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1.
齐卡兔的产肉性能及部分品种特征的测定 总被引：4，自引：2，他引：2
对齐卡配套系兔产肉性能及部分品种特性的测定，显示该兔具备良好的产肉性能。在三个品系（Ｇ、Ｎ、Ｚ）中，Ｇ、Ｎ系兔产肉量和板皮厚度优于Ｚ系。成年Ｇ、Ｎ兔全净膛屠宰率５４％～５５％，肉骨比６．３～６．８：１，胴体长４５．５厘米。Ｇ、Ｎ系兔板皮重量占胴体的３２％以上。４月龄Ｎ、Ｚ系兔屠宰率４８％左右，肉骨比５．２６～５。７９：１，胴体长３６厘米。Ｇ系兔外貌最大特点为耳长大（１６～１８厘米），宽８～９厘米，体长４５～６０厘米，头围大（１８～２３．５厘米）。Ｎ系兔耳长１１．６～１３厘宋，耳宽６．６～７厘米，头围１８～２２厘米，体长４１～５０厘米。Ｚ系头型、体躯清秀，头围１７～２０厘米，体长４１～４８．５厘米。三个品系染色体核型都为２ｎ＝４４条，Ａｇ－ＮＯＲ定位于１３、１６、２０、２１号染色体上，Ａｇ－ＮＯＲ均数分别为Ｇ系４．０３、Ｎ系１．９５、Ｚ系２．９８。 相似文献
2.
颗粒细胞制备单层细胞时其浓度对牛早期胚胎体外发育的影响 总被引：10，自引：0，他引：10
应用颗粒细胞制备单层细胞时，将其浓度分为８组：６４×１０６、３２×１０６、１６×１０６、８×１０６、４×１０６、２×１０６、０．５×１０６、０个／ｍＬ，观察了不同浓度颗粒细胞对体外受精早期胚胎体外发育的影响。试验结果表明，制备单层细胞的适宜颗粒细胞浓度为（０．５～３２）×１０６个／ｍＬ，其中１６×１０６个／ｍＬ浓度组的囊胚率为４２．３±８．０％，明显高于对照组（２２．７±８．３％）及６４×１０６个／ｍＬ浓度组（２５．２±１２．Ｏ％）（Ｐ＜０．０１）。就发育速度和胚胎质量而言，该组胚胎的发育较快且质量较好，而且标准差反映批与批之间结果较为稳定，是理想的做单层浓度。 相似文献
3.
柠檬酸在仔猪饲料中的应用效果研究进展 总被引：4，自引：0，他引：4
柠檬酸（Ｃ６Ｈ８Ｏ７·Ｈ２Ｏ，分子量１９２１２）是白色结晶颗粒或无色柱状结晶，易溶于水及乙醇，难溶于乙醚。离解常数为７５×１０－４，具有很好的热稳定性和与金属离子的配位性。１％溶液ｐＨ值为２３，融点１５３℃，温度过高则成为无水物，有强酸味。目前... 相似文献
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商品肉兔杂交组合筛选试验 总被引：1，自引：0，他引：1
以比利时兔、丹麦白兔、新西兰白兔、加利福尼亚兔、中国白兔、大耳白兔为亲本，进行品种间杂交组合筛选试验。通过对６个亲本１２个杂交组合繁殖性能和育肥性能的配合力测定，筛选出中♂×加♀、新♂×加♀、丹♂×大♀、大♂×比♀４个杂交组合为较优组合。上述４个组合为肉兔多品种杂交配套系提供了素材。 相似文献
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试验为６（限饲方式）×２（性别）的完全随机设计，每处理组４个重复，每重复１５只鸡。６种限饲方式为：（１）Ｒｅｓ－０（自由采食）；（２）Ｒｅｓ－１（第７日龄禁饲） ；（３）Ｒｅｓ－２（第７、１４日龄禁饲） ；（４）Ｒｅｓ－３（第７、１４、２１日龄禁饲） ；（５）Ｒｅｓ－４（第７、１４、２１、２８日龄禁饲）；（６）Ｒｅｓ－５（第７、１４、２１、２８、３５日龄禁饲）。禁饲指停饲２４ ｈ。结果４２日龄时处理１、２、３组间鸡体重无显著差异，但第４、５、６处理组体重明显低于１、２、３处理组（Ｐ＜ ０．０５）… 相似文献
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采用中国科学院遗传研究所研制的A、B、C三个系统12个血型因子,分析滨白鸡7个纯系和5个杂交组合的种群关系。结果表明,12个群体可分为5个类。第一类包括5个纯系(No2、No7、No6、No3、No8)和2个杂交组合(5×2,7×8)。第二类包括5×6组合和No5系。第三类是4×2组合。第四类是5×4组合。第五类是No4系。不同类品系间遗传差异大,同一类品系则小。实际配合力测定得到的4×2.5×42.6×42优秀杂交组合均有一定的理论基础。 相似文献
8.
将１２只摘除卵巢后６～７周的山羊随机分为４组，按２×２因子实验设计进行处理。实验因子为：（１）肌肉注射孕酮（Ｐ４）：第１～５ｄ每天１０ｍｇ；第６～１２ｄ每天２０ｍｇ。（２）肌肉注射雌二醇（Ｅ２）：第１３ｄ２０μｇ第１４ｄ４０μｇ。对照处理则注射相应体积的玉米油。在第１５ｄ上午，给实验羊安置后腔静脉导管。经颈静脉给每只山羊注射１０Ｕ催产素（ＯＴ）。在注射ＯＴ前后经导管采１２份血样：─３０，─１０，─５，０，２，５，１０，１５，２０，３０，４５和６０ｍｉｎ时采样。用ＲＩＡ方法测定每份血样中的前列腺素Ｆ２α（ＰＧＦ２α）水平。在注射ＯＴ之前和注射后的４５和６０ｍｉｎ，血浆ＰＧＦ２α处于基础水平，各组间的差异不显著（Ｐ＞０．０５）。在注射ＯＴ后的２～３０ｍｉｎ，Ｐ４＋Ｅ２组的ＰＧＦ２α水平极显著地高于其他３组（Ｐ＜０．０１），其他３组之间的ＰＧＦ２α水平差异不显著（Ｐ＞０．０５）。Ｅ２组在注射ＯＴ之后也有明显的ＰＧＦ２α分泌活动。结果表明，山羊经用Ｅ２或用Ｐ４和Ｅ２先后处理后，ＯＴ可以引起子宫分泌ＰＧＦ２α。 相似文献
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２、奶牛繁殖现状统计表填写说明（１）预产月从左至右由近及远填写，第１格填写统计当月，如１９９６年１０、１１、１２、１９９７年１、２、３、４、５月。（２）实产月从上到下由近及远填写，第１格填统计时的上月，如：１９９６年９、８、７、６、５、４、３、２、１... 相似文献
10.
杂交组合提高肉牛生产能力的效果研究 总被引：2，自引：1，他引：1
在非科尔沁牛育种区选择饲养条件好，冷配基础好和五个牧场，进行不同杂交组合生产性能的研究，并地加系ｘ西杂这一组合的生产性能做了全面的测定分析，研究发现，另系ｘ西杂牛后代公牛６月龄、１２月龄、１８月龄、２４月龄的体重分别为１６３．４，２５６．７，３７３．８和５００．１ｋｇ，该杂交组合后裔５５０天平均日增重的杂咎优势率为１７．４％，加系西牛ｘ加重西牛后代５５０天平均日增重是所有组合中最高的为０．７０６ｋ 相似文献
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Rassnick KM Gieger TL Williams LE Ruslander DM Northrup NC Kristal O Myers NC Moore AS 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2001,15(3):196-199
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
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Davis MS Willard MD Nelson SL Mandsager RE McKiernan BS Mansell JK Lehenbauer TW 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(3):311-314
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
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Furosemide continuous rate infusion in the horse: evaluation of enhanced efficacy and reduced side effects 总被引：1，自引：0，他引：1
Johansson AM Gardner SY Levine JF Papich MG LaFevers DH Fuquay LR Reagan VH Atkins CE 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(6):887-895
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
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Waruiru RM Thamsborg SM Nansen P Kyvsgaard NC Bogh HO Munyua WK Gathuma JM 《Tropical animal health and production》2001,33(3):173-187
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
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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
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Evaluation of biohydrogenation rate of canola vs. soya bean seeds as unsaturated fatty acids sources for ruminants in situ 
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下载免费PDF全文 S. Pashaei T. Ghoorchi A. Yamchi 《Journal of animal physiology and animal nutrition》2016,100(2):211-216
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
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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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正We are pleased to publish the second special issue on avian brood parasitism and to be responsible guest editors for the two special issues of Chinese Birds (Vol. 3, No. 4, 2012 and Vol. 4, No. 1, 2013), entitled "Avian Brood Parasitism - A Growing Research Area in Behavioral Ecology". The first issue was published in December 2012. The goal of the two special issues is to publish accumulated knowledge and some of the recent developments in 相似文献
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Tropical Animal Health and Production - 相似文献