نوع مقاله : مقاله پژوهشی
نویسندگان
1 کارشناسی ارشد،گروه علوم دامی. دانشکده کشاورزی. دانشگاه زنجان
2 استاد، گروه علوم دامی، دانشکده کشاورزی، دانشگاه زنجان، زنجان، تخصص: تغذیه دام
3 استادیار بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش بخش کشاورزی استان چهارمحال و بختیاری ، شهرکرد ایران
4 استادیار،دانشگاه شهرکرد- دانشکده کشاورزی- گروه علوم دامی
5 دانشجوی دکتری، دانشگاه زنجان. گروه علوم دامی
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The objective of present study was to investigate the effect of different levels of sesame meal in early lactation cow's ration on dry matter intake, milk
yield and composition, apparent digestibility of nutrients and blood metabolites. Six dairy lactating Holstein cows with average DIM 26± 3 (n=3
primiparous and n=3 multiparous cows) were randomly assigned to 1 of 3 experimental treatments (different levels of sesame meal) in repeated 3×3
Latin square design. Experimental treatments were control (without sesame meal), 4.33% sesame meal and 8.66% sesame meal (DM basis). The
experimental periods consisted of 21 d with the first 14 days as adaptation and the last 7 days as sampling days. Increasing level of sesame meal in
early lactation rations did not affect dry matter intake, milk yield and composition (fat, protein and lactose), feed utilization efficiency, apparent
digestibility of nutrients and blood metabolites (P 0.05), while milk urea nitrogen decreased with increasing the level of sesame meal (p < 0.05).
Blood urea nitrogen concentrations also tended (P = 0.1) to decrease with increasing levels of sesame oil. In general, the lack of response in feed
intake and milk yield with increasing the levels of sesame meal in early lactation cow's ration showed that sesame meal could be a proper protein
source in early lactation cow's ration.
کلیدواژهها [English]