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1.
在室内气温５ ～２０℃条件下， 对２０ 只７～８ 周龄樱桃谷鸭肥肝生产性能进行了试验研究。结果表明填肥期增重７７ ．６％ ，产肝率１００％ ，最大肝重４４０ｇ，平均肝重３２５．５ｇ ，肝料比１∶２４．９７，高于国内公认产肝品种番鸭２８１．８ｇ 的水平。  相似文献   

2.
本试验选择６０天龄淘汰鸭、９０天龄后备鸭、４７天龄商品鸭各８０只，经过１４天填饲后测定各组的肥肝性能。结果表明，淘汰鸭组肝均重３６９．３ｇ，后备鸭组为３３８．４ｇ，商品鸭为３１４．７ｇ，３个组的料肝比分别为３１．４６：１，２７．０７：１，２６．４１：１，肝重占体重分别为６．９３％、７．２６％、７．６４％，最大肝重达６８０ｇ，试期内伤残淘汰率为１．２５％。  相似文献   

3.
EM菌液在鹅肥肝填饲生产中的应用实验研究   总被引：3，自引：0，他引：3  
德莱鹅业有限公司首次进行了EM菌的填饲肥肝试验。结果证明,使用EM菌实验组朗德鹅的平均肥肝重、肝料比以及600g重以上的特级肥肝比例等重要经济技术指标,均显著高于常规试验组。而且两组的增重率极其相近．但平均肥肝重却比常规组高出11．1％。  相似文献   

4.
经调查发现云南会泽新街乡肉牛感染肝片吸虫和线虫较为严重，用丙硫苯咪唑驱虫１个月后，每１００ｇ粪便的虫卵数平均从４．５４个下降到０．７８个。通过对３２头１２～２５月龄生长牛和３０头２岁以上育肥牛的试验表明，驱虫使１２～２５月龄生长牛的日干物质采食量（ＤＭＩ）从５．３５ｋｇ提高到７．０６ｋｇ，平均日增重（ＡＤＧ）从４４３ｇ提高到６３７ｇ，２岁以上育肥牛ＤＭＩ从５．９５ｋｇ提高到６．９９ｋｇ，ＡＤＧ从５９８ｇ提高到７０３ｇ。驱虫使生长牛和育肥牛的单位增重的饲料消耗平均降低了８．３９％，但对各项生理指标无明显影响。  相似文献   

5.
２－６月龄、６－１２月龄、１２－２５月龄和２岁以上云南黄牛的日干物质采食量分别为４．０６、４．５９、５．６９和６．１１ｋｇ,而杂交牛分别为４．５７、５．８９、６．９０和７．０４ｋｇ,平均比云南黄牛高１．０ｋｇ,提高了１９．３２％;云南共牛的日增重分别为２９９、３８４、３９９和５７３ｇ,而杂交牛分别为５１６、５４６、５５８和７７１ｇ,平均比云南黄牛高１８５ｇ,提高了４６．６３％,杂交牛１ｋｇ增重的饲  相似文献   

6.
海藻作饲料添加剂饲喂产蛋鸡的效果   总被引：2，自引：0，他引：2  
用６００只产蛋鸡分四组进行了６７ｄ饲养实验,考察海藻粉（ＳＭ）的效果。结果表明：ＳＭ组试鸡产蛋率与商品添加剂组和Ｋ１组比差异显著（Ｐ＜０．０５）,与未加ＳＭ组比差异不显著（Ｐ＞０．０５）。蛋重比其他三组高０．４～１．５ｇ／枚,饲料转化率高６．４％、７．６％和低０．７６％;试期４～２７ｄ,ＳＭ组蛋黄的碘含量由９．４ｕｇ／ｇ增加到６６．８ｕｇ／ｇ（鲜样）。至２７ｄ达到高值,比未加ＳＭ和ＫＩ组高达８．４和５．２倍。蛋白含碘亦由０增加到８．７ｕｇ／ｇ;蛋黄色素变化随着饲养期延长而加深,至２７ｄ达到９个评分等级,比未加ＳＭ和ＫＩ组高２．７和１．５个等级;此外还发现ＳＭ中的碘比ＫＩ中的碘更稳定,两种日粮同时保存５２ｄ,前者损失５９％（碘由８０．４×１０－６降至３２．７×１０－６）,后者损失７６．５４％（碘由８０×１０－６降至１８．７７×１０－６）。  相似文献   

7.
樱桃谷鸭增重和饲料转化规律的研究   总被引：3，自引：0，他引：3  
樱桃谷鸭在适宜的饲养管理条件下可达较高的生产性能,７周龄平均体重３６３７．９ｇ,饲料转化比２．４６。平均日增重５周龄前逐渐上升,５周龄达到最大,为９７．６ｇ,５周龄以后增重速度迅速降低,７周龄平均只有５５．１ｇ。公鸭前两周增重速度比母鸭慢,第３周龄起超过母鸭。累计饲料转化比随周龄增加呈逐渐增加的趋势,而各周龄饲料转化比在５周龄以后迅速增加,从第５周龄的２．４０上升到第７周龄的４．８７。但将饲料转化比换算成瘦肉饲料比,７周龄（１２．４７∶１）好于６周龄（１３．６２∶１）。７周龄的屠宰性能显著好于６周龄,尤其是胸肉率达到１５．１％,比６周龄（１１．３％）提高了３．８个百分点。  相似文献   

8.
初产母猪繁殖性能低的因素分析   总被引：3，自引：0，他引：3  
初产母猪因繁殖障碍常致繁殖力低下，且所产仔的死淘率明显高于经产母猪。据统计，初产母猪窝均产仔数比经产猪少２１．５％，弱仔产出率高１．７倍，产死仔率高１．５倍，流产死胎率１８．６％，比经产猪多３倍。仔猪增重效果低３０％，情期受胎率低１９．６％。１影响初产母猪繁殖性能的因素１．１初配过早初配过早，体、性成熟不同步，恶果是产仔少，死胎多，体质弱，初生重小，成活率低，生长缓慢。也使母猪发育不良，未老先衰，将直接影响后代的生产力。１．２母猪过肥或过瘦初产母猪过肥，使子宫周围沉积大量脂肪而影响子宫的生理功能…  相似文献   

9.
独山黑猪是贵州地方猪种之一,为了了解该猪繁殖性能,采取解剖公母猪生殖器官,测定不同月龄公母猪生殖器官生长发育情况,并与长白猪进行比较,独山黑猪２,４,６月龄卵巢重０．４２ｇ,１．５ｇ,６．２５ｇ,长白猪２,４,６月龄卵巢重１．２５ｇ,２．６５ｇ,４．３０,６月龄独山黑猪卵巢比长白猪重１．６７ｇ;成熟儿泡数６月龄独山黑猪达１４．６个,长白猪尚无。  相似文献   

10.
对６０只产蛋率下降至１０％,产蛋近８个月的种用乌骨鸡施行饥饿强制换羽。在室温一直保持１８～２０℃条件下,停食１６ｄ,停水３ｄ,致使乌骨鸡的体重由最初１２９９２９ｇ下降至９９８６ｇ,体重下降率为２３２６％,强制换羽２５个月后,成活率为１００％,淘汰率为１７％（１／６０）。乌骨鸡强制换羽后第１０～１６ｄ,躯体小羽大量脱落,并逐渐换上新的洁白羽毛,强制换羽第１７天以后,除继续脱落小羽毛外,尚可见到零星的轴羽或个别的主翼羽。强制换羽第２５～６０ｄ为大批主翼羽脱落期,当强制换羽后产蛋率恢复２８％以上时,主翼脱落达６０％以上。  相似文献   

11.
1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks.  相似文献   

12.
Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large.  相似文献   

13.
Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses.  相似文献   

14.
Tropical Animal Health and Production -  相似文献   

15.
The epidemiology of H. placei and of other gastrointestinal nematodes in yearling dairy cattle was examined on two farms in Kiambu District, central Kenya during each of 13 one-month periods from April 1993 to April 1994. On each farm, 32 newly weaned dairy calves were given a single dose of albendazole and then placed on experimental pastures. Twelve of the animals were designated for bi-monthly slaughter (n = 2) and analysis of worm population characteristics and 20 were designated for blood and faecal collection and for weighing. Two parasite-free tracer calves were grazed alongside the weaner calves each month throughout the study period and were also slaughtered for analysis of worm populations. Faecal egg counts, haematological and serum pepsinogen determinations, herbage larval counts, and animal live weight changes were recorded monthly. The study revealed that Haemonchus placei, Trichostrongylus axei, Cooperia spp. and Oesophagostomum radiatum were responsible for parasitic gastroenteritis and that H. placei was the predominant nematode present in the young cattle on both farms. Faecal egg counts from resident cattle and necropsy worm counts revealed that pasture larval levels were directly related to the amount of rainfall. The total worm burdens in the animals were highest during the rainy season (March–June and October–December) and lowest during the dry seasons (July–September and January–February). The very low recovery of immature larvae of H. placei from the tracer calves indicated that arrested development is not a feature of the life cycle of this parasite in central Kenya. The maintenance of the parasite population depended on continuous cycling of infection between the host and the pasture. The agroclimatic conditions of the study area were such that, in general, favourable weather conditions for the development and survival of the free-living stages of gastrointestinal nematodes existed all year round.  相似文献   

16.
The occurrence of ectoparasites in sheep flocks is frequently reported but seldom quantified. Sheep production used to be a predominantly family activity in the state of Sa~o Paulo (Brazil), but it began to become a commercial activity in the past decade. Thus, information about the ectoparasites existing in sheep flocks has become necessary. The present data were obtained by means of questionnaires sent to all sheep breeders belonging to the `Associaça~o Paulista de Criadores de Ovinos' (ASPACO; Sa~o Paulo State Association of Sheep Breeders). Response reliability was tested by means of random visits paid to 10.6% of the respondents. Most of the properties (89.5%) reported the presence of one or more ectoparasites. Screw-worm (Cochliomyia hominivorax) was the most frequent ectoparasite (72.5%), followed by bot fly larvae (Dermatobia hominis, 45.0%), ticks (Amblyomma cajennense) and Boophilus microplus, 31.3%) and finally lice (Damalinia ovis, 13.8%). Combined infestations also occurred, the most common one being screw-worm with bot fly larvae (36.0%) followed by bot fly larvae with ticks (13.9%), screw-worm with ticks (9.3%), bot fly larvae with lice (6.9%), and ticks with lice (5.0%). The most common triple combination was screw-worm, bot fly larvae and ticks (12.8%). Breeds raised for meat or wool were attacked by bot fly larvae and ticks more often than other breeds. Lice were only absent from animals of indigenous breeds. The relationships among these ectoparasites are discussed in terms of sheep breeds, flock size, seasonality and the ectoparasitic combinations on the host.  相似文献   

17.
Our particular attention in this article was given to natural mediators for macrophages isolated from the sites of tissue injury. A number of chemotactic factors, which may satisfy many criteria making them acceptable as inflammatory leucocyte chemotactic factors, has been separated. Among them, our laboratory has isolated three macrophage (monocyte) chemotactic factors (MCF-a, -b and -c). Their purification, characterization and functional specificity are discussed.  相似文献   

18.
Comparison of different tests to diagnose feline infectious peritonitis   总被引：1，自引：0，他引：1  
  相似文献   

19.
An experiment was conducted to study disappearance of C14 to C18 fatty acids, lag times and biohydrogenation (BH) rates of C18 fatty acids of ground soya bean and canola seeds in situ. Three ruminally fistulated Dallagh sheep were used to determine ruminal BH of unsaturated fatty acids (UFAs). Differences in the disappearance of fatty acids through the bags and lag times were observed between the oilseeds. We saw that the longer the incubation time of the oilseeds in the rumen, the lower the content of C18:2 and C18:3. Significantly higher lag times for both C18:2 and C18:3 were observed in ground canola compared to ground soya bean. BH rates of C18:2 and C18:3 fatty acids in soya bean were three times higher than those of canola. These results suggest that the fatty acid profile of fat source can affect the BH of UFAs by rumen micro‐organisms. So that UFAs of canola had higher ability to escape from ruminal BH. It seems that fatty acid profile of ruminant products is more affected by canola seed compared to soya bean seed.  相似文献   

20.
Serum biochemical values and the wet weight to dry weight ratios of tissues were determined in yaks in Shandan county of Gansu province. The liver, kidney, heart and muscle contents of seven elements in yaks were also analysed. Most serum biochemical values were similar to those of cattle, camels and sheep, but the calcium concentration was considerably above the normal range for other ruminants. The liver contained the highest concentrations of copper, manganese and cobalt and the kidney of selenium, iron and calcium.Abbreviations Alb albumin - ALT alanine aminotransferase - AST aspartate aminotransferase - BUN blood urea nitrogen - Chol cholesterol - Glob globulin - -GT -glutamyl transpeptidase - IP inorganic phosphorus - TP total protein  相似文献   

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