اثر افزودن پودر خشک سیر (Allium sativum) و شوید (Anethum graveolens) به جیره بر عملکرد رشد، ویژگی‌های لاشه، جمعیت میکروبی روده و فراسنجه‌های خون جوجه‌های گوشتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی،، دانشگاه گنبد کاووس، گنبد کاووس، ایران

2 دانش آموخته کارشناسی ارشد تغذیه دام و طیور، دانشگاه گنبد کاووس، دانشگاه گنبد کاووس، گنبد کاووس، ایران

3 استادیار گروه علوم دامی، دانشگاه گنبد کاووس،دانشگاه گنبد کاووس، گنبد کاووس، ایران

چکیده

هدف: این پژوهش با هدف بررسی اثر افزودن پودر سیر و شوید به جیره‌ بر عملکرد، ویژگی‌های لاشه، فراسنجه‌های خون، جمعیت میکروبی روده و بازده اقتصادی تولید جوجه‌های گوشتی انجام شد.
روش پژوهش: تعداد 176 قطعه جوجه گوشتی کاب (نر و ماده) در قالب طرح کاملاً تصادفی در چهار تیمار با چهار تکرار تقسیم و به مدت 42 روز پرورش یافتند. تیمارهای آزمایشی از روز یکم تا 42 روزگی به جوجه‌ها ارائه گردید. تیمارها شامل 1(جیره پایه، 2) جیره پایه+ 5/0 درصد پودر سیر، 3) جیره پایه+ 3 درصد پودر شوید و 4 جیره پایه+ 5/0 درصد پودر سیر+3 درصد پودر شوید بود. میزان خوراک مصرفی و وزن بدن پرندگان به طور هفتگی اندازه‌گیری شد. در پایان دوره، از هر تیمار هشت پرنده کشتار شدند تا برای تجزیه لاشه، تهیه نمونه بافت ایلئوم و خون‌گیری استفاده شود.
یافته‌ها: نتایج نشان داد که اثر تیمارهای آزمایشی بر افزایش وزن و ضریب تبدیل غذایی جوجه‌ها در کل دوره پرورش معنی‎دار بود و جوجه‌هایی که با پودر سیر تغذیه شدند افزایش وزن زنده بیشتر و ضریب تبدیل غذایی کمتری نسبت به سایر تیمارها داشتند. خوراک مصرفی جوجه‌ها تحت تاثیر تیمارهای آزمایشی نبود. اثر تیمارهای آزمایشی بر بازده لاشه، وزن سینه و ران جوجه‌ها معنی‌دار نبود، ولی جوجه‌هایی که پودر سیر مصرف کردند به طور معنی‌دار چربی حفره شکمی کمتری داشتند. تیمارهای آزمایشی بر غلظت تری‌گلیسریدها و کلسترول خون جوجه‌ها تاثیر معنی‌دار داشت، به طوری که سطح آن‌ها در خون جوجه‌هایی که پودر سیر و پودر شوید و مخلوط آن‌ها را مصرف کردند از گروه شاهد کمتر بود. جمعیت میکروبی دیواره ایلئوم جوجه‌ها به طور معنی‌دار تحت تأثیر تیمارهای آزمایشی قرار گرفت. استفاده از پودر سیر و شوید به تنهایی و ترکیب آن‌ها باهم باعث کاهش معنی‌دار جمعیت کل باکتری‌ها و افزایش جمعیت لاکتوباسیل‌ها نسبت به گروه شاهد شد. افزودن پودر سیر به تنهایی جیره باعث افزایش معنی‌دار شاخص تولید و بازده ناخالص اقتصادی در کل دوره پرورش جوجه‌ها شد.
نتیجه‌گیری: می‌توان نتیجه گرفت که افزودن 5/0 درصد پودر سیر در جیره باعث بهبود رشد، کاهش چربی شکمی، بهبود فلور میکروبی روده و افزایش بازده اقتصادی تولید جوجه‌های گوشتی می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Adding Dried Garlic (Allium sativum) and Dill (Anethum graveolens) Powders to Diet on Growth Performance, Carcass Traits and Intestinal Microbial Population and Blood Parameters of Broiler Chickens

نویسندگان [English]

  • Farid Moslemipur 1
  • Saeed Khorramaki 2
  • Shahriar Maghsoudlou 3
  • Fariba Farivar 3
1 Associate Professor of Department of Animal Science, Faculty of Agriculture and Natural Resources,Gonbad Kavous University, Gonbad Kavous, Iran
2 MSc in Animal nutrition, Gonbad Kavous University,Gonbad Kavous University, Gonbad Kavous, Iran
3 Assistant professor, Dept. of Animal Sciences, Gonbad Kavous University,Gonbad Kavous University, Gonbad Kavous, Iran
چکیده [English]

Introduction
Growing concerns arose about feed additive residues in broiler carcasses, especially antibiotics. On the other hand, producing carcasses with lower fat content is considered beneficial for the consumers. Nowadays, medicinal plants are the first-choice candidates as growth promoters, with antimicrobial and hypolipidemic properties, to be added to broiler feed. Garlic has a prestigious place in traditional medicine, with new insights into its beneficial effects in animal production. Dill is also famed for its anti-lipid properties. Iran is home to various medicinal plants that are produced at low cost, providing a good opportunity to use them in broiler chicken production. Therefore, the goal of the study was to investigate the effects of adding dried garlic and dill powders to the diet on growth performance, carcass characteristics, blood biochemicals, intestinal microbial populations, and economic production efficiency in broiler chickens.
Method
A total of 176 one-day-old Cobb-500 chickens (male and female) were randomly assigned to 4 treatment groups, with 4 replicates per group, and reared for 42 days. Treatments were 1) basic diet; a corn-soybean based meal, 2) basic diet+ 0.5% garlic powder, 3) basic diet+ 3% dill powder, and 4) basic diet+ 0.5% garlic powder+ 3% dill powder that were arranged as a completely randomized design and fed to chicken from the first day to the end of the trial (day 42). Fresh, clean garlic cloves and green dill (including leaves and stems) were first thoroughly washed, air-dried, and then finely milled. The diets were formulated according to NRC recommendations for three periods: d 1-10 (starter diet), d 11-23 (grower diet), and d 24-42 (finisher diet). The vaccination schedule and lighting regimen were carried out according to Cobb500 recommendations. All birds were maintained in the same ambient conditions throughout the experiment. Feed intake and live weight of the chicken were measured weekly. The feed conversion ratio was calculated weekly. At day 42, 32 chickens (two birds per replicate) were slaughtered for carcass analysis and to collect blood and ileal samples. Breast, thighs, and abdominal fat pad weights were expressed as a percentage of the carcass weight. Blood metabolites, including total protein, cholesterol, and triglycerides, were assayed via spectrophotometry. For the microbiology trial, a 2cm sample from the middle of the chicken ileum was incised and homogenized for incubation to determine total microbes and lactobacilli counts of the ileal wall using MRS agar and nutrients agar, respectively. Production index and gross economic efficiency were calculated over the entire experimental period. Data were analyzed using a completely randomized design in SAS version 9.1 (2003), and mean comparisons were performed using the least significant difference (LSD) test.
Results
Results showed that the effect of the experimental treatments on liveweight gain and feed conversion ratio of chickens over the study period was significant, with chickens fed garlic powder alone in the diet having greater liveweight gain and a lower feed conversion ratio than other groups (p<0.05). Feed intake in chickens was not affected by the treatments, but it was significantly lower in birds fed diets containing dill powder than in other groups. The effect of treatments on carcass, breast, and thigh weights of chickens was not affected by the treatments, but the birds fed garlic powder alone in the diets showed a decrease in abdominal fat pad weight compared to other birds (p<0.05). Adding garlic and dill powders to the diet decreased blood cholesterol and triglyceride levels in chickens; chickens fed garlic and dill powders alone or in combination had lower cholesterol and triglyceride levels than those in the control group (p<0.05). No significant differences in blood total protein concentrations were found among groups. Ileal microbial populations of chickens were significantly affected by the experimental treatments, in which the utilization of garlic and dill powders alone or combined in the diets resulted in a marked decrease in total ileal wall microbial population and an obvious increase in ileal wall lactobacilli population (p<0.05). Adding garlic powder alone to the diets significantly increased economic indices of chicken production, including the production index and gross economic efficiency (p<0.05). It can be discussed that the improved feed conversion ratio in birds fed garlic powder is mainly due to the enhanced weight gain compared to other groups. As there is a relationship between blood lipid levels and carcass fat depots, garlic powder lowered the abdominal fat pad of chickens with an obvious decrease in their blood triglycerides and cholesterol levels. In addition, an increased intestinal lactobacilli population is the most beneficial bacteria in the gut, and a lowered total bacteria count from using garlic powder in the diet may indirectly indicate that the harmful bacteria population, such as E. coli, was concurrently restricted, which warrants further study. No synergistic effects were observed by adding garlic powder and dill powder to the chickens’ diet, except for a decremental effect on the blood cholesterol level. In contrast to the previous studied mentioning that garlic and dill derivatives can enhance appetite and feed intake in broilers, in the present study not only feed intake was not increased by the inclusion of garlic and dill in the diets but also feed intake tended to be decreased by using garlic and dill in the diets that may be referred to elevated diet fiber content and/or the route of garlic and dill inclusion.
Conclusions
There were no advantages to adding dill powder to the broiler diet, but, considering the economic efficiency of production, using 0.5% dried garlic powder in the broiler diet is recommended due to improved growth performance parameters, lower carcass fat content, and a beneficially modified intestinal microbial population. Furthermore, no deleterious effects were observed in chickens when garlic powder was added to the diet.

کلیدواژه‌ها [English]

  • Blood lipids
  • Broiler chicken
  • Dill
  • Garlic
  • Intestinal bacteria
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