اثرات اندازه ذرات علوفه یونجه و سیلاژ ذرت بر مصرف خوراک، فراسنجه های هضم شکمبه ای و فعالیت جویدن در میش‌های آبستن سنگسری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 رئیس مرکز آموزش جهاد کشاورزی دامغان

2 استاد

3 دانشگاه علوم کشاورزی و منابع طبیعی ساری، تخصص: تغذیه نشخوارکنندگان

4 دانشگاه زنجان، تخصص: تغذیه دام

5 هیات علمی موسسه تحقیقات علوم دامی کشور

چکیده

در این تحقیق اثر اندازه ذرات علوفه یونجه و سیلاژ ذرت بر فعالیت جویدن، نرخ عبور مواد جامد از شکمبه و عملکرد میش‌های آبستن با استفاده از 30 رأس میش (سن 4/0 ± 35 ماه) در قالب طرح کاملاً تصادفی با پنج تیمار و شش تکرار به مدت 30 روز مطالعه شد. جیره‌های آزمایشی شامل یونجه (سه اندازه، با میانگین هندسی 42/2، 91/4 و 04/7 میلی‌متر) و سیلاژ ذرت (دو اندازه، با میانگین هندسی 36/3 و 73/7 میلی‌متر) بودند. تیمارهای دارای ذرات ریز یونجه و سیلاژ ذرت دارای کم‌ترین عامل مؤثر فیزیکی (pef>8) بودند و مقادیر عامل مؤثر فیزیکی (pef>8 و pef>1.18) با کاهش اندازه ذرات کاهش یافتند (05/0 pP). زمان مصرف خوراک، فعالیت نشخوار و زمان کل جویدن تحت تأثیر تیمار قرار نگرفتند. بر اساس نتایج حاصل، ایجاد تعادل مناسب بین اندازه ذرات علوفه به‌عنوان نماینده‌ای از بخش فیزیکی و ویژگی‌های شیمیایی جیره لازم است موردتوجه قرار گیرد. تیمار دارای علوفه یونجه ریز به علاوه سیلاژ ذرات بلند در اکثر موارد مورد ارزیابی نتایج بهتری را نشان داد و به نظر می‌رسد این تیمار تعادل مناسب‌تری در جیره برای تغذیه میش‌ها فراهم کرده است. بنابراین در تهیه جیره میش‌های آبستن با در نظر گرفتن اندازه ذرات می‌توان عملکرد بهتری را انتظار داشت.

کلیدواژه‌ها


عنوان مقاله [English]

Effects of alfalfa and corn silage particle size on feed intake, rumen digestion parameters and chewing activity in pregnant Sangsari ewes

نویسندگان [English]

  • gholamhosein Irajian 1
  • hamid Amanlou 2
  • Asadollah Teimouri Yansari 3
  • hamid reza mirzaie almouti 4
  • hormoz mansouri 5
1 markaz amuzesh jahad- keshavarzi damghan
2 Professor
3 Sari Agricltural and Natural Resources university (SANRU)
4 DR
5 dr
چکیده [English]

This study investigated the effects of alfalfa hay and corn silage particle size on chewing activity, passage rate of solid fraction in the rumen and performance of pregnant ewes. The experiment has been done using 30 ewes (35±0.4 months) in a completely randomized design with five treatments and six replicates during a 30 days period. Forages were including alfalfa hay (three sizes, geometric mean 2.42, 4.91 and 7.04 mm) and corn silage (two sizes, geometric mean 3.36 and 7.73 mm). Treatments including fine particles of alfalfa hay and corn silage had the least physical effectiveness factor (pef > 8) and pef values (pef >8, pef >1.18) were reduced with decrease in particle size (p<0.05). Geometric mean also decreased (p<0.05). Following reduction in particle size of forages, passage rate of solid fraction in the rumen and terminal part of digestive tract (TDT) were increased (p<0.05) and retention time in the rumen, TDT and total retention time were decreased (p<0.05). Feed intake time, chewing activity and total chewing time were not affected (p<0.05). Results showed that it is necessary to consider the appropriate balance between particle size as a representative of the physical and chemical characteristics of the diet. The treatment of alfalfa fine particle size plus corn silage long particle size in most cases showed better results, and it seems that this treatment has provided a more appropriate balance in the diet for feeding ewes. Therefore, in preparing the pregnant ewes’ diet, we can expect better performance by considering the particle size.                                            

کلیدواژه‌ها [English]

  • forage type
  • particles geometric mean
  • physically effective fiber
  • retention time
  • ruminal mat
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