Lysine Requirements of Multiparous Sows during Mid and Late Pregnancy and Mid Lactating Periods
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The lysine requirements of multiparous sows during mid (day 50 to 65 postcoitum) and late pregnancy (day 90 to 105) and mid lactating (day 12 to 21 postpartum) periods were determined using the concentration of plasma free lysine as a response criterion. Five (0.1-0.5%) and six (0.42-1.02%) levels of dietary lysine for pregnant and lactating periods, respectively, were made by adding corn starch or soybean meal to a corn basal diet. Small amounts of free amino acids (i. e. DL-methionine, L-threonine and L-valine) were added to keep lysine the first limiting amino acid for all the experimental diets. Each diet was fed at 2.5kg daily in the mid pregnancy period and ad libitum in the late pregnancy and mid lactating periods for 3 days. A blood sample was taken on the third day of each period to determine the concentration of plasma free lysine. The lysine requirements were estimated from a break point where the concentration of plasma free lysine began to increase. The results obtained were as follows: 1) From concentration of plasma free lysine as a response criterion, the daily lysine requirements for mid, late pregnancy and mid lactating periods were estimated to be 6.7, 20.4 and 42.3g, respectively. 2) On the basis of the daily lysine requirements estimated using plasma free lysine, lysine requirements expressed as a percent of diet for mid and late pregnancy and mid lactating periods were calculated to be 0.29, 0.89 and 0.75%, respectively. 3) From the results of the present study, it was clear that there was a considerable difference between the lysine requirements during the mid and late pregnancy periods. Thus, it is suggested that the dietary lysine levels should vary with the progress of pregnancy.
- 公益社団法人 日本畜産学会の論文
公益社団法人 日本畜産学会 | 論文
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