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1.
We studied the effects of dietary n‐3 LC‐PUFAs on the activities and mRNA expression levels of tissue lipoprotein lipase (LPL) and fatty acid synthase (FAS) during vitellogenesis and ovarian fatty acid composition in female silver pomfret broodstock. Broodstock were fed one of four experimental diets for 185 days: FO (100% fish oil), FSO (70% fish oil + 30% soybean oil), SFO (30% fish oil + 70% soybean oil) or SO (100% soybean oil). The results revealed that hepatic LPL and FAS and ovarian FAS activities and mRNA expression levels significantly increased at vitellogenesis and postvitellogenesis relative to previtellogenesis, with no significant differences between these two stages, except for hepatic LPL mRNA expression. Dietary n‐3 LC‐PUFAs decreased tissue FAS and increased LPL activities and mRNA expression levels. The ovarian concentrations of 20:4n‐6 (ARA), 20:5n‐3 (EPA), 22:6n‐3 (DHA) and n‐3 LC‐PUFAs were directly influenced by n‐3 LC‐PUFA levels. Total n‐3 LC‐PUFA concentrations in SO were 57% lower than those in FO, while 18:2n‐6 concentrations in SO were 4.7 ×  higher than those in FO. These results revealed that high dietary n‐3 LC‐PUFAs levels significantly affected tissue lipid metabolism in female silver pomfret broodstock during vitellogenesis by upregulating LPL and downregulating FAS.  相似文献   

2.
半滑舌鳎卵巢发育的组织学和形态数量特征研究   总被引：5，自引：2，他引：3       下载免费PDF全文
采用组织学方法系统研究了人工养殖条件下半滑舌鳎亲鱼卵巢的组织发育周年变化特征.结果表明,卵母细胞发育可分为6个时相,卵巢发育分为6期.卵巢不同发育时期都由不同类型的卵母细胞组成,半滑舌鳎为非同步分批多次产卵类型.周年发育过程中,6月龄前的鱼卵巢发育处于第Ⅰ期;9～12月龄卵巢可发育至第Ⅱ期;12月龄半滑舌鳎性腺可发育达到Ⅲ期,并一直保持至24月龄.3龄雌鱼达到性成熟,卵巢可发育至第Ⅳ期;随着水温和光周期的调控,卵巢发育进入成熟期(Ⅴ期),发生水合现象是卵母细胞成熟并准备排卵的信号;产卵结束后卵巢退化至第Ⅵ期,排出的卵母细胞退化吸收,以Ⅲ期卵巢越冬后,卵巢退化至Ⅱ期并持续至下一个繁殖周期.人工养殖条件下,卵巢内存在卵母细胞闭锁现象.性腺周年发育过程中,性腺指数(GSI)在性腺达到成熟期时达到峰值,产卵结束后性腺快速退化,GSI值各月份差异显著(P<0.05),亲鱼性腺重量在卵巢发育成熟过程中一直处于生长状态.亲鱼肝脏指数(HSI)在产卵前7～8月份(性腺达到成熟期前30 d左右)达到最大,表明7～8月份是性腺进行卵子发育、卵黄能量储备的重要时期,亲鱼在产卵前通过积极摄食储备体内能量,肝脏在卵母细胞卵黄积累方面具有重要的生理作用.肥满度(CF)值在繁殖盛期10～11月份达到最大,表现出与GSI类似的变化趋势.  相似文献   

3.
克氏原螯虾大颚器对卵巢发育的影响   总被引：23，自引：2，他引：21  
赵维信 《水产学报》1999,23(3):229-233
采用埋植和离体方法进行克氏原螯虾的大颚器（ＭＯ）对卵巢发育作用的研究,埋植大颚器７次能显著提高成熟系数和促进卵径增大,处于不同卵巢发育时期的克氏原螯虾大颚器提取物（ＭＯＥ）的离体研究发现,卵黄发生期的ＭＯＥ对初级和次级卵黄发生期卵径增大均有极显著的作用,而对卵黄发生前期的卵径增大无作用,处于卵巢发育早期的ＭＯＥ对卵黄发４生期卵巢小块总ＲＮＡ含量升高无显著作用,处于卵黄发生前期,卵黄发生期和恢复期卵  相似文献   

4.
Molecular cloning, characterization, and functional analysis of follicle-stimulating hormone receptor (FSHR) in female turbot (Scophthalmus maximus) were evaluated. Results showed that the full-length FSHR cDNA was 3824 bp long and contained a 2202 bp open reading frame that encoded a mature protein of 733 amino acids (aa) and a signal peptide of 18 aa. Multiple sequence analyses showed that turbot FSHR has high homology with the corresponding genes of other teleosts and significant homology with that of Hippoglossus hippoglossus. Turbot FSHR has the typical structural architecture of glycoprotein hormone receptors consisting of a large N-terminal extracellular domain, seven transmembrane domains and short C-terminal intracellular domain. FSHR mRNA was found to be abundant in the ovaries, but deficient in eyes, intestine, brain, muscle, gills, spleen, stomach, heart and kidney. Furthermore, FSHR mRNA was found to increase gradually from pre-vitellogenesis to migratory nucleus stages, with the highest values observed during the late vitellogenesis stage of the reproductive cycle. However, FSHR mRNA was found to decrease dramatically during the atresia stage. Meanwhile, functional analysis with HEK293T cells continual expressing FSHR demonstrated that FSHR was specifically stimulated by ovine FSH, but not ovine LH. These results indicate that turbot FSHR is mainly involved in the stimulation of vitellogenesis, regulation of oocyte maturation as well as promotion of ovarian development via specific ligand binding. These findings open doors to further investigation of physiological functions of FSHR, which will be valuable for fish reproduction and broodstock management.  相似文献   

5.
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6.
利用微创手术检查的方法对人工养殖西伯利亚鲟的卵巢发育期进行鉴别,根据卵巢发育期将西伯利亚鲟分为Ⅱ期、Ⅲ期、Ⅳ期、Ⅴ期和Ⅵ期共5个实验组。对5个实验组血清脂蛋白脂酶(LPL)活性及血脂含量进行测定,并对其之间的关系进行分析。结果表明:随着卵巢发育,血清LPL活性、极低密度脂蛋白胆固醇(VLDL-C)、甘油三酯(TG)呈"先上升,后下降"的趋势,其中LPL在Ⅴ期达到最高值,VLDL-C、TG均在Ⅳ期达到最高值;总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)随卵巢发育表现为上升趋势。血清TG与LPL呈正相关关系。  相似文献   

7.
A study of the reproductive biology of the amberjack, Seriola dumerilii, held in captivity was carried out, describing oogenesis as well as the different stages of the ovarian cycle. Seven stages of oocyte development, as well as oogonia, were distinguished. Cortical alveoli were hardly detectable within the oocyte, as they were small, sparse and contained few mucopolysaccharides. It is suggested that their role in the fertilization process might be less important than in other teleost species. Fish aged 3 and 4 years were found to be sexually immature, with ovaries containing only previtellogenic oocytes. Vitellogenesis started in December in fish aged 4 + years. Late-developing ovaries showing deposition of yolk protein granules were found at the end of the 5th year of life (May) in specimens measuring 80.0 ± 3.5 cm standard length. This should be regarded as the minimum size at which sexual maturity is reached in S. dumerilii. Final vitellogenesis and oocyte maturation were, however, inhibited in captivity, and extensive follicular atresia took place as the natural spawning season approached. It is suggested that insufficient gonadotrophic stimulation because of confinement stress may be the cause of failed maturation and spawning in this species under culture conditions.  相似文献   

8.
In the present study, thiourea-induced thyroid hormone depletion and thyroxine (T4) ‘overdose’ were used as a strategy to understand the influence of thyroid hormones on ovarian recrudescence of juvenile (3-months-old), immature (8-months-old) and adult (1-year-old) air-breathing catfish, Clarias gariepinus. Thiourea-induced thyroid hormone depletion in juvenile catfish impaired ovarian development, but no significant effect was observed in immature catfish and during late stage of ovarian recrudescence of mature catfish. T4 treatment in females undergoing late stages of ovarian recrudescence induced rapid oocyte growth by promoting its early entry into maturational phase as evident from the presence of more number of vitellogenic and post-vitellogenic follicles, decrease in aromatse immunoreactivity and reduced estradiol–17β levels. Hence, thyroid hormones have an important role to play during early stages of ovarian development and vitellogenesis of catfish and also indicating that thyroid has a stage dependent effect on ovary.  相似文献   

9.
Ovarian developmental stages and serum steroid hormone levels were examined at six different times of day (0100, 0600, 1000, 1300, 1600, 2000 h) in a marine teleost, the Japanese whiting Sillago japonica, which has an asynchronous-type ovary containing oocytes at various stages of development and spawns every day during a period ranging up to three months. The largest oocytes in the ovaries at the active vitellogenic or post-vitellogenic stages were found between 0100 and 1300 h. Oocyte maturation indicated by germinal vesicle breakdown (GVBD) occurred at 1600 h, and ovulated oocytes were observed in the ovaries collected at 2000 h. These processes were accompanied by a significant daily change in serum steroid hormone levels. The serum level of estradiol-17β showed a peak in fish with mature oocytes sampled at 1600 h. In these fish, the second-largest oocytes in the ovaries were at the initial stage of vigorous vitellogenesis, the secondary yolk stage. Therefore the highest level of serum estradiol-17β was considered to be due to the second-largest oocytes. Testosterone levels remained low and constant throughout the experimental period. The serum levels of 17α,20β-dihydroxy-4-pregnen-3-one (17α,20β-diOHprog) peaked at 1600 h at which time all fish had mature oocytes. These results indicate that the Japanese whiting possesses a diurnal rhythm of oocyte development including vitellogenesis, oocyte maturation and ovulation, and further suggest that daily cycles in oocyte growth and maturation which simultaneously take place in an ovary are regulated by diurnal secretions of estradiol-17β and the maturation-inducing steroid, 17α,20β-diOHprog.  相似文献   

10.
为了探讨普安银鲫(Carassius auratus gibelio)卵黄囊期脂蛋白脂酶(Lipoprotein lipase, LPL)和肝脂酶(Hepatic lipase, HL)的表达特点及葡萄糖和维生素C溶液分别浸泡对它们的影响,本研究采用荧光定量PCR技术检测LPL和HL基因在普安银鲫卵黄囊仔鱼发育中的表达情况及mRNA表达水平,并检测了葡萄糖、维生素C对这两种基因mRNA表达量的影响。结果显示,LPL和HL基因在普安银鲫内源营养期、混合营养期和外源营养期均有表达,且LPL和HL mRNA表达量呈上升变化。葡萄糖组LPL和HL mRNA表达量呈上升变化,维生素C组也呈上升变化。在内源营养期、混合营养期和外源营养期,葡萄糖能显著上调LPL和HL mRNA的表达量(P<0.05);在内源营养期、混合营养期和外源营养期,维生素C能显著上调LPL mRNA的表达量,而HL mRNA的表达量在混合营养期和外源营养期显著高于对照组(P<0.05)。研究表明,普安银鲫发育至混合营养期时,机体内脂质分解代谢增强。适宜水平的葡萄糖、维生素C能诱导LPL和HL mRNA的表达。  相似文献   

11.
中国对虾卵黄蛋白原合成部位的研究   总被引：2，自引：0，他引：2  
十足目甲壳类卵巢中卵黄的来源,在过去的几十年研究中一直存在争议,内源性合成和外源性合成都有报道。本文以雌性中国对虾为实验材料,根据组织学观察确定其发育阶段,试验虾可以分为:卵巢未发育期;卵黄发生前期;初级卵黄发生期和次级卵黄发生期4个时期。从处于不同卵巢发育期对虾的卵巢和肝胰腺中提取总RNA,用RT-PCR的方法初步探讨不同发育期的中国对虾卵巢和肝胰腺中卵黄蛋白原mRNA的表达,确定是否存在卵黄蛋白原的合成功能。结果发现,从卵巢未发育期到次级卵黄发生期的卵巢和肝胰腺中都有卵黄蛋白原mRNA的表达,说明二者为卵黄蛋白的合成部位。  相似文献   

12.
本研究旨在探究维生素C(V_C)对圆斑星鲽(Verasper variegatus)早期发育中孵化率、出膜率和成活率的影响,对其消化酶和脂蛋白脂酶(Lipoprotein lipase,LPL)及肝脂酶(Hepatic Lipase,HL)的影响。实验用圆斑星鲽为人工受精卵,分为5组,孵化水体V_C浓度分别为0、20、25、30和35 mg/L,分别在成熟卵、受精卵、原肠中期、晶体出现期、内源营养期(2日龄)、混合营养期(6日龄)及外源营养期(9日龄)取样。记录圆斑星鲽的出膜时间、出膜率和成活率,测定对照组和生长指标优越组的消化酶活性和2种酯酶的活性。结果显示,25 mg/L的V_C能显著提高圆斑星鲽的出膜率和成活率,并缩短出膜时间(P0.05)。V_C能促进圆斑星鲽早期发育过程中蛋白质的沉积。外源营养期后,胃蛋白酶活性显著提高(P0.05),淀粉酶活性在混合营养期显著提高(P0.05),脂肪酶和胰蛋白酶活性在内源营养期就显著提高(P0.05)。25 mg/L V_C溶液浸泡使圆斑星鲽胚胎发育过程中的LPL和HL比活力显著升高(P0.05)。合子中的LPL和HL基因可能在原肠期开始表达,合成脂质水解酶分解脂质,为胚胎发育供能。研究表明,圆斑星鲽成熟卵受精后脂肪酶和胰蛋白酶酶优先发挥作用,分解卵黄中的碳水化合物为胚胎发育迅速提供能量。25 mg/L的V_C能显著提高消化酶活性,并促进蛋白质的沉积,有利于孵化成活的V_C浓度可以显著促进圆斑星鲽早期发育的脂质代谢。  相似文献   

13.
Coho salmon Oncorhynchus kisutch are semelparous spawners with highly synchronized oocyte growth. Plasma was collected from maturing female fish and plasma lipids were quantified by lipoprotein class. Stable 13C isotopes were employed to investigate the origins of plasma lipids. Plasma lipoproteins were partitioned into the very low density (VLDL), low density (LDL), high density (HDL) and very high density (VHDL) lipoprotein classes. Lipids from all lipoprotein classes increased between the lipid droplet and early vitellogenesis stages of oocyte growth and VHDL lipids continued to increase through mid vitellogenesis (P < 0.05). During vitellogenesis, total plasma lipid concentrations were similar to the sum of lipoprotein lipids (P = 0.51). Plasma vitellogenin determined by an ELISA method was very well correlated with VHDL lipid during vitellogenesis (R2 = 0.91, n = 15). In general, the δ13C values of plasma lipids reflected that of feed (exogenous) and muscle (endogenous) lipids when feed and muscle δ13C values were similar, and were intermediate when differences existed between the two lipid sources. With one exception, the δ13C values of lipids from all lipoprotein classes within a plasma sample were similar. Results indicate that during sexual maturity, lipids from all plasma lipoprotein classes originate from a common pool of exogenous and endogenous lipids.  相似文献   

14.
Although gonadotrophins are major regulators of ovarian function in teleosts and other vertebrates, accumulating evidence indicates that the growth hormone (GH)-insulin-like growth factor (IGF) axis also plays an important role in fish reproduction. As a first step to understand the physiological role of the GH-IGF system in the ovarian development of starry flounder (Platichthys stellatus), the expression profiles of GH and IGF messenger RNAs (mRNAs) and plasma GH, IGF-I, estradiol-17β (E2), and testosterone (T) levels during the ovarian development were investigated. The developmental stages of ovaries were divided into five stages (II, III, IV, V, and VI) by histological analysis. The hepatosomatic index (HSI) and gonadosomatic index (GSI) values increased and peaked at stage IV and stage V, respectively, and then declined at stage VI. Pituitary GH mRNA levels decreased sharply at stage III and raised to top level at stage VI. The hepatic IGF-I mRNA levels ascended to maximum value at stage V and then declined significantly at stage VI. However, the hepatic IGF-II mRNA levels remained stable and increased significantly at stage VI. In contrast, the ovarian IGF-I mRNA levels increased gradually and peaked at stage VI. The ovarian IGF-II mRNA levels were initially stable and increased significantly at stage V until the top level at stage VI. Consistent with the pituitary GH mRNA levels, plasma GH levels reduced sharply at stage III and remained depressed until stage V and then raised remarkably at stage VI. Plasma IGF-I level peaked at stage V and then declined to initial level. Plasma E2 level peaked at stage IV and then dramatically descended to the basal level. Plasma T level peaked at stage V and then declined significantly back to the basal level. Based on statistical analysis, significant positive correlations between hepatic IGF-I mRNA and GSI, ovarian IGF-II mRNA and hepatic IGF-II mRNA, ovarian IGF-I mRNA and ovarian IGF-II mRNA, and plasma IGF-I and plasma T were observed, respectively. These results suggest that the GH-IGF system may be involved in the ovarian development of starry flounder; GH and IGFs appear to play distinct roles in the regulation of the ovarian development in paracrine/autocrine manners. These findings extend our knowledge of the roles of the GH-IGF axis on reproduction regulation in fish.  相似文献   

15.
A study was conducted to determine the effects of dietary phospholipid (PL) levels in cobia (Rachycentron canadum) larvae with regard to growth, survival, plasma lipids and enzymes of lipid metabolism. Fish with an average weight of 0.4 g were fed diets containing four levels of PL (0, 20, 40 and 80 g kg−1dry matter: purity 97%) for 42 days. Final body weight (FBW), weight gain (WG) and survival ratio were highest in the 8% PL diet group and mortality was highest in PL-free diet group. We examined the activities of lipoprotein lipase (LPL) and hepatic lipase (HL) in liver, lecithin-cholesterolacyltransferase (LCAT) in plasma as well as plasma lipids and lipoprotein. LCAT activity showed a decrease of more than two-fold in PL-supplemented diet groups compared with the PL-free diet group. HL activity was highest in the 8% PL diet group and the other three groups showed no difference. LPL activity was significantly higher in the PL-supplemented diet groups than in the PL-free diet group. The dietary intervention significantly increased plasma phospholipids and total cholesterol (TC) levels, and the higher free cholesterol (FC) level contributed to the TC level. However, the fish fed PL exhibited a significantly decreased plasma triglyceride (TG) level. The lipoprotein fractions were also affected significantly by the PL. The PL-supplemented diet groups had significantly higher high-density lipoprotein (HDL) compared with the PL-free diet group, but showed a marked decrease in very low-density lipoprotein (VLDL). The results suggested that PL could modify plasma lipoprotein metabolism and lipid profile, and that the optimal dietary PL level may well exceed 80 g kg−1 for cobia larvae according to growth and survival.  相似文献   

16.
Wild‐caught and pond‐reared female mud crab Scylla serrata at different stages of ovarian maturation were collected from Samar and Capiz, Philippines. Crabs were categorized into five stages according to the external morphological and microscopic appearance of the most advanced oocytes. The ovaries, hepatopancreas, muscle and newly spawned eggs (NSE) were analysed for lipid class components and fatty acids. Total lipid was higher in pond‐reared than in wild‐caught crabs but increased with ovarian maturation in both groups. Ovarian lipid peaked at the fully mature stage, coinciding with a decline in hepatopancreatic and muscle lipids. Lipid levels declined significantly in spent females. The tissues contained elevated highly unsaturated fatty acids such as arachidonic (20:4n‐6), eicosapentaenoic (20:5n‐3) and docosahexaenoic (22:6n‐3) acids, but at higher levels in late maturing and fully mature ovaries and in NSE. The type of lipid class and fatty acid components in mature ovaries as well as in NSE are generally considered to be indicative of their importance in reproductive physiology and embryonic and larval development.  相似文献   

17.
To investigate the correlation between lipid deposition variation and stocking density in Amur sturgeon (Acipenser schrenckii) and the possible physiological mechanism, fish were conducted in different stocking densities (LSD 5.5 kg/m3, MSD 8.0 kg/m3, and HSD 11.0 kg/m3) for 70 days and then the growth index, lipid content, lipase activities, and the mRNA expressions of lipid-related genes were examined. Results showed that fish subjected to higher stocking density presented lower final body weights (FBW), specific growth ratio (SGR), and gonad adipose tissue index (GAI) (P < 0.05). Lower lipid content was observed in the liver, gonad adipose tissue and muscle in sturgeons held in HSD group (P < 0.05). The serum concentrations of triglyceride (TG), total cholesterol (TC), and high-density lipoprotein cholesterol (HDL-C) decreased significantly with increasing stocking density, while no significant change was observed for low-density lipoprotein cholesterol (LDL-C). Furthermore, the cDNAs encoding lipoprotein lipase (LPL) and hepatic lipase (HL) were isolated in Amur sturgeon, respectively. The full-length LPL cDNA was composed of 1757 bp with an open reading frame of 501 amino acids, while the complete nucleotide sequences of HL covered 1747 bp encoding 499 amino acids. In the liver, the activities and mRNA levels of LPL were markedly lower in HSD group, which were consistent with the variation tendency of HL. Fish reared in HSD group also presented lower levels of activities and mRNA expression of LPL in the muscle and gonad. Moreover, the expressions of peroxisome proliferator-activated receptor α (PPARα) in both the liver and skeletal muscle were significantly upregulated in HSD group. Overall, the results indicated that high stocking density negatively affects growth performance and lipid deposition of Amur sturgeon to a certain extent. The downregulation of LPL and HL and the upregulation of PPARα may be responsible for the lower lipid distribution of Amur sturgeon in higher stocking density.  相似文献   

18.
Tissues (hepatopancreas, muscle, gonad) of wild Penacus mordon females with ovaries in different stages of development and males were analyzed for Upid content and fatty acid composition. Hepatopancreatic tissue had the highest mean levels of lipid at 15.72–25.20% in females and averaged 46.20 ± 1.53% in males. Levels of Lipid in the muscle were low with no marked variation throughout the maturation s-es. Ovarian lipid levels increased significantly at stage II (early maturing ovaries) and remained high through stage IV (fully mature ovaries). Peak lipid level was found at stage III (late maturing ovaries) and coincided with a decline in hepatopancreas lipid. Ovarian and hepatopancreatic lipids declined drastically in spent females. Profiles of fatty acid in the tissues consistently showed the presence of PUFA 204n-6, 20:5n-3 and 22611-3, with high levels in the polar lipid fraction of vitellogenic ovaries. These values were reflected in the male testis and spawned eggs. The finding suggest storage and utilization of lipids for maturation and spawning processes and that the phospholipids were mainly responsible for increases in ovarian lipids. The type of fatty acids present in maturing prawn ovaries is indicative of their importance in reproductive physiology.  相似文献   

19.
The present study examined the differential mRNA expression levels of three forms of GnRH (sGnRH, pjGnRH and cGnRH-II) and two forms of GnRH receptor (pjGnRH-R I and pjGnRH-R II) in the brain, pituitary, and ovaries of pejerrey in relation to the reproductive status. The analysis revealed the presence of significant amounts of mRNA of the three GnRH forms while the ovaries showed only two (sGnRH and pjGnRH). The GnRH receptor II was found ubiquitously in the brain, pituitary, and ovaries while the form I was detected only in the brain. The levels of pjGnRH mRNA in the brain and pjGnRH-R II in the pituitary gland varied in correlation with the ovarian condition. However, brain sGnRH and pjGnRH-R I mRNA levels reached a maximum during early stages of ovarian development. In contrast, the brain levels of cGnRH-II mRNA showed no variation. The present study also shows a good correlation of ovarian sGnRH and pjGnRH-R II mRNA levels with the reproductive condition, suggesting that these molecules are may be involved in the regulation of pejerrey ovarian function.  相似文献   

20.
瓯江彩鲤生殖周期内卵巢成熟系数及脂类、脂肪酸的变化   总被引：1，自引：0，他引：1  
采用生化方法测定了瓯江彩鲤(Cyprinus carpio var.color)卵巢不同发育时期的成熟系数及卵巢脂类、脂肪酸含量与组成,旨在了解瓯江彩鲤卵巢中脂类、脂肪酸的变化与卵巢发育及卵细胞成熟之间的关系。结果显示:卵巢中总脂含量在产卵前最高,占干重17.62%,产卵后显著下降到12.84%(P<0.05),到快速生长期又出现稍微下降,之后在越冬期开始呈上升趋势。4个时期中,C16∶0(软脂酸)、C18∶1n-9c(油酸)、C18∶2n-6c(亚油酸)均是卵巢中的主导脂肪酸,其含量显著高于其它脂肪酸(P<0.05);产卵前,卵巢中脂肪酸含量高,但种类较少,产卵后,卵巢中脂肪酸含量低,但种类较多;随卵巢的发育,不饱和脂肪酸的比例增加,从快速生长期到产卵前,C20∶4n-6(ARA)与C22∶6n-3(DHA)的含量逐渐上升,最高分别达11.63 mg/g、17.80 mg/g。结果表明:不同时期卵巢中脂类含量与成熟系数呈正相关,卵巢成熟需积累较多脂类物质。不饱和脂肪酸尤其是DHA、ARA对卵巢的成熟具有重要作用。  相似文献   

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