Download or read book Genetic Evaluation of Brown Swiss Cattle in the United States written by Keith Gibson and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Genetic parameters were estimated for Brown Swiss dairy cattle using a population from the United States born in 2000 and later. The data set consisted of 108,633 first through fifth lactation records from 45,464 cows for yield, somatic cell score, days open, and productive life. Approximately half of the records also had observations for 18 linear type traits and 41,074 had observations for milking speed. Heritabilities and correlations amongst yield, fitness, and type traits were evaluated with 3-trait models in ASREML with fixed effects for lactation, age, and herd-calving cluster, and random effects for animal, permanent environment, and residual. The heritabilities of milk, fat, and protein yield were 0.30, 0.20, and 0.20, respectively. The heritabilities of productive life, days open, SCS, and milking speed were 0.11, 0.03, 0.12, and 0.26, respectively. Milk, fat, and protein yield had strong positive correlations with productive life (0.67 to 0.71), days open and SCS had strong negative correlations with productive life (-0.69 and -0.60, respectively), and milking speed had a positive correlation with productive life (0.26). All three yield traits were slightly unfavorably correlated with days open, but there was little relationship found between yield traits and SCS or milking speed. Correlations of body traits with yield and fitness traits tended to be small, though dairy form was positively correlated with yield (0.31 to 0.40) and negatively correlated with days open (0.36 to 0.67). Of the feet and leg traits, mobility was most favorably correlated with yield (0.26 to 0.27) and productive life (0.50). For udder traits, yield traits were positively correlated with rear udder height and rear udder width, ranging from 0.19 to 0.48, and negatively correlated with udder depth and fore udder attachment, ranging from -0.04 to -0.40. However, udder depth and fore udder attachment were more favorably correlated with SCS (-0.26 and -0.14, respectively) than rear udder height and rear udder width (-0.02 and 0.18, respectively). Productive life was most strongly correlated with fore udder attachment, rear udder width, udder depth, and rear udder height (0.44, 0.40, 0.35, and 0.33, respectively). Due to the importance of the relationship between udder traits with yield and fitness traits, an additional analysis was performed using the same data set to create an "udder efficiency" trait for Brown Swiss cows using Data Envelopment Analysis (DEA). The DEA assigned units, individual cows in this case, with an efficiency measure ranging from 0 to 1 based on their ability to minimize inputs and maximize outputs relative to other cows in the same herd. The sole input was the inverse of milking speed and the outputs were defined as milk, fat, and protein yield, and the inverse of somatic cell score. The most efficient cows would be those that milked quickly and produced large volumes of milk, fat, and protein with a low somatic cell score. The 40,960 udder efficiency records were derived and evaluated using 3-trait ASREML models as previously described. The heritability of udder efficiency was estimated to be 0.23 ± 0.0133. Genetic correlations with udder efficiency were positive and moderate for yield traits (0.40 to 0.42), favorable with SCS (-0.21), and strongly positive for milking speed (0.86). Udder efficiency was also strongly correlated with productive life (0.69). Of the udder traits, rear udder height (0.30), teat length (-0.28), fore udder attachment (0.25), and rear udder attachment (0.21) were most favorably correlated to udder efficiency. The correlation of udder depth with udder efficiency was 0.16. Based on these findings, DEA could be a useful and novel method for evaluating udder efficiency, helping to identify traits that enable selection for mastitis resistance without compromising yield. Results from the estimation of genetic parameters for U.S. Brown Swiss will allow for improved genetic selection for the breed.
Download or read book A Genetic History of the Brown Swiss Cattle in the United States written by Dorsa M. Yoder and published by . This book was released on 1935 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Analysis of Biological Data written by Michael C. Whitlock and published by Macmillan Higher Education. This book was released on 2019-11-22 with total page 2074 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Analysis of Biological Data provides students with a practical foundation of statistics for biology students. Every chapter has several biological or medical examples of key concepts, and each example is prefaced by a substantial description of the biological setting. The emphasis on real and interesting examples carries into the problem sets where students have dozens of practice problems based on real data. The third edition features over 200 new examples and problems. These include new calculation practice problems, which guide the student step by step through the methods, and a greater number of examples and topics come from medical and human health research. Every chapter has been carefully edited for even greater clarity and ease of use. All the data sets, R scripts for all worked examples in the book, as well as many other teaching resources, are available to qualified instructors (see below).
Download or read book Genetic Variance and Covariance Components for Across Population Evaluation of Brown Swiss Cattle written by and published by . This book was released on 2015 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Breeding of Dairy Cattle written by Julius Van der Werf and published by . This book was released on 2019 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Improvement of Dairy Cattle written by United States. Agricultural Research Service. Animal Husbandry Research Division and published by . This book was released on 1958 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Evaluation of U S Dairy Cattle in the Presence of Preferential Treatment written by Melvin Thomas Kuhn and published by . This book was released on 1998 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mixture model brought about only a small reduction in bias, but this reduction was achieved without any loss in mean true transmitting ability of the top 5% of cows. The shortcoming was the conditional probabilities of PT for PT records. Even in the best case, average probability was only .27. Utilizing the correct variance of residuals may be adequate to improve calculation of these conditional probabilities.
Download or read book The Brown Swiss Bulletin written by Brown Swiss Cattle Breeders' Association and published by . This book was released on 1923 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mason s World Encyclopedia of Livestock Breeds and Breeding 2 Volume Pack written by Valerie Porter and published by CABI. This book was released on 2016-03-09 with total page 1109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mason's World Encyclopedia of Livestock Breeds and Breeding describes breeds of livestock worldwide as well as a range of breed-related subjects such as husbandry, health and behaviour. This definitive and prestigious reference work presents easily accessible information on domestication (including wild ancestors and related species), genetics and breeding, livestock produce and markets, as well as breed conservation and the cultural and social aspects of livestock farming. Written by renowned livestock authorities, these volumes draw on the authors' lifelong interest and involvement in livestock breeds of the world, presenting a unique, comprehensive and fully cross-referenced guide to cattle, buffalo, horses, pigs, sheep, asses, goats, camelids, yak and other domesticants.
Download or read book Genomic Analysis of Male Fertility in Brown Swiss Cattle written by Hendyel Aparecida Pacheco and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigated bull fertility in Brown Swiss cattle. Chapter One offers an overview and an outline for the contents of the dissertation. Chapter Two provides a literature review on topics such as the importance of reproduction performance in dairy cattle, the importance of dairy bull fertility, and different genetic analyses. Chapter Three focuses on the evaluation of dairy bull fertility using confirmed pregnancy records. The analysis included both factors related to the bull under evaluation and factors associated with the cow that receives the unit of semen. The results showed that there is a substantial variation in conception rate among bulls, and the prediction of service sire fertility is feasible. These findings represent the foundation for the development of novel tools that will allow the dairy industry to make enhanced management and selection decisions on Brown Swiss male fertility. Chapter Four focuses on understanding the genetic basis of male fertility in Italian Brown Swiss dairy cattle. The analyses included whole-genome scans and gene-set analyses to identify genomic regions, individual genes, and genetic mechanisms affecting Brown Swiss bull fertility. These analyses identified genomic regions, individual genes, and gene-set related to male fertility. Additionally, the results showed genomic regions with marked non-additive effects associated with bull fertility. This comprehensive study contributes to a better understanding of the genetic basis of male fertility in cattle. Chapter Five aims to assess the feasibility of predicting male fertility in Brown Swiss cattle using genomic data under different scenarios, including within-country, across-country, and incorporating markers with large effect. The analyses included the use of linear kernel-based regression models fitting all SNPs or incorporating markers with large effect, using five-fold cross-validation. The findings showed that the prediction of service sire fertility using genomic data achieves moderate to high accuracy and the inclusion of markers with large effect is a promising alternative to the standard approach. However, the use of an across-country reference population did not outperform the standard within-country approach. Genomic predictions of service sire fertility can help Brown Swiss breeders make accurate genome-guided selection and management decisions. Chapter Six evaluates the presence of homozygosity in Italian Brown Swiss dairy cattle and assesses its association with bull fertility. The findings showed that inbreeding and increased homozygosity have a negative impact on male fertility in Italian Brown Swiss cattle. The quantification of homozygosity can contribute to minimizing the inbreeding rate and avoid its negative effect on fitness-related traits, such as male fertility. Lastly, a final Chapter is provided with some concluding remarks.
Download or read book Genetic Evaluation of Dairy Cattle by Multi trait Methodology and Comparison of 5 National Holstein Friesian Breed Strains for Economic Performance written by Joel Ira Weller and published by . This book was released on 1989 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Analysis of Fertility in Brown Swiss Dairy Cattle written by Francesco Tiezzi Mazzoni Della Stella Maestri and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rebhun s Diseases of Dairy Cattle E Book written by Thomas J. Divers and published by Elsevier Health Sciences. This book was released on 2007-11-13 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: REBHUN'S DISEASES OF DAIRY CATTLE, 2nd Edition is your all-in-one guide to bovine disease management. With thorough, up-to-date coverage of differential diagnosis methods, surgical and therapeutic treatment options, and prevention strategies, it provides vital information for battling bovine diseases in both dairy and non-dairy cattle. The book is organized by body system for quick, convenient reference, and this new edition meets the growing need for management of both diseases of individual cows and problems affecting whole herds. Individual case presentations provide a valuable tool for differential diagnosis. Practical overviews for procedures such as blood transfusion, abdominal paracentesis, and ECG give you reliable support for some of the most common procedures in bovine care. Body systems organization makes diagnosis easier and more effective by isolating system-specific diseases and conditions. Full-color design and over 200 new photographs depict disease processes in realistic clarity and ensure the most accurate diagnosis and treatment. Emphasis on herd health addresses the dairy industry's increased concern over population medicine. Expanded coverage of lameness highlights key problem areas in bovine feet. Revised drug usage recommendations and legal considerations present the most current information in these critical areas to help you prevent dangerous or costly errors. Additional public health/safety considerations identify diseases that pose a substantial public threat and detail special measures for related care of dairy cattle. New, innovative DVD features real-time videos of neurologic case studies, ultrasound and endoscopy procedures, and imaging techniques that familiarize you with the latest technological equipment and protocols. Features coverage of the latest treatment innovations including antibiotic residue testing, care of individual metabolic disease, troubleshooting, and much more.
Download or read book Report of Official Type Classifications of Brown Swiss Cattle written by Brown Swiss Cattle Breeders' Association of the United States of America, inc and published by . This book was released on 1956 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Evaluation of Age at First Calving Expectd Producing Ability and Breeding Efficiency in Sahiwal and Their Brown Swiss Crosses written by M. C. Khanna and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The cows born to brown swiss bulls had the lowest age at first ealving and expected producing ability. The cows born to sahiwal bulls had higher age at first calving and lower expected producing ability in contrast to cows born to brown swiss cross bread (F, F2 and 75%) bulls the breeding efficiency was lower in sahiwal as compared to the cows born to brown swiss and brown swiss crossbred bulls. THe heritability estimate in sahiwal for age at first calving and expected producing ability was moderately high indicating the possibility of bringing improvement in these traits by mass selection where as amongst the crossbred doughters born to brown swis and/or brown sahiwal crossbred bulls the heritabiility estimate of these two traits was either zer or of low magnitude. The phenotypic corrilation between age at first calving and breeding efficienus was positive but not significant in crossbred daughters born to brown swiss bulls but this trend appeared to be negative amongst the daughters born to sahiwal and the brown swiss sahiwal crossbred bulls.
Download or read book Animal Genomics written by Bhanu P. Chowdhary and published by S. Karger AG (Switzerland). This book was released on 2003 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication provides an update on the current status of gene maps in different livestock and pet/companion animal species. The findings summarized in species specific commentaries and original articles testify the rapid advances made in the field of animal genomics. Of significant interest is the fact that current investigations are providing headways for two important and exciting research fronts: targeted high-resolution mapping leading to the application of genomic information in addressing questions of economic and biological significance in animals, and the initiation of whole genome sequencing projects for some of the animal species. Like in humans and mice, this will set the stage for a new level of research and real time complex analysis of the genomes of these species. Animal Genomics signifies the beginning of a new era in this field and celebrates the achievements of the past 20 years of genomics research. It will be of special interest to researchers involved in genome analysis - both gross chromosomal as well as molecular - in various animal species, and to comparative and evolutionary geneticists.
Download or read book The Brown Swiss Bulletin written by Brown Swiss Cattle Breeders' Association of the United States of America and published by . This book was released on 1925 with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt:
