Data/hora: 06/06/2024 04:32:28

Provedor de dados: | 19
País: | Japan

Título:

アルファルファおよびコーンサイレージ給与割合の違いが泌乳牛の窒素利用と乳生産に及ぼす影響

Effect of different proportion of alfalfa silage and corn silage on the nitrogen utilization and milk production of dairy cows

Autores: | 河合, 正人; 市川, 雅賢; 大谷, 昌之; 池滝, 孝; 松岡, 栄; KAWAI, Masahito; ICHIKAWA, Masayoshi; OTANI, Masayuki; IKETAKI, Takashi; MATSUOKA, Sakae.
Data: | 2002-03
Ano: | 2002
Palavras-chave: | アルファルファサイレージ; コーンサイレージ; 分解性タンパク質; 窒素利用性; 乳生産; Alfalfa silage; Corn silage; Degradable intake protein; Nitrogen utilization; Milk production.
Resumo: | The objective was to evaluate the effect of different proportion of alfalfa silage and corn silage on the nitrogen utilization and milk production of dairy cows. Eighteen lactating Holstein cows were divided into three treatment groups. The cows in the three treatment groups were fed mixture of alfalfa silage and corn silage，which were formulated (dry matter basis) at 1) 80:20 (AS80)，2) 60:40 (AS60) and 3) 40:60 (AS40) ratios，respectively. Grass hay and concentrate were fed also to adjust silage ratio (65% of total DM)，roughage ratio (70% of total DM) and CP contents  (15%DM) of the diets among AS80，AS60 and AS40. The ratio of degradable intake protein (DIP) to non-fibrous carbohydrate (NFC) in AS80，AS60 and AS40 were 0.27，0.27 and 0.28，respectively. Milk yield and composition were not affected by the proportion of corn silage. FCM yield was 24.5-26.4 kg/d/cow， milk fat content was 3.73-3.99% and milk protein content was 3.10-3.30%. Dry matter intake of AS80 was lower than that of AS60 and AS40  (Pく0.05)，and tbe body fat was mobilized to keep milk production in cows fed AS80. The efficiency of nitrogen utilization for milk (milk protein / DIP intake) was decreased when cows were fed AS40 because of larger ratio of DIP intake to NFC intake. It is concluded that AS60 was the most effective diet in respect of dry matter intake and nitrogen utilization in middle and late lactation period. アルファルファサイレージとコーンサイレージを異 なる割合で泌乳牛に給与し，窒素利用と乳生産に及ぽ す影響について検討した.ホルスタイン種泌乳牛18頭 を供試し6頭ずつ3群に分けた.アルファルファサイレージとコーンサイレージを乾物比で80 : 20(AS80区)， 60 : 40(AS60区)， 40 : 60(AS 40区)の割合で混合給与した.さらに粗濃比が7 : 3 (サイレージ混合割合65%)でCP含量が各処理区間で同程度となるように乾草と濃厚飼料を給与した給与飼料 中の非繊維性炭水化物(NFC)に対する分解性タンパク質(DIP)の割合は， AS80， AS60およびAS40区 でそれぞれ0.27，0.27および0.28であった.乳量お よび乳成分は各処理区間で差がなく，FCM生産量は 24.5-26.4 kg/日/頭，乳脂率は3.73-3.99%，乳タン パク質率は3.10-3.30%の範囲であった.代謝体重あ たりの乾物摂取量はAS80区でAS60区およびAS40区より少なく(P&lt;0.05)，AS80区では体脂肪 動員がみられた. AS40区ではNFC摂取量に対する DIP摂取量の割合が高く， DIP摂取量に対する乳タン パク質生産量の割合で示した乳への窒素利用効率が他 の処理区より低かった(Pく0.05).これらの結果から， 乾物摂取量や窒素利用の点からみて，泌乳中後期にお いてはAS60区がもっとも適当なサイレージ混合割合であったと考えられた.
Idioma: | Japonês
Identificador: | http://ir.obihiro.ac.jp/dspace/handle/10322/3012
Editor: | 北海道畜産学会
Formato: | application/pdf
Fonte: | 北海道畜産学会