Forestomach developmental failure in an 11-month-old Japanese Black steer with severely retarded growth and chronic ruminal tympany     

Tetsushi ONO  Keiichi HISAEDA  Yoichi INOUE  Yutaka YAMADA  Kenichi SHIBANO  Ikki MITSUI  Chizuka HENMI  Yumi UNE  Hideaki HAYASHI  Sanggun ROH  Masakatsu NOHARA  Eiji UCHIDA  Hajime NAGAHATA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(2):220

This study reports findings from the pathological examination of the forestomach of an 11-month-old Japanese Black steer with severely retarded growth (41% of expected weight) and chronic ruminal tympany. The ruminal papillae were weakly formed (0.3–0.5 cm long) and unevenly distributed. The cellulae and cristae reticuli were underdeveloped; the cristae were 0.4–0.7 cm in height and milky white. The keratinized layer in the stratified squamous epithelium was thickened. Ruminal pH was 5.25, and ruminal volatile fatty acid concentration was 11.7 mM. The steer’s severely retarded growth was considered to be caused by malnutrition due to developmental and functional failure of the forestomach.  相似文献   

Anaerobic co-digestion of dairy manure and Japanese knotweed (Fallopia japonica) under thermophilic condition: Optimal ratio for biochemical methane production     

Zhifei Pan  Guangdou Qi  Fetra J. Andriamanohiarisoamanana  Takaki Yamashiro  Masahiro Iwasaki  Kazutaka Umetsu 《Animal Science Journal》2021,92(1):e13523

Anaerobic co-digestion of animal manure and lignocellulosic biomass is a potent approach for sustainable biomethane production. Co-digestion of dairy manure (DM) and Japanese knotweed (JK), which was collected from a riverbank, was investigated at five different DM-to-JK mixing ratios (100:0, 90:10, 80:20, 60:40, and 0:100; wet weight basis) under thermophilic condition. The results showed that the methane yields obtain from the co-digestion of DM and JK were much higher than that obtained from JK alone (104 ml/gVS), which indicates the synergistic effect and the benefits of co-digesting JK with DM. The highest methane yield (232 ml/gVS) was obtained from the DM-to-JK ratio of 90:10, which was 14.9% and 123.1% higher than that from DM and JK alone, respectively. It also showed the highest synergistic effect (61 ml/gVS). However, further increase in JK ratios led to the decrease in methane yield and synergistic effect. Therefore, applying the co-digestion of DM and JK at a ratio of 90:10 is recommended for biomethane production.  相似文献   

Influence of strain and flock age on geometrical and mechanical attributes of eggs produced from Japanese quail birds     

Moataz Fathi  Bandar Aloyaydi  Ibrahim Al-Homidan  Osama Abou-Emera 《Animal Science Journal》2021,92(1):e13628

We investigated how the geometrical and mechanical properties of eggshell of Japanese quail are affected by strain and flock age. Two strains of quail (white and gray) were used in the current experiment. The results showed that there was no significant difference for all geometric measurements due to strain effect. Eggs produced from the older birds showed significantly higher (P < 0.01) values compared with younger age for all studied traits. Eggs produced from quails at 22 weeks had a significantly (P < 0.01) darker yolk color than that of the younger age. Superiority in shell thickness, shell weight, and breaking force was detected in eggs of gray quails compared with white quails. On the other hand, the eggs from white quails had significantly higher values for static stiffness and Young's modulus as compared with those of gray counterparts. A significant decrease (P < 0.01) was found for fracture toughness and Young's modulus in eggs of aged birds. A significant negative relationship was found between the breaking force and both static stiffness and Young's modulus. A significant positive relationship was observed between breaking force and both shell thickness and shell percentage. The phenotypic correlation between eggshell breaking force and toughness was relatively high.  相似文献   

Photoperiod-Specific Expression of Eyes Absent 3 Splice Variant in the Pars Tuberalis of the Japanese Quail     

Nobuhiro Nakao  Kei Nakagawa  Asuna Sasaki  Arisa Yamaguchi  Nobumichi Tsushima  Minoru Tanaka 《The Journal of Poultry Science》2021,58(1):64

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Genomic imprinting variances of beef carcass traits and physiochemical characteristics in Japanese Black cattle     

Keiichi Inoue  Yoshinobu Inoue  Toshiaki Oe  Masami Nishimura 《Animal Science Journal》2021,92(1):e13504

The objective of this study was to estimate variance components related to imprinting for carcass traits and physiochemical characteristics in Japanese Black cattle. The carcass records obtained from 4,220 Japanese Black feedlot cattle included carcass weight (CW), rib eye area (REA), rib thickness, subcutaneous fat thickness, and beef marbling score (BMS), and the physiochemical characteristics were fat, moisture, glycogen per proportion of moisture content, oleic acid, and monounsaturated fatty acids (MUFA). To detect gametic effects, an imprinting model was fitted. High additive heritabilities were estimated for all traits (from 0.516 for glycogen to 0.853 for fat) and were reduced in Mendelian heritability. The range of the differences was from 0.002 (CW) to 0.331 (fat and moisture), and the reductions were due to their imprinting variances. The ratio of the imprinting variance to the total additive genetic variance for REA (0.374), BMS (0.291), fat (0.387), moisture (0.388), and MUFA (0.337) were large (p < 0.05). These imprinting variances were due to the maternal contribution and suggested the existence of maternally expressed genomic imprinting effects on the traits in Japanese Black cattle. Therefore, maternal gametic effects should be considered in breeding programs for Japanese Black cattle.  相似文献   

天蚕白僵病的菌种鉴定及致病性的研究   总被引：1，自引：0，他引：1  

高玉章  刘淑敏 《沈阳农业大学学报》1992,23(3):224-226

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IBA促进日本晚樱绿枝扦插生根机制研究   总被引：6，自引：0，他引：6  

王小蓉  曾伟光  熊庆娥 《西南大学学报(自然科学版)》2004,26(5):597-600

IBA处理促进了插穗对其茎、叶的淀粉和可溶性糖的利用,提高了处理部位的酚类物质含量和PPO活力;插穗留叶(1／4,2／4,3／4和1叶／节)4处理中,以留3／4叶最好,无叶插穗不生根,这与不留叶或少留叶(1／4叶)导致茎处理部位IAA水平降低以及叶供给的碳素营养水平不足有关;插穗的生理成熟度引起的生根率的差异可能与各枝段内IAA、ABA、总酚、PPO活力、淀粉和可溶性糖的差异有关。  相似文献   

乙脑病毒CN株PrM/E基因的克隆及序列分析   总被引：2，自引：0，他引：2  

汤德元  郭万柱  徐志文  颜其贵  王印  王晓玉 《四川农业大学学报》2004,22(3):252-256

通过RT -PCR扩增乙型脑炎病毒CN株主要抗原基因PrM /E ,并将PrM /E基因克隆、测序后 ,与GenbanK发表的JEVSA14 (U14 16 3)基因序列进行比较分析 ,发现CN株与JEVSA14强毒株的同源性为 98%。在JEV基因组 5′端 4 77～ 2 4 77的长 2 0 0 0nt的决定JEV抗原性的PrM /E区中 ,CN株与SA14株有 4 0个碱基不同 ,其中 2 8个碱基突变为同义突变 ,另外 12个为错义突变 ,导致相应的氨基酸序列 (6 6 6个 )中的 4个氨基酸发生了突变 ,其中有 2个氨基酸出现在含有关键的抗原决定簇的E蛋白内 ,但不影响其功能表达  相似文献   

不同生长环境赤松木材构造的变异   总被引：2，自引：2，他引：2  

金春德  吴义强  金顺泽  太万石  张美淑 《东北林业大学学报》2001,29(3):21-24

研究分析了不同生长环境下天然赤松木材生长轮宽度、晚材率、生长率、管胞长度，管胞长度频率分布、管胞宽度、管胞长宽比等木材构造的变异，结果表明，生长环境优越的林地天然赤松较生长环境差的林地生长速度快，生长轮宽，晚材率低，晚材管胞宽度明显宽，管胞长宽比两者接近，在一定生长轮范围内，管胞长度两者差异显著。  相似文献   

日本落叶松人工林生境质量的评价   总被引：3，自引：0，他引：3  

马友平  马家龙等 《华中农业大学学报》2001,20(1):73-76

通过对日本落叶松人工林的调查，在分析优势木高生长过程的基础上选择了Richards生长函数H＝a(1-e^-bA)^c作为优势高生长模型，标准年龄为20年，应用比例法编制了评价生境质量的立地位指数表。查立地指数表，指出立地指数相同的林分，将环境因子分解，画出林分优势高生长过程曲线，可直观的发现不同生境因子在其生长过程中的影响不一样，可更好地通过立地指数表动态的评价其生境质量的好坏。  相似文献