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1.
日粮能量水平对肥育猪肌内脂肪含量、肌内和皮下脂肪组织脂肪酸组成的影响 总被引:2,自引:0,他引:2
以添加豆油方式提高日粮能量水平,研究其对肥育猪肌内脂肪(IMF)含量、肌内和皮下脂肪的脂肪酸组成的影响.36头杜长大母猪(平均体质量约40 kg)随机平均分为3组,分别饲喂3种能量水平(DE=12.82、14.24、15.66 MJ·kg-1,主要以添加豆油来提高日粮能量水平)的日粮.达到屠宰体质量(约90 kg)时每组屠宰5头,采取背最长肌和背部皮下脂肪,测定背最长肌IMF含量、肌内和皮下脂肪组织的脂肪酸组成.结果表明:不同能量水平日粮对IMF含量影响不显著(P>0.05);肌内和皮下脂肪的大部分饱和脂肪酸(SFA)和单不饱和脂肪酸(MUFA)含量随着日粮能量水平的提高而显著下降(P<0.05),大部分多不饱和脂肪酸(PUFA)含量随着日粮能量水平的提高而显著增加(P<0.05);IMF中PUFA(包括C18:3n6、C20:0、C20.4n6、C22:5n3)和C24:1的含量与IMF含量呈显著负相关;肌内和皮下脂肪组织中的大部分脂肪酸呈显著正相关,而少数脂肪酸(包括C18:3n6、CLA-c9t11、C20:0、C20:4n6、C22:5n3和C24:1)在2个组织中没有显著相关性;总体上看,2组织中的SFA、MUFA之间呈显著正相关,与PUFA呈显著负相关,PUFA之间呈显著正相关.本研究表明以添加豆油的方式提高日粮能苘量水平可以在不降低IMF含量的前提下改善猪肉的脂肪酸组成,从而提高猪肉的营养价值而不降低肉质. 相似文献
2.
本文对太阳能的起源、传播、与物质的相互作用以及储存和利用等各个方面所涉及的物理学定律,特别是对太阳能热利用所涉及的热力学定律进行了概括和归纳。根据热力学定律指出太阳能热利用的真正适用范围。 相似文献
3.
Kankofer M Radzki RP Bieńko M Albera E 《Journal of veterinary medicine. A, Physiology, pathology, clinical medicine》2007,54(5):225-229
The lack of protective action of oestrogens which appears during menopausal period may be the reason of serious metabolic disturbances including oxidative stress. The hypothesis was stated that ovariectomy may induce the variations of antioxidant/oxidant status which can be detected in rat liver. A total of 102 healthy Wistar female rats were included in the experiment and divided into control (CON; n = 6), sham-operated (SHO; n = 48) and ovariectomized (OVX; n = 48) groups. Animals from SHO (n = 6) and OVX (n = 6) groups were killed every week during 8 weeks of experiment to detect dynamic changes in examined parameters. Anti-oxidative enzyme activities [glutathione peroxidase (GSH-Px); superoxide dismutase (SOD)] as well as total antioxidant capacity (TAC) and the intensity of lipid peroxidation, measured by the concentration of N,N,diethyl-p-phenylene diamine (DEPPD) radical, were determined in liver homogenates by the use of spectrophotometric methods. Wave-like patterns of examined parameters within 8 weeks of experiment were detected. GSH-Px activity tended to be higher in OVX animals and was significantly lower at 8th week when compared with 1st week of experiment. SOD activity was higher in SHO animals and showed significant differences between 3rd, 4th, 7th and 1st week. TAC values were significantly higher in OVX when compared with SHO groups in 2nd, 4th, 5th week and significantly lower in 3rd, 6th and 7th week of the experiment. The concentration of DEPPD radicals tended to increase in OVX group. In conclusion, ovariectomy which leads to oestrogen insufficiency is reflected as well in variation of anti-oxidative/oxidative parameters in rat liver homogenates. 相似文献
4.
杂交棉A—92的高产生理特点与配套栽培技术探讨 总被引:3,自引:0,他引:3
就杂交棉A-92生长发育特点、干物质生产与分配,产量形成规律及配套栽培等方面进行探讨。结果表明:杂交棉A-92干物质生产与积累、籽皮棉产量、单株成铃数、铃重、总果节数、节枝比、铃枝比、叶面积系数、根系活力等均高于对照种鄂荆1号,具有明显地竞争优势。杂种主要来源于单株叶面积扩大,特别是果枝叶面积增长速度较快;产量优势主要表现为早发明显、伏明桃增多和单铃重增加。结合多年示范、试验结果,栽培技术上在适当 相似文献
5.
针对盘刀式铡草机存在的生产率低、功耗大、易堵塞等问题,以玉米秸秆为试验材料,选取不同的主轴转速、叶片倾角和秸秆含水率作为试验因素进行抛送性能试验研究。试验结果表明:各因素对抛送过程生产率影响的主次顺序为主轴转速>叶片倾角>秸秆含水率;对抛送过程功耗影响的主次顺序为主轴转速>秸秆含水率>叶片倾角。当叶片倾角为7°、主轴转速为650r/min、秸秆含水率为22.1%时,抛送过程生产率最高;当叶片倾角为11°、铡草机主轴转速为510r/min、秸秆含水率为27.3%时,抛送过程功率消耗最低;同时,得到了可用于预测铡草机抛送过程生产率和功率消耗的线性回归模型。 相似文献
6.
7.
选用山楂,胡萝卜,沙棘,穗醋粟,姜5种果蔬作为复合汁的材料,对复合汁Vc的稳定性及其在贮藏过程中的变化进行了研究。试验表明,果蔬复合汁在贮藏过程的前期,Vc损失迅速,以后Vc的变化趋于缓慢,在5种果蔬原料中,沙棘汁对Vc具有明显的保护作用,姜汁对Vc具有一定的破坏作用。 相似文献
8.
Renhui Zhao Bingliang Liu Zhengning Jiang Tiantian Chen Ling Wang Yaoyong Ji Zhubing Hu Huagang He Tongde Bie 《Plant Breeding》2019,138(5):503-512
Wheat‐Dasypyrum villosum translocations T6V#2S·6AL and T6V#4S·6DL, carriers of Pm21 and PmV, respectively, confer high resistance to wheat powdery mildew. For better understanding of the difference in genetic effect between them, a RIL population was constructed based on the cross between “Yangmai 18” carrying T6V#2S·6AL and “Yangmai 22” carrying T6V#4S·6DL. Analysis of distribution of the translocations showed that T6V#2S·6AL is much more transmittable than T6V#4S·6DL. By comparing their effects on main agronomic traits, we firstly found that T6V#2S·6AL contributes greatly to top spikelet fecundity, but causes a decrease of 6.7%–10.5% of spike number. No stable effects of T6V#4S·6DL on agronomic traits were found, except for positive effect on plant height. Excitingly, a new recombinant, T6V#4S‐6V#2S·6AL carrying PmV, was screened and proved to have a higher transmission rate than the original translocation T6V#4S·6DL, which will greatly promote the utilization of PmV. The above conclusions of this research will provide important guidance for utilization of Pm21 and PmV more effectively, in wheat powdery mildew resistance breeding. 相似文献
9.
Development of a kompetitive allele‐specific PCR marker for selection of the mutated Wx‐D1d allele in wheat breeding
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Wenjing Hu Yun Zhao Tongde Bie Derong Gao Datong Liu Ronglin Wu Xiaoming Cheng Shunhe Cheng Yong Zhang 《Plant Breeding》2017,136(4):460-466
Waxy (Wx) protein is a key enzyme for synthesis of amylose in endosperm. Amylose content in wheat grain influences the quality of end‐use products. Seven alleles have been described at the Wx‐D1 locus, but only two of them (Wx‐D1b, Wx‐D1e) were genotyped with codominant markers. The waxy wheat line K107Wx1 developed by treating ‘Kanto 107’ seeds with ethyl methanesulphonate carries the Wx‐D1d allele. However, no molecular basis supports this nomenclature. In the present study, DNA sequence analysis confirmed that a single nucleotide polymorphism in the sixth exon of Wx‐D1 changed tryptophan at position 301 into a termination codon. Based on this sequence variation, a PCR‐based KASP marker was developed to detect this point mutation using 68 BC8F1 plants and 297 BC8F2 lines derived from the cross ‘Ningmai 14’*9/K107Wx1. Combined with codominant markers for the Wx‐A1 and Wx‐B1 alleles, waxy and non‐waxy near‐isogenic lines were distinguished. The KASP marker was efficient in identifying the mutant allele and can be used to transfer waxiness to elite lines. 相似文献
10.
继代培养基再利用研究 总被引:10,自引:0,他引:10
利用组织培养法繁育三倍体山杨继代丛生无根苗过程中,为降低育苗成本,利用回收转换后废弃的继代培养基,进行再利用试验研究,分别加入了原继代培养基10%,20%,30%,40%,50%的母液,不加琼脂和糖,用原继代培养基做对照。 相似文献