中草药复方添加剂对繁殖后期种公鸡精液品质及种蛋受精率的影响

选用80只50周龄尼克T种公鸡随机分成Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ组,每组16只。Ⅰ、Ⅱ组为对照组,分别饲喂基础日粮和基础日粮添加鸡蛋,Ⅲ、Ⅳ、Ⅴ组为试验组,分别饲喂基础日粮中添加1%、2%、3%中草药复方添加剂的日粮,研究中草药复方添加剂对繁殖后期种公鸡精液品质及种蛋受精率的影响。结果表明:日粮中添加中草药复方添加剂能显著提高种公鸡的精液品质和精子活力,降低精子畸形率,并且能提高种蛋受精率和健雏率,其中2%添加组效果最明显。     

不同添加剂处理对小麦秸黄贮饲料发酵品质的影响

为研究纤维素酶和乳酸菌制剂以及尿素对小麦秸黄贮饲料品质的影响,分别设不同的处理组及对照进行小麦秸黄贮饲料的发酵试验。实验Ⅰ结果表明:尿素单独添加、尿素和纤维素酶混合添加显著提高粗蛋白的含量,尿素和乳酸菌制剂、以及尿素与乳酸菌制剂和纤维素酶混合添加都不能得到品质较好的小麦秸黄贮饲料。实验Ⅱ结果表明:各添加剂处理均显著降低黄贮饲料的pH值和中性洗涤纤维含量(P<0.05),显著提高乳酸、总酸和粗蛋白含量(P<0.05);添加剂处理能够明显改善小麦秸黄贮饲料的发酵品质,提高小麦秸的饲用价值。纤维素酶和乳酸菌制剂同时添加时,小麦秸黄贮饲料品质最好。     

四倍体高粱与约翰逊草杂交种饲用品质分析

利用四倍体高粱品系"四沈甜"、不育系"四6A"和约翰逊草,配置"四沈甜"×约翰逊草、"四6A"×约翰逊草和"四6A"×"四沈甜"杂交种,分析了杂交种及杂种分离世代的不同生长阶段的杂种优势及饲草品质。结果表明,在孕穗期各供试材料粗蛋白质含量最高,杂交种蛋白质含量达到10%～15%,随着发育期的推进,含量有所下降。抽穗期,粗脂肪含量达到6.1%～7.9%。各材料的粗纤维含量都在30%以上,不同生长阶段差异不显著。单位能量值在抽穗期最高,达到18MJ/kg左右。综合各营养成分含量和单位能量分析,初步认为四倍体高粱与约翰逊草杂交种可以作为饲草应用,抽穗期为刈割和利用的最佳时期。     

文昌鸡产蛋性能及蛋品质研究

本文就文昌鸡产蛋规律、种蛋品质进行研究.结果表明:文昌鸡开产后第7周前产蛋率快速上升,到开产后第7周或第8周,产蛋率到达最高峰,60%以上的产蛋率能维持15～18周,经过产蛋高峰期后,产蛋率缓慢下降,期间略有波动,说明文昌鸡的产蛋性能良好;文昌鸡55周龄蛋品质性状蛋重(EW)、蛋壳重(SW)、蛋壳厚度(ST)、蛋壳强度(SS)、哈氏单位(HU)、蛋形指数(SI)、蛋黄重(YW)、蛋黄颜色(YC)的测定结果平均值分别为49.00g、6.34 g、320.69μm、4.01 kg/cm2.70.02、1.31、16.45 g、6.13.     

活性氧(ROS)对小鼠早期胚胎胚细胞分裂的影响

在体外CZB培养的不同时期添加过氧化氢(2.1μmol/L),发育至囊胚阶段,制作胚胎标本,观察其囊胚发育率、胚细胞数和分裂相数。结果显示:0~12 h组和0~72 h组的胚胎发育率显著低于其他几组(P<0.05),对照组、12~24 h组、24~36 h组、36~48 h组之间均差异不显著(P>0.05);各组之间的胚细胞数和分裂指数均无显著差异。说明胚胎在体外培养时,2细胞期胚胎对外源性H2O2最敏感,也最容易发生发育阻滞。但是经H2O2处理之后,度过2细胞期发育阻滞的胚胎能在以后的发育中发生补偿性生长,其胚细胞数和分裂指数都和体外正常发育的胚胎没有差异。     

Suppressive effect of liquid potassium silicate on powdery mildew of strawberry in soil

A soil drench of soluble silicon (liquid potassium silicate) was tested for the control of powdery mildew of strawberry in soil for 2 years in a vinyl house under growers' conditions on two cultivars: very susceptible Toyonoka and slightly susceptible Sachinoka. Soluble silicon suppressed the disease more effectively as a preventive control than as a control to reduce initial incidence. The suppressive effect against this disease was more effective for Toyonoka than for Sachinoka. The control value of soluble potassium silicate was 85.6% for Toyonoka in the first year and 60.2% in the second year, while for Sachinoka it was 58% in the first year and 40.6% in the second year. Strawberry leaf hardness was measured for the control and silicate-treated leaves. Although silicate-treated leaves seemed to be harder than control leaves, leaf hardness did not vary significantly between controls and silicate-treated leaves in either of the 2 years, and the mode of preventive action of liquid potassium silicate remains unknown. A factor other than a physical action may be involved.     

日粮锌水平对种公鸡生长性能及精液品质的研究

试验选用10周龄伊莎父母代种公鸡45羽,随机分为3组,每组15羽作为试验动物,通过在基础饲粮中添加0 mg/kg、60mg/kg、180mg/kg的锌,研究日粮锌水平对种公鸡生长性能及精液品质的影响.结果表明,日粮锌水平对种公鸡从31周龄到34周龄体重和料重比无显著影响(P＞0.05),且不同周龄各组差异均不显著(P＞0.05);31周龄周增重试验Ⅱ组与对照组差异达到了显著水平(P＜0.05);32周龄试验Ⅱ组与试验Ⅰ组和对照组差异极显著(P＜0.01);33周龄试验Ⅱ组与对照组差异也极显著(P＜0.01);精子活率和生存指数差异不显著(P＞0.05);试验Ⅰ组精子密度极显著高于对照组与试验Ⅱ组(P＜0.01);试验Ⅰ组精液量显著低于试验Ⅱ组(P＜0.01)和对照组(P＜0.05);试验Ⅰ、Ⅱ组有效精子数接近(P＞0.05),但试验Ⅰ组有效精子数显著高于对照组(P＜0.05);精液pH值对照组极显著高于试验Ⅰ组与试验Ⅱ组(P＜0.01).     

饲料营养对猪肉品质的影响

对影响猪肉品质的主要营养因素:能量、脂肪和脂肪酸、蛋白质和氨基酸、维生素、矿物质元素及其它饲料添加剂的饲养试验效应进行了综述,并提出了今后有待解决的问题.     

Expression of E‐cadherin in canine anal sac gland carcinoma and its association with survival*

The objective of this study was to determine whether an association could be demonstrated between survival and the expression of the adhesion molecule E‐cadherin by the neoplastic cells in a group of dogs with anal sac gland carcinomas (ASGCs). Archived formalin‐fixed, paraffin wax‐embedded primary tumour specimens were obtained for 36 cases of canine ASGC with known clinical management and survival data. Immunohistochemical methods were used to evaluate E‐cadherin expression by the neoplastic cells and data were evaluated for an association between E‐cadherin expression and survival. On univariate analysis, the median survival time for cases with tumours expressing E‐cadherin in more than 75% of cells was significantly greater than that for cases with tumours expressing E‐cadherin in fewer than 75% of cells (1168 versus 448 days, P = 0.0246). Both E‐cadherin expression and presence or absence of distant metastases were significantly associated with survival on multivariate analysis. This study demonstrates that expression of E‐cadherin at the cytoplasmic membrane in canine ASGCs is variable and potentially predictive of survival.     

The Effect of Gender on Slaughtering Performance and Meat Quality in Sunite Sheep

The purpose of this experiment was to study the effect of gender on the slaughter performance and meat quality of Sunite sheep.Twelve 6-month-old Sunite rams and ewes at the same body condition were selected from the grazing herds of the Sunite Zuoqi Improvement Station Breeding Farm to determine their slaughter performance and meat quality.The slaughter test results showed that the bone quality and bone-meat ratio of the rams were significantly higher than that of the ewes (P<0.05),and the net meat quality and net meat rate of the ewes were significantly higher than that of the rams (P<0.05).The results of meat quality traits showed that the drip loss of ewes were significantly lower than that of rams (P<0.05),and the other indicators were not significantly different (P>0.05).The results of conventional nutrient composition of muscles showed that the intramuscular moisture content of the rams were significantly higher than that of the ewes (P<0.05),and the intramuscular fat content of the ewes were significantly higher than that of the rams (P<0.05),while the other indicators were not significantly different (P>0.05).The results of amino acid determination showed that the essential amino acid ratio in muscle of sunite ewes were significantly higher than that of rams (P<0.05),but there was no significant difference between the rams and ewes that formed the precursor amino acid content of meat flavor (P>0.05).Fatty acid measurement results showed that the saturated fatty acid ratio in the subcutaneous fat of rams was significantly lower than that of ewes (P<0.05).There was no significant difference in the ratio of saturated fatty acids in muscle fat and tail fat (P>0.05);The ratio of monounsaturated fatty acids in ewes tail fat was significantly higher than that of rams (P<0.05).The ratio of monounsaturated fatty acids in subcutaneous fat and intermuscular fat was not significantly different between rams and ewes (P>0.05).The ratio of polyunsaturated fatty acids in intermuscular fat of rams was significantly higher than that of ewes (P<0.05),and there was no significant difference in the content of polyunsaturated fatty acids in subcutaneous fat and tail fat (P>0.05).In summary,it showed that gender had a certain influence on the slaughter performance and meat quality of 6-month-old Sunite sheep.