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بررسی پاسخ رشد و کارآیی مصرف خوراک در گوساله‌های از شیرگرفته شده هلشتاین بعد از مصرف مکمل متیونین پوشش‌دار | ||
| علوم دامی | ||
| دوره 36، شماره 141، اسفند 1402، صفحه 45-58 اصل مقاله (1.7 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/asj.2023.360455.2267 | ||
| نویسندگان | ||
| حامد نیکوکلام میرزایی1؛ فرهاد فرودی* 2؛ ناصر کریمی2؛ قباد عسگری2؛ کاظم کریمی2 | ||
| 1دانشجوی دکتری تخصصی، گروه علوم دامی، دانشگاه آزاد اسلامی واحد پیشوا ، ورامین، ایران. | ||
| 2عضو هیات علمی گروه علوم دامی، دانشگاه آزاد اسلامی واحد پیشوا، ورامین، ایران. | ||
| چکیده | ||
| تأثیر مصرف متیونین پوشش‌دار بر عملکرد رشد، اندازه ابعاد بدن و بازده مصرف خوراک در زمان‌های مختلف بعد شیرگیری با استفاده از 40 رأس گوساله هلشتاین در 4 گروه آزمایشی در قالب طرح آماری کاملاَ تصادفی با مشاهدات تکراری بررسی شد. گروه‌های آزمایشی شامل: 1) گوساله‌های شاهد که در سن 75 روزگی از شیر گرفته شدند، 2) گوساله‌هایی که تا 10 روز بعداز شیرگیری متیونین پوشش‌دار دریافت کردند، 3) گوساله‌هایی که تا 20 روز بعد از شیرگیری متیونین پوشش‌دار دریافت کردند، و 4) گوساله‌هایی که تا 30 روز بعد از شیرگیری متیونین پوشش‌دار دریافت کردند. مکمل مصرفی گوساله‌ها از نوع متیونین پوشش‌دار ساخت شرکت Adisseo و به میزان 2 گرم/روز/رأس همراه جیره استفاده شد. صفات اندازه‌گیری شده شامل رشد ( میزان وزن و افزایش وزن روزانه)، ابعاد بدن (اندازه طول بدن و اندازه قد یا ارتفاع بدن) و محاسبه بازده مصرف خوراک در مقاطع یاد شده بودند. نتایج نشان داد میانگین مصرف خوراک، پروتئین و انرژی تیمارهای سوم و چهارم در سنین 85 ، 95 و 105روزگی به ترتیب 79/9، 12/10 و 27/10 درصد بیشتر از میانگین تیمارهای اول و دوم بود (05/0P<). افزایش وزن روزانه و بازده خوراک مصرفی این تیمارها در همان مقاطع نیز به ترتیب 92/15 و 63/4 درصد بیشتر بود (05/0P<). تیمارهای مصرف کننده مکمل متیونین میانگین وزن بیشتر (16/4%) و میانگین افزایش قد بیشتری (15/8%) نسبت به شاهد داشتند (05/0P<). در کل این مکمل اثر مثبت بر میزان رشد، اندازه قد و بازده مصرف خوراک گوساله ها داشت و قابل توصیه است. | ||
| کلیدواژه‌ها | ||
| اندازه بدن؛ افزایش وزن؛ بازده مصرف خوراک؛ گوساله هلشتاین | ||
| عنوان مقاله [English] | ||
| Effect of supplementing rumen protected methionine on growth traits and feed efficiency of weaned Holstein calves | ||
| نویسندگان [English] | ||
| Hamed Nikookalam1؛ Farhad Foroudi2؛ Naser Karimi2؛ Ghobad Asgari2؛ Kazem Karimi2 | ||
| 1PhD candidate, Animal Science Department, Islamic Azad University, Varamin-Pishva branch, Varamin, Iran. | ||
| 2Depart,ment of Animal Science, Islamic Azad University Varamin-Pishva branch, Varamin, Iran. | ||
| چکیده [English] | ||
| A study was performed to investigate the effect of rumen protected methionine (RPM) on growth traits and feed efficiency of weaned Holstein calves using 40 calves in 4 experimental groups in a CRD plan with repeated measures were done. The experimental groups were included: 1) control (not given RPM after weaning at 75 days) 2) group was given RPM until 10 days 3) group that was given RPM until 20 days 4) group that was given RPM until 30 days after weaning. RPM was used in the amount of 2 g/d/calf. The studied traits included weight and average daily gain, body length and height, and calculated feed efficiency of experimental period. The results showed that the average feed and nutrient intake (protein and energy) of the third and fourth treatments at the ages of 85, 95 and 105 days were 9.79, 10.12 and 10.27% higher than the average of the first and second treatments (P<0.05). Daily weight gain and feed efficiency of these treatments were also 15.92% and 4.63% respectively (P<0.05).Treatments using methionine supplements had a higher average weight (4.16%) and a higher average height increase (8.15%) than the control (P<0.05). In conclusion, the use of coated methionine supplement in the ration of calves after weaning had a positive effect on growth performance, height measure and overall feed efficiency and it can be recommended at the mentioned level to the farmers. Key words: Body measures, Gain, Feed efficiency, Holstein calves. | ||
| کلیدواژه‌ها [English] | ||
| Body measures, Gain, Feed efficiency, Holstein calves, Rumen Protected-Met | ||
| مراجع | ||
4- خوروش، م.، ح. یزدانی.، ا، کوثر.، ر، کوثر. و غ، قربانی. (1391). بررسی اثر تغذیه دو منبع متیونین محافظت شده در سطح مزرعه‌ای در اوایل دوره شیردهی بر عملکرد تولیدی و تولید مثلی گاوهای شیرده هلشتاین. نشریه پژوهشهای علوم دامی ایران، جلد 4، شماره 2. ص ص 67-57.
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