نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادگروه علوم دامی دانشکده کشاورزی و منابع طبیعی دانشگاه محقق اردبیلی، اردبیل ، ایران
2 فارغ التحصیل کارشناسی ارشد گروه آموزشی علوم دامی، دانشکده کشاورزی و منابع طبیعی دانشگاه محقق اردبیلی، اردبیل ، ایران
3 استاد گروه علوم دامی دانشکده کشاورزی و منابع طبیعی دانشگاه محقق اردبیلی، اردبیل ، ایران
4 دانشجوی دکتری گروه آموزشی علوم دامی، دانشکده کشاورزی و منابع طبیعی ، دانشگاه محقق اردبیلی، اردبیل
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Introduction
Population growth and competition with humans for grain have increased the price of animal feed, leading to a search for cheaper feed ingredients for animal diets. Additionally, the primary objective of animal husbandry is to achieve high production with a low cost to maximize net income; however, rising feed prices have impacted the economic situation of livestock breeders. Since the share of animal protein in the human protein supply should be at least 25%, it is necessary to increase milk and meat production by 30% over the next two decades. Therefore, it is necessary to devise measures that utilize waste and materials that cannot be used in human nutrition due to their high lignocellulosic content in animal nutrition. the plants by-products, such as its hull and meal, can be used in animal feed. Sesame hulls are left as waste and residue from oil mills and related industries, posing problems for livestock farmers, regional residents, and the environment. However, they can be used as a substitute for barley and other dietary components in animal nutrition. In addition, sesame hulls have high antioxidant and fiber content, and they can also meet parts of animal needs. However, studies conducted in this regard are few.
Method
24 male Moghani lambs with an average weight of 30±2 were used in four treatments and 6 replications in a completely randomized design. The experimental treatments included: (1) control, (2) treatment receiving 10% sesame hull, (3) treatment receiving 20% sesame hull, and (4) treatment receiving 30% sesame hull. Feed intake, weight gain, and several blood parameters, including glucose, cholesterol, triglycerides, and total protein, were measured. After slaughter, cold and warm carcass weights were also calculated. The data obtained were analyzed using SAS software.
Results
The results of the effect of sesame husk consumption on dry matter intake and daily weight gain, period weight gain, and feed conversion ratio (days 45 and 80 of the rearing period) in Moghani fattening lambs are shown in Table 3. According to these results, although the third treatment (receiving a diet containing 20% sesame husk) numerically showed the highest dry matter intake, in general, no significant effect of the experimental treatments on dry matter intake was observed across the first, second, and entire rearing periods. The experimental treatments also had no significant effect on the feed conversion ratio. In the present study, different levels of sesame husk significantly changed the apparent digestibility of dry matter in Moghani fattening lambs. The results of the present study showed that the treatments in the first period had a significant effect on glucose levels. In contrast, they had no significant effect on cholesterol, triglycerides, or protein. The results of the experimental treatments on the weight of hot and cold carcasses in Moghani fattening lambs showed that the treatments had no significant effect on them. However, numerically, the highest weight of hot and cold carcasses was observed in the group receiving the control diet. In addition, except for leg weight, the experimental treatments had no significant effect on the weight of the carcass parts. The highest leg weight was observed in the treatment receiving 20% sesame husks, and the lowest in the control treatment and the treatment receiving 30% sesame husks. The results of the effect of sesame husk consumption on the cost of feed in fattening lambs demonstrated that the lowest price of feed per kilogram of live weight gain, according to the feed conversion ratio of the animal, was observed in the treatment receiving 10% sesame husks. however, feed costs were 18.13% and 11.63% higher in the treatment receiving 20% and 30% sesame husks than the control group, respectively. The results showed that the treatment receiving 30% sesame husks had more feed cost.
Conclusions
In general, the results of the present study showed that the use of sesame hulls in fattening lambs' feed is acceptable without adversely affecting performance or digestibility. It was also demonstrated that sesame hull can be used as a substitute for barley at levels of 20% and 30%. In this way, in addition to being included in the livestock diet as a food source, it also prevents environmental pollution.
کلیدواژهها [English]
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