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1.
西夏本三元杂交牛生长发育研究   总被引：1，自引：0，他引：1  
测定、分析了西夏本三元杂交牛（公４１头、母３５头）、西黄Ｆ１（公３４头、母３４头）和豫北黄牛（公３４头，母３８头）初生－２４月龄体尺、体重生长发育，结果表明，西夏本杂种牛生长发育快，各月龄体尺、体重显著大于豫北黄牛，比西黄Ｆ１也有明显提高，利用三元杂交进行肉牛生产是一条有效途径。  相似文献   

2.
测定、分析了两种三元杂交组合(本夏利F_2:公32头,母30头;本夏西F_2:公母各32头)与豫北黄牛初生——24月龄体重与体尺生长发育。结果表明,三元杂交肉牛生长发育快,体重与体尺在各个月龄下均较本地黄牛有较大幅度提高。利用三元杂交进行肉牛生产是一条有效的途径。两种三元杂交组合相比,本夏西F2较本夏利F_2生长发育迅速。  相似文献   

3.
夏海黄三元杂种牛生长发育研究   总被引：1，自引：1，他引：0  
测定分析了夏海黄三元杂交后代（公牛３４头，母牛３７头）与豫北黄牛及海黄Ｆ１初生－２４月龄体尺与体重均较豫北黄牛有较大幅度提高，较海黄Ｆ１提高明显，利用夏海黄三元杂交发展肉牛生产是一条有效途径。  相似文献   

4.
测定、分析了西海黄杂种手（公３６头、母３４头）初生至２４月龄体尺、体重生长发育情况，结果表明，西海黄杂种牛生长发育快，各月龄体尺、体重显著大于豫北黄牛，比海黄Ｆ１也有明显提高。  相似文献   

5.
肉牛三元杂交试验效果研究   总被引：2，自引：0，他引：2  
测定分析了四个三元杂交组合（皮西黄F1，♂9头，♀8头；利西黄F1，♂9头，♀8头；短西黄F1，♂7头，♀7头）与当地黄牛初生－18月龄体重和体尺及生长发育，结果表明：以三元杂交肉牛生长发育快，各月龄体重和体尺均较本地黄牛有较大幅度提高，其中以皮西黄牛表现最好，而短西黄牛发育较差。  相似文献   

6.
测定4种三元杂交组合(皮西黄F1,♂8头,♀8头;德西黄F1,♂9头,♀8头;利西黄F1,♂9头,♀8头;短西黄F1,♂7头,♀7头)与当地黄牛初生～18月龄体重和体尺生长发育。结果表明,三元杂交肉牛生长发育快,体重和体尺在各月龄下,均较本地黄牛有较大幅度提高。利用三元杂交进行肉牛生产是一条有效的途径。  相似文献   

7.
豫北黄牛及其杂交改良牛的生长发育研究   总被引：2，自引：2，他引：0  
通过测定分析了西利本杂交牛、利本F1杂交牛和豫北黄牛的初生－24月龄体尺、体重指标，结果表明，西利本三元杂交牛生产发育快，各月龄体尺、体重显著大于豫北黄,比利本F1也有显著提高。  相似文献   

8.
[目的]文章旨在对元江本地黄牛在不同饲养方式下的体重和体尺等性状进行分析,研究其生长发育规律并构建通过体尺预测体重的回归方程。[方法]研究随机选取规模牛场舍饲饲养的本地黄牛以及牛场周边农户放牧饲养的本地黄牛各20头、公母各10头,从初生到12月龄逐月测定体重体尺,并拟合适宜的生长发育模型、体重与体尺指标及月龄的回归模型。[结果]研究结果显示,(1)Gompertz、Logistic、Von Bertalanffy、Brody 4种模型拟合肉牛体重的拟合度R2均较高,其中以Logistic模型最优。本地放牧黄牛和舍饲黄牛公牛增长拐点月龄分别为4.75月、5.23月,拐点体重分别为70.23 kg、101.28 kg;(2)元江本地放牧及舍饲黄牛公母牛体重、体尺与月龄之间均呈极显著相关(P<0.01)。(3)元江本地黄牛放牧及舍饲公母两组牛体重、体尺与月龄之间均呈极显著相关(P<0.01),多元线性回归方程中,月龄的回归系数都大于其余性状的回归系数。[结论]元江本地黄牛体重生长曲线的拟合以Logistic模型最优;两组牛体重、体尺与月龄之间均呈极显著相关,...  相似文献   

9.
用南德温牛和德国黄牛（细管冻精）授配本地西门塔尔母牛,进行二元和三元杂交组合选种选配研究,分别测定其后代体尺、体重等主要生长发育指标,并经过各杂交组合间的比较,结果表明南本、德本、南德本组合犊牛初生、2月龄、4月龄、6月龄、12月龄体尺体重均高于本地牛和德南本组合,南德温作为父本对本地牛进行改良效果非常明显,可作为类似生态环境条件下肉牛二元、三元杂交的优选父本品种,在今后的本地牛改良中推广应用。  相似文献   

10.
为了测试四川本地黄牛改良牛(夏洛莱牛×西门塔尔牛×本地黄牛,夏西本三元杂交牛)的体尺性状和产肉性能,笔者选择了6头18月龄的夏西本三元杂交牛公牛进行体尺测量和屠宰性能测定。测定项目包括4部分,即体尺、屠宰、肉质性状和头蹄皮及内脏重量。结果表明,18月龄夏西本三元杂交牛具有良好的生长发育和屠宰性能,且具有较好的肉品质。综上所述,本试验展现了四川本地黄牛改良牛(夏西本三元杂交牛)的生产性能和特点,为合理保护、评价和利用四川地方黄牛品种提供了参考数据。  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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