Comparison of active dry yeast (Saccharomyces cerevisiae) and yeast culture for growth performance,carcass traits,meat quality and blood indexes in finishing bulls

This study was conducted to compare the effect of active dry yeasts (ADY) and yeast cultures (YC), two typical products of yeast preparations, on growth performance, carcass characteristics, meat quality and blood indexes in finishing bulls fed a high‐concentrate diet. Forty‐five finishing bulls (mean body weight (BW) ± standard deviation: 505 ± 29 kg BW) were allocated to three groups of 15 bulls and assigned randomly to one of three diets which were CON diet (basal diet), ADY diet (basal diet + Levucell SC) and YC diet (basal diet + Diamond V XP), respectively. After 98 days of trial, all bulls were slaughtered. The result showed that ADY rather than YC improved growth performance and carcass traits of bulls compared to CON. Moreover, both ADY and YC improved beef tenderness and changed blood indexes related to fat metabolism. In conclusion, ADY had more pronounced effect on growth performance of bulls fed high‐concentrate diet, and both ADY and YC improved the beef quality by intensive fat metabolism.     

营养调控剂对荷斯坦奶公牛育肥性能的影响

为了探讨2种营养调控剂对荷斯坦奶公牛育肥性能和屠宰性能的影响,按体重和月龄相近原则选择60头荷斯坦奶公牛,并随机分成3组,对照组饲喂基础日粮,试验1、2组分别在基础日粮中添加100 g/d调控剂Ⅰ和Ⅱ,预试期14 d,正试期31 d。结果表明,试验1、2组每头牛的日增重分别比对照组提高0.32和0.37 kg(P<0.05);与对照组相比,试验2组能显著提高胴体产肉率、肉骨比和十三块分割肉重(P<0.05),试验1、2组的屠宰率、净肉率和十三块分割肉占净肉重比例分别提高了2.96%、3.05%、1.47%和1.89%、2.82%、2.39%,但差异均不显著(P>0.05);在试验期内,试验1、2组比对照组分别多增加利润1233.80和1370.20元。结果提示,2种营养调控剂均对荷斯坦奶公牛的育肥效果较好,可以产生较好的经济效益。     

饲粮中添加过瘤胃蛋氨酸、过瘤胃赖氨酸对荷斯坦奶公牛肉用生产性能和肉品质的影响

本试验旨在研究在饲粮中添加过瘤胃蛋氨酸(RPMet)、过瘤胃赖氨酸(RPLys)对荷斯坦奶公牛肉用生产性能和肉品质的影响。采用完全随机试验设计,选择25头12月龄左右、体重相近的健康荷斯坦奶公牛,随机分为5组,每组5个重复,每个重复1头。对照组饲喂基础饲粮(牧场实用饲粮);其余4个试验组分别在基础饲粮中添加RPMet 15 g/d(RPM组)、RPLys30 g/d(RPL组)、RPLys 30 g/d+RPM et 15 g/d(RPL+M组)和RPLys 30 g/d+RPM et 15 g/d(同时基础饲粮粗蛋白质水平降低1.71%)[RPL+M(L)组]。预试期10 d,正试期150 d。结果表明:1)RPL+M组和RPL+M(L)组试验牛末重、平均日增重均显著高于对照组(P0.05),料重比显著低于对照组(P0.05),但这2组间差异不显著(P0.05);RPL+M(L)组养殖效益最高,为7.67元/(d·头),且高出RPL+M组0.32元/(d·头)。2)与对照组相比,饲粮中添加RPM et、RPLys对荷斯坦奶公牛净肉率无显著影响(P0.05);RPM组、RPL组、RPL+M组和RPL+M(L)组宰前活重显著增加(P0.05),且以RPL+M组最高,但RPL+M组与RPL+M(L)组无显著差异(P0.05);RPL组屠宰率显著升高(P0.05);各试验组胴体产肉率和肉骨比均显著增加(P0.05),但试验组间差异不显著(P0.05)。3)饲粮中添加RPMet、RPLys对眼肌面积、剪切力、熟肉率、大理石花纹等级、p H和肉色等级均无显著影响(P0.05)。4)饲粮中添加RPMet、RPLys对肌肉脂肪酸组成亦无显著影响(P0.05)。综上所述,在饲粮中添加RPM et、RPLys可保持奶公牛同等的肉品质和肌肉脂肪酸含量,并在一定程度上提高奶公牛肉用生产性能;且添加RPMet和RPLys可替代部分蛋白质饲料,增加养殖效益。     

添加溢康素对肉用鹌鹑效果实验

选用1日龄肉用鹌鹑80羽,随机分为对照组(基础日粮)和试验组(基础日粮添加0.1％溢康素),研究日粮添加溢康素(寡聚糖)对肉用鹌鹑生产性能、抗腹泻、及血清胆固醇含量的影响。结果表明:试验组鹌鹑的日增重提高,料肉比降低(P<0.05),腹泻率降低(P<0.05),血清总胆固醇和肉中胆固醇含量分别降低了12.5(P<0.05)和1.9％。试验结果表明,寡聚糖对肉用鹌鹑的生产性能有促进作用,降低腹泻率,降低血清胆固醇含量和肉中胆固醇的含量。     

杂交狼尾草青贮饲喂肉猪效果研究

本试验旨在研究利用酶制剂青贮杂交狼尾草,对牧草品质和肉猪饲喂效果的影响。选用150头100日龄体重50kg杜长大三元肉猪。实验分5个处理,每个处理3次重复,每个重复10头。对照组(CK)饲喂基础日粮;处理Ⅰ饲喂基础日粮,同时饲喂添加麦麸的杂交狼尾草青贮料;处理Ⅱ饲喂基础日粮,同时饲喂添加麦麸和纤维素酶青贮的杂交狼尾草青贮料;处理Ⅲ饲喂基础日粮,同时饲喂添加麦麸和纤维素菌液青贮的杂交狼尾草青贮料;处理Ⅳ饲喂基础日粮,同时饲喂添加麦麸和乳酸菌青贮的杂交狼尾草青贮料。结果表明,处理Ⅰ、Ⅱ、Ⅲ、Ⅳ与CK相比平均日增重差异不显著(P0.05),但平均日增重绝对值分别比CK提高了2.3%,8.6%,4.4%和2.2%,精料肉比分别降低了9.7%,14.9%,11.4%和9.5%,经济效益分别提高了11.34%,36.03%,21.60%和14.03%。4组饲喂杂交狼尾草青贮料的肉猪与CK相比会适当降低肉猪屠宰率,显著提高肉猪的背膘厚,肉猪的板油重、胃重呈增加的趋势,大肠重量差异不显著,小肠重量和长度则变短变轻,且增加肉质颜色等品质。说明利用纤维素降解菌可以提高牧草青贮品质,提高肉猪饲喂效果和经济效益。     

Longissimus muscle quality, palatability and connective tissue histological characteristics of bulls and steers fed different energy levels and slaughtered at four ages

One hundred forty-four Angus male calves were assigned to one of five slaughter-age groups: 9, 12, 15, 18 and 24 mo of age. After weaning, one-half of the calves within slaughter age were castrated. One-half of the 12-, 15-, 18- and 24-mo age groups of each sex were further randomly allotted to a high-energy (HE) or low-energy (LE) finishing diet. Eight bulls and eight steers assigned to the 9-mo slaughter group were fed the HE diet only. Samples from the longissimus muscle (LM) were taken at the 12th rib for histological evaluations of fat deposits. Thin sections from the LM at the 11th rib were stained for lipid, collagen and elastin. Steaks from the LM were cooked and evaluated by a sensory panel and sheared by a Warner-Bratzler shear (WBS) device. The 9-10-11th rib sections were separated into muscle, fat and bone. Collagen, elastin and collagen solubility were determined chemically. Bulls had heavier carcasses, less fat and lower sensory scores for tenderness and juiciness than steers. Steers fed the HE diet had lower WBS values than bulls on either diet. Cooking losses were higher for bulls at 12, 18 and 24 mo than for steers. Histological evaluation showed that collagen content was higher for bulls than for steers and higher for cattle fed the LE diet than those fed the HE diet. Among cattle on the HE diet, the 9-mo cattle had more collagen than all older groups. Neither sex nor diet had an effect on elastin content shown by histological evaluation, but 12-mo cattle had the most elastin and the 15- and 18-mo cattle had the least elastin. Collagen content determined by chemical analysis was not affected by sex, diet or slaughter age. Correlation coefficients among histologically and chemically evaluated collagen and elastin and meat traits were too low to be of practical importance. The time-intensive histological techniques used in our study provided little additional information over that obtained from visually evaluated or chemically measured meat traits.     

Foreign substances in the meat and organs of bulls fed on a diet of swine and poultry fecal waste

The meat and some organs of eight bulls given diet with 5% to 15% supplements of dried pig and poultry excrements for 175 days were subjected to examination for the presence of some foreign substances. The results were compared with samples from eight control bulls, fed the basal diet. Liver was not found to contain any aflatoxins B1 and M1. No statistically significant differences were found in the content of antimicrobial substances. The same can be said of the content of chlorinated pesticides. Residues of organo-phosphorus pesticides were not detected at all. As to chemical elements, the test bulls were found to have a significantly increased content of copper in liver and diaphragm. All the findings of the residues of foreign substances were within limits tolerated by veterinary regulations.     

姜黄素替代育肥猪饲粮中喹烯酮对抗体合成和猪肉品质的影响

试验研究了姜黄素替代猪饲粮中抗菌药物喹烯酮对抗体的合成和猪肉品质的影响。选取64头体重约70 kg的杜×长×大三元杂交猪,将其分为4组,每组16头猪。在基础饲粮中添加50 mg/kg喹烯酮后,饲喂第1组(对照组)猪;在基础饲粮中分别添加200、3004、00 mg/kg姜黄素后,相应地饲喂第23、4、组猪,饲养试验期40 d。试验结果表明:姜黄素替代育肥猪饲粮中喹烯酮,对猪体健康无不良影响;能改善猪的肉品质量;不同程度地提高猪的病原抗体效价。育肥猪饲粮中姜黄素的适宜添加量为400 mg/kg。     

壳聚糖对肉鹅屠宰性能及肉品质的影响

为研究壳聚糖对肉鹅屠宰性能及肉品质的影响,选28日龄健康肉鹅120只,随机分成4组,每组5个重复,每个重复6只。对照组饲喂基础日粮,试验组分别饲喂基础日粮中添加0.05%、0.10%、0.15%壳聚糖的试验组日粮,试验期42d。结果表明:肉仔鹅日粮中添加0.05%~0.15%的壳聚糖可明显降低屠体脂肪含量,但对其它屠宰性能没有明显影响;鹅肉的pH和嫩度、干物质、氨基酸及总还原糖没有明显变化,但蛋白含量有所增加,脂肪含量有所下降,肌苷酸明显增加,从而改善鹅肉的风味。     

The effects of dietary crude protein level on rate, efficiency and composition of gain of growing beef bulls

Two experiments were conducted to evaluate the effects of dietary CP level on rate, efficiency and composition of gain of growing beef bulls. In Exp. 1, 59 bulls (333 +/- 15.8 kg) were used. Eleven bulls were slaughtered on d 0 to provide an estimate of initial carcass composition (9-10-11 rib section chemical analyses), and remaining bulls were assigned to treatment diets containing 10, 12 or 14% dietary CP. Bulls fed the 10% CP diet grew slower (P less than .05) than bulls fed the 12 or 14% CP diets, although dry matter intake and feed-to-gain ratio did not differ. Bulls fed the 12% CP diet had fatter carcasses (P less than .05) than bulls fed the 10 or 14% CP diets and had greater daily fat accretion than bulls fed the 10% CP diet. In Exp. 2, 60 bulls (318 +/- 9.0 kg) were used. Bulls were assigned to initial slaughter (n = 6) or to one of three dietary treatments, 10, 12 or 14% CP, and were slaughtered after feeding for 66, 136 or 202 d (n = 6 . treatment -1 . slaughter time -1). Bulls fed 10% CP diets had lower (P less than .05) rates of carcass protein accretion during d 0 to 136 and d 0 to 202. Carcass fat gain was similar among treatments over the entire experiment, although bulls fed the 14% CP diet gained more fat during d 0 to 136 than bulls fed the other treatments.(ABSTRACT TRUNCATED AT 250 WORDS)     

多营养源饲粮对生长育肥猪生长性能、养分表观消化率及肉品质的影响

本试验旨在研究多营养源饲粮对生长育肥猪生长性能、养分表观消化率及肉品质的影响,探索使用非常规饲料原料配制饲粮的可能性。试验选取日龄相近、体重在(41.06±1.43)kg的"杜长大"生长猪48头,随机分配到2个组,分别饲喂玉米-豆粕型基础饲粮(对照组)和多营养源饲粮(试验组),每组12个重复,每个重复2头猪。生长阶段试验期为42 d,育肥阶段待猪体重达120 kg时,每个组选择5头猪进行屠宰并测定肉品质。结果表明:1)与对照组相比,试验组试验猪平均日采食量提高了7.76%(P0.05),平均日增重、料重比和能量摄入量均无显著差异(P0.05);2)与对照组相比,试验组钙、磷、能量、粗蛋白质、粗灰分和干物质的表观消化率显著降低(P0.05),粗脂肪的表观消化率无显著差异(P0.05);3)与对照组相比,饲喂多营养源饲粮显著提高了试验猪血清谷丙转氨酶的活性(P0.05),但对其余血清生化指标均无显著影响(P0.05);4)与对照组相比,饲喂多营养源饲粮对猪肉品质及背最长肌肌内脂肪和蛋白质含量无显著影响(P0.05)。由此可知:在本试验条件下,饲喂以非常规饲料原料为主的多营养源饲粮降低了生长育肥猪营养物质表观消化率,但对其生长性能和肉品质无负面影响。     

饲料中添加果寡糖对鹌鹑生产性能与胆固醇含量的影响

选用1日龄肉用鹌鹑80羽,随机分为对照组(基础日粮)和试验组(基础日粮添加0.1%果寡糖),研究日粮添加果寡糖对肉用鹌鹑生产性能、抗腹泻及血清胆固醇含量的影响。结果表明:试验组鹌鹑的日增重提高,料肉比降低(P0.05),腹泻率降低(P0.05),血清总胆固醇和肉中胆固醇含量分别降低了12.5%(P0.05)和1.9%。说明果寡糖对肉用鹌鹑的生产性能有促进作用,降低肉用鹌鹑腹泻率、血清胆固醇含量和肉中胆固醇的含量。     

不同能量和蛋白质水平饲粮对宁乡猪生长性能、胴体品质和肉品质的影响

本试验旨在研究不同能量和蛋白质水平饲粮对宁乡猪生长性能、胴体品质及肉品质的影响.选用体重约18 kg的宁乡猪仔猪72头,随机分为3组(每组4个重复,每个重复6头):对照组饲喂基础饲粮(前、中、后3期蛋白质水平分别为14.03％、12.06％、11.01％;全期消化能为12.15 MJ/kg);试验A组饲喂在基础饲粮的基...     

Lack of interrelationship between the effects of dietary factors and food withdrawal on carcase quality of broiler chickens

1. Four factorial experiments were carried out to determine whether there is any interrelationship between dietary energy-to-protein (E:P) ratio (experiments 1, 2 and 3) or pelleting the diet (experiment 4) and the duration of food withdrawal (FW), in their effect on carcase quality of broiler male chickens. The quality was evaluated by yields of carcase and breast meat, abdominal fat pad size, and the content and composition of the fat in the meat. The effect of sex on the response to FW was also determined in experiment 3 and that of age in experiment 4. 2. The diet with an E:P ratio higher than recommended decreased the weights of carcase and breast meat significantly (P 0.05) in 2 of the 3 experiments, and consistently increased the size of the abdominal fat pad and the fat content in thigh, but not in breast meat. Abdominal fat pad and the fat in meat of birds fed on this diet contained a significantly higher amount of oleic acid and a lower amount of linoleic acid, than the fat of birds fed on the diets with the recommended and the low E:P ratios. The pellets increased significantly the weights of carcase and breast meat and the relative size of abdominal fat pad. 3. FW for 24 h decreased significantly the weight at slaughter in all 4 experiments, carcase weight in 3 experiments, and breast weight in 1 experiment. However, it did not affect the relative size of the abdominal fat pad, the fat content in thigh and breast meat, and the composition of fatty acids in these tissues and in abdominal fat. None of the variables mentioned was affected significantly by the interaction between the dietary factors evaluated, sex or age of the birds on the one hand, and FW on the other hand. 4. It is concluded that the effect of 24 h of FW on weight at slaughter, carcase and breast meat weights and on fattening, is not affected by dietary E:P ratio, pelleting the diet, or sex and age of the broilers.     

复合胶原蛋白粉对肉仔鸡生长性能及肉品质的影响

选用1日龄艾维茵肉仔鸡180只,随机分为3组,对照组,饲喂不含复合胶原蛋白粉的日粮,试验1用复合胶原蛋白粉替代日粮中一半豆粕,试验2用复合胶原蛋白粉替代日粮中全部豆粕。分析测定试验的生长发育指标屠宰指标及肉质指标结果,与对照组相比一半替代组,肉仔鸡末重、日增重、日采食量分别提高15.74%（P〈0.01）、2.59%（P〉0.05）、13.90%（P〈0.01）,全部替代组三指标有所降低,但差异不显著（P〉0.05）;实验组屠宰率、全净膛率、胸肌率、腿肌率均以一半替代组为最高;腹脂率以一半替代组为最低其它指标差异不显著;各试验组胸肌及腿肌差异均不显著（P〉0.05）;除全部替代组胸肌中蛋白含量比对照组相提高了4.24%（P〈0.05）除外,其它各指标在各组间均无显著差异（P〉0.05）。表明用复合胶原蛋白粉替代肉仔鸡日粮中一半豆粕可以提高科技转化率和生长性能。     

Impact of restricting feed and probiotic supplementation on growth performance,mortality and carcass traits of meat‐type quails

The objective of this study was to evaluate the effects of quantitative feed restriction, along with dietary supplementation with a probiotic blend (Protexin) as a natural growth promoter, on the performance, water consumption, mortality rate and carcass traits of meat‐type quails. A total of 250 1‐day unsexed quails were randomly allocated to five equal groups in a completely randomized design. The first group (A) fed a basal diet without any restriction (24 hr/day); the second group (B1) fed the basal diet for 20 hr/day; the third group (B2) fed the basal diet enriched with probiotic (0.1 g/kg diet) for 20 hr/day; the fourth group (C1) fed the basal diet for 16 hr/day; and the fifth group (C2) fed the basal diet enriched with probiotic (0.1 g/kg diet) for 16 hr/day. Birds were fed ad‐libitum from 0–14 days of age, and then the feed restriction regimes started from 14 till 28 days of age. Results showed that quails in the control‐group consumed more feed and water than the other treatment groups (p < .01), however their body weights did not differ (p > .05) compared with the other treated groups. The best feed conversion values were achieved in quails supplemented with probiotic blend (B2 and C2) in comparison with the other groups (p < .01). Feeding probiotic had a positive effect on bird health which reduced the mortality rate. Further, mortality rate was significantly reduced (p < .05) by feed restriction, with or without probiotic supplementation. No carcass parameters were significantly affected (p > .05) by treatments. Our results show that quail could be reared under a feed restriction system, for 4–8 hr daily, along with dietary supplementation of probiotic as growth promoter for better growth performance.     

德氏乳杆菌对宁乡猪生产性能、胴体性状及肉品质的影响

本试验旨在研究德氏乳杆菌对宁乡猪生产性能、胴体性状及肉品质的影响。选用48头(33.28±1.15)kg的宁乡猪,随机分为2组,每组4个重复栏,每个重复栏6头,对照组饲喂无抗基础饲粮,试验组饲喂在基础饲粮中添加0.2%德氏乳杆菌制剂的试验饲粮。试验猪分2个阶段饲喂,分别为30~70 kg和71~100 kg。试验期120 d。结果显示:生产性能方面,与对照组相比,2个阶段中试验组猪的末重和平均日增重略有升高,料重比略有降低,但变化均不显著(P0.05);胴体性状方面,添加德氏乳杆菌制剂后略有改善,但2组各指标间差异均不显著(P0.05);肉品质方面,与对照组相比,试验组猪宰后45 min的黄度值显著降低(P0.05),宰后24 h的亮度值和失水率显著降低(P0.05),其他各项指标差异不显著(P0.05)。由此得知,饲粮中添加0.2%德氏乳杆菌制剂能够改善宁乡猪生产性能、胴体性状和肉品质。     

Effect of dietary Rhodobacter capsulatus on cholesterol, triglycerides concentration, and meat quality of finishing pigs

The study was designed to investigate the effect of Rhodobacter capsulatus on serum and meat cholesterol, fatty acid composition in meat, as well as meat quality of finishing pigs. A total of 16 120-day-old Landrace female pigs of about 60 kg initial body weight were randomly assigned into two groups. The pigs were fed a supplemented diet with 0.04% dietary R. capsulatus or a control diet for 60 days. Total cholesterol and low density lipoprotein-cholesterol concentration in serum was significantly lowered ( P  < 0.05) in the pigs fed the R. capsulatus supplemented diet compared to the control diet. Carcass weight, carcass length, shoulder fat, back fat and loin fat thickness, longissimus muscle (LM) area, and color score did not differ significantly between the pigs fed the R. capsulatus supplemented diet and control diet. Among the nutrient composition of LM meat, neutral fat and triglyceride concentration were significantly ( P  < 0.05) reduced in the finishing pigs by dietary supplementation of R. capsulatus . The proportions of n-6 PUFA were higher ( P  < 0.05) in the pigs fed the R. capsulatus supplemented diet than in the pigs fed the control diet. The supplementation of dietary R. capsulatus to finishing pig diet played important roles in reducing serum cholesterol and meat triglycerides, as well as in increasing polyunsaturated fatty acid content in LM meat.     

Evaluation of various extracted vegetable oils, roasted soybeans, medium-chain triglyceride and an animal-vegetable fat blend for postweaning swine

A total of 280 crossbred pigs weaned at 21 d of age and weighing approximately 6 kg were utilized in five replicates to evaluate pig growth responses when fed a basal diet or one of several dietary lipid sources during a 4-wk postweaning period. A basal corn-soybean meal-corn starch-dried whey diet was compared with diets supplemented at a 7.75% level with one of the following lipid sources: corn oil, coconut oil, soybean oil, medium-chain triglyceride (MCT) or an animal-vegetable blend. A sixth treatment evaluated a roasted soybean diet formulated to an energy:lysine level equivalent to that of the fat-supplemented diets. In Exp. II, 36 crossbred weanling barrows were used to determine apparent fat and N digestibilities when soybean oil, roasted soybean, coconut oil or the MCT-supplemented diets were fed. Although pigs fed coconut oil grew somewhat faster, fat inclusion generally did not increase pig growth rate or result in lowered feed intake during the initial weeks postweaning; during the latter portion of the starter phase the addition of dietary fat resulted in a higher growth rate but feed intake was unaffected, resulting in an overall improvement in feed-to-gain ratio (P less than .05) for all but the roasted soybean diet. Pigs fed coconut oil had higher serum triglyceride and lower serum urea concentrations than did pigs fed diets containing most other lipid sources. Pigs fed MCT and coconut oil diets had a higher (P less than .01) apparent fat digestibility during the initial 2 wk postweaning than pigs fed soybean oil or roasted soybean diets. Pigs fed MCT and roasted soybeans had poorest growth rates; apparent fat and N digestibilities were lowest (P less than .05) for the roasted soybean diet.     

热应激条件下脂肪来源对肉兔生产性能、养分消化率及血清脂质代谢和抗氧化指标的影响

本试验旨在研究热应激条件下脂肪来源对肉兔生产性能、养分消化率及血清脂质代谢和抗氧化指标的影响。试验选择30日龄的断奶新西兰兔600只,随机分成5个组,每个组6个重复,每个重复20只。对照组饲喂基础饲粮,各脂肪添加组分别饲喂含2%牛油、猪油、玉米油、豆油的饲粮。试验兔均饲养在热应激兔舍(温湿指数为29.5±0.5)中。试验期7周。结果表明:与对照组相比,热应激条件下饲粮中添加不同来源的脂肪均可以显著提高肉兔的平均日增重(P0.05),显著降低料重比(P0.05),其中以玉米油的效果最佳。与对照组相比,热应激条件下饲粮中添加不同来源的脂肪均可以显著提高肉兔的干物质和粗蛋白质消化率(P0.05),显著降低粗脂肪消化率(P0.05),但对粗灰分和粗纤维消化率无显著影响(P0.05),其中玉米油组的干物质消化率最高,豆油组的粗蛋白质消化率最高。与对照组相比,热应激条件下饲粮添加牛油或猪油可以显著提高肉兔血清甘油三酯和总胆固醇含量(P0.05);玉米油组和豆油组肉兔血清甘油三酯和总胆固醇含量则与对照组差异不显著(P0.05)。与对照组相比,热应激条件下饲粮添加豆油和玉米油可以显著提高肉兔血清超氧化物歧化酶活性和总抗氧化能力(P0.05),显著降低血清丙二醛含量(P0.05);牛油组和猪油组血清超氧化物歧化酶活性、总抗氧化能力和丙二醛含量则与对照组差异不显著(P0.05)。由此可见,热应激条件下,饲粮添加不同来源的脂肪均可提高肉兔生产性能及干物质和粗蛋白质消化率,从整体效果来看,玉米油豆油猪油牛油;饲粮添加牛油或猪油可提高肉兔血清甘油三酯和总胆固醇含量,对机体抗氧化能力的影响不显著;饲粮添加豆油或玉米油对肉兔血清甘油三酯和总胆固醇含量无显著影响,但可显著提高机体的抗氧化能力。