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
کلیدواژهها
عنوان مقاله [English]
نویسندگان [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]