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تأثیر سن از شیرگیری بر عملکرد تولیدی و تولیدمثلی میش های لری بختیاری | ||
| علوم دامی | ||
| مقاله 17، دوره 32، شماره 125، اسفند 1398، صفحه 233-248 اصل مقاله (1.69 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/asj.2019.124314.1820 | ||
| نویسندگان | ||
| محسن باقری1؛ مرتضی کرمی* 2 | ||
| 1مربی پژوهشی بخش علوم دامی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان چهارمحال و بختیاری، سازمان تحقیقات، آموزش و ترویج کشاورزی، شهرکرد، ایران | ||
| 2استادیار پژوهشی بخش علوم دامی، مرکز تحقیقات کشاورزی و منابع طبیعی استان چهارمحال و بختیاری، سازمان تحقیقات، آموزش و ترویج کشاورزی، شهرکرد، ایران. | ||
| چکیده | ||
| هدف این تحقیق بررسی تأثیر سن از شیرگیری بره ها بر عملکرد تولیدی و تولیدمثلی میشهای لری بختیاری بود. تعداد 103 رأس میش شیرده با میانگین سنی 4 سال، در یکی از سه تیمار زیر قرار گرفتند: 1-زود از شیرگیری (شیرگیری در 60 روز پس از زایش؛ 34 رأس)، 2-شیرگیری همانند آنچه در سیستم سنتی انجام میشود (شیرگیری در 90 روز پس از زایش؛ 34 رأس) و 3-دیر از شیرگیری (شیرگیری در 120 روز پس از زایش؛ 35 رأس).60 روز پس از زایش، معرفی قوچ به گله انجام شد. از هر گروه، میش هایی که آبستن شدند در ادامه آزمایش حضور یافتند. قوچ ها در فصل جفتگیری دوباره وارد گله شدند. درصد میشهای فحل، فاصله زایش تا اولین فحلی و تا آبستنی، فاصله بین دو زایش، درصد آبستنی و تعداد بره متولد شده، رکوردگیری شد. درصد فحلی و آبستنی پس از اولین زایش، به طور معنی داری (0/05>p) در میشهای تیمار 1 بیشتر از میشهای تیمار 2 و 3 بود. بازگشت به فحلی و آبستنی پس از اولین زایش، در میشهای تیمار 1زودتر از میشهای تیمار 2و 3 اتفاق افتاد (0/01>p). متوسط فاصله بین سه زایش در میشهای تیمار 1کمتر از میشهای تیمار 2و تیمار 3بود (0/01>p). در زایش دوم، تعداد بره متولد شده به ازای هر رأس میش در معرض آمیزش، در تیمار 1 بیشتر از تیمارهای 2و 3بود (0/05>p). به عنوان نتیجه، شیرگیری بره ها در سن 60 روزگی باعث افزایش عملکرد میشها می شود. | ||
| کلیدواژه‌ها | ||
| میش؛ عملکرد؛ زود از شیرگیری؛ تولیدمثل | ||
| عنوان مقاله [English] | ||
| Effect of weaning age on productive and reproductive performance of Lori-Bakhtiari ewes | ||
| نویسندگان [English] | ||
| MOHSEN BAGHERI1؛ M. Karami2 | ||
| 1agriculture and natural resources research and education center of chaharmahal and bakhtiari | ||
| چکیده [English] | ||
| The aim of this study was to investigate the effects of lamb weaning age on subsequent productive and reproductive performance of Lori-Bakhtiari ewes. 103 heads of lactating ewes with an average age of 3.5 years were allocated to one of three treatments as: 1.weaned early 2.weaned as in traditional sheep rearing or 3-weaned late. Rams were introduced at 60 days postpartum and were remained with ewes for 3 months. Ewes that became pregnant were remained in trial. Again, rams introduced to ewes at breeding season and were remained with ewes for 6 months. The proportion of ewes that exhibit estrus, interval from lambing to first estrus and to conception, lambing interval, conception rate and number of lambs' birth per ewes exposed to the rams were recorded. Gain rate of ewes was higher for treatments 1 and 2 in first month after weaning than other months (p < 0.05). Percentage of estrus and conception rate after first parturition were significantly higher (p < 0.05) for ewes in treatment 1 than treatments 2 and 3. After first parturition, ewes in group 1, returned to estrus and conception earlier compared to 2 and 3 groups (p < 0.01). Average of 3 lambing interval was lower (p < 0.01) for group 1 ewes than groups 2 and 3 . In second parturition, the number of lambs born per ewe exposed to the ram was higher (p < 0.05) for group 1 ewes than 2 and 3 groups. It was concluded that ewe's performance were improved by weaning their lambs at 60 days of age. | ||
| کلیدواژه‌ها [English] | ||
| Ewe, Performance, Early weaning, Reproduction | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 692 تعداد دریافت فایل اصل مقاله: 437 |
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