绥芬河地区淡水鱼类体内汞含量的分布规律

为了研究绥芬河口岸食用淡水鱼体内汞含量的分布规律,试验采用原子荧光光度计和测汞仪检测对比,以市场随机抽取不同等级的鲤鱼、鲫鱼、鲢鱼及4个采样点的水质为对象,研究各个鱼种肝脏、肾脏、腮、肌肉等主要组织中的汞含量的浓度特征、分布及积累规律。结果表明:4个采样点的水质含汞量均未超过国家渔业水域水质标准(0.000 5 mg/L),不同区段鱼体中含汞量均可检出,检出率达100%。说明鱼体内各组织对汞的积累量与暴露水域浓度、鱼体年龄、种类等有关。     

青海湖裸鲤过氧化氢酶活性及电泳分析

为了比较青海湖裸鲤和鲤鱼过氧化氢酶(CAT)在不同组织中的活性,试验采用聚丙烯酰胺凝胶电泳法和钼酸铵比色法分析青海湖裸鲤和鲤鱼心脏、肝脏、鳃、肌肉中CAT的活性。结果表明:2种方法测定的CAT活性具有一致性,青海湖裸鲤不同组织中CAT活性依次为心脏鳃肝脏肌肉,鲤鱼不同组织中CAT活性依次为心脏肝脏鳃肌肉。青海湖裸鲤与鲤鱼CAT活性均存在明显的组织差异性,尤其是在肝脏和鳃中差异显著(P0.05)。     

西宁地区鲤鱼和草鱼组织乳酸脱氢酶的电泳分析

以西宁地区鲤鱼和草鱼为材料,采用垂直聚丙烯酰胺凝胶电泳技术,对肝脏、肾、心脏、鳃、脑、眼、肌肉等7种组织器官分别进行了乳酸脱氢酶(LDH)同工酶的分析比较。结果表明,不同组织中LDH的同工酶谱带是不同的,存在着组织特异性。鲤鱼的组织LDH共表现出LDHB4,LDHA282,LDHA4和LDHF4 4种主要同工酶,而草鱼则具有另外一种LDHE4同工酶。鲤鱼和草鱼同一组织器官的LDH的同工酶谱带也不尽相同,二者具有明显的种间分布特异性。     

高寒地区蓝鳃太阳鱼养殖技术

东北林业大学野生动物资源学院于洪贤等,对高寒地区蓝鳃太阳鱼的养殖技术进行了研究。取蓝鳃太阳鱼夏花25200尾,鲤鱼夏花～250g鱼种69400尾,鲫鱼鸟仔150000尾,鳙鱼550～1000g1450尾,鲢鱼150～500g 1550尾,团头鲂乌仔10000尾。2～30亩鱼池8个。实验采用单养(放入少     

酵母水解物对草鱼生长性能和体成分的影响

试验旨在研究酵母水解物(YHY)对草鱼幼鱼生长性能和体成分的影响。选用初始均质量(8.19±0.27)g的草鱼540尾,随机分成6个试验组,每组3个重复,每个重复30尾试验鱼,分别饲喂YHY添加水平为0、0.5%、0.9%、1.3%、1.7%和2.1%的6种等氮(蛋白质含量为30.00%)、等脂(7.00%)的草鱼饲料,养殖时间为60 d。结果表明:适量的YHY添加量能提高草鱼增重率(WGR)、特定生长率(SGR)、蛋白质效率(PER),降低草鱼饵料系数(FCR);以WGR、SGR、PER、FCR为指标,利用三次回归分析表明,草鱼生长性能最佳时YHY添加水平为1.53%~1.75%;YHY对鱼体粗灰分和水分影响不显著(P0.05),但显著提高肌肉中粗蛋白含量(P0.05),降低粗脂肪含量(P0.05),改善肌肉品质。综合考虑草鱼生长性能和体成分,草鱼幼鱼饲料中YHY适宜的添加水平为1.53%~1.75%。     

儿茶素对草鱼生长性能、血清抗氧化指标和肌肉品质的影响

本试验旨在研究儿茶素对草鱼生长性能、血清抗氧化指标和肌肉品质的影响。试验选取平均体质量为(18.5±0.2)g的草鱼360尾,随机分为6组,分别饲喂在基础饲料中添加0(对照组)、0.1、0.3、0.5、0.7和0.9 g/kg儿茶素的6种饲料,每组3个重复,每个重复20尾。试验期60 d。结果表明:1)随着儿茶素的添加,各组间鱼体增重率和饲料系数无显著差异(P>0.05),添加0.5、0.7和0.9 g/kg儿茶素显著提高了鱼体肥满度(P<0.05),显著降低了血清丙二醛含量(P<0.05)。除0.1 g/kg组外,其余各儿茶素添加组血清超氧化物歧化酶活性均显著高于对照组(P<0.05),各组间在血清碱性磷酸酶和过氧化氢脱氢酶活性上无显著差异(P>0.05)。2)在肌肉游离氨基酸和脂肪酸组成方面,0.5、0.7 g/kg组的总氨基酸、呈味氨基酸含量和C20∶5、n⁃3不饱和脂肪酸含量显著高于对照组(P<0.05)。3)各组间在肌肉水分、粗蛋白质、粗脂肪、粗灰分含量及肌肉质构特性、肌肉失水率以及肌纤维密度和直径上差异均不显著(P>0.05),但0.7和0.9 g/kg组的肌肉胶原蛋白含量显著高于对照组(P<0.05)。上述结果显示,儿茶素对草鱼生长性能没有显著影响,可提高血清抗氧化能力,在一定程度上改善肌肉品质。草鱼饲料中儿茶素的推荐添加量为0.5~0.7 g/kg。     

复合乳化剂对鲤鱼生长性能及代谢活性的影响

试验研究复合乳化剂对鲤鱼(Cyprinus carpio)幼鱼生长性能、肝脏脂肪代谢酶活性、肠道脂肪酶活性和血液生化指标的影响,初步探讨复合乳化剂在鲤鱼养殖中的应用效果。选用560尾初始体重为(76.55±0.95)g的鲤鱼幼鱼,随机分配分为4组,每组设4个重复,每个重复35尾鱼。分别投喂基础饲料(对照组)和添加0.1%(T1组)、0.2%(T2组)、0.5%(T3组)复合乳化剂的饲料。结果表明:与对照组相比,T1、T2组鲤鱼的增重率显著提高(P0.05),饲料系数显著降低(P0.05);T1组鲤鱼脏体比显著低于对照组(P0.05)。各试验组鱼的特定生长率、肝体比和肥满度均无显著性差异(P0.05)。与对照组相比,T1组显著提高鲤鱼肝脏和肠道脂肪酶活性(P0.05),T2组显著提高肝脏肝脂酶活性(P0.05)。与对照组相比,T1、T2组和T3组鲤鱼血清TG含量无显著差异(P0.05);T3组鲤鱼血清甘油三酯含量显著高于T1组和T2组(P0.05)。T1组和T3组鲤鱼肝脏TG含量显著低于对照组(P0.05),T2组鲤鱼肝脏TG显著高于对照组(P0.05)。T1、T2组和T3组鲤鱼血清低密度脂蛋白含量均显著高于对照组(P0.05);T1组鲤鱼血清高密度脂蛋白含量显著高于对照组(P0.05),T2组和T3组鲤鱼血清高密度脂蛋白含量与对照组无显著差异(P0.05)。各试验组鱼血清总胆固醇含量均无显著性差异(P0.05)。饲料中添加复合乳化剂对鲤鱼幼鱼的生长性能有显著影响,适量的复合乳化剂能提高肝脏和肠道脂肪酶及肝脏总酯酶活性,在一定程度上起到调节肝脏和血清脂质代谢的作用。     

低蛋白饲料对三龄草鱼生长、血清指标和肝脏抗氧化能力的影响

为探究低蛋白饲料对三龄草鱼生长、血清指标和肝脏抗氧化能力的影响。以基础配方(蛋白质水平30%)作为对照组(H1),面粉作为主要糖源,用面粉分别替代对照组(H1)饲料中的豆粕、菜粕、玉米蛋白粉及DDGS,配置三种等氮等能[粗蛋白(26.4±0.12)%,总能(15.53±0.15)MJ/kg]的低蛋白饲料,分别记作H2、H3、H4,投喂初始规格为(1 209±24.6)g/尾的三龄草鱼,网箱养殖120 d。结果表明:与对照组(H1)相比,低蛋白饲料对三龄草鱼的特定生长率、成活率、饲料系数、肝体指数、脏体指数、肠体指数、肥满度及鱼体肌肉成分等均无显著影响(P0.05),蛋白质效率显著升高(P0.05);其中面粉替代菜粕组(H2)肝脏粗脂肪含量有所升高(P0.05);投喂低蛋白饲料草鱼血清中总蛋白(TP)含量显著降低(P0.05),三酰甘油(TG)含量均存在不同程度降低,H3、H4达到显著水平(P0.05),而总胆固醇(CHO)和葡萄糖(GLU)含量无显著影响(P0.05)。各低蛋白组相比,面粉替代不同蛋白(豆粕、菜粕、玉米蛋白粉和DDGS)对草鱼血清的TP、TG、GLU影响不显著(P0.05)。低蛋白饲料对草鱼肝脏中的超氧化物歧化酶(T-SOD)、总抗氧化能力(T-AOC)、丙二醛(MDA)无显著影响(P0.05),面粉替代豆粕组(H3)过氧化氢酶(CAT)含量显著高于对照组(H1)(P0.05)。在本试验条件下,用面粉替代不同饲料蛋白,把饲料蛋白水平降低到26%时对三龄草鱼生长和饲料利用没有影响,但会降低血清中TP含量,H3肝脏的CAT含量升高,对肝脏抗氧化能力有一定胁迫作用。     

茶多酚对虹鳟生长性能、生化指标和非特异性免疫指标的影响

本试验研究了不同水平茶多酚对虹鳟生长、肉质、血浆生化指标和免疫指标的影响.选取2日龄初始体重(152.23±4.90)g的虹鳟560尾,随机分为6组,分别饲喂添加0、25、50、100、500、1 000 mg/kg茶多酚饲料,每组3个重复,每个重复30尾鱼,试验进行8周.结果显示:与对照组相比,添加不同水平的茶多酚对虹鳟增重率、特定生长率和饵料系数未产生显著的影响(P>0.05),但显著提高肝体比和脏体比(P<0.05).除茶多酚25 mg/kg组外其它试验组鱼体水分含量显著降低(P<0.05),茶多酚1 000 mg/kg组显著降低鱼体粗脂肪含量(P<0.05),茶多酚25 mg/kg组显著升高鱼体粗蛋白质含量(P<0.05).随着茶多酚添加量的增加,谷草转氨酶(GOT)逐渐下降,除25 mg/kg组外各试验组均显著低于对照组(P<0.05);谷丙转氨酶(GPT)、总胆固醇(CHO)、低密度脂蛋白(LDL)和高密度脂蛋白(HDL)差异不显著(P>0.05).随着茶多酚从25 mg/kg提高到100 mg/kg,肝脏和肌肉中的SOD活性升高,茶多酚25 mg/kg组肌肉SOD和50 mg/kg组肝脏SOD显著升高(P<0.05);肌肉和血浆中MDA下降,25、100 mg/kg组肌肉和50、100 mg/kg组血浆MDA显著(P<0.05或P<0.01)下降;茶多酚50 mg/kg组肝脏、鳃中AKP、ACP活性与对照组相比显著升高(P<0.05),但500和1 000 mg/kg组却未表现出明显的作用.以上结果表明:添加50～100 mg/kg茶多酚可改善虹鳟非特异性免疫和肌肉品质;但茶多酚超过500 mg/kg对虹鳟未产生有益作用.     

桑叶粉混合发酵饲料对草鱼健康性及鱼肉风味品质影响

比较桑叶粉混合发酵饲料(CL组)与常规饲料(CK组)对草鱼生长、生理、肉质的影响,结果表明:桑叶粉混合发酵饲料能有效改善草鱼肝脏健康,调节脂肪代谢,提高氧化能力,对草鱼抗应激、耐缺氧能力有较大的作用,从而促进草鱼生长。CL组草鱼全鱼脂肪含量显著低于CK组(P<0.05),但肌肉脂肪含量差异不显著,且CL组草鱼肌肉中的不饱和脂肪酸和风味氨基酸含量极显著高于CK组。桑叶粉混合发酵饲料养殖草鱼,不仅可以提高草鱼的健康性,还可以提高鱼肉营养成分和风味。     

白术、微米白术和白术多糖对断奶仔猪生长性能和肠道形态及微生态区系的影响

试验选用96头平均体重14.82 kg左右的杜×长×大断奶仔猪,随机分成4组,每组3栏,每栏8头(公母各半)。对照组饲喂基础日粮,试验1、2、3组分别添加1%80目白术、0.2%白术多糖和1%微米白术。试验期30 d。结果表明:在生长性能方面,与对照组相比,1%微米白术添加组可显著提高日增重(P0.05)、降低饲料增重比和腹泻率,而且效果优于1%80目白术组和0.2%白术多糖组,在肠道形态和肠道微生态区系方面,与对照组相比,日粮添加1%80目白术、0.2%白术多糖、1%微米白术均可不同程度的提高十二指肠和空肠的绒毛高度,加深十二指肠和空肠的隐窝深度,并且增加肠道微生态区系的多样性,其中以1%微米白术添加组的效果最佳。     

Prevalence and seasonal incidence of nematode parasites and fluke infections of sheep and goats in eastern Ethiopia

Sissay, M.M., Uggla, A. and Waller, P.J., XXXX. Prevalence and seasonal incidence of nematode parasites and fluke infections of sheep and goats in eastern Ethiopia. Tropical Animal Health and Production, XXXX. A 2-year abattoir survey was carried out to determine the prevalence, abundance and seasonal incidence of gastro-intestinal (GI) nematodes and trematodes (flukes) of sheep and goats in the semi-arid zone of eastern Ethiopia. During May 2003 to April 2005, viscera including liver, lungs and GI tracts were collected from 655 sheep and 632 goats slaughtered at 4 abattoirs located in the towns of Haramaya, Harar, Dire Dawa and Jijiga in eastern Ethiopia. All animals were raised in the farming areas located within the community boundaries for each town. Collected materials were transported within 24 h to the parasitology laboratory of Haramaya University for immediate processing. Thirteen species belonging to 9 genera of GI nematodes (Haemonchus contortus, Trichostrongylus axei, T. colubriformis, T. vitrinus, Nematodirus filicollis, N. spathiger, Oesophagostomum columbianum, O. venulosum, Strongyloides papillosus, Bunostomum trigonocephalum, Trichuris ovis, Cooperia curticei and Chabertia ovina), and 4 species belonging to 3 genera of trematodes (Fasciola hepatica, F. gigantica, Paramphistomum {Calicohoron} microbothrium and Dicrocoelium dendriticum) were recorded in both sheep and goats. All animals in this investigation were infected with multiple species to varying degrees. The mean burdens of adult nematodes were generally moderate in both sheep and goats and showed patterns of seasonal abundance that corresponded with the bi-modal annual rainfall pattern, with highest burdens around the middle of the rainy season. In both sheep and goats there were significant differences in the mean worm burdens and abundance of the different nematode species between the four geographic locations, with worm burdens in the Haramaya and Harar areas greater than those observed in the Dire Dawa and Jijiga locations. Similar seasonal variations were also observed in the prevalence of flukes. But there were no significant differences in the prevalence of each fluke species between the four locations. Overall, the results showed that Haemonchus, Trichostrongylus, Nematodirus, Oesophagostomum, Fasciola and Paramphistomum species were the most abundant helminth parasites of sheep and goats in eastern Ethiopia.     

Phase I evaluation of CCNU (lomustine) in tumor-bearing cats

1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks.     

Furosemide continuous rate infusion in the horse: evaluation of enhanced efficacy and reduced side effects

Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses.     

Y‐chromosomal variation of local goat breeds of Turkey close to the domestication centre

Genetic variations in chromosome Y are enabling researchers to identify paternal lineages, which are informative for introgressions and migrations. In this study, the male‐specific region markers, sex‐determining region‐Y (SRY), amelogenin (AMELY) and zinc finger (ZFY) were analysed in seven Turkish native goat breeds, Angora, Kilis, Hair, Honaml?, Norduz, Gürcü and Abaza. A SNP in the ZFY gene defined a new haplotype Y2C. All domestic haplogroups originate from Capra aegagrus, while the finding of Y1A, Y1B, Y2A and Y2C in 32, 4, 126 and 2 Turkish domestic goats, respectively, appears to indicate a predomestic origin of the major haplotypes. The occurrence of four haplotypes in the Hair goat and, in contrast, a frequency of 96% of Y1A in the Kilis breed illustrate that Y‐chromosomal variants have a more breed‐dependent distribution than mitochondrial or autosomal DNA. This probably reflects male founder effects, but a role in adaptation cannot be excluded.     

The Epidemiology of Gastrointestinal Nematodes of Dairy Cattle in Central Kenya

The epidemiology of H. placei and of other gastrointestinal nematodes in yearling dairy cattle was examined on two farms in Kiambu District, central Kenya during each of 13 one-month periods from April 1993 to April 1994. On each farm, 32 newly weaned dairy calves were given a single dose of albendazole and then placed on experimental pastures. Twelve of the animals were designated for bi-monthly slaughter (n = 2) and analysis of worm population characteristics and 20 were designated for blood and faecal collection and for weighing. Two parasite-free tracer calves were grazed alongside the weaner calves each month throughout the study period and were also slaughtered for analysis of worm populations. Faecal egg counts, haematological and serum pepsinogen determinations, herbage larval counts, and animal live weight changes were recorded monthly. The study revealed that Haemonchus placei, Trichostrongylus axei, Cooperia spp. and Oesophagostomum radiatum were responsible for parasitic gastroenteritis and that H. placei was the predominant nematode present in the young cattle on both farms. Faecal egg counts from resident cattle and necropsy worm counts revealed that pasture larval levels were directly related to the amount of rainfall. The total worm burdens in the animals were highest during the rainy season (March–June and October–December) and lowest during the dry seasons (July–September and January–February). The very low recovery of immature larvae of H. placei from the tracer calves indicated that arrested development is not a feature of the life cycle of this parasite in central Kenya. The maintenance of the parasite population depended on continuous cycling of infection between the host and the pasture. The agroclimatic conditions of the study area were such that, in general, favourable weather conditions for the development and survival of the free-living stages of gastrointestinal nematodes existed all year round.     

Diversity of Ectoparasites in Sheep Flocks in Sa~o Paulo,Brazil

The occurrence of ectoparasites in sheep flocks is frequently reported but seldom quantified. Sheep production used to be a predominantly family activity in the state of Sa~o Paulo (Brazil), but it began to become a commercial activity in the past decade. Thus, information about the ectoparasites existing in sheep flocks has become necessary. The present data were obtained by means of questionnaires sent to all sheep breeders belonging to the `Associaça~o Paulista de Criadores de Ovinos' (ASPACO; Sa~o Paulo State Association of Sheep Breeders). Response reliability was tested by means of random visits paid to 10.6% of the respondents. Most of the properties (89.5%) reported the presence of one or more ectoparasites. Screw-worm (Cochliomyia hominivorax) was the most frequent ectoparasite (72.5%), followed by bot fly larvae (Dermatobia hominis, 45.0%), ticks (Amblyomma cajennense) and Boophilus microplus, 31.3%) and finally lice (Damalinia ovis, 13.8%). Combined infestations also occurred, the most common one being screw-worm with bot fly larvae (36.0%) followed by bot fly larvae with ticks (13.9%), screw-worm with ticks (9.3%), bot fly larvae with lice (6.9%), and ticks with lice (5.0%). The most common triple combination was screw-worm, bot fly larvae and ticks (12.8%). Breeds raised for meat or wool were attacked by bot fly larvae and ticks more often than other breeds. Lice were only absent from animals of indigenous breeds. The relationships among these ectoparasites are discussed in terms of sheep breeds, flock size, seasonality and the ectoparasitic combinations on the host.     

Feline intracranial neoplasia: retrospective review of 160 cases (1985-2001)

The purpose of this study was to determine the frequency of different tumor types within a large cohort of cats with intracranial neoplasia and to attempt to correlate signalment, tumor size and location, and survival time for each tumor. Medical records of 160 cats with confirmed intracranial neoplasia evaluated between 1985 and 2001 were reviewed. Parameters evaluated included age, sex, breed, FeLV/FIV status, clinical signs, duration of signs, number of tumors, tumor location(s), imaging results, treatment, survival times, and histopathologic diagnosis. Most of the cats were older (11.3 +/- 3.8 years). Primary tumors accounted for 70.6% of cases. Metastasis and direct extension of secondary tumors accounted for only 5.6 and 3.8% of cases, respectively. Twelve cats (7.5%) had 2 or more discrete tumors of the same type, whereas 16 cats (10.0%) had 2 different types of intracranial tumors. The most common tumor types were meningioma (n = 93, 58.1%), lymphoma (n = 23, 14.4%), pituitary tumors (n = 14, 8.8%), and gliomas (n = 12, 7.5%). The most common neurological signs were altered consciousness (n = 42, 26.2%), circling (n = 36, 22.5%), and seizures (n = 36, 22.5%). Cats without specific neurological signs were common (n = 34, 21.2%). The tumor was considered an incidental finding in 30 (18.8%) cats. In addition to expected relationships (eg, meninges and meningioma, pituitary and pituitary tumors), we found that lesion location was predictive of tumor type with diffuse cerebral or brainstem involvement predictive of lymphoma and third ventricle involvement predictive of meningioma.     

Evaluation of biohydrogenation rate of canola vs. soya bean seeds as unsaturated fatty acids sources for ruminants in situ

An experiment was conducted to study disappearance of C14 to C18 fatty acids, lag times and biohydrogenation (BH) rates of C18 fatty acids of ground soya bean and canola seeds in situ. Three ruminally fistulated Dallagh sheep were used to determine ruminal BH of unsaturated fatty acids (UFAs). Differences in the disappearance of fatty acids through the bags and lag times were observed between the oilseeds. We saw that the longer the incubation time of the oilseeds in the rumen, the lower the content of C18:2 and C18:3. Significantly higher lag times for both C18:2 and C18:3 were observed in ground canola compared to ground soya bean. BH rates of C18:2 and C18:3 fatty acids in soya bean were three times higher than those of canola. These results suggest that the fatty acid profile of fat source can affect the BH of UFAs by rumen micro‐organisms. So that UFAs of canola had higher ability to escape from ruminal BH. It seems that fatty acid profile of ruminant products is more affected by canola seed compared to soya bean seed.