Gastrointestinal nematode infections of goats in a sub-tropical and humid zone of India   总被引：1，自引：0，他引：1  

A K Yadav  V Tandon 《Veterinary parasitology》1989,33(2):135-142

Twelve hundred and twenty-eight goats (Capra hircus L.) from a sub-tropical and humid zone of India were examined for gastrointestinal nematodes. The species encountered in the region were: Haemonchus contortus, Bunostomum trigonocephalum, Oesophagostomum columbianum, Trichuris globulosa, O. aspersum, and T. ovis. The overall infection rate was 86.8%. Among various species found, H. contortus emerged as the most prevalent, although B. trigonocephalum and O. columbianum were also significantly in evidence. The seasonal fluctuation in infection was assessed by monitoring the faecal egg count of 1638 goats slaughtered during the 1-year period. The maximum values for the prevalence and overall mean eggs g-1 of faeces (EPG) were observed after the heavy rainfall season and remained at a relatively high level from July to December. H. contortus and O. columbianum appear to be of major importance as parasites in the goats of this climatic zone; the role of climatic factors in their prevalence is discussed.  相似文献   

Community water management to intensify agricultural productivity in the polders of the coastal zone of Bangladesh     

Yadav  Sudhir  Mondal  Manoranjan K.  Shew  Aaron  Jagadish  S. V. Krishna  Khan  Zahirul Haque  Sutradhar  Asish  Bhandari  Humnath  Humphreys  Elizabeth  Bhattacharya  Jayanta  Parvin  Rokhsana  Rahman  Mahabubur  Chandna  Parvesh 《Paddy and Water Environment》2020,18(2):331-343

Paddy and Water Environment - Most of the lands of the southern coastal zone of Bangladesh are protected from tidal flooding and storm surges by embankments constructed during the 1960s and 1970s,...  相似文献   

Frequency and fertility restoration efficiency of Rf3 and Rf4 genes in Indian rice          下载免费PDF全文

Jawahar Lal Katara  Ram Lakhan Verma  Debkanta Nayak  Umakanta Ngangkham  Soham Ray  Hatanath Subudhi  Lambodar Behera  Sanghamitra Samantaray  Ravi Nageswara Rao  Onkar Nath Singh  Trilochan Mohapatra 《Plant Breeding》2017,136(1):74-82

Identification of new parental lines is crucial for developing ecology‐specific hybrids with ideal agronomic performance. We screened a total of 570 different ecology‐specific Indian rice varieties for the presence of fertility restorer genes, Rf3 and Rf4 using tightly linked markers DRRM Rf3‐10 and RM6100, respectively. Among these varieties, 13% carried Rf3Rf3/Rf4Rf4, 31% carried rf3rf3/rf4rf4, 6% carried Rf3Rf3/rf4rf4 and remaining 50% carried Rf4Rf4/rf3rf3 allelic combinations. A mini set of 40 varieties with variable allelic combinations of fertility restorer genes were testcrossed with WA and Kalinga‐based CMS lines. All the 80 F₁s were evaluated for spikelet fertility and fertility restoration ability. Rf3Rf3/rf4rf4 genotypes mostly behaved as partial maintainers or partial restorers. In contrast, rf3rf3/Rf4Rf4 genotypes were partial or effective restorers. However, double dominant genotypes showed better fertility restoration than the genotypes containing Rf3 or Rf4 individually. Some of the genotypes showed unexpected restoration pattern implying occurrence of other fertility restorer(s) apart from Rf3 and Rf4. The perfect restorers and maintainers identified in this study can be directly used in hybrid rice breeding.  相似文献   

Free-range system and supplementation of 25-hydroxicholecalciferol increases the performance and serum vitamin levels in mixed-parity sows     

Josiane C. Panisson  Nathália C. Oliveira  Cristina M. Sá-Fortes  Adsos A. Passos  Claudia C. da Silva  Wagner A. G. Araújo  Idael M. G. Lopes  Gleison M. S. Costa  Iara Q. Ataíde  Bruno A. N. Silva 《Animal Science Journal》2021,92(1):e13592

Improvements in sow productivity have raised questions regarding dietary vitamin D recommendations. The present study aimed to evaluate the effects of the housing system with access to sunlight exposure and supplementation of 25-hydroxicholecalciferol on performance and serum levels of 25(OH)D₃ in sows during gestation and lactation. Sows were distributed in an experimental design with two housing systems: gestation crates or gestation free-range system with external area for sunlight exposure; and two diets: 0 or 50 μg of 25-hydroxicholecalciferol kg⁻¹. The use of 25-hydroxicholecalciferol tended (P = 0.052) to improve total born and influenced (P = 0.046) on number of born alive. Litter weight at birth was also increased (P = 0.01) by 25-hydroxicholecalciferol supplementation; 25-hydroxicholecalciferol supplementation and housing system (free-range with sunlight exposure) tended to increase weaning weight (P = 0.07) and litter daily gain (P = 0.051) during lactation. Exposure to sunlight and 25-hydroxicholecalciferol supplementation increased 25(OH)D₃ serum levels when compared with control treatment during gestation (136.95 vs. 113.92 ng mL⁻¹; P = 0.035) and lactation (120.29 vs. 88.93 ng mL⁻¹; P = 0.026). In conclusion, the association of 25-hydroxicholecalciferol supplementation with exposure to sunlight during gestation improved significantly 25(OH)D₃ serum levels and consequently performance traits in gestation and lactation.  相似文献   

Identification of internal control genes in milk‐derived mammary epithelial cells during lactation cycle of Indian zebu cow          下载免费PDF全文

Pradeep Jatav  Monika Sodhi  Ankita Sharma  Sandeep Mann  Amit Kishore  Umesh K Shandilya  Ashok K Mohanty  Ranjit S Kataria  Poonam Yadav  Preeti Verma  Surinder Kumar  Dhruba Malakar  Manishi Mukesh 《Animal Science Journal》2016,87(3):344-353

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The development of the normal Schirmer tear test results during the dog's first year of life     

Manuella Oliveira Borges de Sampaio  Bret A. Moore  Nathália Mendonça de Seabra  Mariza Bortolini  Thayane Cristina Vieira  Camilla Bolmann Martins  Ana Leticia Groszewicz de Souza  Camila Marinelli Martins  Fabiano Montiani-Ferreira 《Veterinary ophthalmology》2023,26(3):184-190

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Contrasting edge and pasture matrix effects on ant diversity from fragmented landscapes across multiple spatial scales     

Lasmar  Chaim J.  Queiroz  Antônio C. M.  Rosa  Clarissa  Carvalho  Nathália S.  Schmidt  Fernando A.  Solar  Ricardo R. C.  Paolucci  Lucas N.  Cuissi  Rafael G.  Ribas  Carla R. 《Landscape Ecology》2021,36(9):2583-2597

Landscape Ecology - Harmful effects of habitat loss and fragmentation can be detected across multiple spatial scales, yet most studies that aim to characterize these effects take place at a single...  相似文献   

Cytology of tetraploid x hexaploid timothy (Phleum pratense L.)     

E. L. Nielsen  J. Nath 《Euphytica》1962,11(2):157-163

Ten pentaploids were isolated from seedling populations developed from seed of tetraploid plants grown in association with hexaploid timothy. About 80% of the prophase sporocytes exhibited severe or moderate pycnosis. These pycnotic accumulations appear to arrest the meiotic processes and apparently result in sporocyte lethality. Surviving sporocytes at diakinesis possessed nuclei with configurations that varied from 1 VI+14 II+1 I to 9 II+17 I. It is suggested that the conventional sorts of irregularities (univalents, inversions and translocations) cannot account for the low percentages of stainable pollen. Pairing relations indicated that considerable duplication and/or autosyndesis occurred in the genomes combined, and suggest that even though the tetraploid (2n=28) and hexaploid (2n=42) forms of Phleum pratense are closely related they are not identical. A portion of the sterility observed may be due to nuclear-cytoplasmic interaction.Results of co-operative work of the Crops Research Division, A.R.S., U.S. Department of Agriculture, and the Wisconsin Agricultural Experiment Station, Madison, Wis.Geneticist, Crops Research Division, A.R.S., U.S. Department of Agriculture, and Graduate Assistant, Department of Agronomy, Wisconsin Agricultural Experiment Station.  相似文献   

Differential Competitive Ability and Growth Habit of Pearl Millet and Clusterbean Cultivars in a Mixed Cropping System in the Arid Zone of India     

R. S. Yadav  O. P. Yadav 《Journal of Agronomy and Crop Science》2000,185(1):67-71

Dryland sustainable agriculture in the arid zone of India depends upon the choice of suitable cultivars for pure and mixed crop stands. Field experiments were conducted for two years to examine the response of two contrasting cultivars each of pearl millet (Pennisetum glaucum) and clusterbean (Cyamopsis tetragonoloba) in pure stands and in mixed pearl millet‐clusterbean stands. The differential response of cultivars of both crops to pure and mixed stands resulted in a significant genotype × cropping system interaction. Reduction in seed yield of both clusterbean cultivars was greater in mixed stands with tall and long duration pearl millet MH 179 than with medium statured and early maturing HHB 67. The degree of reduction was greater in Naveen, the branched clusterbean cultivar, than in RGC 197, the single stemmed cultivar. Mixing of pearl millet HHB 67 with medium duration clusterbean cultivar Naveen produced maximum pearl millet equivalent total yield. Higher land equivalent ratios (LERs) were also observed when clusterbean cultivars were mixed with early maturing and short statured pearl millet HHB 67.  相似文献   

Genetic diseases of sheep and goats   总被引：2，自引：0，他引：2  

P K Basrur  B R Yadav 《Veterinary Clinics of North America: Food Animal Practice》1990,6(3):779-802

Congenital malformations and inherited disorders constitute a substantial proportion of the afflictions seen in sheep and goats. Of these, malformations tend to be similar in both species, whereas the genetic diseases encountered to date, with the exception of a few, are different. Of the 28 genetic diseases of sheep and goats described in this review, 60% and 62.5%, respectively, are monogenic disorders. For a majority of the monogenic recessive disorders encountered in these species, the carrier state is not detectable at present, whereas in others, in which a biochemical lesion is known (dermatosparaxis, erythrocyte glutathione deficiency, globoid cell leukodystrophy and glycogen storage disease), the carrier state is detectable with the aid of enzyme and surface protein markers. The latter group and the dominant disorders (anury, cataract, glomerulonephritis, and lethal grey in sheep; gynecomastia and anotia-microtia complex in goats) are easy to eliminate through selective breeding. The polygenic disorders (entropion, epidermolysis bullosa, hereditary chondrodysplasia, and muscular dystrophy of sheep, and udder problems in goats) are more difficult to eradicate, because the mutant genes responsible for these traits generally do not declare themselves until inbreeding brings together a critical concentration to create a health crisis in some, whereas others, which are only short of a few of these mutant genes, might go totally unaffected and therefore undetected. Chromosome defects of the structural nature (translocations) seen in sheep and goats generally create meiotic disturbances, which in a majority of cases lead to subfertility, whereas sex chromosome aneuploids are generally sterile.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献