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Summary. Tracer studies using single drops of solutions containing 3–amino-1,2,4–triazole-5–14 C (aminotriazole-14 C) or 2,2–dichloropropionic acid-2–14 C (datapon-14 C) revealed that in couch plants (Agropyron repens (L.) Beauv.) growing under field conditions in the autumn and at the stage where the aerial shoots were 40–50 cm long, both compounds moved in both symplast and apoplast. Dalapon was less mobile in the symplast than aminotriazole and only negligible amounts of dalapon were translocated to the rhizomes. The nodes of the treated shoots appeared to act as barriers to translocation, a phenomenon more pronounced for dalapon than for aminotriazole.
Application to a basal green leaf led to a more uniform distribution of the compounds within plants and rhizomes than when the application was made to the youngest fully-expanded leaf.
In couch plants with aerial shoots 10–15 cm long treated in the stubble, the distribution of both aminotriazole and dalapon was mainly restricted to the treated shoots. Even 15 days after application only trace amounts of radioactivity could be found in the rhizomes and untreated shoots. 相似文献
Application to a basal green leaf led to a more uniform distribution of the compounds within plants and rhizomes than when the application was made to the youngest fully-expanded leaf.
In couch plants with aerial shoots 10–15 cm long treated in the stubble, the distribution of both aminotriazole and dalapon was mainly restricted to the treated shoots. Even 15 days after application only trace amounts of radioactivity could be found in the rhizomes and untreated shoots. 相似文献
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S.E. Abdelgadir J.R. Jaeger J.E. Oldfield L.H. Appell F. Stormshak 《Domestic animal endocrinology》1994,11(4):349-354
Two experiments were conducted to study the effects of cycloheximide and colchicine on prostaglandin F2 (PGF2)-induced secretion and synthesis of oxytocin in bovine luteal tissue in vitro. Corpora lutea were collected from beef heifers on Day 8 of the estrous cycle. In Experiment 1, incorporation of [14C]-leucine into oxytocin synthesized and secreted by luteal slices after exposure to PGF2, cycloheximide and cycloheximide plus PGF2 was examined. In Experiment 2, synthesis and secretion of oxytocin were evaluated in luteal slices incubated with colchicine and PGF2 alone and in combination. Cycloheximide inhibited incorporation of labeled leucine into luteal proteins by more than 90% and no labeled oxytocin was detected in the media or tissue. Prostaglandin F2 induced significant secretion of oxytocin that was not inhibited by cycloheximide. Tissue levels of oxytocin after incubation with cycloheximide and/or PGF2 did not differ and were similar to those of the incubated control. Colchicine alone did not suppress oxytocin secretion and did not alter the ability of PGF2 to induce significant secretion of this nonapeptide. Tissue concentrations of oxytocin after incubation with colchicine and/or PGF2 did not differ. These studies indicate that secretion and replenishment of luteal oxytocin in vitro is not contingent upon de novo protein synthesis. Inability of colchicine to suppress oxytocin secretion and synthesis may have been due to the short duration of exposure of luteal tissue to the drug. 相似文献
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Associations of Leptin and Pituitary‐Specific Transcription Factor Genes’ Polymorphisms with Reproduction and Production Traits in Dairy Buffalo 下载免费PDF全文
This study aimed to detect the genetic variability in Leptin and Pit‐1 genes using polymerase chain reaction–restriction fragment length polymorphism and DNA sequencing also to explore their possible associations with reproductive and productive traits of Egyptian buffaloes. Regarding Leptin gene, three genotypes (AA, AG and GG) were identified with frequency of 0.54, 0.40 and 0.06, respectively, and the genotypes were distributed according to the Hardy–Weinberg equilibrium. Allele A was comparatively higher than G with frequency of 0.74 and 0.26, respectively. For Pit‐1 gene, the association could not be performed due to the monomorphism (BB). The results showed that AA genotypes were found to be superior in most of production and reproduction traits. AA genotypes yielded more milk (2332.34 kg, p = 0.04) with higher fat% (6.10, p = 0.004) and fat yield (155.75 kg, p = 0.06), reach peak milk production at 42.19 days and required 2.19 services for conception in comparison with GG genotypes. Birthweight of animals with AA genotype was lesser than with GG genotype (39.35 and 43.67 kg, p = 0.02, respectively). The days open is numerically better in AA genotype animals (99.35 days), but the difference between the three genotypes was non‐significant. The distinct significant associations reported in this study suggested that Leptin is reputable candidate genetic marker, which might be used to enhance animals’ genetic potential for milk production in conjunction with reproduction. 相似文献
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Atlantic salmon ( Salmo salar L.) fry were reared on a fishmeal-based diet with three different levels of vitamin D3 (0.2, 5 and 57 mg vitamin D3 kg–1 feed, ww) from first-feeding for 14 weeks. No significant differences were recorded in weight, length, specific growth rate, mortality, or kidney calcium concentration between the different dietary groups. No skeletal malformations or histopathological changes were recorded in any of the dietary groups. These results suggest Atlantic salmon fry to be highly tolerant of megadoses of vitamin D3 over a limited period of time. 相似文献
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Abdelgadir Musaad Bernard Faye Abdelmoneim Abu Nikhela 《Tropical animal health and production》2013,45(4):1039-1046
Weekly milk records of 47 she-camels in a multibreed dairy camel herd were collected for over a period of 5 years. A total of 72 lactation curves were defined, and relationships with parity, calving season, lactation length, milk production level, following lactations, and dam weight were analyzed. Overall mean values were milk yield up to 12 months, 1,970?±?790 l; lactation length, 12.5 months; persistency, 94.7 %; weekly peak yield, 50.7 l; monthly peak yield, 220?±?90 l; and the number of weeks to reach peak yield, 28. The highest productivity was recorded in summer with a weekly mean of 48.2?±?19.4 l, compared with 34.1?±?16.3 l in winter. The highest average yield recorded was for camels at sixth parity, whereas the highest weekly peak was at eighth parity, and highest persistency at fifth parity. Camels that calved during the cold months (November to February) were most productives, with the highest persistency, peak yield, and longest lactation length. Four types of curves were identified corresponding to different parities and milk yield levels. Based on these data, specific models for camels are proposed. 相似文献
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纪念性景观是城市绿地的重要组成部分,其地被植物的配置具有明显的景观特色。通过对典型纪念性景观——南京市雨花台风景区的地被植物的种类、生活型分类、应用方式、平面布置形式及应用分类进行调查,并对其配置进行分析探讨,提出了加大对乡土和野生地被植物资源开发力度、科学引入外地优良的地被植物、增加地被植物的配置艺术性以及提高植被养护管理水平等建议。 相似文献
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Mathis CP Cochran RC Heldt JS Woods BC Abdelgadir IE Olson KC Titgemeyer EC Vanzant ES 《Journal of animal science》2000,78(1):224-232
Three independent experiments were conducted each using 16 ruminally fistulated beef steers fed bermudagrass (8.2% CP, 71% NDF; Exp. 1), bromegrass (5.9% CP, 65% NDF; Exp. 2), or forage sorghum (4.3% CP, 60% NDF; Exp. 3) hays to evaluate the effects of increasing level of supplemental degradable intake protein (DIP) on forage utilization. In each experiment, steers were blocked by weight and assigned to one of four treatments, and hay was offered to each steer at 130% of average voluntary intake for the preceding 5-d period. Supplemental DIP (sodium caseinate) was placed in the rumen at 0700, immediately before feeding forage. Levels of DIP supplementation were .041, .082, and .124% BW; the control received no supplemental DIP. Following a 10-d adaptation, intake and total fecal output were measured for 7 d. In Exp. 1, neither forage OM intake (FOMI) nor fiber (NDF) digestion were influenced (P > or = .20) by increasing level of DIP supplementation. The DIP supplied by the bermudagrass hay was estimated to be 8.2% of the total digestible OM intake (TDOMI) for control steers. In Exp. 2, increasing level of supplemental DIP did not affect (P > or = .26) FOMI but tended to increase total OM intake linearly (TOMI; P = .10). The tendency for a rise in TOMI coupled with a slight numeric increase in digestion resulted in an increase (linear; P = .06) in TDOMI. In the treatment group in which the maximum TDOMI was observed (supplemental DIP treatment of .082% BW), total DIP intake constituted approximately 9.8% of the TDOMI. In Exp. 3, FOMI, TOMI, organic matter digestion (OMD), and TDOMI were improved (P < .01) by increasing amounts of supplemental DIP. Although there was some evidence of a tendency for a decrease in the magnitude of change in TDOMI in response to increasing DIP supplementation, a clear plateau was not achieved with the levels of supplement provided. When the highest level of supplemental DIP was fed, DIP constituted approximately 12.8% of the TDOMI. In conclusion, significant variation was observed among forage in the amount of DIP needed to maximize intake and digestion when expressed in relationship to the digestible OM. 相似文献
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C A Cosola-Smith L H Appell S E Abdelgadir F Stormshak 《Journal of animal science》1990,68(8):2465-2470
Experiments were conducted to examine the in vitro effects of a phorbol ester and a calcium ionophore on bovine luteal oxytocin (OT) secretion and synthesis and progesterone secretion. Corpora lutea removed from beef heifers on d 8 of an estrous cycle were sliced and incubated for 2 h with .81 nM 12-O-tetradecanoylphorbol-13-acetate (TPA), 1.62 nM TPA or .3 microM calcium ionophore A23187. Both concentrations of TPA increased (P less than .01) OT secretion (ng.g-1.2 h-1; control, 407.1; .81 nM TPA, 494.7; 1.62 nM TPA, 528.1; SE = 21.2). Increased secretion of OT was accompanied by a corresponding increase (P less than .02) in synthesis of the hormone (ng.g-1.2 h-1; control, 368.5; .81 nM TPA, 427.6; 1.62 nM TPA, 492.1; SE = 25.7). Phorbol ester also induced (P less than .025) progesterone secretion (ng.g-1.2 h-1; control, 1,056.2 vs .81 nM TPA, 1,333.3; SE = 86.4). Calcium ionophore increased (P less than .01) OT secretion (ng.g-1.2 h-1; control, 248.9 vs A23187, 327.4; SE = 16) and there was a trend (P = .09) toward increased synthesis of OT in response to the ionophore (control, 124.4 vs A23187, 165.6; SE = 16.4). Because TPA can activate protein kinase C and A23187 increases intracellular calcium, these intracellular constituents probably are involved in promoting secretion of OT and progesterone. 相似文献