A higher proportion of female lambs in Kurdish × Romanov ewes fed a diet rich in n-3 fatty acids and rumen undegradable protein around mating

Document Type : Research Paper

Authors

1 Department of Animal Science, Ilam University, Ilam, I. R. Iran.

2 Animal Science Research Department, Ilam Agricultural and Natural Resources Research and Education Centre, AREEO, Ilam, I. R. Iran

3 Department of Animal Science, Chaharmahal and Bakhtiari Agricultural and Natural Resources Research and Education Centre, AREEO, Shahrekord 88156–89554, I. R. Iran

4 Department of Animal Science, School of Agriculture, Shiraz University, Shiraz 71441–65186, I. R. Iran

5 NSW Department of Primary Industries, Wagga Agricultural Institute,

Abstract

An increased intake of rumen undegradable protein (RUP) or n-3 fatty acids (FA) around mating is connected with improved reproductive efficiency in ewes. This experiment was aimed to study whether the ratio of female lambs was greater when Kurdish × Romanov ewes were received a diet rich in n-3 FA and RUP together around mating. Experimental diets were supplemented with 5% (DM basis) Ca salts of saturated FA (SFA), 5% Ca salts of fish oil (as n-3 FA source; n-3FO), or a combination of 5% Ca salts of fish oil and 5% fish meal (as a RUP source; n-3FO+RUP). The results showed that the proportion of total n-3 polyunsaturated FA (PUFA) in plasma increased and the n-6:n-3 decreased at CIDR removal day in animals received the n-3FO+RUP diet (P < 0.05) compared with the other diets. Plasma concentrations of oestradiol, glucose, and urea nitrogen (UN) at the day of oestrus (P < 0.05) was also lower when ewes received the n-3FO+RUP diet compared with the other diets. The ratio of female lambs was greater when ewes were fed the n-3FO+RUP diet around mating (P < 0.05) and was greater than an expected 50:50 ratio (72% females, P = 0.028). It was concluded that feeding ewes a diet rich in n-3 FA and RUP content around mating, rather than n-3 FA alone, could skew the sex ratio of lambs toward females. 

Keywords

Main Subjects

Article Title [Persian]

افزایش نسبت ماده زایی در میش های کردی - رومانوف با تغذیه جیره دارای اسید چرب امگا -3 و پروتئین غیر قابل تجزیه در شکمبه در زمان نزدیک به جفت گیری

Authors [Persian]

  • مرضیه فتاحی 1
  • فرشید فتاح نیا 1
  • هوشنگ جعفری 2
  • گلناز تأسلی 3
  • امین اله پورملکشاهی 2
  • شهریار کارگر 4
  • ادوارد. اچ کلایتون 5
1 دانش آموخته کارشناسی ارشد تغذیه دام گروه علوم دامی دانشکده کشاورزی دانشگاه ایلام.
2 استادیار پژوهشی بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان ایلام، ‏سازمان تحقیقات، آموزش و ترویج کشاورزی،
3 استادیار پژوهشی بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان چهارمحال و بختیاری، ‏سازمان تحقیقات،
4 گروه علوم دامی دانشکده کشاورزی دانشگاه شیراز
5 عضو هیئت علمی بخش صنایع اولیه کشاورزی، مؤسسه کشاورزی واگا، نیوساوت ولز، استرالیا
Abstract [Persian]

مصرف پروتئین غیرقابل تجزیه در شکمبه و یا اسیدچرب امگا-3 در زمان نزدیک به جفت‌گیری در میش باعث بهبود عملکرد تولیدمثلی میش شده است. هدف پژوهش حاضر این بود که آیا مصرف پروتئین غیرقابل تجزیه در شکمبه و اسیدچرب امگا-3 در زمان نزدیک به جفت‌گیری در میش‌های باعث افزایش نسبت بره‌های ماده متولد شده می‌شود. جیره‌های آزمایشی شامل جیره دارای 5 درصد (بر اساس ماده خشک) مکمل اسیدهای چرب اشباع، جیره دارای 5 درصد مکمل اسیدهای چرب امگا-3 و جیره دارای 5 درصد اسیدهای چرب امگا-3 و 5 درصد پودر ماهی بودند. نتایج نشان داد که در روز برداشت سیدر مقدار اسیدهای چرب با چند پیوند دوگانه و نسبت اسیدهای چرب امگا-6 به امگا-3 پلاسما در میش‌های تغذیه شده با جیره دارای نمک کلسیمی اسیدهای چرب امگا-3 و پروتئین غیرقابل تجزیه در شکمبه، به‌ترتیب بیشتر و کمتر از سایر گروه‌ها بود (0/05 > P)  غلظت استرادیول، گلوکز و اوره پلاسما در روز فحلی در میش‌های تغذیه شده با جیره دارای اسیدهای چرب امگا-3 و پروتئین غیرقابل تجزیه در شکمبه در مقایسه با سایر گروه‌ها پایین‌تر(0/05 > P)  و درصد بره‌های ماده بالاتر (72 درصد، 0/028= P) از میزان مورد انتظار 50:50 بود. تغذیه جیره دارای اسیدهای چرب امگا-3 و پروتئین غیرقابل تجزیه در شکمبه در زمان نزدیک به جفت‌گیری باعث افزایش تعداد بره‌های ماده شد.

Keywords [Persian]

  • برنامه ریزی جنینی
  • نسبت جنسی بره
  • اسید چرب امگا-3
  • پروتئین غیر قابل تجزیه در شکمبه

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Iran Agricultural Research
Volume 42, Issue 2
November 2023
Pages 100-109

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