반추가축영양 ; 조사료중심사양에 있어서 사일리지혼합급여와 우유생산효율

Twenty-lour Holstein-Friesian lactating dairy cows were divided at random into two groups and received the following diets : 1)corn silage plus gross silage 2)corn silage plus alfalfa silage. In addition, all the cows were fed hay and concentrate at 0∼25% of milk yield. The objective was to determine the effects of feeding grass silage or alfalfa silage with corn silage based diets on gross energetic efficiency of milk production in a 24-wk studs. Gross energetic efficiency was calculated as the simple ratio between energy output in milk and energy consumed. Gross energetic efficiency was not different between com silage plus grass silage and com silage plus alfalfa silage. With advancing lactation stage, the gross energetic efficiency decreased in both treatment groups. Dry matter intake were more with corn silage plus bras, silage than com silage plus alfalfa silage because of moisture content. Four percentFCM were lightly higher in animals on corn silage plus alfalfa silage than in those on corn silage plus grass silage. It was concluded that supplementing corn silage with alfalfa silage w as effective in improving milk yield and gross energetic efficiency.