 3.30 to 7.08%, which was further increased by 7.40, 7.90 and 8.14% if treated with 3.0% urea + 3.0% midden soil, 3.0% urea + 4.0% midden soil and 3.0% urea + 5.0% midden soil, respectively. The total live weight gain by the end of the experimental period (105 days) was 39.00, 42.50, 46.50 and 49.00 kg for groups A, B, C and D respectively. The addition of 5.0% midden soil as a urease source with 3.0% urea (D) treated rice straw not only significantly (P<0.01) increased the coefficient of digestibility of dry matter (DM), crude protein (CP), crude fibre (CF), ether extracts (EE) and nitrogen free extract (NFE), but also significantly (P<0.05) increased the coefficient of digestibility of (OM) compared to treatment of rice straw with 3.0% urea + 4.0% midden soil (C), 3.0% urea + 3.0% midden soil (B) or 3.0% urea + 2.0% midden soil (A). Digestible organic matter (DOM), digestible crude protein (DCP), digestible crude fibre (DCF), digestible nitrogen free extract (DNFE) and total digestible nutrients (TDN) contents were significantly (P<0.01) higher in diet D, compared to diets A, B and C. Total profit of meat production in group D was significantly higher (P<0.01) than in groups A, B and C.

چکیده انگلیسی:

این آزمایش به منظور مطالعه اثر تیمار کاه برنج با اوره و خاک میدن (midden soil) حاوی اوره­آز، روی ترکیب شیمیایی کاه برنج، مصرف خوراک حیوانات، قابلیت هضم مواد مغذی، افزایش وزن بدن، راندمان تبدیل خوراک و بازده اقتصادی کلی تغذیه برای یک دوره 105 روزه انجام شد. دوازده گاو گوشتی بومی (وزن زنده 67/1±130 کیلوگرم) انتخاب و به چهار گروه حاوی سه حیوان در هر گروه تقسیم شدند. حیوانات، جیره­های حاوی کاه برنج تیمار شده با 1) 3 درصد اوره + 2 درصد خاک میدن (گروه A)، 2) 3 درصد اوره + 3 درصد خاک میدن (گروه B)، 3) 3 درصد اوره + 4 درصد خاک میدن (گروه C) و 3 درصد اوره + 5 درصد خاک میدن (گروه B)، دریافت کردند. به­علاوه، 2 کیلوگرم علوفه سبز، 450 گرم مخلوط کنسانتره و 40 گرم نمک برای هر 100 کیلوگرم وزن بدن، در اختیار تمامی حیوانات قرار گرفت. تیمار کاه برنج با 3 درصد اوره و 2 درصد خاک میدن منجر به یک افزایش در محتوای پروتیین خام جیره از 3/3 به 08/7 درصد شد. این مقدار به ترتیب به 4/7، 9/7 و 14/8 درصد در تیمارهای B،C  و D افزایش یافت. کل افزایش وزن در پایان آزمایش (روز 105) 39، 5/42،5/46 و 49 کیلوگرم به ترتیب برای گروه­های A، B،C  و D بود. افزودن کاه برنج تیمار شده با 5 درصد خاک میدن به­عنوان منبع اوره­آز + 3 درصد اوره به­ طور معنی ­داری ضریب قابلیت هضم ماده خشک، پروتیین خام، عصاره اتری و عصاره عاری از ازت را در مقایسه با سایر تیمارها افزایش داد. ماده آلی، پروتییین خام، الیاف خام، عصاره عاری از ازت قابل هضم و مجموع مواد مغذی قابل هضم به ­طور معنی ­داری در تیمار D بیشتر از سایر تیمارها بود. سود کلی تولید گوشت در تیمار D به ­طور معنی ­داری بالاتر از سایر گروه­ها بود.

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