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بررسی همبستگی بین تولید و ترکیب شیر و ارزش اصلاحی آن ها با میزان متان پیش بینی شده از طریق اسیدهای چرب فرار در گاوهای هلشتاین ایران

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

2 استاد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

3 استادیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

4 دانشیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

5 استادیار، گروه علوم دامی، دانشکده علوم کشاورزی و زیستی، دانشگاه ایالتی آیووا آمریکا

چکیده

در سیستم تولیدی نشخوارکنندگان، هر حیوان روزانه 500-250 لیتر متان تولید می­کند به‌طوری‌که تخمین زده شده است میزان مشارکت نشخوراکنندگان در گرمای جهان معادل با 10-8 درصد در طول 100-50 سال آینده می­باشد. هدف از این تحقیق بررسی مقدار همبستگی میزان متان (پیش­بینی­شده از طریق اسیدهای چرب فرار) با صفات تولید شیر، اجزای متشکل آن و ارزش­های اصلاحی این صفات در گاوهای هلشتاین ایران می­باشد. در این راستا مایع شکمبه از دو زیر جمعیت 75 راسی به روش لوله مری جمع­آوری گردید (زیر جمعیت­ها از نظر ارزش اصلاحی تولید شیر با یکدیگر متفاوت بودند). آنالیز داده­ها در محیط R.3.3.0 انجام شد. نتایج حاصل از این آزمایش نشان داد که مقدار متان پیش­بینی­شده به‌ازای یک واحد شیر و چربی در دو زیر جمعیت تفاوت بسیار معنی‌داری با یکدیگر دارند (0001/0P <). همچنین در این پژوهش مشخص گردید که ارزش اصلاحی صفات مرتبط با تولید و ترکیب شیر با میزان متان تولید شده به‌ازای یک واحد محصول دارای همبستگی منفی ضعیف تا متوسط می­باشند (05/0P <). بیشترین مقدار همبستگی میان تولید روزانه چربی با میزان متان تولیدی به‌ازای یک کیلوگرم چربی (79/0-) و تولید روزانه شیر با میزان متان تولیدی به‌ازای یک گیلوگرم شیر (62/0-) بود. این نتایج نشان می­دهد که احتمالا میزان متان تولیدی را می­توان به‌طور غیر مستقیم و از طریق صفات که دارای همبستگی بالا با این انتشار متان هستند (مانند تولید روزانه چربی یا شیر) در هر نسل کاهش داد.

کلیدواژه‌ها


عنوان مقاله [English]

Study of the correlation among milk production traits, its components and the breeding value of these traits with predicted methane using volatile fatty acids in Iranian Holstein cattle

نویسندگان [English]

  • Ali Jalil Sarghale 1
  • Mohammad Moradi Shahre Babak 2
  • Hossein Moradi Shahrbabak 3
  • Ardeshir Nejati Javaremi 4
  • Mahdi Saatchi 5
1 Ph.D. Candidate, Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Iran
2 Professor, Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
3 Assistant Professor, Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
4 Associate Professor, Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
5 Assistant Professor, Department of Animal Science, College of Agriculture and Life Sciences, Iowa State University, USA
چکیده [English]

The methane production from ruminant production system was estimated to reach 250-500 L per animal per day which has been reported to contribute up to 8-10 % of global warming during the next 50-100 years. The aim of this study was to investigate the correlation among methane emission (predicted by volatile fatty acids) with milk production traits, its components and breeding values (BV) of these traits in Iranian Holstein cattle. The rumen digesta was obtained from 150 cattle through stomach tubing and this population divided into 2 groups with 75 cattle in each (the groups have different milk production BV). Data were analyzed by R.3.3.0. The results showed that methane emission per unit of milk and fat were different in the two groups (P<0.0001). Also, the BVs of milk production, fat and protein traits and daily production of milk, fat and protein had weak to moderate negative correlation with methane emission per unit(P<0.05). The highest correlation was observed between daily production of fat with methane emission per unit of fat (-0.79) as well as daily milk production with methane emission per unit of milk (-0.62). These results showed that methane emission may be reduced by indirect selection per generation for the traits had a high correlation with the gas (daily production of milk and fat).

کلیدواژه‌ها [English]

  • Breeding value
  • Correlation
  • Iranian Holstein cattle
  • methane
  • production and component of milk
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