نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار،بخش تحقیقات مدیریت پرورش دام و طیور، مؤسسه تحقیقات علوم دامی کشور

2 استادیار،سازمان تحقیقات، آموزش و ترویج کشاورزی، مؤسسه تحقیقات علوم دامی ایران، کرج

3 کارشناس،آزمایشگاه شیر، آزمایشگاه مرکزی، مؤسسه تحقیقات علوم دامی کشور

چکیده

اثر مصرف جیره­های حاوی منابع مختلف چربی بر تولید و ترکیب شیر و ریخت‌شناسی غده پستان 40 رأس بز سانن شکم اول از دو ماه آخر آبستنی تا 12 هفته پس از زایش، موردمطالعه قرار گرفت. بزها براساس میانگین وزن زنده اولیه به چهار گروه 10 رأسی تقسیم و به یکی از چهار جیره­ آزمایشی اختصاص یافتند. جیره­ها شامل جیره بدون چربی، جیره حاوی چربی اشباع، جیره حاوی دانه سویا و جیره حاوی دانه بزرک بودند. نتایج این مطالعه نشان داد در کل دوره، تولید شیر در بزهای تغذیه‌شده با جیره حاوی دانه بزرک بیش‌تر از بزهای تغذیه‌شده با جیره بدون چربی یا حاوی چربی اشباع بود (0/05>P). میانگین تولید شیر روزانه در بزهای تغذیه‌شده با جیره حاوی دانه بزرک در هفته­های اول، دوم، سوم، پنجم، دهم و دوازدهم شیردهی نسبت به بزهای تغذیه‌شده با جیره بدون چربی یا حاوی چربی اشباع بالاتر بود (0/05>P). درصد پروتئین، لاکتوز، مواد جامد بدون چربی و مواد جامد شیر در بزهای تغذیه‌شده با جیره بدون چربی بالاتر از سایر گروه­ها بود (0/05>P). درصد نسبت چربی به پروتئین در بزهای تغذیه‌شده با جیره حاوی چربی­های غیراشباع بالاتر از سایر گروه­ها بود (0/05>P). مصرف جیره حاوی چربی­های غیراشباع موجب بهبود در حجم، محیط و اندازه­ کارتیه­های پستان شد (0/05>P). در مجموع، استفاده از مکمل­های چربی غنی از اسیدهای چرب غیراشباع مانند دانه سویا یا دانه بزرک در جیره پیش از زایش و اوایل شیردهی، عملکرد شیردهی را در بزهای سانن شکم اول بهبود می­بخشد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of fat supplementation type on milk production, and composition and mammary gland morphological parameters in primiparous Sannen does

نویسندگان [English]

  • Hoda Javaheri Barfourooshi 1
  • Hasan Sadeghipanah 1
  • Nader Asadzadeh 1
  • nader papi 2
  • Fazlolah Mousavipoor 3

1 Department of Animal production management, Animal Science Research Institute

2 Agricultural Research Education and Extension Organization (AREEO), Animal Science Research Institute of Iran

3 Dairy lab, Central Laboratory, Animal Science Research Institute

چکیده [English]

The effect of diets containing different sources of fat on milk production and composition, and mammary gland morphology of the 40 primiparous Saanen does was studied during the last two months of pregnancy to 12 weeks after kidding. Goats were divided into four groups of 10 each, based on the average initial live weight and were assigned to one of four experimental diets. The diets included a non-fat diet, diet containing saturated fat, diet containing roasted soybeans, and a diet containing extruded flaxseed. The results showed that during the whole experimental period, milk production in goats fed with diet containing flaxseed was higher than in goats fed with non- fat diet or saturated fat diet (P<0.05). The average daily milk production of goats fed a diet containing flaxseed in the first, second, third, ninth, tenth, and twelfth weeks of lactation was higher than that of goats fed non-fat diet or saturated fat (P<0.05). The percentage of protein, lactose, solids not fat, and milk solids in non-fat diet goats were higher than the other groups (P<0.05). The percentage of fat to protein ratio in goats fed a diet containing unsaturated fat was higher than in other groups (P<0.05). Consumption of diets containing unsaturated fats improved the volume, environment, and size of mammary gland quarters (P<0.05). In general, the use of fat supplements rich in unsaturated fatty acids such as soybeans or flaxseed, in the close-up and early lactation diets could improve lactation performance in primiparous Sannen goats.

کلیدواژه‌ها [English]

  • Fat supplements
  • Lactation performance
  • Mammary gland morphology
  • pregnancy
  • Sannen goat
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