This study evaluated the relationships between sow parity, prepartum faecal score, farrowing and umbilical cord traits, and reproductive performance. Data were obtained from sows of different parities on commercial farms with records of litter characteristics, farrowing intervals and duration, prepartum faecal scores, and umbilical cord artery and vein diameters. Fourth- and sixth-parity sows produced more total piglets and live-born healthy piglets than first-parity sows, while piglets born to second- to fourth-parity sows had higher live birthweights. Parity did not influence the number of piglets born weak or perinatal mortality rates. Faecal scores of 3.00–3.99 and >4.00 three days prepartum were associated with increased numbers of healthy piglets and reduced numbers of stillborn piglets. Short farrowing intervals (<10 minutes) were numerically associated with higher numbers of live-born piglets and fewer stillborn piglets per litter, although these differences were not statistically significant, and a tendency towards an increased number of piglets born weak was observed. Prolonged farrowing duration was associated with increased perinatal mortality. A higher umbilical cord vein diameter was associated with increased live birthweights and fewer piglets born weak, whereas umbilical artery diameter showed no clear association with reproductive performance. Stillbirths tended to increase with umbilical cord vein diameters of 3.6–4.0 mm. These results indicate that sow parity, prepartum faecal score, farrowing traits, and umbilical cord vein traits are closely associated with reproductive outcomes and perinatal mortality. Optimising gastrointestinal function during the prepartum period and improving farrowing management may contribute to enhanced piglet viability and birthweight. (Submitted 27 June 2023; Accepted 10 February 2026; Published 23 February 2026)

This study evaluated the effects of supplementing a reduced-energy diet with a compound enzyme on sow performance, nutrient utilisation, and faecal characteristics. Thirty healthy multiparous Danish hybrid sows with similar parities and expected farrowing dates were randomly assigned to a control diet, a negative control diet (50 kcal/t less net energy), or a multi-enzyme diet (negative control diet + 150 g/t of a compound enzyme product). The three experimental diets were fed from day 85 of gestation until weaning. During lactation, feed intake tended to be higher in sows fed the control and multi-enzyme diets than in those fed the negative control diet. Body condition parameters and reproductive performance traits (litter weight, birthweight, and numbers of live-born, healthy, and stillborn piglets) did not differ among the dietary treatments. Compared with the negative control group, sows receiving the multi-enzyme diet showed improved faecal characteristics during the periparturient period and lactation, whereas a higher incidence of constipation was observed in sows fed the negative control diet. Apparent digestibility of crude protein and dietary fibre was higher in the multi-enzyme group than in the control and negative control groups, while fat digestibility was higher in the control and multi-enzyme groups than in the negative control group. Piglets from the negative control group tended to show a higher incidence of diarrhoea during lactation. In conclusion, supplementing a reduced-energy diet with a compound enzyme improved nutrient digestibility and faecal characteristics in sows, whereas effects on reproductive performance and piglet growth were limited under the conditions of this study. (Submitted 4 March 2026; Accepted 10 July 2026; Published 29 July 2026)

IntroductionDietary fibre in late gestation may affect sow physiology, colostrum quality, gut microbiota, and piglet performance. This study examined whether increasing fibre levels enhances sow health and reproductive outcomes.MethodsForty pregnant Landrace × Yorkshire sows (parity 2 or 4) were allocated to either a low-fibre (LF, 5.2%) or high-fibre (HF, 7.7%) diet from day 85 of gestation until parturition, after which all sows received a common lactation diet. Sow performance, constipation, nutrient digestibility, colostrum quality, cord blood parameters, and gut microbiota profiles were assessed. Piglet growth performance was recorded until weaning. Correlation analyses were conducted to examine associations between bacterial taxa and physiological indicators.ResultsHF sows showed improved piglet vitality (p < 0.05), higher faecal scores, and lower constipation rates (p < 0.05). Colostrum protein, total solids, IgA, and IgM concentrations were increased in HF sows (p < 0.05). Cord blood glucose and IL-10 were reduced, whereas eNOS was elevated (p < 0.05). Digestibility of crude fibre, ADF, and NDF increased, while protein digestibility decreased (p < 0.05). Gut microbiota analysis indicated increased abundances of Lactobacillus, Lachnospiraceae_XPB1014_group, and Methanobrevibacter, and decreased Treponema, Prevotellaceae_UCG-001, and Escherichia-Shigella. Piglets from HF sows exhibited greater average daily gain and weaning weight (p < 0.05). Beneficial associations were observed for Lactobacillus, Terrisporobacter, and Lachnospiraceae_XPB1014_group with reproductive traits; Phascolarctobacterium and X-Eubacterium_ruminantium_group correlated with piglet growth; while Treponema and Rikenellaceae_RC9_gut_group were negatively associated with constipation.DiscussionHigher dietary fibre in late gestation improved gastrointestinal function, colostrum quality, and piglet growth, likely through enhanced fibre digestibility and favourable modulation of gut microbiota. These findings support increased fibre supplementation to optimise sow and piglet health.

This study aimed to evaluate the effects of silymarin supplementation during late gestation on reproductive performance, haematological parameters, antioxidant capacity, and gut microbiota composition in sows. Twenty parity-4 crossbred sows (Landrace x Yorkshire) were enrolled and randomly allocated in parity blocks to either a control group (CG; n = 10, basal diet) or a silymarin-supplemented group (SIL; n = 10, basal diet + 200 mg/kg silymarin). The experimental period extended from day 85 of gestation to the completion of farrowing. The results demonstrated that dietary silymarin significantly reduced the number of stillbirths (P < 0.05), without exerting a significant effect on the total number and proportion of live-born piglets (P > 0.05). No notable differences were observed in haematological parameters between the two groups (P > 0.05). However, catalase (CAT) activity and total antioxidant capacity (T-AOC) were significantly elevated in the silymarin group (P < 0.05), and superoxide dismutase (SOD) showed a tendency to increase (P = 0.078). High-throughput 16S rRNA sequencing revealed 1 671 unique feature sequences in the silymarin group and 1 073 in the control group, with 1 600 sequences shared between the two groups. A trend towards increased dominance was observed in the silymarin group (P = 0.082), while both the Shannon and Simpson indices tended to decline (P = 0.087; P = 0.082), suggesting a possible reduction in microbial diversity. Principal coordinate analysis (PCoA) of I3-diversity revealed significant structural differences in gut microbiota between the two groups. SIMPER analysis identified Terrisporobacter as the principal genus contributing to these differences. In conclusion, silymarin supplementation during late gestation may enhance reproductive outcomes in sows, potentially through modulation of gut microbial composition and enhancement of systemic antioxidant status.

This study aimed to investigate the effects of silymarin supplementation on sow health, reproductive performance, colostrum quality, immune function, and blood biochemistry during late pregnancy. Twenty parity-4 sows (Landrace × Yorkshire) were included in the study and randomly assigned within each parity group to a control diet (CG, basic diet, n = 10) and a Silymarin diet (SIL, basic diet + 0.2 g/kg SIL, n = 10), from the 85th day of gestation until weaning. Blood and milk samples were collected for analysis. The results demonstrated that silymarin supplementation significantly reduced the number of stillbirths and the stillbirth rate (P < 0.05). Additionally, silymarin supplementation tended to increase the mean body weight of newborn and healthy piglets (P = 0.10; P = 0.08) and improved the intrauterine growth restriction (IUGR) score (P = 0.07). Silymarin supplementation also significantly increased protein content in sow colostrum (P < 0.05) and showed a trend towards higher total solids and lactose content (P = 0.05; P = 0.09). Furthermore, silymarin supplementation significantly increased immunoglobulin G (IgG), IgA, and IgM levels in sow colostrum (P < 0.05), as well as proline content (P = 0.10). It also significantly increased endothelial nitric oxide synthase (eNOS) levels in umbilical cord blood (P < 0.05). Moreover, silymarin supplementation reduced interleukin-6 (IL-6) levels and increased interleukin-10 (IL-10) levels in umbilical cord blood serum (P < 0.05). In conclusion, silymarin supplementation in late-gestation sow diets has no adverse effects on sow or piglet health. Instead, it promotes placental vascular development, reduces inflammation, and decreases stillbirth and IUGR rates. It also enhances the average birth weight of viable piglets and modulates the composition of sow colostrum, enriching key nutrients, immunoglobulins, and amino acids.

Genistin is an isoflavone of soybean, with estrogenic activity. This experiment was conducted to investigate its effect on reproductive performance, antioxidant capacity, and immunity in gestating sows. Seventy-two sows (Landrace × Yorkshire) were selected and randomly divided into two treatment groups (n = 36) based on their backfat thickness, parity and fed with basal diet or supplementation of 150 mg/ kg genistin to the basal diet based on DMI for the entire gestation period. Results showed that dietary genistin supplementation significantly increased the average number of live born per litter (p < 0.05), and tended to increase the number of healthy piglets per litter (p = 0.058), but decreased the average weight of live born per litter (p < 0.05). Dietary genistin supplementation significantly decreased the number of mummified and stillbirths per litter (p < 0.05). Moreover, the average daily feed intake (ADFI) and total feed intake of the gestating sows were also increased in the genistin-supplemented group (p < 0.05). Genistin significantly increased the serum concentrations of catalase (CAT), immunoglobulin A (IgA), IgG, and IgM at 35 days of gestation (p < 0.05). The serum concentrations of interleukin-10 (IL-10) and interferon-γ (IFN-γ) were also increased upon genistin supplementation (p < 0.05). However, genistin supplementation tended to decrease the serum concentrations of total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), and leptin at 85 days of gestation (p = 0.081 and p = 0.096, respectively). Interestingly, genistin supplementation decreased the transcript abundance of interferon-γ (IFN-γ) and placental imprinting gene H19, but significantly increased the transcript abundance of insulin-like growth factor I (IGF-I) and amino acid transporters such as the sodium-coupled neutral amino acid transporter 2 (SNTA2) and SNAT4 in the placenta (p < 0.05). These results suggested that dietary genistin supplementation during gestation can improve the reproductive performance of sows, which was probably associated with improving of antioxidant capacity and immunity, as well as changes of transcript abundance of critical functional genes in the placenta.

Fermented feed has the advantages of green, safety, good palatability, promoting growth, enhancing immunity, reducing cost and increasing efficiency, etc. It can be used as an antibiotic substitute in animal production. In this paper, the common strains, classification, quality evaluation, physiological function of fermented feed, and the effect of fermented feed in animal production were summarized, the existing problems and solutions of fermented feed at present were analyzed, and the development trend of fermented feed was prospected, which provided references for the wider application of fermented feed in animal production.

This experiment aimed to study the effects of guanidine acetic acid (GAA) on reproductive performance, lactation performance and blood biochemical indices of sows, as well as the performance of offspring piglets. A total of 20 sows (Landrace × Yorkshire, parity 4) were used. Half of the sows in each parity were fed a control diet (CG; basic diet, n = 10) or GAA diet (basic diet +1 g/kg GAA, n = 10) from the 85th day of gestation until weaning. The study results are presented as follows: Supplementation of GAA from late gestation to lactation did not adversely affect sow feed intake, backfat thickness, or blood routine indexes (p > 0.05). GAA supplementation showed a tendency to increase the number of healthy piglets and their birth activity (p = 0.06; p = 0.08), while significantly increasing the IUGR score of piglets (p < 0.05). GAA supplementation significantly increased colostrum protein content (p < 0.05) and tended to increase daily milk yield in sows (p = 0.07). GAA supplementation increased the level of immunoglobulin A in sow colostrum (p < 0.05) and showed a tendency to increase proline content (p = 0.10). GAA supplementation significantly decreased triglyceride content in sow cord blood (p < 0.05), with no significant effects observed on HDL-C, LDL-C, TC, and GLU (p > 0.05). GAA supplementation significantly increased eNOS levels in sow cord blood (p < 0.05), while showing no significant effects on IL-6 and IL-10 (p > 0.05). GAA supplementation did not significantly affect the α diversity of sow intestinal flora (ACE, Shannon, Chao1, Simpson, observed_otus, pielou_e, and good_cover), but PCoA analysis revealed differences in intestinal flora structure between groups. Additionally, GAA decreased the relative abundance of Sarciha and unidentified_ruminococcaceae and increased the relative abundance of Lactobacillus, Parabacteroides, and Pedobacter in the gut. GAA boosts nitric oxide synthase in sows’ umbilical cord blood, enhancing placental blood vessel development. This improves piglet health and vitality, increases beneficial gut bacteria (Lactobacillus, Parabacteroides, Pedobacter), and raises colostrum protein levels and lactation volume, leading to better piglet growth and performance.

植物细胞壁包含纤维素、半纤维素和木质素等,纤维素和半纤维素是植物细胞壁最适合被利用的优质成分.非淀粉多糖(NSP)是指不包括淀粉在内的1种复合多糖,也是1种细胞壁多糖.它是除木质素外纤维结构中最重要的成分,纤维对家禽肠道功能调节起到重要作用.目前,微生物领域注重纤维在家禽生产性能、机体健康以及肠道菌群均衡调控等机制的研究.文章首先叙述NSP在家禽生产中的应用研究,探讨NSP在家禽生产性能、机体健康以及肠道菌群平衡中存在的意义,总结其在畜牧生产应用中存在的问题并提出相应的解决方法,旨在为促进家禽生产性能与肠道健康的相关研究提供参考.

Capsaicin is an alkaloid isolated from peppers and is widely used as spice. Previous studies have shown that capsaicin has pleiotropic effects, such as anti-inflammatory, antioxidant and anticancer effects, but less attention has been paid to its effects on animal intestinal function and intestinal microflora composition. In this paper, the regulatory effect of capsaicin on animal intestinal function and intestinal microflora was reviewed, and its action mechanism in relieving the occurrence and development of animal intestinal inflammation was described, so as to provide a theoretical basis for the application of capsaicin in maintaining intestinal homeostasis.

As a foodborne pathogen of global importance, Salmonella enterica serovar Enteritidis (S. Enteritidis) is a threat to public health that is mainly spread by poultry products. Intestinal Enterobacteriaceae can inhibit the colonization of S. Enteritidis and are regarded as a potential antibiotic substitute. We investigated, in chicks, the anti-S. Enteritidis effects of Escherichia coli (E. coli) Nissle 1917, the most well-known probiotic member of Enterobacteriaceae. Eighty 1-d-old healthy female AA broilers were randomly divided into 4 groups, with 20 in each group, namely the negative control (group P), the E. coli Nissle 1917-treated group (group N), the S. Enteritidis-infected group (group S) and the E. coli Nissle 1917-treated and S. Enteritidis-infected group (group NS). From d 5 to 7, chicks in groups N and NS were orally gavaged once a day with E. coli Nissle 1917 and in groups P and S were administered the same volume of sterile PBS. At d 8, the chicks in groups S and NS were orally gavaged with S. Enteritidis and in groups P and N were administered the same volume of sterile PBS. Sampling was conducted 24 h after challenge. Results showed that gavage of E. coli Nissle 1917 reduced the spleen index, Salmonella loads, and inflammation (P < 0.05). It improved intestinal morphology and intestinal barrier function (P < 0.05). S. Enteritidis infection significantly reduced mRNA expression of angiotensin-converting enzyme 2 (ACE2) and solute carrier family 6-member 19 (SLC6A19) in the cecum and the content of Gly, Ser, Gln, and Trp in the serum (P < 0.05). Pretreatment with E. coli Nissle 1917 yielded mRNA expression of ACE2 and SLC6A19 in the cecum and levels of Gly, Ser, Gln, and Trp in the serum similar to that of uninfected chicks (P < 0.05). Additionally, E. coli Nissle 1917 altered cecum microbiota composition and enriched the abundance of E. coli, Lactobacillales, and Lachnospiraceae. These findings reveal that the probiotic E. coli Nissle 1917 reduced S. Enteritidis infection and shows enormous potential as an alternative to antibiotics.

生猪养殖中盲目使用抗生素,会导致猪粪中细菌产生抗生素抗性基因(ARGs).猪粪作为粪肥施用在农田后是否会促进ARGs向土壤、粮食和蔬菜等作物扩散和传播,长久以往是否会对人类和动物健康构成严重威胁.因此检索近期相关文献,综述猪粪中抗生素抗性基因和对种养循环的影响,以及降低ARGs的方法,以期降低猪粪中抗性基因水平,实现健康的种养循环模式.

辣椒碱(CAP)是辣椒中的一种生物碱(酰氨类),具有抗炎、抗菌、抗病毒、抗癌、抗氧化和促进肠道功能等作用,其在食品、医药等领域已有所应用.随着"饲料禁抗"时代来临,其在畜禽中的研究与应用也得到了广泛关注.本文综述了CAP的理化特性,以及生物学功能与作用机制,旨在为CAP在畜禽生产中应用提供理论参考依据.

中链脂肪酸(medium chain fatty acids,MCFA)是指碳原子数为6～12的一类脂肪酸,所有天然存在的脂肪酸均由C2单元(乙酰辅酶a)组成,因此碳原子数为偶数(如己酸C6、辛酸C8、癸酸C10、月桂酸C12).MCFA不仅可以作为能源物质,还具有抗菌、调节免疫、维护肠道健康、防治疾病以及提高动物生长性能等作用,因而也可作为替抗产品.文章对MCFA的生物学功能和作用机制进行了简述,概述其在畜禽生产方面的应用,旨为MCFA在养殖业中的进一步应用提供参考.

膳食纤维(DF)是母猪日粮中必不可少的营养素,能够提高母猪饱腹感,预防便秘,以及调节母猪肠道菌群.DF与母猪肠道菌群相互作用可以调节母猪繁殖性能、代谢功能,并影响仔猪的生长性能.文章综述了 DF对母猪肠道菌群多样性的影响,以及DF与肠道菌群相互作用对母猪肠道菌群、代谢、排卵、泌乳和子代生产性能等方面影响的研究进展,旨在为DF在母猪日粮中的应用与研究提供一种新的策略.

液体饲料是将干燥的饲料原料与水混合形成,或者是食品行业的液体副产品按一定比例混合而成.液体饲料在猪上使用较为受欢迎,特别是在欧洲的部分地区,与固态饲料相比,液体饲料可以降低饲料成本,提高猪的干物质采食量、生长速度和肠道健康.本文综述了液体饲料对肠道健康以及对不同生长阶段猪肠道菌群的影响,旨在为液体饲料在猪生产上应用提供一定基础理论.

Egg-laying rate is mainly determined by ovarian function and regulated by the hypothalamic-pituitary-gonadal axis; however, the mechanism by which the ovary regulates the egg-laying rate is still poorly understood. The purpose of this study was to compare the differences in the transcriptomes of the ovary of Lingyun black-bone chickens with relatively high and low egg-laying rates and screen candidate genes related to the egg-laying rate. RNA-sequencing (RNA-Seq) was conducted to explore the chicken transcriptome from the ovarian tissue of six Lingyun black-bone chickens with high (group G, n = 3) and low (group D, n = 3) egg-laying rates. The results showed that 235 differentially expressed genes (DEGs) were identified between the chickens with high and low egg-laying rates; among them, 209 DEGs were up-regulated and 26 DEGs were down-regulated. Gene Ontology analysis showed that the up-regulated 209 DEGs were enriched in 50 GO terms and the down-regulated 26 DEGs were enriched in 40 GO terms. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis showed that up-regulated DEGs were significantly enriched in 25 pathways and down-regulated DEGs were significantly enriched in three pathways. Among the pathways, we found the longevity regulating pathway-multiple species pathway, Estrogen signalling pathway and PPAR signalling pathway may have an essential function in regulating the egg-laying rate. The results highlighted DEGs in the ovarian tissues of relatively high and low laying Lingyun black-bone chicken and identified essential candidate genes related to the egg-laying rate, thereby providing a theoretical basis for improving the egg-laying rate of Lingyun black-bone chicken.

旨在克隆血管紧张素转换酶2(angiotensin converting enzyme 2,ACE2)基因,分析其结构特性和表达特征.本试验以45和90日龄的健康雪山草鸡为研究对象,利用PCR技术扩增ACE2基因的编码区序列;运用生物信息学方法对其结构特征进行分析;通过TA克隆构建黄羽肉鸡ACE2编码区序列质粒标准品,使用绝对定量方法测定ACE2基因在45和90日龄雪山草鸡公母鸡各组织中的表达特性.结果,克隆得到2 427 bp的编码区序列,共编码808个氨基酸,与白羽肉鸡一致,但是在黄羽肉鸡序列中存在大量突变位点造成编码氨基酸发生变化.同源性比较发现,其与红色原鸡的同源性为99％,其次为绿头鸭88％,与其它动物的同源性为73％～76％.生物信息学分析发现,ACE2属于Ⅰ型跨膜蛋白,即分泌型蛋白,信号肽位于1～17 aa,含有46个蛋白质磷酸化位点.定量结果发现,小肠中ACE2表达量显著高于其它组织.法氏囊、气管、胆囊和脾中ACE2表达量较低,脾中表达量最低.母鸡空肠、盲肠、脾和肺中ACE2基因表达量显著高于公鸡.公鸡肾和心中ACE2基因表达量显著高于母鸡.90日龄雪山草鸡的十二指肠、空肠、肺、脾和回肠组织ACE2基因表达量均显著低于45日龄雪山草鸡,在法氏囊和肾组织中结果呈相反趋势.通过克隆获得了雪山草鸡ACE2基因编码区序列,生物信息学分析发现,雪山草鸡ACE2基因在家禽中较为保守;ACE2基因表达规律呈现出在雪山草鸡肠道组织中高于其他组织,母鸡中高于公鸡,随着时间表达水平呈下降趋势.研究结果为开展ACE2基因在黄羽肉鸡肠道中的功能研究奠定了理论基础.

试验旨在通过探究硒与酪氨酸的添加水平对凌云乌鸡组织黑色素含量及其相关酶活性的影响,确定凌云乌鸡日粮中硒与酪氨酸的最适添加量,为利用营养元素调控凌云乌鸡药用价值提供参考依据.试验采用双因素交叉设计分组,日粮硒添加水平(0、0.2、0.3、0.4 mg/kg),酪氨酸添加水平(0、0.2％、0.4％、0.6％),选取13周龄体况良好、体重差异不显著的凌云乌鸡576只,随机分为16组,每组3个重复,每个重复12只鸡.基础日粮硒与酪氨酸含量为0.2 mg/kg和0.58％,饲养至20周龄末.试验结果表明:①日粮硒与酪氨酸水平对凌云乌鸡血清IgM无显著影响(P>0.05),第8组(0.2 mg/kg、0.2％)提高了血清中IgA的浓度(P<0.05),第10组(0.2 mg/kg、0.6％)使凌云乌鸡血清中IgG浓度提高(P<0.05).②日粮硒与酪氨酸水平对凌云乌鸡酶活性研究结果表明,血清中第11组(0.3 mg/kg、0.2％)的谷胱甘肽过氧化物酶(GSH-Px)活性最高(P<0.05),肌肉中第8组(0.2 mg/kg、0.2％)的GSH-Px活性最高(P<0.05),肝脏中第10组(0.2 mg/kg、0.6％)的GSH-Px活性最高(P<0.05),皮肤中第9组(0.2 mg/kg、0.4％)GSH-Px活性最高(P<0.05).血清中第15组(0.4 mg/kg、0.4％)的酪氨酸酶(TYR)活性最高(P<0.05);皮肤中第12组(0.3 mg/kg、0.4％)的TYR活性最高(P<0.05),硒与酪氨酸对血清、肝脏和皮肤中TYR活性存在互作效应(P<0.05).③对黑色素含量研究,肝脏中黑色素含量最高的组为第2组(0.2 mg/kg、0)(P<0.05),肌肉中为第5组(0 mg/kg、0.2％)黑色素含量最高(P<0.05),皮肤中为第9组(0.2 mg/kg、0.4％)黑色素含量最高(P<0.05),硒与酪氨酸对肌肉、肝脏和皮肤中黑色素的含量存在互作效应(P<0.05).综上所述:日粮中适当添加硒与酪氨酸能提高血清与组织中黑色素含量、GSH-Px活性及TYR活性,当日粮硒与酪氨酸的水平为0.4 mg/kg和0.98％时,可以实现凌云乌鸡最佳药用价值.

本试验旨在研究饲粮添加化香果单宁对肉鸡生长性能、屠宰性能、器官指数、肉品质、抗氧化功能和肠道发育的影响.选取1日龄雄性爱拔益加(AA)肉鸡288羽,随机分为4组,每组6个重复,每个重复12羽.对照组(PT0组)饲喂基础饲粮,试验组分别在基础饲粮中添加100(PT100组)、500(PT500)和1000 mg/kg(PT1000组)化香果单宁.试验期42 d.结果表明:1)PT100组1～21日龄肉鸡的平均日采食量(ADFI)显著低于PT0组(P<0.05),且ADFI与化香果单宁添加量呈显著二次相关(P<0.05).与PT0组相比,PT100组22～42日龄肉鸡的料重比有降低趋势(P=0.068).2)饲粮添加化香果单宁对肉鸡屠宰性能和肉品质无显著影响(P>0.05).3)PT1000组42日龄肉鸡肌胃指数显著低于其他各组(P<0.05),且肌胃指数与化香果单宁添加量呈显著二次相关(P<0.05).4)PT500和PT1000组42日龄肉鸡胸肌总超氧化物歧化酶(T-SOD)活性显著高于PT0组(P<0.05),且胸肌T-SOD活性与化香果单宁添加量呈显著线性相关(P<0.05).5)饲粮添加化香果单宁对肉鸡十二指肠和盲肠的校正长度和指数无显著影响(P<0.05).6)PT500组21日龄肉鸡空肠绒毛高度显著高于其他各组(P<0.05),且空肠绒毛高度与化香果单宁添加量呈显著线性相关(P<0.05);PT100、PT500和PT1000组42日龄肉鸡空肠绒毛高度显著高于PT0组(P<0.05),且空肠绒毛高度与化香果单宁添加量呈显著线性和二次相关(P<0.05).PT0和PT100组42日龄肉鸡回肠绒毛高度/隐窝深度(V/C)显著高于PT500组(P<0.05),且回肠V/C与化香果单宁添加量呈显著线性相关(P<0.05).由此可见,饲粮添加化香果单宁能够提高肉鸡抗氧化功能、空肠绒毛高度和回肠V/C,降低1～21日龄肉鸡ADFI,且具有降低22～42日龄肉鸡料重比的趋势.综合各项指标,化香果单宁在肉鸡饲粮中的推荐添加量为500 mg/kg.