Energy Metabolism During Late Gestation and Lactation in Muciparous Sows in Relation to Backfat Thickness and the Interval from Weaning to First Oestrus     

&#x;. Hultn  M. Neil  S. Einarsson  J. Hkansson 《Acta veterinaria Scandinavica》1993,34(1):9

Ten crossbred, fourth or fifth parity sows were divided into 2 groups - high (H) and low (L) - according to their backfat thickness 9 days before parturition. Body weight, backfat thickness and litter weight were recorded repeatedly during a 5 week lactation period. The length of the interval from weaning to first oestrus was also noted. All sows were fed a commercial diet (11.9 MJ/kg, 14.5% crude protein). During gestation, daily food intake was 2.2 kg/sow, while during lactation it was 3.0 kg/sow plus 0.4 kg/piglet.Blood samples were drawn on day 9 before parturition and on days 2,7,14 and 21 of lactation. The samples were analysed to determine concentrations of glucose, urea nitrogen, creatinine, triglycerides, free fatty acids and beta-hydroxybutyric acid. In both groups, concentrations of free fatty acids and urea nitrogen were low on day 9 before parturition while those of triglycerides were high, indicating anabolism regardless of backfat thickness.During the first week of lactation, concentrations of free fatty acids increased in the H-group but not in the L-group, and concentrations of urea nitrogen were higher in the H-group. These differences, together with the greater loss of weight observed in the H-group, indicate that catabolism of maternal fat and protein depots was more pronounced in the Η-group than in the L-group during this time. On day 14 of lactation, both groups showed equally low concentrations of free fatty acids, decreasing creatinine concentrations and stable triglyceride and urea nitrogen concentrations. Furthermore, weight loss during the second and third weeks of lactation was low in both groups. These facts, taken together, indicate that the catabolic rate was decreasing in both groups during this period. No differences in return to oestrus interval were noted between the groups. The present study indicates that under a restricted feeding regime the catabolic rate during the first week of lactation is higher in sows with higher backfat thickness in late gestation.As lactation progresses, a more balanced metabolism is achieved regardless of backfat thickness, which may tend to reduce differences in return to oestrous interval.  相似文献   

Changes of histochemical profiles of myofibers in pectoralis and supracoracoideus fasciculi induced by breeding for large or small body size in Japanese quails     

Hisao IWAMOTO  Takafumi GOTOH  Shoji TABATA  Shotaro NISHIMURA  Satoru OKAMOTO 《Animal Science Journal》2003,74(2):111-118

The histochemical profiles of myofibers in Musculus pectoralis (PT) and M. supracoracoideus (SC) fasciculi were compared among Japanese quail strains with large, normal and small body sizes. In male and female adults, both the PT and SC muscles had attained a 2.5–2.7-fold weight gain in the large strain and conversely a 0.43–0.50-fold change in the small strain relative to those of the normal size. The muscles were composed of fasciculi with a central cluster of type IIA fibers surrounded by a peripheral layer of type IIB fibers. In the large strain, the cross sectional area (CSA) of the fasciculus and CSA of the fibers in each type were significantly enlarged compared with those in the normal size, with the exception of the fasciculus in the deep region of the male PT muscle. The hypertrophied type IIA fibers in the large strain showed considerable variation in nicotinamide adenine dinucleotide dehydrogenase activity, some of which might represent a transitional form into type IIB fibers. In the small strain, the fasciculus CSA did not significantly differ from that of the normal size except for the PT surface region of the male. However, fiber atrophy was observed in type IIB fibers of the PT surface region in both sexes, and type IIA fibers of the PT deep region and SC muscle in the small strain male quails. The relative fiber type composition of a fasciculus in each region showed only a slight change across the strains. These results indicate that breast muscle hypertrophy in the large strain could be based mainly on fasciculus and fiber hypertrophy, but muscle atrophy in the small strain is not induced by fasciculus and fiber atrophy.  相似文献   

丝羽乌骨鸡快大型新品系早期生长发育规律的研究   总被引：8，自引：0，他引：8  

周海龙  朱庆 《四川畜牧兽医》2003,30(10):29-29,32

本试验对丝羽鸟骨鸡快大型新品系的早期生长发育规律及肉用性能进行了系统的研究。利用Logistic模型确定了快大型新品系丝羽乌骨鸡的生长模型，并以此制定了标准生长曲线。研究结果表明，其生长拐点为：10．5周龄：在14周龄时体重约1．0kg，为较适合的上市日龄，  相似文献   

共轭亚油酸对动物脂肪沉积的影响     

李影龙火生  李艳杰杨公社 《家畜生态》2003,24(2):52-54

共轭亚油酸(CLA)是亚油酸的一组构象和位置异构体，因其多种生物学功能而日益引起多方关注，目前已发现CLA具有降低体脂沉积的作用，使之成为了国内外学者关注的焦点。本文就CLA对动物脂肪沉积的影响作一综述。  相似文献   

半胱胺对育成期银狐生长性能的影响     

王忠艳  马建章 《中国畜牧兽医》2007,34(1):5-8

为研究半胱胺对育成期银狐生长性能的影响，选用2月龄左右、健康银黑狐仔狐224只（公母各半）。其中公狐体重在2.50 kg左右（P＞0.05），母狐体重在2.10 kg左右（P＞0.05）。随机分200只（公母各半）为试验组，剩余24只（公母各半）为对照组。饲养试验持续时间大约为3个月（2004年6月10日~8月31日）。采用复因子试验设计中的析因试验设计，为二因子有重复的试验设计。在5个不同半胱胺添加时间间隔（1、3、5、7和9 d）中分别添加5个不同数量的半胱胺（每千克体重添加10、40、70、100和130 mg）。对照组分为12个重复，每个重复2只（公母各半）。试验测定了银狐的采食量、饲料转化率及体增重。结果表明，在25个组合中只有每间隔5 d按70 mg/ kg体重浓度添加1次半胱胺组可使银狐体增重及饲料转化率达到最高,分别比对照组提高15.08%（P＜0.05）和20.21%（P＜0.01）。整个试验组银狐采食量都低于对照组, 其中70 mg/kg体重5 d组采食量比对照组降低4.52%( P＜0.05）。  相似文献   

蚕体蚕座消毒剂"蚕座菌毒净"的研究   总被引：1，自引：1，他引：0  

王彦文  牟志美  李卫国  崔为正  殷培伟 《河北林果研究》1999,14(4):1

新型蚕体蚕座消毒剂“蚕座菌毒净”配合新鲜石灰粉,对家蚕四大传染性蚕病均有较好的控制作用,尤其是对真菌病原有显著的消毒效果。试验结果表明,该药对蚕的生长发育及茧质无不良影响,是一种高效、低毒、稳定、无刺激性的新型蚕体蚕座消毒剂。  相似文献   

甜菊实生苗春栽丰产模式初探     

孟庆福  王天顺 《河北农业大学学报》1998,21(1):12-15

应用田间正交试验，探索甜菊实生苗春季的丰产模式，实现了多种增产因素的优化配置。在中肥力轻壤质潮土、汕菜掩青、满足水肥供应条件下，栽培“邯选１号”甜菊实生苗，２．８万株６６７ｍ＾２、４密１稀，开沟定植，地膜覆盖、２捋１割为最佳组合，干叶产量可达４３６ｋｇ／６６７ｍ＾２。该模式可供１ａ生类型区春栽甜菊实生苗时参考。  相似文献   

18月龄苏尼特羯羊体尺、体重与产肉力的通径分析     

《内蒙古农业大学学报(自然科学版)》1998,(1)

  相似文献   

Monokaryons Fruiting and Fruit body color of Flammulina velutipes     

YI Ruirong    CAO Hui  PAN Yingjie College of Life Sciences  Nanjing Agricultural University  Nanjing  Jiangsu  China 《食用菌学报》2007,(2)

Thirteen kinds of yellow and three kinds of white monokaryons were isolated from mycelium of eight Flammulina velutipes strains using the monokaryon protoplast technique. Of these, five yellow and two white monokaryons produced monokaryotic fruit bodies. Clear differences were observed in the color of the different yellow monokaryotic fruit bodies, as well as between the pilei and stipes of individual yellow monokaryotic fruit bodies, suggesting that the yellow color is under the control of multiple alleles.  相似文献   

蝴蝶兰类原球茎玻璃化产生的原因及恢复效果研究   总被引：2，自引：1，他引：2  

顾德峰  刘喆  宋彦君  赵春莉  王奇 《北方园艺》2007,(8):183-185

对蝴蝶兰(Phalaenopsis)组培生产中引起类原球茎玻璃化的原因以及玻璃化类原球茎再利用的效果进行了研究.结果表明,随着植物生长调节剂浓度增高和继代培养的时间延长,类原球茎玻璃化程度加重.当NAA浓度为5 mg/L、BA浓度为10 mg/L,继代培养到第9代时,2种培养基中玻璃化率分别高达71%和65%.玻璃化类原球茎的平均增殖率仅为2.2,再生植株率为183株/瓶,明显低于正常类原球茎的5.3和1 297株/瓶.玻璃化类原球茎在无植物生长调节剂培养基中经2～3代恢复培养后,数量下降到0.84%,玻璃化现象可得到明显恢复,恢复后的类原球茎的分化能力和植株生长状态与正常类原球茎一致,无变异现象发生,可继续应用于组培生产.  相似文献