تأثیر موننسین و متافیکس بر قابلیت هضم ظاهری موادمغذی، تولید و ترکیب شیر و الگوی اسیدهای چرب شیر گاوهای شیرده هلشتاین

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه لرستان

2 دانشیار، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه لرستان

3 استادیار، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه لرستان

4 دانشیار گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه لرستان

چکیده

به منظور بررسی تأثیر مکمل جیره‌ای موننسین با متافیکس یا بدون متافیکس (ترکیبی از اسیدهای دی کربوکسیلیک آلی مالات و فومارات) بر قابلیت هضم مواد مغذی، تولید و ترکیب شیر و الگوی اسیدهای چرب شیر، از 4 رأس گاو شیرده هلشتاین چند شکم‌زا با میانگین وزنی 12 ± 657 کیلوگرم و روزهای شیردهی  133 ± 41روز در قالب یک طرح مربع لاتین 4×4 استفاده شد. گاوها به‌طور تصادفی به تیمارهای آزمایشی اختصاص داده شدند. تیمارهای آزمایشی شامل جیرۀ پایه بدون افزودنی (به‌عنوان شاهد)، جیرۀ پایه به علاوه 24 میلی‌گرم موننسین در هرکیلوگرم مادۀ خشک، جیرۀ پایه به علاوه 5 گرم متافیکس در هرکیلوگرم مادۀ خشک و جیرۀ پایه به علاوه 24 میلی‌گرم در کیلوگرم موننسین و 5 گرم در کیلوگرم مادۀ خشک متافیکس بودند. افزودن موننسین با متافیکس یا بدون متافیکس به‌طور معناداری مادۀ خشک مصرفی را کاهش و تولید و بازده شیر را افزایش داد (05/0 > P). میانگین درصد چربی، پروتئین، لاکتوز، مواد جامد بدون چربی و کل مواد جامد تحت تأثیر جیره‌های آزمایشی قرار نگرفت. افزودن مکمل موننسین به‌تنهایی یا همراه با متافیکس قابلیت هضم ظاهری پروتئین خام، الیاف نامحلول در شویندۀ خنثی، کربوهیدرات‌های غیرالیافی و مادۀ آلی را به‌طور معناداری کاهش داد (05/0 > P). افزودن موننسین به تنهایی یا همراه با مکمل متافیکس به جیرۀ گاوهای شیری محتوی اسید لینولئیک کونژوگه (سیس-9، ترانس-11( شیر را به طور معنا‌داری افزایش داد (05/0>P). نتایج این تحقیق نشان داد که افزودن مکمل موننسین و متافیکس به جیره‌های گاوهای شیرده در اواسط دورۀ شیردهی باعث افزایش تولید شیر شد ولی تأثیر معنا‌داری بر ترکیبات شیر نداشت. افزودن مکمل موننسین و متافیکس به‌تنهایی یا به صورت مخلوط تأثیری بر ترکیب بیشتر اسیدهای چرب شیر نداشت، ولی محتوی اسید لینولئیک کونژوگه (سیس-9، ترانس-11( چربی شیر در نتیجۀ افزودن موننسین افزایش یافت.

کلیدواژه‌ها

عنوان مقاله [English]

Effects of monensin supplementation alone or in combination with Methafix on nutrient digestibility, milk production and composition of milking Holstein cows

نویسندگان [English]

  • Ahmad Ghasemi 1
  • Arash Azarfar 2
  • Ali Kiani 3
  • Heshmatollah Khosravinia 4
1 M.Sc. Student, Department of Animal Science, Faculty of Agriculture, Lorestan University, Khoram Abad, Iran
2 Associate Professor, Department of Animal Science, Faculty of Agriculture, Lorestan University, Khoram Abad, Iran
3 Assistant Professor , Department of Animal Science, Faculty of Agriculture, Lorestan University, Khoram Abad, Iran
4 Associate Professor, Department of Animal Science, Faculty of Agriculture, Lorestan University, Khoram Abad, Iran
چکیده [English]

This study was conducted to evaluate the effect of supplementing diets of milking cows monensin supplementation alone or in combination with Methafix (a commercial product containing malate and fumarate) on nutrient digestibility, milk production and composition and milk fatty acids profile. Using four multiparous Holstein milking cows (657± 12 kg of live weight; 133 ± 41days in milk) in a Latin square design. The cows were randomly assigned to one of the four dietary treatments. The first treatments was the control diet(C), second was control diet supplemented with 24 mg of monensin/kg of DM (M), the third was control diet supplemented with 5 g of Methafix/kg DM (ME) and the fourth treatment was C diet supplemented with 24 mg of monensin in combination with 5 g of Methafix/kg DM (MM). Dietary supplementation with Monensin alone or in combination with Metafix significantly decreased dry matter intake (P<0.05), while the intake of crude protein (CP), neutral detergent fiber (NDF) and non-fiber carbohydrates (NFC) were not affected. The digestibility of organic matter (OM) and CP were significantly lower in M and MM-fed cows than the other cow (P<0.05). Total tract apparent digestibility of NDF and NFC were lowest in the cows fed with MM diet. Dietary treatments had no effect on fat and energy corrected milk production, milk fat, protein and lactose concentrations, utilization efficiency of N and NEL (P>0.05). Utilization efficiency of dry matter for milk production was higher in monensin and Methafix-supplemented cows than in control cows (P<0.05).  Supplementing milking cow rations with monensin alone or in combination with Methafix significantly (P<0.05) increased milk fat concentration of conjugated linoleic acid (cis9, trans11). In conclusion, the results of this study showed that supplementing mid-lactating cows with monensin or Methafix would increase milk yield, but had no effect on milk components. Dietary supplementation of milking cows with monensin and Methafix alone or together had no effect on majority of milk fatty acids, but elevated milk concentration of conjugated linoleic acid (cis-9, trans 11).    

کلیدواژه‌ها [English]

  • methafix
  • Milk production
  • milk fatty acids profile
  • monensin

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  • تاریخ دریافت: 24 دی 1393
  • تاریخ بازنگری: 28 آبان 1394
  • تاریخ پذیرش: 30 آبان 1394

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