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اثر مصرف ملاتونین و بروموکریپتین بر تولید کرک و رشد طولی الیاف بزهای رائینی | ||
| علوم دامی | ||
| مقاله 6، دوره 30، شماره 116، آذر 1396، صفحه 69-78 اصل مقاله (932.84 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/asj.2017.113949 | ||
| نویسندگان | ||
| جواد رودباری1؛ مهناز صالحی2؛ اردشیر محیط3؛ هدی جواهری بارفروشی* 2 | ||
| 1دانش آموخته کارشناسی ارشد دانشگاه گیلان | ||
| 2عضو هیات علمی موسسه تحقیقات علوم دامی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران | ||
| 3عضو هیات علمی دانشکده کشاورزی، دانشگاه گیلان، رشت،ایران | ||
| چکیده | ||
| برای تعیین اثر ملاتونین و بروموکریپتین بر رشد طولی، قطر کرک و مو و تولید بیده، 24 راس بز ماده رائینی(دو و سه ساله با میانگین وزن بدن 4/1±0/35 کیلوگرم) انتخاب شدند. بزها در قالب یک طرح کاملا تصادفی تحت چهار گروه آزمایشی شامل: 1)شاهد، 2) کاشت ملاتونین، 3) تزریق بروموکریپتین و 4) مصرف هم‌زمان ملاتونین و بروموکریپتین قرار گرفتند. در بزهای گروه دوم، یک قرص 18 میلی‌گرمی ملاتونین در زیر پوست کاشته شد و 40 روز بعد این عمل تکرار شد. در گروه سوم، نیم میلی‌گرم بروموکریپتین برای هر کیلوگرم وزن زنده طی سه نوبت در هفته تزریق شد. در گروه چهارم، ملاتونین و بروموکریپتین با یکدیگر مصرف شد. بزها به‌مدت دو ماه در شرایط طبیعی محیط با طول دوره کوتاه روشنائی و تغذیه یکسان، از اواسط بهمن تا اوایل فروردین پرورش داده شدند. میانگین وزن بیده بزهای گروه‌های برموکریپتین، ملاتونین+بروموکریپتین، ملاتونین و شاهد به ترتیب 4/607، 3/600، 3/523 و 3/471 گرم بود و بزهای گروه بروموکریپتین و ملاتونین+ بروموکریپتین بیده بیشتری نسبت به دو گروه دیگر داشتند (05/0.(P< طول الیاف کرک گروه‌هایی که هورمون دریافت کرده بودند (2/1 سانتی‌متر) با گروه شاهد (9/0 سانتی‌متر) اختلاف داشت (01/0P<). قطر الیاف کرک بزهای شاهد (7/21 میکرون) در مقایسه با گروه‌های ملاتونین، بروموکریپتین و ملاتونین+بروموکریپتین، به‌ترتیب با مقادیر 4/18، 4/18 و 2/19 میکرون اختلاف داشت (05/0 .(P<نتایج نشان داد، که کاشت ملاتونین و بروموکریپتین باعث افزایش طول الیاف و نهایتاً تولید کرک بیش‌تر می‌شود. | ||
| کلیدواژه‌ها | ||
| طول کرک؛ قطر کرک؛ مو؛ وزن بیده؛ هورمون | ||
| عنوان مقاله [English] | ||
| Effect of melatonin and bromocryptine administration on cashmere production and fibre length growth of Raeini goats | ||
| نویسندگان [English] | ||
| M. Salehi2؛ A. Mohit3؛ Hoda Javaheri Barfourooshi2؛ | ||
| چکیده [English] | ||
| Twenty-four Raeini cashmere goat females (2 and 3 years of age and 35.0±1.4 kg BW) were used to determine effects of melatonin implants and bromocryptine on fiber growth rate (length), cashmere and hair diameter and fleece production. A completely random design was carried out. Four groups were formed: 1) control, 2) melatonin implant, 3) bromocryptine injection and 4) melatonin implant + bromocryptine injection. The experimental goats received melatonin implants subcutaneously 18 mg/kg BW at first and repeated after 40 days, group 2), bromocryptine ( 0.5 mg/kg BW per 3 days; group 3) and melatonin implant and with bromocryptine; group 4 ). All goats were fed a balanced diet under the same environmental and natural photoperiodic conditions in a 60-day, from February to March. Overall mean fleece weight were 607.4, 600.3, 523.3 and 471.3g, for bromocryptine, melatonin+bromocryptine, melatonin and control groups, respectively, being greater for bromocryptine and melatonin+bromocryptine than for the other groups (P<0.05). The cashmere fibre length of the treatment groups (1.2 cm) were significantly greater (P<0.01) than that of the control group (0.9 cm). There was a significant difference in cashmere fiber diameter for control group (21.7 micron) compared with treatment groups for melatonin, bromocryptine and melatonin+bromocryptine (18.4, 18.4 and 19.2 ± 0.9 micron, respectively). The results indicated that melatonin implantation and bromocryptine could increase fiber length and promote cashmere production continuously. | ||
| کلیدواژه‌ها [English] | ||
| Cashmere diameter, Cashmere length, Fleece weight, Hair, Hormone | ||
| مراجع | ||
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