1دانشجوی دکتری،گروه علوم دامی پردیس کشاورزی و منابع طبیعی دانشگاه رازی کرمانشاه
2استاد،دانشگاه رازی کرمانشاه - دانشکده کشاورزی - گروه علوم دامی
چکیده
این مطالعه برای ارزیابی اثرات عملآوری دانه جو بلغورشده با اسیدلاکتیک در جیره آغازین بر خوراک مصرفی، افزایش وزن روزانه، بازدهی خوراک مصرفی، قابلیت هضم مواد مغذی، رشد اسکلتی، و فراسنجههای خونی گوسالههای نر شیرخوار نژاد هلشتاین انجام شد. به همین منظور، 30 رأس گوساله نر با میانگین وزنی 2/25±45/06 به‌صورت تصادفی به سه گروه آزمایشی (هر گروه 10 رأس) اختصاص یافت. خوراک آغازین از چهار روزگی تا 65 روزگی پس از تولد حاوی 41 درصد بلغور دانه جو عملآوریشده بود. تیمارهای آزمایشی شامل 1- خوراک حاوی جو عملآوریشده در آب، 2- خوراک حاوی جو عملآوریشده در محلول نیم درصد اسید لاکتیک و 3- خوراک حاوی جو عملآوریشده با محلول یک درصد اسید لاکتیک بودند. خوراک مصرفی به‌صورت روزانه اندازهگیری شد. وزن بدن و شاخصههای رشد اسکلتی در چهار روزگی، 35 روزگی و 65 روزگی اندازهگیری و ثبت شد. در چهار روزگی، 35 روزگی و 65 روزگی از گوسالهها خونگیری شد. قابلیت هضم ماده خشک در کل دستگاه گوارش و بازدهی خوراک مصرفی در گوسالههایی که خوراک حاوی دانه جو عملآوریشده با اسید لاکتیک دریافت کردند از تیمارهای دیگر بیش‌تر بود (5 0/0≥P). عملآوری جو با اسیدلاکتیک اثری بر ماده خشک مصرفی، میانگین افزایش وزن روزانه، و فراسنجههای خونی نداشت. در 35 روزگی ارتفاع از جدوگاه و طول بدن در گوسالههایی که جو عملآوریشده با اسید لاکتیک دریافت کردند بالاتر بود (5 0/0≥P). به‌نظر میرسد که عملآوری دانه جو با اسید لاکتیک منجر به کاهش تجزیه نشاسته جو در شکمبه و افزایش عبور آن به روده باریک گردیده است و بر همین اساس بازدهی خوراک مصرفی بهبود یافته است. ممکن است استفاده از سطوح بالاتر اسید لاکتیک تأثیر مثبتی بر عملکرد گوسالهها داشته باشد.
Effects of treating barley grain with lactic acid on growth performance and blood parameters of male Holstein pre-weaned calves
نویسندگان [English]
vahid piri1؛ farokh kafilzadeh2
1deparment of animal science, campus of agriculture and natural resources, razi university of kermanshah, kermanshah, iran
2department of animal science- faculty of agriculture-razi university of kermanshah
چکیده [English]
This study was conducted to evaluate the effects of treating ground barley grain with lactic acid (LA) in starter diets on feed intake, average daily gain, feed efficiency, nutrient digestibility, skeletal growth, and blood metabolites of pre-weaneddairy calves. Thirty male Holstein calves with average initial body weight of 45.06±2.25 were randomly allocated to one of the 3 treatments. Starter containing 41% ground barley grain from day 4 to 65 of birth. Experimental treatments include: 1) diet containing treated barley in tap water (No LA), 2) diet containing treated barley in 0.5% LA solution, and 3) diet containing treated barley with 1% LA solution. Feed intake was recorded daily. Body weight and skeletal growth measures were recorded on day 4, day 35, and day 56. Calves blood samples were collected on day 4, 35, and 65. Total tract dry matter digestibility and feed efficiency were greater in calves fed diet containing lactic acid treated barley (p < /em> ≤0.05). No effects on dry matter intake, average daily gain, and blood metabolites was observed. At day 35 of the experiment the withers height and body length were greater in calves received LA-treated barely (p < /em> ≤0.05). It seems that treating barley grain with lactic acid decreased starch digestion in the rumen and increased starch flow to the small intestine; accordingly, feed efficiency was improved. Using higher levels of lactic acid may have a positive effect on calf performance.
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