Studies on Genetic and Phenotypic Parameters of Some Economic Traits in Cattle and Buffaloes PDF Download
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Author: A. K. Shrivastava
Publisher:
ISBN:
Category :
Languages : en
Pages : 385
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Book Description
Author: A. K. Shrivastava
Publisher:
ISBN:
Category :
Languages : en
Pages : 385
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Book Description
Author: Siya Ram Singh
Publisher:
ISBN:
Category :
Languages : en
Pages : 327
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Author: Didar Singh
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The study was conducted to estimate genetic parameters of some of economic traits and construct pedigree and selection indices for buffaloes to construct sire indices for buffalo bulls based on milk yield and age at first calving to predict genetic gain in milk production per year from pedigree individual sib-testing and progeny testing selection and to estimate the economic returns and cost of selection and to compare the efficiencies of the different crieteria of selection in thre population sizes small medium and large. None of the genetic and phenotypic correlation between birth weight and other traits was significant. Age at first claving (AFC) had phenotypic correlation with WFC and FLMY and non significant correlation with FLL, FCI and BE. weight at first calving had positive phenotypic and genetic correlations of with FLMY. The correlation between individuals performance and its dams and sires indices were 0.23 and 0.993 respectively which indicated that selection of individual based on its dams yield was comparitively unreliable than that based on sires index. The expected breeding values indicated that the ranking of sires can be done either by taking FLMY alone or by considering AFC along with FLMY. The total genetic responses from progeny testing showed that as the population size increased the genetic response through all the given paths of genetic transmission as well as the total response increased. In case of half sib testing both BB(sire-bull) and BC (sire-cow) had the same genetic response. The total genetic response showed that at all levels of population. The responses obtained from progeny testing were the highest fallowed by that from half sibtesting. Gross returns per generation was highest in half sib testing fallowed by progeny testing. The in both small and medium populations the individual selection showed more monetary returns cost on semen was minimum in pedigree selection as compared to progeny and half sib testing. Genetic gain from the small sized population was quite low as compared to medium population and as the size of population genetic response increased half sib testing was most efficient in small population while progeny testing proved to be most efficient in medium and large populations.
Author: Dinesh Chandra Johari
Publisher:
ISBN:
Category :
Languages : en
Pages : 496
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Author: C. O. Reddy
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Investigations were carried out to study the relationship of profit function, life production and herd life with reproductive variables and to study the relationship between first lactation and lifetime performance and to estimate the economic returns on the basis of first lactation performance. The least square analysis showed that the differences between the two genetic groups (higher and lower crosses) were significant for all the production and profit traits. Similarly the genetic group did not show significant differences in reproductive raits viz., number of inseminations per conception (1.69 and 1.74), firsst calving interval (423 and 426 days), days open percent (36.66 and 37.13) and weight at first calving (306 and 384 kg). Based on profit per day of lif an open period of 135 days in higher crosses and 134 days in lower crosses were found to be satisfactory. The days dry were optimised at 34.22 percent 26.98 percent, 20.22 percent, 24.84 percent and 24.11 percent, for hrd life, lifetime milk yield, milk yield per day of herd life, lifetime profit and profit per day of herd life in higher crosse, respectively. It was also observed that, one standard deviation decrease in mean days dry percent could maximise all the lifetime production traits in lower crosses. Long herd life was found to be necessary for maximum profit and profit per day of herd life. The age at first calving accounted for little in all the lifetime traits in both higher and lower crosses (3.11 to 5.54 percent and 0.07 to 2.11 percent). Similar observations were made with the weight at first calving. Herd life increased gradually upto first lactation (2500 kg) in lower crosses and 3000 kg in higher crosses. Increase in first lactation increased the lifetime traits. The genetic correlations between first lactation traits and lifetime traits were higher in higher crosses. Th phenotypic corrlations among lifetime traits were positive and significant except the correlations of days dry percent with other lifetime traits.
Author: A. J. Sutton
Publisher: Wiley-Blackwell
ISBN:
Category : Mathematics
Languages : en
Pages : 360
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Book Description
Major text including chapters on the following: defining outcome measures; assessing heterogeneity; using fixed effects methods and random effects models for combining study estimates; publication bias.
Author: Antonio Minervino
Publisher: Frontiers Media SA
ISBN: 2889748693
Category : Medical
Languages : en
Pages : 293
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Book Description
Author: Aruna Pal
Publisher: Academic Press
ISBN: 0128172673
Category : Medical
Languages : en
Pages : 384
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Book Description
Genetics and Breeding for Disease Resistance of Livestock is a solid resource that combines important information on the underlying genetic causes and governing factors for disease resistance in food animals and applications for breeding purposes. It describes genomics at each species level to help researchers and students understand disease resistance and immunology using genomics and its application in breeding for disease resistance. This useful reference makes it easy for readers to understand and undergo further research in immunology and disease resistance for livestock. It includes novel applications and research material that is ideal for students, teachers, academicians and researchers. Presents basic principles and protocols to describe research methodologies through diagrammatic illustrations with figures, flow charts, examples, and references Covers various disease occurrences in livestock and the methodologies available to identify the various pathogens responsible for these diseases Includes advanced breeding techniques and practical applications
Author: Giorgio A. Presicce
Publisher: Bentham Science Publishers
ISBN: 1681084171
Category : Medical
Languages : en
Pages : 501
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Book Description
This handbook aims at focusing on the husbandry of the common water buffalo, (Bubalis bubalis). The book covers a broad range of topics such as the buffalo’s genetic evolution, cytogenetics, subspecies, breed diversification, feeding and metabolic specificity, adaptable response to environmental stress factors, welfare, dairy requirements and production, reproduction and embryo technologies, cryopreservation, sperm cell sexing, somatic cell cloning and transgenesis. Chapters presented and reviewed in this book have been by contributed by renowned scientists that have devoted years of research to the understanding of this species, and highlight the most recent advances in basic and applied science to unveil the understanding of physiological facets intrinsic to this animal species. The depth of the selected topics makes this book especially suited for readers of all academic levels of study. Researchers, students and professionals will find this book a useful guide to breeding and farming the water buffalo.
Author: Cedric Gondro
Publisher: Humana Press
ISBN: 9781627034463
Category : Science
Languages : en
Pages : 0
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Book Description
With the detailed genomic information that is now becoming available, we have a plethora of data that allows researchers to address questions in a variety of areas. Genome-wide association studies (GWAS) have become a vital approach to identify candidate regions associated with complex diseases in human medicine, production traits in agriculture, and variation in wild populations. Genomic prediction goes a step further, attempting to predict phenotypic variation in these traits from genomic information. Genome-Wide Association Studies and Genomic Prediction pulls together expert contributions to address this important area of study. The volume begins with a section covering the phenotypes of interest as well as design issues for GWAS, then moves on to discuss efficient computational methods to store and handle large datasets, quality control measures, phasing, haplotype inference, and imputation. Later chapters deal with statistical approaches to data analysis where the experimental objective is either to confirm the biology by identifying genomic regions associated to a trait or to use the data to make genomic predictions about a future phenotypic outcome (e.g. predict onset of disease). As part of the Methods in Molecular Biology series, chapters provide helpful, real-world implementation advice.
