اثر انواع نمک‌های کلسیمی اسیدهای چرب بر عملکرد و الگوی اسیدهای چرب شیر گاوهای هلشتاین

پژوهشهای علوم دامی ایران

مقاله 2، دوره 13، شماره 2 - شماره پیاپی 46، تیر 1400، صفحه 175-192   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/ijasr.v13i2.87392

نویسندگان

جواد نصیری¹؛ حسن علی عربی^{* 2}؛ پویا زمانی²

¹گروه علوم دامی، دانشکده کشاورزی، دانشگاه بوعلی سینا همدان، ایران.

²گروه علوم دامی، دانشکده کشاورزی، دانشگاه بوعلی سینا همدان، ایران

چکیده

این مطالعه به‌منظور بررسی اثر انواع نمک­های کلسیمی اسیدهای چرب بر عملکرد و الگوی اسید­های چرب شیر انجام شد. در این مطالعه از 21 رأس گاو هلشتاین با روزهای شیردهی 5/8 ± 30 استفاده شد. گاوها به سه گروه مساوی تقسیم و جیره­های زیر را دریافت کردند: 1. جیره شاهد 2. جیره حاوی منبع چربی A (ساخته شده در آزمایشگاه)3. جیره حاوی منبع چربی B (مرسوم در بازار). گاوها در سه نوبت دوشیده شدند. رکورد و مصرف خوراک به‌صورت روزانه ثبت شدند و نمونه­گیری از شیر، خوراک و مدفوع جهت تعیین ترکیب به‌صورت هفتگی انجام گرفت. خون‌گیری از دام­ها به عمل آمد. در پایان دوره آزمایش نمونه­ شیر جهت تعیین الگوی اسید چرب جمع­آوری شد. مصرف ماده خشک در جیره شاهد 5 درصد بیشتر از دو جیره دیگر بود در حالیکه میزان تولید شیر در جیره حاوی مکمل چربی A افزایش معنی­داری نسبت به جیره شاهد داشت و با جیره حاوی مکمل چربی B تفاوتی نداشت. BCS و تغییرات وزن بدن تحت تاثیر جیره­ها قرار نگرفت. مکمل چربی A بر قابلیت هضم فیبر جیره تاثیر منفی نداشت و مشابه جیره شاهد و مکمل چربی B بود. میزان C18:2 شیر گاوهای دریافت کننده جیره حاوی مکمل A نسبت به مکمل B و جیره شاهد به ترتیب 21 و 47 درصد افزایش داشت. درصد چربی و C14:0 شیر در جیره شاهد نسبت به دو جیره دیگر افزایش معنی­دار پیدا کرد. مکمل چربی A می­تواند به عنوان منبع چربی در اوایل دوره شیردهی استفاده شود و نتایج مشابهی با نمونه تجاری مرسوم داشت.

کلیدواژه‌ها

ترکیب شیر؛ تولید شیر؛ گاو شیری؛ نمک کلسیمی اسید چرب

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