IntroductionPlant carbon black (PCB) is a new feed additive for zearalenone adsorption in China. However, information regarding whether PCB can effectively absorb deoxynivalenol (DON) is limited.MethodsTo explore this research gap, the present study examined the adsorption effectiveness of DON by PCB using a phosphate buffer, artificial gastric juice, and artificial intestinal juice. In a 21-day in vivo trial, 48 male piglets were randomly assigned to four treatment groups: (1) uncontaminated basal diet (CTR), (2) basal diet supplemented with 1 mg/kg PCB(PCB), (3) 2.3 mg/kg DON-contaminated diet (DON), and (4) 2.3 mg/kg DON-contaminated diet supplemented with 0.1% PCB (DON+PCB).ResultsWhen DON concentration was 1 µg/mL, the adsorption rate of PCB on DON in phosphate buffer systems (pH 2.0 and 6.0) and the artificial gastric and intestinal juices were 100%, 100%, 71.46%, and 77.20%, respectively. In the in vivo trial, the DON group significantly increased the DON+deepoxy-deoxynivalenol (DOM-1) content in serum as well as the inflammation cytokine proteins (interleukin-6, interleukin-8, and tumor necrosis factor-α) and mRNA expression of interleukin-6 and longchain acyl-CoA synthetase 4 in the jejunum and ileum. It decreased the villus height, goblet cells, mucosal thickness, and mRNA expression of Claudin-1 compared to the CTR group. In addition, DON decreased the Shannon and Simpson indices; reduced the relative abundances of Firmicutes, Lactobacillus, Candidatus_Saccharimonas, and Ruminococcus; and increased the relative abundances of Terrisporobacter and Clostridium_sensu_stricto_1 in the cecal content.DiscussionIn conclusion, these results suggest that PCB showed high adsorption efficacy on DON in vitro, and exhibit the protective effects against various intestinal toxicity manifestations in DON-challenged piglets.

This study was conducted to investigate the effects of dietary flaxseed on growth performance, car?cass traits, meat quality and fatty acid composition of growing?finishing pigs. Seventy?two growing?finishing pigs with average body weight of (52.31±2.28) kg were randomly allotted into 3 groups with 4 replicates in each group and 6 pigs in each replicate. Pig in the control group were fed a basal diet, while those in the exper?imental groups were fed the basal diets supplemented with 5% and 10% flaxseed, respectively. The entire ex?periment was divided into two phases ( 50 to 80 kg and 81 to 110 kg body weight) , and all pigs were weighted at the end of each phase. In the end, two pigs with average body weight in each replicate were anaesthetized and slaughtered. The results were showed as follows: 1) compared with the control group, 5% and 10% flax?seed supplementation significantly decreased average feed intake and feed to gain ratio of pigs in 50 to 80 kg phase and significantly deceased feed to gain ratio of pigs in 50 to 110 kg phase ( P＜0.05). Meanwhile, 10%flaxseed supplementation significantly increased average daily gain of pigs in 50 to 80 kg period ( P＜0.05). 2) The flaxseed supplementation significantly increased eye muscle area ( P＜0.05) , while no significant differ?ences were observed on carcass length, slaughter rate and average backfat thickness of pigs ( P＞0.05). 3) 5%and 10% flaxseed supplementation significantly decreased the ratio of n?6 to n?3 polyunsaturated fatty acid ( PUFA) ( P＜0.05) , significantly increased the contents of α?linoleic acid, decosahedaenoic acid, docosadie?noic acid and total PUFA ( P＜0.05). Moreover, when the supplementation level reached 10%, the contents of oleic acid and linoleic acid in longissimus dorsi were significantly increased ( P＜0.05). These results indicate that the supplementation of flaxseed can improve growth performance, increase n?3 PUFA content and decrease n?6 to n?3 PUFA ratio in longissimus dorsi, and show no negative effects on carcass traits and meat quality of growing?finishing pigs.[ Chinese Journal of Animal Nutrition, 2019, 31(9) :4024?4032]

养育哺乳仔猪的目标是获得 最高的成活率和最大的断奶窝重 和个体重.为此要掌握仔猪生长 发育规律及其生理特点,采用相 应的饲养管理措施. 1 哺乳仔猪的生长发育和生理 特点 1.1 生长发育快,物质代谢旺 盛 和其他家畜比较,猪出生时 体重相对最小,还占不到成年时 体重的1%,但出生后生长发育 特别快.一般仔猪出生重在1公 斤左右,10日龄时体重增加1 倍以上,30日龄达5～6倍,60 日龄增长10～13倍或更多,体 重达15公斤以上.

大豆以其蛋白质品质好、能量高而被饲料加工业普遍接受,但因大豆中含有抗营养因子,使其各种成分不能得到充分利用.另外,为提高畜禽饲料能量水平,有些地方在饲料中添加5%～6%的脂肪,但不论是流体还是固体油脂,粘滞性都比较大,添加在饲料中都增加了混拌难度.近年来,随着人们对全脂膨化大豆粉营养价值的认识和膨化工艺的逐步完善,全脂膨化大豆粉作为高能量、高蛋白饲料资源被用在畜禽饲料中,消除了抗营养因子的阻碍作用,并提高了蛋白质、脂肪及多糖的利用率.因此,用含油脂较高的大豆加工成全脂膨化豆粉,可提高饲料能量浓度,简化加工工序,降低成本.现将几个全脂膨化大豆粉在饲料中的应用试验简述如下.