Effect of Increasing Addition of Algae Powder on the DHA Content and Conversion Efficiency of Milk in Newly Produced Cows
This experiment was conducted to investigate the changes of docosahexaenoic acid(DHA)content and conversion efficiency in milk of primiparous and multiparous newly produced cows over time by increasing the amount of coated algal powder in diet.The results showed that when the algal powder added was increased from 165 g/head/d to 400 g/head/d,the DHA content in milk of multiparous newly produced cows increased from 5.15 mg/100 mL to 10 mg/100 mL,while the DHA conversion efficiency remained stable at about 9.5%.The DHA content in milk of primiparous newly produced cows increased from 7.76 mg/100 mL to 9 mg/100 mL,while the DHA conversion efficiency decreased significantly from 15.9%to 9.0%with the increase of algal powder feeding.It is concluded that increasing the algal powder feeding of multiparous newly produced cows during the peak of calves can be used as a mean to avoid the decrease of DHA content in milk of the whole group.For primiparous newly produced cows,increasing the algal powder feeding has limited effect on the increase of DHA content in milk,and seriously reduces the DHA conversion efficiency,resulting in waste of raw materials.Therefore,it is suggested to manage primiparous and multiparous newly produced cows separately and adopt different algal powder feeding amounts to reduce costs.
Docosahexaenoic acidConversion efficiencyCoated algae powderPrimiparous newly produced cowsMultiparous newly produced cows
NETL
NSTL
万方数据
