| In the actual production,the feeding mode of “low pregnancy and high lactation” is usually adopted to ensure the optimal fecundity of the sows.However,excessive restriction of feeding makes the sows less satisfied during pregnancy,and stereotypes occur frequently,resulting in decreased reproductive performance of the sows.The effect of dietary fiber on the stereotypic behavior and reproductive performance of sows varies with their source and level.It is inconclusive as to which source of dietary fiber can reduce the stereotyped behavior of pregnant sows and improve the reproductive performance of sows.The aim of this study was to investigate the effects of dietary fiber from different sources during pregnancy on stereotypes,satiety hormones,stress hormones and their production performance.A total of 112 healthy(3-8 parities,Large White×Landrace crossbed),sows were randomly assigned to 4 groups based on weight and parity,each with 28 replicates,one pig per replicate,ie the control group,15% wheat aleurone powder group,5% resistant starch group,5% fermented soybean fiber group.The diet energy and crude protein levels in the control group and the test group were consistent,and the neutral detergent fiber levels in the test group were consistent.Resistant starch diets have higher absorption and viscosity than other diets.Feeding the corresponding gestational diet from the sow breeding until the sow is delivered to the delivery room,feeding a uniform lactation diet during lactation,and recording and counting the sow’s body weight,backfat,reproductive performance and lactation performance.Two hours after the morning feeding in the morning of 72-74 days of pregnancy,the sow stereotypic behavior was recorded and counted.The blood of the sow was collected before the pregnancy in the sky of pregnancy 109 to measure the oxidative stress index.The results were as follows: 1)Dietary treatment had no significant effect on sow weight backfat(P>0.05);2)Dietary treatment had no significant effect on sow lactation intake and piglet growth rate(P>0.05);Compared with the control group,although the diet treatment had no significant effect on the total litter size,litter size and piglet birth weight(P>0.05),5% resistant starch and 15% wheat aleurone powder group had The trend of reducing the number of stillbirths(P =0.08),and significantly reduced the stillbirth rate(P<0.01);4)Compared with the control group,the proportion of sow standing time in the 5% resistant starch group(P = 0.09)and the number of postural changes in the 15% wheat aleurone powder group(P = 0.1)decreased.In addition,compared with the control group,the PYY concentration was significantly higher in the 5% resistant starch group sows after two hours of feeding(P<0.05),and the GLP-1 concentration in the 5% resistant starch group sows after two hours of feeding.Higher trend(P=0.06).5)Compared with the control group,the plasma cortisol concentration of the 5% resistant starch group had a lower trend(P=0.06),and the 15% wheat aleurone powder group had a significantly lower salivary cortisol concentration(P< 0.05).6)Compared with the control group,the total antioxidant capacity of the serum of the 15% wheat aleurone powder group was significantly increased(P<0.05),and the 5% of the resistant starch histone hydroxyl group was significantly decreased(P<0.05)..7)Each treatment had no significant effect on the water content and anus temperature of pregnant sows(P>0.05).The economic benefit analysis shows that the 15% wheat aleurone powder group has the lowest cost for producing live pigs and healthy piglets.In summary,the addition of dietary fiber from different sources during pregnancy has different effects on postprandial stereotypic behavior,satiety,stress hormone levels and litter performance in sows.Pregnancy diets are supplemented with resistant starch and wheat paste.Powdered powder reduces the rate of stillbirth in sows,which is closely related to reducing stereotypes and alleviating oxidative stress. |
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