Improvement of Fertility Performance of Farahani Ewes Raised on Supplementary Feeding
محورهای موضوعی : Camelآ. میرشمسالهی 1 , ر.ع. عزیزی 2
1 - Markazi Agricultural and Natural Resources Research and Education Center, Arak, Iran
2 - Markazi Agricultural and Natural Resources Research and Education Center, Arak, Iran
کلید واژه: Fertility, Farahani ewes, lamb’s weight, supplementary feeding,
چکیده مقاله :
This study deals with effects of supplementary feeding on fertility performance of Farahani ewes. The study was conducted using three local flocks in Arak city, Iran. Half ewes in each flock (50 ewes from each flock) were used as control group and fed according to traditional method without supplementary feed. The other half per flock was fed on supplementary feed throughout the experiment that included three stages of breeding, late Pregnancy, and lactation. Weight and body condition score was measured in all ewes before supplementary feeding at breeding and at the end of the experiment. Average weight and body condition score at the measuring period were 39.4 ± 1.3 kg and 2.09 ± 0.26 for the control group; and 42.34 ± 1.26 kg and 2.56 ± 0.34 for the experimental group, respectively. The difference between two groups was significant (P<0.01). Implementation of supplementary feeding had significant effect on the birth and weaning weights of lambs. Average birth weight of lambs in control and experimental groups was 3.38 ± 0.14 and 4.09 ± 0.14 kg, respectively. Lambs weights at one, two and three months of ages for the control group were 9.16 ± 1.4, 12.99 ± 2.03 and 22.65 ± 2.3 kg and for the experimental group were 11.23 ± 1.4, 16.55 ± 2.03 and 27.21 ± 2.3 kg, respectively (significant difference (P<0.01)). Pregnancy rates for the control and experimental group were 85.29% and 94.4%, respectively (P<0.01) and lamb mortality rates were 10.34% and 3.48%, respectively (P<0.01). These findings showed that supplementary feeding improved fertility and lambing performance. Moreover, the birth weight and weaning weight of lambs showed significant improvement as well. The overall, increasing of lambing ewes (of about 14 percent) and increase in lamb birth and weaning weights were the obtained economic benefit from this research.
این مطالعه جهت بررسی تأثیر تغذیه تکمیلی بر عملکرد تولیدمثلی میشهای توده فراهانی، بر روی سه گله از گلههای مردمی شهرستان اراک انجام شد. نیمی از میشهای هر گله به عنوان گروه شاهد در نظر گرفته شده و مطابق روش دامدار تغذیه شدند (50 میش از هر گله). نیم دیگر میشهای هر گله نیز در هر سه مرحله آزمایشی که به ترتیب شامل فصل آمیزش، یک و نیم ماه آخر دوره آبستنی و دوره شیردهی بود، غذای کمکی مصرف نمودند. وزن و نمره وضعیت بدنی تمام میشهای هر گله قبل از شروع انجام تغذیه کمکی در فصل قوچ اندازی و سپس در پایان آن اندازهگیری شد. میانگین وزن بدن و نمره وضعیت بدنی میشهای گروه شاهد در پایان مرحله آزمایشی اول به ترتیب 3/1 ± 4/39 کیلوگرم و 26/0 ± 09/2 واحد و در میشهای گروه دریافتکننده غذای کمکی به ترتیب 26 /1 ± 34/42 کیلوگرم و 34/0 ± 56/2 واحد بود که اختلاف معنیداری برای صفات مذکور بین میشهای دو گروه وجود داشت (01/0>P). انجام تغذیه تکمیلی در سه مرحله آزمایشی، اثر معنیداری بر وزن تولد تا از شیرگیری برهها داشت. میانگین وزن تولد برهها برای میشهای گروه شاهد 14/0±38/3 کیلوگرم و برای میشهای گروه تغذیه کمکی 14/0 ± 09/4 کیلوگرم بود. وزن یک تا سه ماهگی برهها نیز در گروه شاهد به ترتیب 4/1 ± 16/9 ، 03/2 ± 99/12 و 3/2 ± 65/22 کیلوگرم و در گروه تغذیه کمکی به ترتیب 4/1 ± 23/11، 03/2 ± 55/16 و 3/2 ± 21/27 کیلوگرم بود که اختلاف معنیداری بین این دو گروه وجود داشت (01/0>P). درصد باروری میشهای گروه شاهد و گروه تغذیه تکمیلی به ترتیب 29/85 و 44/94 درصد (01/0>P) و میزان تلفات بره برای این دو گروه به ترتیب 34/10 و 48/3 درصد بود (01/0>P). در مجموع نتایج حاصل از این پژوهش نشان میدهد که استفاده از غذای کمکی در مراحل فوق الذکر سبب افزایش عملکرد باروری و برهزایی میشهای فراهانی و افزایش وزن تولد و از شیرگیری برههایشان میگردد. در مجموع افزایش میزان برهزایی میشها (در حدود 14 درصد افزایش) و افزایش وزن تولد و از شیرگیری برهها، سود اقتصادی حاصل از اجرای این تحقیق بودند.
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