Effect of Forage Feeding Level on Performance, Meat Quality and Economic Costof Holstein Beef Calves Fed Organic Diet

محورهای موضوعی : Camel

م. شریفی ¹ (Department of Animal Science, University of Tabriz, Tabriz, Iran)
ر. پهلوان ² (National Animal Breeding Center and Promotion of Animal Product, Karaj, Iran)
ع.ا. خادم ³ (Department of Animal and PoultryScience, College of Abouraihan, University of Tehran, Tehran, Iran)
ب. هینس ⁴ (Department of Animal Science, University of Minnesota, St. Paul 55108, USA)
م. صوفی زاده ⁵ (Department of Animal Science, University of Urmia, Urmia, Iran)

تاریخ دریافت : 1393/03/04 تاریخ پذیرش : 1393/08/24 تاریخ انتشار : 1394/03/11

کلید واژه: beef calves, meat quality, organic diet,

چکیده مقاله :

The aim of this study was to compare conventional and organic diets in beef production. Thirty-two dairy beef calves were used in 4 treatments: organic diet with three levels of forage [70% of organic diet with high amount of forage (ORH), 55% of organic diet with medium amount of forage (ORM), 38% of organic diet with low amount of forage(ORL)] and conventional diet (CON). The dry matter intake (DMI), average daily gain (ADG) and feed conversion rate (FCR) of calves were measured. The calves were then slaughtered at the end of the study. DMI was significantly differed among groups after the 5th period. However, FCR and ADG were significantly differed among the treatments in several periods. Carcass physical size, lipid and cholesterol were lower in organic diets compared to the CON. Significant increases were observed in organic meat for C18:2, C18:3 fatty acids, heminic iron, α-tocopherol and ß-carotene. The results of the study showed that calves fedorganic diet with high amount of forage had significantly lower FCR compared to the other diets.

چکیده انگلیسی:

هدف از این مطالعه مقایسه جیره غذایی معمولی و ارگانیک در تولید گوشت گاو بود. 32 گوساله نر شیری در 4 تیمار به کار گرفته شده بود که شامل: جیره ارگانیک با سه سطح از علوفه {70 درصد جیره غذایی ارگانیک با میزان بالایی از علوفه (ORH)، 55 درصد جیره غذایی ارگانیک با مقدار ​​علوفه متوسط (ORH)، 38 درصد جیره غذایی ارگانیک با مقدار علوفه کم (ORH)} و جیره غذایی رایج (CON). مصرف ماده خشک (DMI)، متوسط ​​وزن روزانه (ADG) و نرخ تبدیل غذایی (FCR) گوساله اندازه‌گیری شد. گوساله‌ها پس از پایان مطالعه کشتار شدند. DMI به طور قابل توجهی در میان گروه‌های بعد از دوره 5 متفاوت بودند. با این حال،FCR  و ADG به طور قابل توجهی در میان تمامی دوره‌ها تفاوت داشت. اندازه فیزیکی لاشه، چربی و کلسترول در جیره غذایی رایج نسبت به رایج کمتر بودند. افزایش معنی داری در گوشت ارگانیک برای C18:2، C18:3 اسید چرب، آهن هیمینیک، آلفا توکوفرول و بتا کاروتن مشاهده شد. نتایج حاصل از این مطالعه نشان داد که گوساله تغذیه شده در جیره غذایی ارگانیک با میزان بالایی از علوفه نسبت به جیره‌های غذایی دیگر به طور قابل توجهی FCR پایین‌تری داشته است.

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