Application Of Expanded Double-Low Rapeseed In The Diets Of Lactation Sows

Expanded double-low rapeseed replacing expanded soybean as energy feed was evaluated in the diets of Landrace × Large White lactation sows. Effect of expanded double-low rapeseed on performance, milk composition, serum composition, diets digestibility of lactation sows and litter performance were studied. It was explored the optimum proporation of expanded double-low rapeseed to add directly to lactation diets. Four diets with the same level of protein and energy were formulated to meet the NRC (1998) nutrient requirements through directly increasing of expanded double-low rapeseed levels (0%, 10%, 15%, 20%) . The twenty-eight Landrace × Large White multiparous lactation sows were assigned randomly into four groups in this experiment. The lactation sows in the control group were fed the control diet which contained no supplemental expanded double-low rapeseed. The lactation sows in group 1, group 2 and group 3 were fed diets which contained 10%, 15%, 20% expanded double-low rapeseed respectively. Experimental period lasted 28 days. During the period, feed intake of lactation sows per day were recorded. On parturition day and the 28^th day, backfat thickness, body weight of lactation sows were recorded respectively. On parturition day, the 21^th day and the 28^th day, the litter weight, number of died piglets were recorded respectively. On the 21^th day, the milk was collected to determine protein, fat, solids, calcium, phosphorus, iron and zinc of milk; the serum was collected to determine the ALT, AST, T₄, TSH and T₃ of serum. During the last three days, it was conducted to examine the apparent digestibility coefficient of four diets by lactation sows. The main results were summarized as follows:1. When the percentage of expanded double-low rapeseed in diets of lactation sows summed to 10%, ADFI of lactation sows during the 28-day lactation period was biggest, and significant difference to control group (P<0.05) , the body weight losses and backfat thickness losses were lowest in all groups; the ADFI of 15% expanded double-low rapeseed group was decreased but no significant difference to control group (P>0.05) ; the ADFI of 20% expanded double-low rapeseed group decreased significantly to control group (P<0.05) . The body weight losses of 20% expanded double-low rapeseed group decreased significantly to control group (P<0.05 ) , but no significant difference among other three groups (P>0.05) .The loss of backfat thickness was no significant difference among all groups (P>0.05) .2. When the percentage of expanded double-low rapeseed in diets of lactation sows summed to 10%, litter weight of piglets on 21^th, 28^th and the litter weight gain during...